CN118653812B

CN118653812B - Electric heating catalytic water thermal cracking exploitation method and system for heavy oil reservoir horizontal well

Info

Publication number: CN118653812B
Application number: CN202411132757.6A
Authority: CN
Inventors: 孙新革; 何万军; 罗池辉; 吴永彬; 高雨; 刘刚; 李鑫; 刘佳
Original assignee: Xinjiang Petroleum Administration Co ltd; Petrochina Co Ltd; China National Petroleum Corp
Current assignee: Xinjiang Petroleum Administration Co ltd; Petrochina Co Ltd; China National Petroleum Corp
Priority date: 2024-08-19
Filing date: 2024-08-19
Publication date: 2024-10-22
Anticipated expiration: 2044-08-19
Also published as: CN118653812A

Abstract

The present invention relates to the field of oil production technology, and is a method and system for producing heavy oil reservoir horizontal wells by electric heating catalytic hydrothermal cracking, which includes a well layout and completion module, an electric heating system design and construction module, a preparation module, a slug throughput production module, and a green electricity production module. Compared with the prior art, the present invention does not require a ground steam generator and a ground steam injection pipeline network, and only requires a horizontal well with a well inclination angle greater than 90° to effectively develop a heavy oil reservoir with a thin oil layer thickness; in the early stage, after high-temperature water vapor and nano-metal catalysts are mixed with crude oil, the aquathermal cracking reaction of the crude oil can be accelerated, the crude oil is upgraded, and the viscosity of the crude oil is irreversibly reduced, and finally the crude oil with reduced viscosity is discharged from the wellhead through circulating displacement fluid; in the later stage, in conjunction with green electricity, clean energy can be consumed on the spot, and heavy oil reservoirs can be developed and utilized to the greatest extent while low energy consumption, realizing the efficient development of thin oil layer heavy oil.

Description

Electric heating catalytic water thermal cracking exploitation method and system for heavy oil reservoir horizontal well

Technical Field

The invention relates to the technical field of petroleum exploitation, in particular to an electric heating catalytic water thermal cracking exploitation method and system for a heavy oil reservoir horizontal well.

Background

The thick oil resources in the world are rich, the common thick oil, the extra thick oil and the super thick oil (also called as asphaltene thick oil) account for about 70 percent of the total reserve of the world petroleum, and the geological reserve is far higher than that of the conventional crude oil. The thick oil is rich in high-boiling-point and high-viscosity compounds, so that the fluidity of the thick oil is poor, great difficulty is brought to thick oil exploitation, and the thick oil is difficult to exploit by adopting a conventional method.

At present, for a common heavy oil reservoir with the viscosity of the ground degassing crude oil at 50 ℃ being less than 20000 mPa.s, the common thermal recovery methods such as a Steam stimulation method (CSS), a Steam Flooding method (Steam Flooding), a hot water Flooding method (water Flooding method) or an in-situ combustion method (In Situ Combustion) and the like can be adopted for recovery. The steam huff and puff method is to inject high-temperature water steam into a shaft to heat an oil reservoir, and the method improves the fluidity of thickened oil, and comprises the following specific steps: quickly injecting high-temperature water vapor into an oil layer; braising, usually for 2-5 days; opening a well for production; when the oil recovery is severely reduced, the above steps are repeated. Steam flooding is a new way formed in the later stage of steam huff and puff, namely: high-temperature water vapor is continuously injected into the oil layer by the injection well, the displacement oil layer moves to a nearby production well, and the production well obtains continuous and higher yield. In-situ combustion is to inject combustion-supporting gas into an oil layer and ignite the oil layer, heat generated by combustion can heat the oil layer to reduce the viscosity of thick oil, and the injected gas also has the effect of increasing the energy of stratum to increase the yield; the combustion mode of in-situ combustion includes forward combustion, reverse combustion and combined thermal driving.

For extra heavy oil reservoirs with the viscosity of the ground degassing crude oil at 50 ℃ being more than 20000 mPa.s and the thickness of the continuous oil layer being more than 10m, the Steam Assisted Gravity Drainage (SAGD) mode can be adopted for exploitation. Steam Assisted Gravity Drainage (SAGD) is used as a thick oil thermal recovery technology with a comparison front edge, steam is used as a heat source for heating an oil layer to be injected into a stratum, crude oil in the stratum is heated to reduce viscosity, and thick oil recovery is carried out by utilizing vertical gravity difference generated by density difference.

The Chinese patent document with the publication number of CN110984936A discloses a preheating method for improving the SAGD exploitation efficiency of a single horizontal well, wherein the preheating process comprises the steam throughput of the single horizontal well for a plurality of times, namely the steam injection, the well stewing and the stoping processes of different steam injection parameters for a plurality of times; in the preheating process of steam throughput, the horizontal section adopts non-uniform perforation to ensure that the steam quantity of each section along Cheng Shekong is uniform; after the preheating process of steam huff and puff is finished, the temperature of the oil reservoir near the shaft in the oil reservoir can reach more than 75 ℃, and after the recovery quantity is gradually reduced to a certain low yield value, the continuous steam injection pipe in the single shaft is replaced. After the oil reservoir is preheated through steam huff and puff, the temperature of the oil reservoir can only reach 75-83 ℃, and the flowing capability of the super heavy oil is still poor under the temperature condition aiming at the super heavy oil reservoir with the crude oil viscosity of more than 50000mPa.s at 50 ℃, so that the preheating effect is very limited, and the oil-gas ratio is lower; the method needs casing completion and perforation operation, needs replacing steam injection pipes and changing perforation tracks during the later single horizontal well SAGD production, needs re-perforation, has high operation difficulty, requires the thickness of an oil layer to be 10 m-15 m, and cannot effectively use a thin oil layer below 10 m.

Chinese patent publication No. CN116291348a discloses a SAGD start-up method and system using electric heating assisted circulation steam injection, comprising: cleaning the steam injection well and the production well shaft of the screened SAGD well group, and saturating the steam injection well and the production well shaft with water; expanding reservoirs around a saturated water steam injection well and a production well shaft; heating the whole horizontal section of the expanded steam injection well and the production well to a first set temperature through the heating electrode, and stopping heating; injecting water with a second set temperature into the steam injection well and the production well through the long oil pipe, circularly replacing liquid for a first set time in a liquid discharge mode through the short oil pipe, and continuously injecting water with the second set temperature into the steam injection well and the production well according to the second set time through the long oil pipe after stopping discharging; judging whether the horizontal section wells of the screened SAGD well group are communicated or not, and determining whether to transfer to SAGD production or not according to a judging result. Two shafts of a gas injection well and a production well are required to be arranged, and the method is mainly used for oil reservoir double-horizontal well SAGD exploitation modes with continuous oil layers larger than 10m, reservoir expansion operation is required to be carried out before electric heating, hot water at 80 ℃ is required to be injected, and ground steam injection is still required to be carried out after SAGD production is carried out.

For super heavy oil reservoirs with the viscosity of the ground degassing crude oil at 50 ℃ being more than 50000 mPa.s and the thickness of a continuous oil layer being between 5 and 10m, particularly for super heavy oil reservoirs with thinner oil layer thickness, poorer transverse continuity of the oil layer, strong reservoir heterogeneity, quick physical property change and smaller final recoverable reserves (EUR) evaluated by a single well, the benefit development is extremely difficult to realize. However, the reserves of the oil reservoirs are large, and generally account for 30 to 40 percent of the total resource amount of the thick oil, the final recovery rate of exploitation by adopting a conventional thermal recovery method is generally less than 20 percent, the oil-gas ratio is generally less than 0.08, the unit carbon emission reaches more than 2.0 tons of carbon per ton of oil, the energy consumption is high, the carbon emission is high, and the oil recovery cost is high. For a strip-shaped super heavy oil reservoir with a thinner reservoir thickness, a smaller distribution width and a longer length, the conventional horizontal design cannot realize larger gravity drainage in one horizontal well.

Disclosure of Invention

The invention provides an electric heating catalytic hydrothermal cracking exploitation method and system for a heavy oil reservoir horizontal well, which overcome the defects of the prior art, and can effectively solve the problems of large heat loss at a steam injection end, high carbon emission and high need of matching a high-cost coal/gas boiler on the ground in the development process of the conventional banded super heavy oil reservoir with thinner oil reservoir thickness, smaller distribution width and longer length.

