CN117052361B - Device and method for simulating segmented exploitation of natural gas hydrate in layered distribution reservoir - Google Patents
Device and method for simulating segmented exploitation of natural gas hydrate in layered distribution reservoir Download PDFInfo
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- CN117052361B CN117052361B CN202311098196.8A CN202311098196A CN117052361B CN 117052361 B CN117052361 B CN 117052361B CN 202311098196 A CN202311098196 A CN 202311098196A CN 117052361 B CN117052361 B CN 117052361B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000009826 distribution Methods 0.000 title abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 52
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000003345 natural gas Substances 0.000 claims abstract description 4
- -1 natural gas hydrates Chemical class 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000005065 mining Methods 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000004576 sand Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 4
- 238000002474 experimental method Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 claims 1
- 230000006399 behavior Effects 0.000 abstract description 6
- 150000004677 hydrates Chemical class 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 15
- 239000011229 interlayer Substances 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000002274 desiccant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000003938 response to stress Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a device and a method for simulating the sectional exploitation of natural gas hydrate in a layered distribution reservoir, wherein an exploitation well in the device adopts a sectional exploitation vertical shaft, the inside of the exploitation well is divided into a plurality of sections along the length direction of the shaft, the sections are separated and mutually independent, and outlets of different sections of the segmented exploitation shaft are respectively connected with a back pressure control system and a production metering system. The device can be used for indoor simulation of the subsection exploitation of the natural gas hydrate in the layered distribution reservoir, and contrast of the differences of production behaviors in the exploitation processes of the hydrates in different exploitation sections of the exploitation well. The method can be used for exploring the optimal exploitation methods and exploitation pressures of different layers in the hydrate layered distribution reservoir to obtain the optimal exploitation method combination and the optimal exploitation efficiency of the natural gas hydrate in the layered distribution reservoir. The method provides scientific support for effectively preventing engineering disasters, prolonging the exploitation time of the hydrates and efficiently exploiting the natural gas hydrates in the layered distribution reservoir.
Description
Technical Field
The invention belongs to the field of rock-soil and energy engineering, relates to a natural gas hydrate exploitation simulation device and method, and particularly relates to a natural gas hydrate segmented exploitation simulation experiment device and method in a layered distribution reservoir, which are suitable for exploring the optimal exploitation methods and exploitation pressures of different layers in the layered distribution reservoir of the hydrate and obtaining the optimal exploitation methods and exploitation efficiencies of the natural gas hydrate in the layered distribution reservoir.
Background
The natural gas hydrate is clean and efficient, has wide distribution and large reserves, is an ideal novel clean energy, and becomes an important development direction for energy conversion type competitive pursuits of various countries in recent years. Past on-site production trials have demonstrated the technical feasibility of producing natural gas from hydrate reservoirs. However, achieving commercial production of natural gas hydrates still presents a significant challenge.
Hydrate reservoir characteristics affect hydrate recovery safety and recovery efficiency. The sea area of the land slope fox in the north and south of the south sea is a first test collecting area of the hydrate in China, the depositing effect of the canyon area is complex, the hydrate reservoir is in longitudinal uneven distribution and is in layered distribution, the seepage, heat transfer and mechanical properties of each reservoir are obviously different, and the exploitation difficulty is greatly increased. The original mechanical balance of the reservoir is broken through in the hydrate exploitation, so that the solid natural gas hydrate is decomposed into methane gas and water, the original stress distribution is changed, the effective stress of the sediment is increased, the pore space of the reservoir is compressed, the seepage channel of fluid is changed, and the liquid-gas migration is influenced to obviously change the exploitation gas production efficiency. However, the stress response of different reservoirs to the same production pressure is different due to the difference of reservoir characteristics, so that the production well is stressed unevenly in the longitudinal direction, and a remarkable and uneven gas-liquid two-phase seepage field is formed when the hydrate is decomposed due to the uneven characteristic, so that the gas-water production rules in the production process of the reservoirs with different characteristics are remarkably different, meanwhile, the migration of soil particles is extremely likely to be induced, serious sand production problems are caused, and even engineering disasters such as inclination of the production well, breakage of a shaft and the like can be caused.
It follows that different hydrate reservoir types are amenable to different production methods or different depressurization production rates. In order to improve the exploitation efficiency of the hydrate, the exploitation duration of the hydrate is increased, different