One of the technical schemes of the invention is realized by the following measures: an electric heating catalytic hydrothermal cracking exploitation method for a heavy oil reservoir horizontal well comprises the following steps:

Setting a horizontal well in a selected target oil reservoir, and putting a production oil pipe into the horizontal well after completion, wherein the well inclination angle of the horizontal well is greater than 90 degrees, and the horizontal section of the horizontal well is completed by adopting a screen pipe;

Designing and constructing an electric heating system, wherein the electric heating system comprises an underground electric heating device and a temperature monitoring device, and a continuous oil pipe with the underground electric heating device and the temperature monitoring device is lowered into the toe end of a horizontal well from a production oil pipe, wherein the underground electric heating device is positioned in the horizontal section of the horizontal well;

Preparing for oil recovery production, comprising: acquiring the total production wheel number M of the throughput production cycle of the electric heating nano metal catalyst slug and the clear water slug, and cleaning a shaft until drilling mud in the shaft is completely circulated to the ground;

Starting exploitation of M rounds of electric heating nano metal catalyst slugs and clear water slug throughput production periods, wherein each electric heating nano metal catalyst slug and clear water slug throughput production period comprises the following steps: sequentially injecting a nano metal catalyst dispersion liquid slug and a clear water slug into the horizontal well; starting an underground electric heating device, continuously heating the horizontal section of the horizontal well within a set time period through the mutual matching of the underground electric heating device and a temperature monitoring device, and catalyzing crude oil to generate a hydrothermal cracking reaction; after the hydrothermal cracking, the circulating fluid replacement production is carried out, whether the produced fluid is absent or whether the crude oil content in the produced fluid is less than 5% is judged, if so, the circulating fluid replacement production is ended, and if not, the circulating fluid replacement production is continued;

After the throughput production period of each electric heating nano metal catalyst slug and clear water slug is finished, determining the number N of exploitation wheels of the current throughput production period of the electric heating nano metal catalyst slug and clear water slug, judging whether N is more than or equal to M, if not, entering exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug of the next round, wherein the injection amount of the nano metal catalyst in the throughput production period of each new electric heating nano metal catalyst slug and clear water slug is increased by 20% compared with the throughput production period of the last electric heating nano metal catalyst slug and clear water slug, and the heating time of the downhole electric heating device in the throughput production period of each new electric heating nano metal catalyst slug and clear water slug is prolonged by 15% compared with the throughput production period of the last electric heating nano metal catalyst slug and clear water slug, if yes, ending exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug.

The following are further optimizations and/or improvements to the above-described inventive solution:

Above-mentioned open electric heater unit in pit, through electric heater unit in pit and temperature monitoring device mutually supporting in the setting duration to the continuous heating of horizontal section of horizontal well, catalytic crude oil takes place hydrothermal cracking reaction, can include: starting an underground electric heating device, wherein the underground electric heating device adopts full-power heating; the underground electric heating device judges whether the real-time shaft environment temperature acquired by the temperature monitoring device reaches a temperature threshold value; if so, the underground electric heating device is adjusted to be heated at a constant temperature, the catalytic crude oil is continuously subjected to the hydrothermal cracking reaction, whether the heating time of the underground electric heating device reaches the set time is judged, if so, the underground electric heating device is closed, and if not, the underground electric heating device is continuously heated at the constant temperature.

The preparing oil extraction production may further include: the reservoir fracture pressure is obtained to ensure that the bottom hole injection pressure of clean water is 0.5 MPa to 1MPa less than the reservoir fracture pressure each time a clean water slug is injected into the horizontal well.

The mass concentration of the nano metal catalyst dispersion liquid can be 0.05 to 2 percent, and the mineralization degree of clear water can be less than 200 mg/L.

The well inclination angle of the horizontal well can be 91 degrees to 95 degrees, and the distance between the horizontal section of the horizontal well and the bottom boundary of the oil layer can be 1m to 1.5 m.

The method can further comprise the step of starting exploitation of an intermittent heating production period by utilizing green electricity when the exploitation degree of the horizontal well reaches 25-30% after exploitation of the M rounds of electric heating nano metal catalyst slugs and clear water slugs in the throughput production period, wherein the intermittent heating production period comprises the following steps: after the green electricity is connected into the electric heating system, judging whether the green electricity supply quantity is matched with the heating power of the underground electric heating device; if so, injecting clear water into the horizontal well, starting an underground electric heating device, heating the clear water to produce high-dryness steam, and enabling the high-dryness steam to enter an oil reservoir to heat an oil layer; if not, the network electricity is connected into the electric heating system, whether the network electricity is in a valley electricity period is judged, if not, the well is closed, if yes, the electric heating system is enabled to maintain low-power heating through the network electricity, and gas lift oil extraction or self-injection production is started.

The second technical scheme of the invention is realized by the following measures: an electrically heated catalytic hydrothermal cracking exploitation system for a heavy oil reservoir horizontal well, comprising:

The well-laying and well-completion module is used for setting a horizontal well in a selected target oil reservoir, and a production oil pipe is arranged in the horizontal well after well completion, wherein the well inclination angle of the horizontal well is larger than 90 degrees, and a screen pipe is adopted for well completion of the horizontal section of the horizontal well;

The electric heating system design and construction module is used for designing and constructing an electric heating system, wherein the electric heating system comprises an underground electric heating device and a temperature monitoring device, and a continuous oil pipe with the underground electric heating device and the temperature monitoring device is lowered into the toe end of a horizontal well from the production oil pipe, and the underground electric heating device is positioned in the horizontal section of the horizontal well;

a preparation module for preparing oil recovery production, comprising: acquiring the total production wheel number M of the throughput production cycle of the electric heating nano metal catalyst slug and the clear water slug, and cleaning a shaft until drilling mud in the shaft is completely circulated to the ground;

the slug throughput exploitation module is used for starting exploitation of M rounds of electric heating nano metal catalyst slugs and clear water slug throughput production periods, and each electric heating nano metal catalyst slug and clear water slug throughput production period comprises the following steps: sequentially injecting a nano metal catalyst dispersion liquid slug and a clear water slug into the horizontal well; starting an underground electric heating device, continuously heating the horizontal section of the horizontal well within a set time period through the mutual matching of the underground electric heating device and a temperature monitoring device, and catalyzing crude oil to generate a hydrothermal cracking reaction; after the hydrothermal cracking, the circulating fluid replacement production is carried out, whether the produced fluid is absent or whether the crude oil content in the produced fluid is less than 5% is judged, if so, the circulating fluid replacement production is ended, and if not, the circulating fluid replacement production is continued; after the throughput production period of each electric heating nano metal catalyst slug and clear water slug is finished, determining the number N of exploitation wheels of the current throughput production period of the electric heating nano metal catalyst slug and clear water slug, judging whether N is more than or equal to M, if not, entering exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug of the next round, wherein the injection amount of the nano metal catalyst in the throughput production period of each new electric heating nano metal catalyst slug and clear water slug is increased by 20% compared with the throughput production period of the last electric heating nano metal catalyst slug and clear water slug, and the heating time of the downhole electric heating device in the throughput production period of each new electric heating nano metal catalyst slug and clear water slug is prolonged by 15% compared with the throughput production period of the last electric heating nano metal catalyst slug and clear water slug, if yes, ending exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug.

The following is a further optimization and/or improvement of the second technical scheme of the invention:

The method can further comprise a green electricity exploitation module, after exploitation of the M rounds of electric heating nano metal catalyst slugs and clear water slugs throughput production cycle, and when the level of the horizontal well exploitation reaches 25% to 30%, the exploitation of the green electricity-to-intermittent heating production cycle is started, wherein the intermittent heating production cycle comprises:

After the green electricity is connected into the electric heating system, judging whether the green electricity supply quantity is matched with the heating power of the underground electric heating device;

If so, injecting clear water into the horizontal well, starting an underground electric heating device, heating the clear water to produce high-dryness steam, and enabling the high-dryness steam to enter an oil reservoir to heat an oil layer;

If not, the network electricity is connected into the electric heating system, whether the network electricity is in a valley electricity period is judged, if not, the well is closed, if yes, the electric heating system is enabled to maintain low-power heating through the network electricity, and gas lift oil extraction or self-injection production is started.

Compared with the prior art, the invention can effectively develop heavy oil reservoirs with thinner oil layer thickness by only needing a horizontal well with a well bevel angle larger than 90 degrees without a ground steam generating device and a ground steam injection pipe network, can realize zero carbon emission and zero heat energy loss of an injection end, and can obviously improve the steam heat energy utilization rate. The nanometer metal catalyst-normal temperature clear water slugs of a plurality of production periods are adopted in the early stage, and the nanometer metal catalyst-normal temperature clear water slugs are matched with an electric heating system, so that high-dryness steam can be directly formed at the bottom of a well by electric heating, after the high-temperature steam, the nanometer metal catalyst and crude oil are mixed, the crude oil can be accelerated to generate a hydrothermal cracking reaction, light components and part of soluble gas of the crude oil generated by the hydrothermal cracking are dissolved into the crude oil, low-viscosity foam oil is generated, the crude oil is modified, the viscosity of the crude oil is reduced irreversibly, the crude oil with reduced viscosity can sink into a sieve tube under the action of gravity, and is converged at the bottom of a horizontal well, and finally, the crude oil is discharged out of a wellhead through circulating fluid replacement. The later stage is matched with green electricity, so that clean energy can be consumed in situ, a heavy oil reservoir can be developed and utilized to the greatest extent while the energy consumption is low, and the benefit development of thin oil layer heavy oil is realized.

Drawings

FIG. 1 is a schematic diagram of the horizontal well track and the tubular column structure according to embodiments 1-11 of the present invention.

Fig. 2 is a schematic diagram of an expanded configuration of a horizontal well steam cavity according to embodiments 1 to 11 of the present invention.

FIG. 3 is a flow chart of the electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well.

Fig. 4 is a flow chart of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput in the invention.

Fig. 5 is a flowchart of embodiment 2 of the present invention.

Fig. 6 is a flowchart of embodiment 6 of the present invention.

The codes in the drawings are respectively: the oil well pipeline comprises a screen pipe 1, a long oil pipe 2, a short oil pipe 3, a downhole electric heating device 4, a temperature monitoring device 5, a power supply cable 6, a steam cavity 7, a steam-liquid interface 8, an oil layer 9, an oil layer bottom boundary 10, an oil layer top boundary 11, a vertical section construction line 12, a horizontal section construction line 13, a crude oil extraction end 14 and a fluid injection end 15.

Detailed Description

The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.

In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention is further described below with reference to examples and figures:

example 1: as shown in fig. 1-5, the electric heating catalytic hydrothermal cracking exploitation method for the heavy oil reservoir horizontal well comprises the following steps:

S1, setting a horizontal well in a selected target oil reservoir, and lowering a production oil pipe into the horizontal well after completion;

wherein the well inclination angle of the horizontal well is larger than 90 degrees, and the horizontal section of the horizontal well is completed by adopting the screen pipe 1.

In the above technical solution, the reservoir parameters of the target reservoir may include: the thickness of a continuous oil layer in the oil reservoir is 5m to 10m; the oil reservoir is more than 50 to m away from the side water and the bottom water or has no influence of the side water and the bottom water; the horizontal permeability reaches more than 500 mD, and the vertical permeability is more than 300 mD; oil saturation is greater than 50%; the viscosity of the ground degassing crude oil at 50 ℃ is 20000mpa.s to 500000 mpa.s.

The oil reservoir is mainly selected because the heating effect is better in a horizontal well far away from bottom water and side water; the horizontal permeability reaches more than 500 mD, and the vertical permeability is more than 300 mD of the oil layer 9, which is more beneficial for the high-temperature vapor to penetrate through the oil layer and the vapor chamber 7 to develop.

In the use process, the drilling direction of a horizontal section (abbreviated as a horizontal section, the same applies hereinafter) of a horizontal well is obliquely crossed with a vertical section construction line 12 by combining oil reservoir parameters of a target oil reservoir, so that the well inclination angle alpha of the horizontal well is ensured to be larger than 90 degrees, the toe end (point B) of the horizontal section is obliquely tilted upwards relative to the heel end (point A), the drop between the point B and the point A can be manufactured in the oil reservoir 9 manually, and the larger the drop is in the oil extraction process, the larger the gravity displacement effect is, so that the gravity oil drainage mechanism can be fully exerted.

In addition, the fall between the AB points is generally larger by combining the well bevel angle alpha and the length of the horizontal section, so that liquid in the horizontal well is converged at the bottom of the horizontal well (the heel end of the horizontal well) under the action of gravity, a vapor-liquid interface 8 is formed at the bottom of the horizontal well, the vapor-liquid interface 8 can seal non-condensed gases such as CH ₄、CO₂ and the like generated by the hydrothermal cracking reaction of high-temperature steam and crude oil between the toe end of the horizontal well and the upper part of the vapor-liquid interface 8, heat dissipation is reduced, heat preservation of an oil layer 9 is facilitated, high-temperature steam can be effectively prevented from escaping to the well mouth or the high-temperature steam is prevented from being brought out of the well mouth by produced liquid, and heat energy loss is avoided, so that the heating efficiency of the downhole electric heating device 4 is greatly improved. The steam and the thick oil crude oil can be promoted to generate a hydrothermal cracking reaction at a high temperature, so that the steam cavity 7 at the position near the toe end of the horizontal section can develop faster, and the expansion of the steam cavity 7 to the heel end of the horizontal well can be accelerated.

S2, designing and constructing an electric heating system;

The electric heating system comprises a downhole electric heating device 4 and a temperature monitoring device 5, and a continuous oil pipe with the downhole electric heating device 4 and the temperature monitoring device 5 is lowered from the production oil pipe to the toe end of the horizontal well, wherein the downhole electric heating device 4 is positioned in the horizontal section of the horizontal well.

Through the technical scheme, the coal-fired/gas-fired boiler does not need to be arranged on the ground, the underground electric heating device 4 can be utilized to directly heat water liquid in a horizontal section shaft to produce high-temperature steam to catalyze crude oil to generate a hydrothermal cracking reaction, heat loss in a steam injection well process is effectively avoided, carbon emission is lower, safety and environmental protection are achieved, crude oil in a horizontal section near well oil layer can be directly heated, an oil drainage channel is established, and development of the steam cavity 7 is promoted. The temperature monitoring device 5 can monitor the ambient temperature of the horizontal section shaft in real time, and is more beneficial to adjusting the heating power of the underground electric heating device 4, so that the ambient temperature of the shaft of the horizontal section is always kept above the temperature at which the crude oil can undergo the hydrothermal cracking reaction.

According to the requirements, the temperature monitoring device 5 and the downhole electric heating device 4 can be encapsulated and installed in the same continuous oil pipe, and can also be encapsulated and installed in different continuous oil pipes respectively. In this embodiment, in order to enable the temperature monitoring device 5 to better monitor the ambient temperature of the well bore in the horizontal section, a long oil pipe and a short oil pipe may be provided, so that the downhole electric heating device 4 and the temperature monitoring device 5 are respectively encapsulated in different oil pipes after being separated. The long oil pipe 2 can be lowered to the toe end of the horizontal well, the upper end of the long oil pipe 2 is communicated with the fluid injection end 15 on the ground, a first continuous oil pipe can be lowered into the long oil pipe 2, a temperature monitoring device 5 is installed in the first continuous oil pipe in a filling and sealing mode, the temperature monitoring device 5 can resist the temperature of more than 350 ℃ for a long time, the temperature monitoring device 5 can be realized through a thermocouple or a temperature measuring optical fiber, and insulating filler between the temperature monitoring device 5 and the first continuous oil pipe can be magnesium oxide; the short oil pipe 3 can be arranged at the heel end of the horizontal well, the upper end of the short oil pipe 3 is communicated with the crude oil extraction end 14 on the ground, the second continuous oil pipe can be arranged in the short oil pipe 3, the second continuous oil pipe can be laid at the toe end of the horizontal well, the underground electric heating device 4 is packaged in the second continuous oil pipe, the underground electric heating device 4 can be an underground heating cable, a heating resistor, an electric heater or the like, the underground electric heating device 4 is electrically connected with the ground network through the power supply cable 6, and insulating filler between the underground electric heating device 4 and the second continuous oil pipe can be polytetrafluoroethylene or magnesium oxide.

In addition, the electric heating system can be matched with a ground control device and a fluid injection system, the underground electric heating device 4 and the temperature monitoring device 5 are respectively connected with the ground control device, the ground control device is the prior art in the technical field, the underground electric heating device 4 and the temperature monitoring device 5 can be mutually matched to continuously heat the horizontal section within a set duration, and the heating power of the underground electric heating device 4 can be regulated according to the real-time shaft environment temperature fed back by the temperature monitoring device 5; the fluid injection system is capable of injecting fluid into the well under control of the surface control system in accordance with the production process requirements of the present invention.

S3, preparing oil extraction production, comprising: and (3) acquiring the total production wheel number M of the production cycle of the electric heating nano metal catalyst slug and the clear water slug, and cleaning the shaft until the drilling mud in the shaft is completely circulated to the ground.

In the above technical solution, the method for obtaining the total mining wheel number M of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug is the prior art in the technical field, and in this implementation, the total mining wheel number M of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug, that is, the cycle mining times of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug, can be determined by using a fine three-dimensional geological model through a numerical simulation method.

During the use, through the washing pit shaft, wash well drilling mud, mud cake in the pit shaft, just can make the slug fluid evenly fill the pit shaft, avoid remaining drilling fluid to change the concentration and the composition of slug fluid simultaneously to be favorable to follow-up crude oil hydrothermal cracking reaction.

S4, starting exploitation of the production cycle of M rounds of electric heating nano metal catalyst slugs and clear water slugs;

each of the electrical heating nano metal catalyst slugs and clear water slug throughput production cycles includes:

s41, injecting a nano metal catalyst dispersion liquid slug into the horizontal well.

In the above technical scheme, the nano metal catalyst needs to enter the oil layer 9 together with the diffusion liquid to exert the effect, and the original state of the thick oil layer 9 belongs to the solid asphalt structure, so that the nano metal catalyst cannot be directly injected into the thick oil layer 9 in a large amount. Therefore, a small amount of slugs are used for injecting the nano metal catalyst, so that the nano metal catalyst can better contact with crude oil to catalyze the crude oil to be modified. The nano metal catalyst is selected in the embodiment, mainly because compared with other catalysts, the nano metal catalyst has high viscosity reduction efficiency, can be fully mixed and contacted with both water phase and oil phase, and has high catalytic reaction efficiency under high specific surface area.

S42, injecting clear water slugs into the horizontal well.

During the use process, the nano catalyst can be replaced by injecting the clear water slug into the oil layer 9, and meanwhile, the periphery of the horizontal section shaft is filled with clear water. The high-temperature steam generated by heating clear water by the underground electric heating device 4 can be used as a hydrogen supply agent, and after the high-temperature steam is repeatedly contacted with crude oil, the hydrothermal cracking reaction of the crude oil can be promoted, namely, the reactions of hydrogenation, ring opening, desulfurization, denitrification, water gas conversion and the like of thick oil under the action of the high-temperature steam can be promoted. In addition, in the high-temperature steam diffusion process, the nano metal catalyst enters the crude oil along with the high-temperature steam, so that the hydrothermal cracking reaction between the crude oil and the high-temperature steam can be catalyzed and accelerated.

According to the requirements, other hydrogen supplying agents can be added in the clear water slug process for better aquathermolysis reaction of crude oil, and the hydrogen supplying agents can be selected from hydrogen supplying agents known in the technical field. The clean water can be low-mineralization clean water, and the low-mineralization clean water can effectively prevent mineralization matters in the clean water from generating a large amount of scale on the surface of the underground electric heating device 4, so that the heating efficiency and the service life of the underground electric heating device 4 are prevented from being influenced.

S43, starting the underground electric heating device 4, continuously heating the horizontal section of the horizontal well within a set period of time through the mutual cooperation of the underground electric heating device 4 and the temperature monitoring device 5, and catalyzing the crude oil to generate a hydrothermal cracking reaction.

In the use process, the underground electric heating device 4 can continuously heat water liquid in a shaft within a set period of time, can continuously heat a near-well oil layer to reduce the viscosity of crude oil besides producing high-temperature water vapor for the crude oil to generate a hydrothermal cracking reaction, can simultaneously heat condensed water in a near-well stratum to generate additional steam to supplement heat to the steam cavity 7, and CH ₄ generated in the crude oil hydrothermal cracking reaction can also be used as an organic hydrogen donor to accelerate the hydrothermal cracking reaction of the crude oil and the crude oil to upgrade.

In the process of crude oil aquathermolysis reaction, after non-condensable gases such as CH ₄、CO₂ and the like generated by the crude oil aquathermolysis reaction and crude oil light components such as light hydrocarbons and the like are transported to the top of the steam cavity 7, the crude oil light components and part of soluble gases can be dissolved into crude oil to generate low-viscosity foam oil, the modification of the crude oil is accelerated, the viscosity of the crude oil is irreversibly reduced, and the crude oil after viscosity reduction is sunk into the screen pipe 1 under the action of gravity to be converged towards the bottom of the horizontal well (namely the heel end of the horizontal well). After the crude oil flowing to the bottom of the well contacts with the high-temperature water gathered at the bottom of the horizontal well, the high-temperature thermal cracking reaction can be continued to occur, more crude oil light components are decomposed, and the steam cavity 7 is further enlarged. The expansion of the steam cavity 7 can accelerate the hydrothermal cracking reaction between the crude oil and the high-temperature steam, thereby improving the yield of the crude oil.

S44, recycling liquid replacement production after hydrothermal cracking.

In the production process of the slug huff and puff, along with continuous heating of the downhole electric heating device 4 for a long time, the crude oil and the high-temperature steam can continuously undergo a hydrothermal cracking reaction, and after a period of time, high-temperature crude oil with high saturation is filled in a horizontal section shaft and a near-well reservoir, the downhole electric heating device 4 is difficult to continuously heat or can not effectively expand the heating radius, and invalid heating occurs. At this time, a displacement medium can be injected into the horizontal well, and high-temperature crude oil is extracted through circulating displacement fluid (the oil extraction device can also be used for extraction). After the crude oil is extracted, a large low-pressure cavity is formed underground due to the existence of the gas-liquid interface 8, so that the more the high-temperature crude oil is extracted, the more the slug fluid injection in the next round of the production cycle of the electric heating nano metal catalyst slug and the clear water slug is facilitated, and the larger the slug fluid injection amount is, the more the contact area between the slug fluid and the crude oil is facilitated to be enlarged.

According to the requirements, the circulating liquid replacing production can comprise the following steps: the displacement medium is injected from the annular space of the production oil pipe and the continuous oil pipe, the produced liquid is discharged from the annular space of the oil sleeve, wherein the displacement medium can be N ₂、CH₄ or clear water or a mixture consisting of any two media of N ₂、CH₄ and clear water, the mineralization degree of the displacement medium is not more than 200mg/L, and the temperature is less than 100 ℃. Clear water with a mineralization degree of not more than 200mg/L and a temperature of less than 100 ℃ can be selected in the embodiment, so as to reduce the deposition of minerals in the shaft and the influence on the environmental temperature of the steam cavity 7.

S45, judging whether no produced liquid exists or whether the crude oil content in the produced liquid is less than 5% after the circulating liquid is produced.

S46, if so, ending the circulating fluid replacement production, and if not, continuing the circulating fluid replacement production.

In the technical scheme, in the cyclic liquid replacement process, when no liquid is produced or the crude oil content in the produced liquid is less than 5%, the modified crude oil generated by the heating catalytic cracking in the production period of the round of electric heating nano metal catalyst slugs and clear water slugs is completely or basically completely exploited, and the benefit of continuous exploitation is not achieved. At this time, a new cycle of exploitation of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug is required, so that more crude oil is subjected to a hydrothermal cracking reaction, and the benefits of heavy oil exploitation can be maintained after modifying and viscosity reducing.

S5, after the throughput production period of each electric heating nano metal catalyst slug and clear water slug is finished, determining the number N of exploitation wheels in the current throughput production period of the electric heating nano metal catalyst slug and clear water slug, and judging whether N is more than or equal to M.

When the step S4 is circularly executed, whether the exploitation of all the electric heating nano metal catalyst slugs and clear water slug throughput production periods is completed according to the preset total exploitation wheel number M can be determined by judging whether the exploitation wheel number N of the current electric heating nano metal catalyst slugs and clear water slug throughput production periods is greater than or equal to the total exploitation wheel number M of the electric heating nano metal catalyst slugs and clear water slug throughput production periods.

S6, if not, the next round of exploitation of the production cycle of the electric heating nano metal catalyst slug and the clear water slug is entered, the injection quantity of the nano metal catalyst in each new electric heating nano metal catalyst slug and the clear water slug is increased by 20% compared with the production cycle of the previous electric heating nano metal catalyst slug and the clear water slug, and the heating time of the downhole electric heating device 4 in each new electric heating nano metal catalyst slug and the clear water slug is prolonged by 15% compared with the production cycle of the previous electric heating nano metal catalyst slug and the clear water slug.

In the use process, as only crude oil in a small range of a horizontal section near a well can undergo a hydrothermal cracking reaction in the exploitation process of each round of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug, the exploitation process of at least four rounds of the throughput production cycle of the electrically heated nano metal catalyst slug and the clear water slug is usually required to be repeatedly executed, so that the steam cavity 7 can gradually expand and develop towards the heel end of the horizontal well (as shown in fig. 2). In the production process, the stability of the subsequent crude oil production can be ensured only if the steam cavity 7 is formed into a certain scale, and benefit development is realized.

In the circulation process of the throughput production cycle of the electric heating nano metal catalyst slug and the clear water slug, the steam cavity 7 is expanded round by round, so that after the electric heating nano metal catalyst slug and the clear water slug are exploited in the throughput production cycle of a new round, more nano metal catalyst and clear water are injected each time, heating time is prolonged, water and surrounding reservoirs can be fully heated, enough high-temperature steam is generated, and accordingly the high-temperature steam and crude oil in the reservoir with a larger area nearby the steam cavity 7 fully generate a hydrothermal cracking reaction under the action of enough catalyst, more crude oil is upgraded and reduced in viscosity, development of the steam cavity 7 is improved, and recovery ratio of a target oil reservoir is effectively improved.

According to the invention, the single horizontal well with the drop height is manufactured manually in the oil layer 9, and deep thick oil is extracted in a mode of gravity drainage assisted by high-temperature steam and nano metal catalyst, so that the yield of an oil well is improved, and the final recovery ratio is also improved.

And S7, if so, ending the exploitation of the production cycle of the electric heating nano metal catalyst slug and the clear water slug.

Compared with the prior art, the invention can effectively develop the heavy oil reservoir with thinner reservoir thickness by only needing a horizontal well with the well oblique angle alpha larger than 90 degrees, and can realize zero carbon emission and zero heat energy loss at the injection end without a ground steam generating device and a ground steam injection pipe network, thereby obviously improving the steam heat energy utilization rate. The early stage of the production process of electric heating hydrothermal catalytic cracking is performed in a circulating way, so that high-temperature steam, a nano metal catalyst and crude oil are fully mixed, the crude oil can be accelerated to undergo a hydrothermal cracking reaction, light components and part of soluble gas of the crude oil generated by the hydrothermal cracking are dissolved into the crude oil to generate low-viscosity foam oil, the crude oil is modified, the viscosity of the crude oil is irreversibly reduced, the crude oil with reduced viscosity can sink into a sieve tube 1 under the action of gravity, and the crude oil is converged at the bottom of a horizontal well and finally discharged out of a wellhead through circulating fluid replacement.

The electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well can be further optimized or/and improved according to actual needs:

example 2: as shown in fig. 1-5, the step S43: starting the underground electric heating device 4, continuously heating the horizontal section of the horizontal well within a set time period through the mutual matching of the underground electric heating device 4 and the temperature monitoring device 5, catalyzing crude oil to generate a hydrothermal cracking reaction, and comprising the following steps:

S431, the downhole electric heating device 4 is turned on, and the downhole electric heating device 4 adopts full-power heating.

In the use process, the underground electric heating device 4 works at full power, and can rapidly heat water in a shaft, so that the shaft environment temperature of the horizontal section reaches the temperature threshold value of the crude oil for hydrothermal cracking reaction.

S432, the downhole electric heating device 4 judges whether the real-time shaft environment temperature acquired by the temperature monitoring device 5 reaches a temperature threshold value.

In the use process, if the real-time ambient temperature of the shaft does not reach the temperature threshold value, the downhole electric heating device 4 can continue to heat with full power until the ambient temperature in the shaft of the horizontal section reaches the threshold temperature value.

According to the requirement, the temperature range suitable for the crude oil thermal cracking reaction is 280 ℃ to 350 ℃, so the temperature threshold value in the embodiment can be any temperature value within the temperature range of 280 ℃ to 350 ℃, and the upper limit of the shaft temperature of each production period can be gradually close to 350 ℃ under the condition of eliminating the coking risk of crude oil.

And S433, if yes, adjusting the underground electric heating device 4 to be heated at constant temperature, and continuously catalyzing the crude oil to perform the hydrothermal cracking reaction.

In the above technical solution, if the real-time wellbore environmental temperature in the horizontal well does not reach the temperature threshold value, the downhole electric heating device 4 continues to adopt full-power heating.

S434, it is determined whether the heating duration of the downhole electric heating device 4 has reached the set duration.

In the constant temperature heating process, the ambient temperature of the shaft is required to be kept in a temperature range suitable for the hydrothermal cracking reaction, so that the crude oil can continuously undergo the hydrothermal cracking reaction under the action of the nano metal catalyst, further more crude oil is modified and viscosity is reduced, and the heating and cracking process of the downhole electric heating device 4 is usually required to be maintained for 15 days to 45 days. When the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput is implemented for the first time, the heating set time length of the downhole electric heating device 4 can be set according to actual needs, for example, the heating set time length is selected from 15 days to 45 days.

S435, if yes, turning off the downhole electric heating device 4;

If not, the downhole electric heating device 4 continues to heat at constant temperature.

In the process of circulating liquid replacement, heating is not needed, and the underground electric heating device 4 is closed, so that energy is effectively saved, and the exploitation cost is saved.

Example 3: the preparing for oil recovery production further comprises: and (3) acquiring the fracture pressure of the oil layer, and ensuring that the bottom hole injection pressure of clean water is 0.5 MPa-1 MPa smaller than the fracture pressure of the oil layer when the clean water slug is injected into the horizontal well each time.

Through the arrangement, in the clean water slug process, the clean water pressure can be effectively prevented from being larger than the oil layer rupture pressure, the boundary of the oil layer is fractured, the sealing state of the oil layer 9 is destroyed, and the follow-up cyclic implementation of the production cycle of the electric heating nano metal catalyst slug and the clean water slug throughput is affected.

In the above technical solution, the method for obtaining the fracture pressure of the oil layer is a known method in the art, and in this embodiment, the measurement of the fracture pressure of the oil layer can be achieved by the following method: and (3) coring in a target oil reservoir in a closed manner, selecting a plurality of typical samples, carrying out an indoor rock stress experiment, and determining the minimum fracture pressure of the target oil reservoir through experimental analysis.

Example 4: the mass concentration of the nano metal catalyst dispersion liquid is 0.05-2%, and the mineralization degree of clear water is less than 200 mg/L.

According to the requirements, the nano metal catalyst comprises, but is not limited to, a catalyst containing Ni, mo, fe, cu, V or other transition metal salts, organic compounds of transition metals or water-soluble salts, and nano copper is preferably used as the catalyst in the embodiment, and the mass fraction of the nano copper is 0.35 to 0.5 percent.

Example 5: as shown in fig. 1-2, the horizontal well has a well inclination angle of 91 ° to 95 °, and the distance between the horizontal section of the horizontal well and the reservoir bottom 10 is 1m to 1.5 m.

In the use process, the invention is generally suitable for the heavy oil reservoir of the oil layer 9 with the oil layer thickness of 5 m-10 m, and at the moment, the well inclination angle of 91-95 degrees can enable the toe end of the horizontal well to tilt upwards compared with the heel end, so that enough drop is manufactured manually between the top boundary 11 of the oil layer 9 and the bottom boundary 10 of the oil layer, the gravity oil drainage mechanism is fully exerted, the construction difficulty of the horizontal well is avoided, and the design and manufacturing cost of the horizontal well is saved.

The distance between the horizontal section of the horizontal well and the oil layer bottom boundary 10 can be kept between 1m and 1.5 m, so that the oil layer bottom boundary 10 is prevented from being burst due to sudden heating or uneven heating in the electric heating process, and the closed state of the steam cavity 7 is prevented from being damaged.

Example 6: 1-3 and 6, S8, after the M rounds of electric heating nanometer metal catalyst slugs and clear water slugs are produced in the throughput production period, and when the production degree of the horizontal well reaches 25% to 30%, starting the production of the intermittent heating production period by using the green electricity, wherein the intermittent heating production period comprises the following steps:

In the technical scheme S8, when the extraction degree of the horizontal well reaches 25% to 30%, it is indicated that the steam cavity 7 has been basically developed and completed, the reservoir around the horizontal section shaft is further and further away from the heat radiation area of the downhole electric heating device 4, the downhole electric heating device 4 is difficult to heat the crude oil rapidly and efficiently, the reaction efficiency of the crude oil hydrothermal cracking reaction is lower and lower, the exploitation cost is higher and the exploitation benefit is worse, but the target oil reservoir still has a larger exploitation value.

At this time, the technical scheme S8 provides a method capable of continuously exploiting the target oil reservoir by using green electricity, and since the green electrode is easily restricted by environmental factors, the downhole electric heating device 4 can only intermittently supply power, so that the target oil reservoir can be exploited by intermittent heating. According to the requirements, in order to save exploitation cost and reduce exploitation energy consumption, green electricity is used as a main power supply, grid electricity can be used as a standby power supply, the green electricity can be photovoltaic power supply, wind power generation or wind-light combined power supply and the like, photovoltaic power generation can be optimized in the embodiment, and automatic allocation can be realized between the photovoltaic power supply and the grid electricity through a ground control device.

And S81, after the green electricity is connected into the electric heating system, judging whether the green electricity supply quantity is matched with the heating power of the underground electric heating device 4.

In the use, the generated energy of photovoltaic power generation can receive the influence of illumination intensity, and when illumination is sufficient in daytime, photovoltaic power generation can normally supply power, and illumination intensity is serious not enough at night, and photovoltaic power generation stops supplying power. Therefore, when the power supply amount of the photovoltaic power generation is matched with the heating power of the underground electric heating device 4, the photovoltaic power generation can be utilized to continuously heat the shaft environment, namely, the underground electric heating device 4 can be normally started by the power supply amount of the photovoltaic power generation, and the horizontal section of the horizontal well can be continuously heated; when the power supply amount of the photovoltaic power generation device is insufficient to maintain the normal heating operation of the downhole electric heating device 4, the downhole electric heating device 4 is turned off.

According to the requirement, the underground electric heating device 4 in the electric heating system has the greatest working power and consumes the most energy, so that the green electricity is mainly used for supplying power to the underground electric heating device 4, but when the green electricity generating capacity is sufficient, the whole electric heating system can be supplied with power through the green electricity.

S82, if so, injecting clean water into the horizontal well, starting the underground electric heating device 4, heating the clean water to produce high-dryness steam, and enabling the high-dryness steam to enter the oil reservoir to heat the oil layer 9.

In the use process, the underground electric heating device 4 is driven by green electricity to heat clear water in a horizontal section shaft, high-dryness steam is produced, the oil layer 9 is continuously heated by the high-dryness steam, the fluidity of crude oil is improved, the high-dryness steam and the crude oil can still undergo a hydrothermal cracking reaction under the action of high temperature, the crude oil is modified and reduced in viscosity, the crude oil after viscosity reduction can flow to the gas-liquid interface 8 or sink to the bottom of the horizontal shaft under the action of gravity, and the crude oil is converged below the gas-liquid interface 8.

According to the requirements, the steam with high dryness is usually steam with dryness of more than 70%, and the steam with dryness of more than 80% can be used in the embodiment.

And S83, if not, electrically connecting the network into the electric heating system.

In the use process, the grid electricity can be used as a standby heating power supply, and because the electricity prices of different time intervals of the grid electricity are greatly different, the valley electricity price of the early morning time interval is the lowest electricity price in one day generally, so that in order to reduce the oil extraction cost, the starting time and the starting power of the underground electric heating device 4 are required to be determined according to the peak-valley time interval of the grid electricity.

S84, judging whether the network power is in the valley period.

S85, if not, closing the well and then soaking the well.

And S86, if yes, maintaining low-power heating of the electric heating system through grid electricity, and starting gas lift oil extraction or self-injection production.

According to the technical scheme, on the basis of utilizing the characteristics of sustainable resources such as solar energy and the like, peak-valley difference of network electricity is comprehensively considered, and cheap electric energy in a valley electricity period is used for maintaining low-temperature heating operation of the underground electric heating device 4 so as to avoid damaging the underground electric heating device 4 due to rapid thermal expansion and contraction. In the oil extraction process, the green electricity and the net electricity are cooperated to realize low-energy oil extraction, so that the heavy oil reservoir can be developed and utilized to the greatest extent.

In the exploitation process, when the network electricity is in the evening non-valley period, the peak electricity price is usually just in the highest position in one day, and the photovoltaic power supply device just stops supplying power at the moment, the photovoltaic power supply underground electric heating device 4 is used for normally heating for a whole day in the daytime, the temperature in the horizontal well is still in a peak value state, the well is shut down and the well is stewed in this stage, latent heat carried by high-temperature steam can be more effectively transferred to an oil reservoir, crude oil can be continuously heated, a hydro-thermal cracking reaction occurs, the quality and viscosity are continuously improved, heating energy consumption is saved, and exploitation cost is reduced. The time of the well stewing can be 2 to 4 hours before the valley electricity in the early morning according to the requirements.

When the network electricity enters the early morning valley electricity period, the well is opened to start self-injection production or gas lift oil extraction, modified crude oil generated in the daytime is extracted to the bottom of the well, the underground electric heating device 4 is started again, and the underground electric heating device 4 is kept in low-power operation so as to prevent the underground environment temperature from dropping sharply in the oil extraction process. In this embodiment, the gas lift oil recovery may be N ₂ or CH ₄ lift oil recovery.

The implementation process of the electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well is described in three specific embodiments.

Example 7: as shown in fig. 1-6, the embodiment provides a horizontal well electric heating catalytic hydrothermal cracking exploitation method for a target oil reservoir, which specifically includes the following steps:

(1) Selecting heavy oil reservoirs with proper reservoir parameters: the case of the target reservoir one is as follows:

① The middle part of the target oil layer 9 of the oil reservoir is buried with 280 m, a horizontal well is implemented, the oil layer 9 of the horizontal section of the well is a sand layer, the inner permeability level difference is 7, the thickness of the continuous oil layer reaches 8m, and the oil reservoir has no side water and no bottom water;

② The horizontal permeability is 1000 mD, and the vertical permeability is 650 mD;

③ The viscosity of the crude oil at 50 ℃ is 20000 mpa.s;

④ The oil reservoir is not developed, no fault exists around the horizontal well, and the oil reservoir belongs to a monoclinic angle of 2-8 degrees as a whole, so that the exploitation conditions of electric heating catalytic hydrothermal cracking exploitation of the horizontal well provided by the invention are met.

(2) Obtaining the fracture pressure of the oil layer: and (3) performing closed coring in a target oil reservoir I, selecting 4 typical samples, carrying out an indoor rock stress experiment, and determining that the minimum fracture pressure of an oil layer 9 of the oil reservoir is 6.8 MPa through experimental analysis.

(3) Optimizing well distribution and drilling design: determining that a horizontal well deployment area is free of faults, wherein the length of a horizontal section is 400 m; five sections of track are adopted, namely a straight well section, an inclination increasing section, an inclination stabilizing section, an inclination increasing section and an inclination stabilizing section, and the horizontal section drills at an inclination angle of 91 degrees along the inclined direction of a vertical section construction line 12 of the horizontal well at a position which is 10 meters to one point and five meters away from the bottom boundary of an oil layer, so that the toe end of the horizontal well is about 7 m higher than the heel end of the horizontal well.

(4) Optimizing the structural design of a well completion and a tubular column and designing and constructing an electric heating system: the horizontal section adopts a screen pipe 1 to complete the well, a long oil pipe 2 and a short oil pipe 3 are arranged in the horizontal well after completion, wherein the long oil pipe 2 is arranged at the toe end of the horizontal well, a first continuous oil pipe is arranged in the long oil pipe 2, a temperature monitoring device 5 is arranged in the first continuous oil pipe in a sealing manner, and 8 temperature measuring points can be arranged at even intervals along the axial direction of the horizontal section of the horizontal well in the temperature monitoring device 5; the short oil pipe 3 is put into the heel end of the horizontal well, the second continuous oil pipe which can be laid into the toe end of the horizontal well is put into the short oil pipe 3, the underground electric heating device 4 is packaged in the second continuous oil pipe through mineral insulating materials, and the power density of the underground electric heating device 4 is 2 kW/m.

(5) Preparing oil extraction production: determining the total mining wheel number of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput to be 6 wheels by using a fine three-dimensional geological model through a numerical simulation method; cleaning a shaft, injecting clear water or softened water from an annular space between the long oil pipe 2 and the first continuous oil pipe, draining the annular space between the short oil pipe 3 and the second continuous oil pipe for 5 days until the shaft is cleaned.

(6) Injecting nano metal catalyst slugs: in the first round of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput, 3 tons of nano copper catalyst dispersion liquid is injected into the horizontal well slug, wherein the mass fraction of the nano copper catalyst can be 0.35 to 0.5 percent.

(7) Injecting clear water slugs: after the nano metal catalyst slug is injected for the first time, saturated clear water and a hydrogen supply agent are injected until the clear water returns to a wellhead, the maximum injection pressure at the bottom of the well is 6.3 MPa, the optimized mining and injection ratio is about 0.95, and the mass fraction of the hydrogen supply agent can be 5%.

(8) Continuous electric heating and heating catalytic crude oil cracking: the underground electric heating device 4 is started, full power is adopted firstly, the environment in the shaft of the horizontal section is quickly heated to more than 280 ℃, then the temperature is switched to constant temperature heating, the first round of constant temperature heating time is 20 days, the environment temperature of the shaft of the horizontal section is required to be kept in the range of 280-350 ℃ during the period, and the highest temperature cannot exceed 350 ℃.

(9) And (3) circulating replacement liquid production: and (3) closing the downhole electric heating device 4, continuously injecting clear water with the mineralization degree of less than 200 mg/L and the temperature of less than 100 ℃ from the annular space between the long oil pipe 2 and the first continuous oil pipe, discharging produced liquid (namely an oil-water mixture in a shaft) from the annular space of the oil sleeve until no produced liquid or the crude oil content of the produced liquid is less than 5%, stopping circulating liquid replacement production, and ending the exploitation of the throughput production cycle of the round of electric heating nano metal catalyst slugs and clear water slugs.

(10) Exploitation of the subsequent production cycle of the electrically heated nano metal catalyst slugs and clear water slugs: the exploitation process of the production period of the electric heating nano metal catalyst slug and the clear water slug is the same as the exploitation process of the production period of the first electric heating nano metal catalyst slug and the clear water slug, namely, the exploitation process of each electric heating nano metal catalyst slug and the clear water slug throughput production period can be realized by repeating the steps (6) to (9), but the injection amount of the nano copper catalyst dispersion liquid in each new electric heating nano metal catalyst slug and the clear water slug throughput production period is increased by 20% compared with the production period of the last electric heating nano metal catalyst slug and the clear water slug, and the constant temperature heating time of the downhole electric heating device 4 in each new electric heating nano metal catalyst slug and the clear water slug throughput production period is prolonged by 15% compared with the constant temperature heating time of the last electric heating nano metal catalyst slug and the clear water slug throughput production period.

(11) Intermittent heating production cycle by green electricity: after the 6 rounds of electric heating nanometer metal catalyst slugs and clear water slugs are mined in a throughput production period, when the mining degree of a horizontal well reaches 30%, the ground control device can be connected with photovoltaic power generation, when Bai Tianguang volts of power generation can normally supply power, clear water matched with the power of the underground electric heating device 4 is injected, the underground electric heating device 4 is driven by utilizing the photovoltaic power generation, steam with dryness of more than 80% is generated underground, and the oil layer 9 is fully heated; and when the grid electricity is in the valley electricity period, switching to the grid electricity, maintaining low-power heating and starting self-spraying production. When the recovery degree reaches 40%, nitrogen injection is started to extract oil, namely, 30000 Nm ³ nitrogen is injected every 1 week of each production season until the production is finished.

In addition, in the later period of production, when gas lift oil extraction is difficult, the downhole electric heating device 4 and the temperature monitoring device 5 can be taken out, the third continuous oil pipe is put into the long oil pipe 2 again, the third continuous oil pipe is packaged with the downhole electric heating device 4 with the temperature monitoring device 5, the downhole pump is put into the short oil pipe 3 again, and oil extraction is continued through the downhole pump.

In the embodiment, compared with the conventional steam huff and puff exploitation in the prior art, after the electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well is adopted, the recovery ratio of the heavy oil reservoir is increased from 17.6% to 43.2%, the daily oil yield in the oil production peak period is increased from 6.7 t/d to 10.5 t/d, and the oil extraction efficiency and the oil reservoir utilization degree are greatly improved.

Example 8: as shown in fig. 1-6, the embodiment provides a horizontal well electric heating catalytic hydrothermal cracking exploitation method for a target oil reservoir two, which specifically includes the following steps:

(1) Selecting heavy oil reservoirs with proper reservoir parameters: the case of the target reservoir two is as follows:

① The middle part of the target oil layer 9 of the oil reservoir is buried by 360 m, a horizontal well is implemented, the oil layer 9 of the horizontal section of the well is a sand layer, the inner permeability level difference is 10, the thickness of the continuous oil layer reaches 8 m, and the oil reservoir has no side water and bottom water;

② The horizontal permeability is 800 mD, and the vertical permeability is 500 mD;

③ The viscosity of the crude oil at 50℃was 100000 mPa.s;

(2) Obtaining the fracture pressure of the oil layer: and (3) performing closed coring in a target oil reservoir II, selecting 3 typical samples, performing an indoor rock stress experiment, and determining that the minimum fracture pressure of an oil layer 9 of the oil reservoir is 8.2 MPa through experimental analysis.

(4) Optimizing the structural design of a well completion and a tubular column and designing and constructing an electric heating system: the horizontal section adopts a screen pipe 1 to complete the well, a long oil pipe 2 and a short oil pipe 3 are put into a shaft after completion, wherein the long oil pipe 2 is put into the toe end of the horizontal well, a first continuous oil pipe is put into the long oil pipe 2, a temperature monitoring device 5 is arranged in the first continuous oil pipe in a sealing way, and 8 temperature measuring points can be arranged at even intervals along the axial direction of the horizontal section of the horizontal well in the temperature monitoring device 5; the short oil pipe 3 is put into the heel end of the horizontal well, the second continuous oil pipe which can be laid into the toe end of the horizontal well is put into the short oil pipe 3, the underground electric heating device 4 is packaged in the second continuous oil pipe through mineral insulating materials, and the power density of the underground electric heating device 4 is 2 kW/m.

(5) Preparing oil extraction production: determining the total mining wheel number of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput to be 9 wheels by using a fine three-dimensional geological model through a numerical simulation method; cleaning a shaft, injecting clear water or softened water from an annular space between the long oil pipe 2 and the first continuous oil pipe, draining the annular space between the short oil pipe 3 and the second continuous oil pipe for 5 days until the shaft is cleaned.

(6) Injecting nano metal catalyst slugs: in the first round of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput, 5 tons of nano copper catalyst dispersion liquid is injected into the horizontal well slug, wherein the mass fraction of the nano copper catalyst can be 0.35 to 0.5 percent.

(7) Injecting clear water slugs: after the nano metal catalyst slug is injected for the first time, saturated clear water and a hydrogen supply agent are injected until the clear water returns to a wellhead, the maximum injection pressure at the bottom of the well is 7.7 MPa, the optimized mining and injection ratio is about 0.95, and the mass fraction of the hydrogen supply agent can be 5%.

(8) Continuous electric heating and heating catalytic crude oil cracking: the downhole electric heating device 4 is started, full power is adopted firstly, the environment in the shaft of the horizontal section is quickly heated to more than 280 ℃, then the temperature is switched to constant temperature heating, the first round of constant temperature heating time is 30 days, the environment temperature of the shaft of the horizontal section is required to be kept in the range of 280-350 ℃, and the highest temperature cannot exceed 350 ℃.

(11) Intermittent heating production cycle by green electricity: after the 9 rounds of exploitation of the production cycle of the electric heating nano metal catalyst slugs and the clear water slugs are completed, and when the extraction degree of a horizontal well reaches 30%, the ground control device can be connected with photovoltaic power generation, when Bai Tianguang volts of power generation can normally supply power, clear water matched with the power of the underground electric heating device 4 is injected, the underground electric heating device 4 is driven by the photovoltaic power generation, steam with dryness of more than 80% is generated underground, and the oil layer 9 is fully heated; and when the grid electricity is in the valley electricity period, switching to the grid electricity, maintaining low-power heating and starting self-spraying production. When the recovery degree reaches 40%, nitrogen injection is started to extract oil, namely, 40000 Nm ³ nitrogen is injected every 1 week of each production season until the production is finished.

In the embodiment, compared with the conventional steam huff and puff exploitation in the prior art, after the electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well is adopted, the recovery ratio of the heavy oil reservoir is increased from 13.9% to 38.8%, the daily oil yield in the oil production peak period is increased from 4.3 t/d to 7.8 t/d, and the oil extraction efficiency and the oil reservoir utilization degree are greatly improved.

Example 9: as shown in fig. 1-6, the embodiment provides a horizontal well electric heating catalytic hydrothermal cracking exploitation method for a target oil reservoir three, which specifically includes the following steps:

1. The preparation stage:

(1) Selecting heavy oil reservoirs with proper reservoir parameters: the case of target reservoir three is as follows:

① The middle part of the target oil layer 9 of the oil reservoir is buried at the depth of 450 m, a horizontal well is implemented, the oil layer 9 between the horizontal sections of the well is a sand layer, the in-layer permeability level difference is 10, the thickness of the continuous oil layer reaches 8m, and the oil reservoir has no side water and bottom water;

② The horizontal permeability is 600 mD, and the vertical permeability is 380 mD;

③ The viscosity of the crude oil at 50℃was 500000 mPa.s;

(2) Obtaining the fracture pressure of the oil layer: and (3) hermetically coring the target oil reservoir III, selecting 3 typical samples, carrying out an indoor rock stress experiment, and determining that the minimum fracture pressure of the oil layer 9 of the oil reservoir is 9.7 MPa through experimental analysis.

(3) Optimizing well distribution and drilling design: determining that a horizontal well deployment area is free of faults, wherein the length of a horizontal section is 400 m; five sections of track are adopted, namely a straight well section, an inclination increasing section, an inclination stabilizing section, an inclination increasing section and an inclination stabilizing section, and the horizontal section drills in an inclined direction along a vertical section construction line 12 of the horizontal well at an inclined angle of 91 degrees at a position which is 10 meters to one point and five meters away from the bottom boundary of an oil layer, so that the toe end of the horizontal well is about 7 m higher than the heel end of the horizontal well.

(4) Optimizing the structural design of a well completion and a tubular column and designing and constructing an electric heating system: the horizontal section adopts a screen pipe 1 to complete the well, a long oil pipe 2 and a short oil pipe 3 are put into a shaft after completion, wherein the long oil pipe 2 is put into the toe end of the horizontal well, a first continuous oil pipe is put into the long oil pipe 2, a temperature monitoring device 5 is arranged in the first continuous oil pipe in a sealing way, and 8 temperature measuring points can be arranged at even intervals along the axial direction of the horizontal section of the horizontal well in the temperature monitoring device 5; the short oil pipe 3 is put into the heel end of the horizontal well, the second continuous oil pipe which can be laid into the toe end of the horizontal well is put into the short oil pipe 3, the underground electric heating device 4 is packaged in the second continuous oil pipe through mineral insulating materials, and the power density of the underground electric heating device 4 is 3 kW/m.

(5) Preparing oil extraction production: determining the total mining wheel number of the production cycle of the electric heating nano metal catalyst slug and the clear water slug to be 11 wheels by using a fine three-dimensional geological model through a numerical simulation method; cleaning a shaft, injecting clear water or softened water from an annular space between the long oil pipe 2 and the first continuous oil pipe, draining the annular space between the short oil pipe 3 and the second continuous oil pipe for 5 days until the shaft is cleaned.

(6) Injecting nano metal catalyst slugs: in the first round of the production cycle of the electric heating nano metal catalyst slug and the clear water slug throughput, 8 tons of nano copper catalyst dispersion liquid is injected into the horizontal well slug, wherein the mass fraction of the nano copper catalyst can be 0.35 to 0.5 percent.

(7) Injecting clear water slugs: after the nano metal catalyst slug is injected for the first time, saturated clear water and a hydrogen supply agent are injected until the clear water returns to a wellhead, the maximum injection pressure at the bottom of the well is 9.2 MPa, the optimized mining and injection ratio is about 0.95, and the mass fraction of the hydrogen supply agent can be 5%.

(8) Continuous electric heating and heating catalytic crude oil cracking: the underground electric heating device 4 is started, full power is adopted firstly, the environment in the shaft of the horizontal section is quickly heated to more than 280 ℃, then the temperature is switched to constant temperature heating, the first round of constant temperature heating time is 45 days, the environment temperature of the shaft of the horizontal section is required to be kept in the range of 280-350 ℃, and the highest temperature cannot exceed 350 ℃.

(11) Intermittent heating production cycle by green electricity: after the 11 rounds of electric heating nanometer metal catalyst slugs and clear water slugs are mined in a throughput production period, when the mining degree of a horizontal well reaches 30%, the ground control device can be connected with photovoltaic power generation, when Bai Tianguang volts of power generation can normally supply power, clear water matched with the power of the underground electric heating device 4 is injected, the underground electric heating device 4 is driven by utilizing the photovoltaic power generation, steam with dryness of more than 80% is generated underground, and the oil layer 9 is fully heated; and when the grid electricity is in the valley electricity period, switching to the grid electricity, maintaining low-power heating and starting self-spraying production. When the recovery degree reaches 40%, nitrogen injection is started to extract oil, namely, 1 week of each production quarter, 50000 Nm ³ nitrogen is injected until the production is finished.

In the embodiment, compared with the conventional steam huff and puff exploitation in the prior art, after the electric heating catalytic hydrothermal cracking exploitation method of the heavy oil reservoir horizontal well is adopted, the recovery ratio of the heavy oil reservoir is increased from 11.3% to 36.5%, and the daily oil production in the peak period of oil production is increased from 3.3 t/d to 6.7 t/d, so that the oil production efficiency and the utilization degree of the oil reservoir are greatly improved.

Example 10: as shown in fig. 1-2, the electric heating catalytic hydrothermal cracking exploitation system for the heavy oil reservoir horizontal well comprises:

the well-laying and well-completion module is used for setting a horizontal well in a selected target oil reservoir, and a production oil pipe is arranged in the horizontal well after well completion, wherein the well inclination angle of the horizontal well is larger than 90 degrees, and the horizontal section of the horizontal well is completed by adopting a screen pipe 1;

the electric heating system design and construction module is used for designing and constructing an electric heating system, wherein the electric heating system comprises an underground electric heating device 4 and a temperature monitoring device 5, and a continuous oil pipe with the underground electric heating device 4 and the temperature monitoring device 5 is lowered from a production oil pipe to the toe end of a horizontal well, and the underground electric heating device 4 is positioned in the horizontal section of the horizontal well;

The slug throughput exploitation module is used for starting exploitation of M rounds of electric heating nano metal catalyst slugs and clear water slug throughput production periods, and each electric heating nano metal catalyst slug and clear water slug throughput production period comprises the following steps: sequentially injecting a nano metal catalyst dispersion liquid slug and a clear water slug into the horizontal well; starting an underground electric heating device 4, continuously heating the horizontal section of the horizontal well within a set time period through the mutual matching of the underground electric heating device 4 and a temperature monitoring device 5, and catalyzing crude oil to generate a hydro-thermal cracking reaction; after the hydrothermal cracking, the circulating fluid replacement production is carried out, whether the produced fluid is absent or whether the crude oil content in the produced fluid is less than 5% is judged, if so, the circulating fluid replacement production is ended, and if not, the circulating fluid replacement production is continued; after the throughput production period of each electric heating nano metal catalyst slug and clear water slug is finished, determining the number N of exploitation wheels of the current throughput production period of the electric heating nano metal catalyst slug and clear water slug, judging whether N is more than or equal to M, if not, entering exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug of the next round, and if so, finishing exploitation of the throughput production period of the electric heating nano metal catalyst slug and clear water slug by 20% as compared with the throughput production period of the last electric heating nano metal catalyst slug and clear water slug, wherein the heating duration of the downhole electric heating device 4 in the throughput production period of each new electric heating nano metal catalyst slug and clear water slug is longer than that of the last electric heating nano metal catalyst slug and clear water slug by 15%.

The electric heating catalytic hydrothermal cracking exploitation system of the heavy oil reservoir horizontal well can be further optimized or/and improved according to actual needs:

Example 11: as shown in fig. 1-2, the device further comprises a green electricity exploitation module, after the exploitation of the M rounds of electric heating nano metal catalyst slug and clear water slug throughput production period, and when the exploitation degree of the horizontal well reaches 25% to 30%, the exploitation of the green electricity-to-intermittent heating production period is started, wherein the intermittent heating production period comprises:

After the green electricity is connected into the electric heating system, judging whether the green electricity supply quantity is matched with the heating power of the underground electric heating device 4;

if so, injecting clear water into the horizontal well, starting the underground electric heating device 4, heating the clear water to produce high-dryness steam, and enabling the high-dryness steam to enter the oil reservoir to heat the oil layer 9;

The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.

Claims

1. A method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis, characterized in that it comprises:

A horizontal well is set in the selected target reservoir, and a production tubing is run into the horizontal well after completion, wherein the well inclination angle of the horizontal well is greater than 90°, and the horizontal section of the horizontal well is completed with a screen pipe;

Design and construct an electric heating system, which includes a downhole electric heating device and a temperature monitoring device. The coiled tubing with the downhole electric heating device and the temperature monitoring device is lowered from the production tubing to the toe of the horizontal well, wherein the downhole electric heating device is located in the horizontal section of the horizontal well;

Prepare for oil production, including: obtaining the total number of production rounds M of the throughput production cycle of the electric heating nano metal catalyst slug and the clean water slug, and cleaning the wellbore until all the drilling mud in the wellbore is circulated to the ground;

M rounds of electric heating of nano metal catalyst slugs and clear water slugs are started for production in throughput cycles, and each throughput production cycle of the electric heating of nano metal catalyst slugs and clear water slugs includes: sequentially injecting nano metal catalyst dispersion slugs and clear water slugs into the horizontal well; starting the downhole electric heating device, and continuously heating the horizontal section of the horizontal well within a set time by cooperating with the downhole electric heating device and the temperature monitoring device to catalyze the aquathermal cracking reaction of the crude oil; circulating replacement fluid production after aquathermal cracking, and judging whether there is no produced fluid or the crude oil content in the produced fluid is less than 5% after the circulating replacement fluid production, if so, terminating the circulating replacement fluid production, and if not, continuing the circulating replacement fluid production;

After each electric heating nano metal catalyst slug and clean water slug throughput production cycle is completed, the number of mining rounds N of the current electric heating nano metal catalyst slug and clean water slug throughput production cycle is determined, and it is judged whether N is greater than or equal to M. If not, the mining of the next round of electric heating nano metal catalyst slug and clean water slug throughput production cycle is entered, and the nano metal catalyst injection amount in each new electric heating nano metal catalyst slug and clean water slug throughput production cycle is increased by 20% compared with the previous electric heating nano metal catalyst slug and clean water slug throughput production cycle, and the heating time of the downhole electric heating device in each new electric heating nano metal catalyst slug and clean water slug throughput production cycle is extended by 15% compared with the previous electric heating nano metal catalyst slug and clean water slug throughput production cycle. If so, the mining of the electric heating nano metal catalyst slug and clean water slug throughput production cycle is terminated.

2. The method for producing heavy oil reservoir horizontal wells by electrically heating catalytic aquathermolysis according to claim 1 is characterized in that the downhole electric heating device is turned on, and the downhole electric heating device and the temperature monitoring device cooperate with each other to continuously heat the horizontal section of the horizontal well within a set time, catalyzing the aquathermolysis reaction of the crude oil, comprising:

Turn on the underground electric heating device, and use full power heating;

The underground electric heating device determines whether the real-time wellbore ambient temperature collected by the temperature monitoring device reaches the temperature threshold value;

If so, the downhole electric heating device is adjusted to constant temperature heating to continuously catalyze the aquathermal cracking reaction of the crude oil;

Determine whether the heating time of the downhole electric heating device reaches the set time. If so, turn off the downhole electric heating device. If not, the downhole electric heating device continues to heat at a constant temperature.

3. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis according to claim 1 or 2, characterized in that the preparation for oil production further comprises:

Obtain the oil layer fracture pressure to ensure that each time a water plug is injected into the horizontal well, the bottom hole injection pressure of the clean water is 0.5 MPa to 1 MPa less than the oil layer fracture pressure.

4. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis according to claim 1 or 2, characterized in that:

The mass concentration of the nano-metal catalyst dispersion is 0.05% to 2%, and the mineralization of the clean water is less than 200 mg/L;

Or/and, the well inclination angle of the horizontal well is 91° to 95°, and the distance between the horizontal section of the horizontal well and the bottom of the oil layer is 1 m to 1.5 m.

5. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis according to claim 3, characterized in that:

6. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis according to claim 1, 2 or 5, characterized in that it also includes starting the production of intermittent heating production cycle using green electricity after the production of M rounds of electrically heated nano-metal catalyst slugs and clean water slugs, and when the horizontal well production degree reaches 25% to 30%, the intermittent heating production cycle includes:

After connecting the green electricity to the electric heating system, determine whether the green electricity supply is compatible with the heating power of the underground electric heating device;

If yes, then clean water is injected into the horizontal well, and the downhole electric heating device is turned on to heat the clean water to produce high-dryness steam, so that the high-temperature steam enters the oil reservoir to heat the oil layer;

If not, connect the grid power to the electric heating system to determine whether the grid power is in the off-peak period. If not, shut down the well and keep it soaked. If so, use the grid power to maintain low-power heating in the electric heating system and start gas lift or self-flowing production.

7. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic aquathermolysis according to claim 3, characterized in that it also includes starting the production of intermittent heating production cycle using green electricity after the production of M rounds of electrically heated nano-metal catalyst slugs and clean water slugs, and when the horizontal well production degree reaches 25% to 30%, the intermittent heating production cycle includes:

8. The method for producing heavy oil reservoir horizontal wells by electrically heated catalytic hydrothermal cracking according to claim 4, characterized in that it also includes starting the production of intermittent heating production cycle using green electricity after the production of M rounds of electrically heated nano-metal catalyst slugs and clean water slugs, and when the horizontal well production degree reaches 25% to 30%, the intermittent heating production cycle includes:

9. An electric heating catalytic aquathermal cracking production system for horizontal wells in heavy oil reservoirs using the method according to any one of claims 1 to 8, characterized in that it comprises:

Well arrangement and completion module: a horizontal well is set in the selected target reservoir, and a production tubing is run into the horizontal well after completion. The well inclination angle of the horizontal well is greater than 90°, and the horizontal section of the horizontal well is completed with a screen pipe;

Electric heating system design and construction module, design and construction of electric heating system, the electric heating system includes downhole electric heating device and temperature monitoring device, the coiled tubing with downhole electric heating device and temperature monitoring device is lowered from the production tubing to the toe of the horizontal well, wherein the downhole electric heating device is located in the horizontal section of the horizontal well;

Preparation module, preparing for oil production, including: obtaining the total number of production rounds M of the throughput production cycle of the electric heating nano metal catalyst slug and the clean water slug, cleaning the wellbore until all the drilling mud in the wellbore is circulated to the ground;

The slug throughput production module starts the production of M rounds of electric heating nano metal catalyst slugs and clean water slug throughput production cycles. Each electric heating nano metal catalyst slug and clean water slug throughput production cycle includes: injecting nano metal catalyst dispersion slugs and clean water slugs into the horizontal well in sequence; starting the downhole electric heating device, and continuously heating the horizontal section of the horizontal well within a set time through the cooperation of the downhole electric heating device and the temperature monitoring device to catalyze the aquathermal cracking reaction of the crude oil; circulating replacement fluid production after aquathermal cracking, and judging whether there is no produced fluid or the crude oil content in the produced fluid is less than 5% after the circulating replacement fluid production, if so, then the circulating replacement fluid production is terminated, if not, then the circulating replacement fluid production is continued; after each electric heating nano metal catalyst slug and clean water slug throughput production cycle, determine when The number of mining rounds N of the previous electric heating nano metal catalyst slug and clean water slug throughput production cycle is determined, and it is determined whether N is greater than or equal to M. If not, the mining of the next round of electric heating nano metal catalyst slug and clean water slug throughput production cycle is entered, and the injection amount of nano metal catalyst in each new electric heating nano metal catalyst slug and clean water slug throughput production cycle is increased by 20% compared with the previous electric heating nano metal catalyst slug and clean water slug throughput production cycle, and the heating time of the downhole electric heating device in each new electric heating nano metal catalyst slug and clean water slug throughput production cycle is extended by 15% compared with the previous electric heating nano metal catalyst slug and clean water slug throughput production cycle. If so, the mining of the electric heating nano metal catalyst slug and clean water slug throughput production cycle is terminated.

10. The heavy oil reservoir horizontal well electric heating catalytic aquathermal cracking production system according to claim 9, characterized in that it also includes a green electricity production module, after the production of M rounds of electric heating nano metal catalyst slugs and clean water slugs, and when the horizontal well production rate reaches 25% to 30%, the production of the intermittent heating production cycle using green electricity is started, and the intermittent heating production cycle includes: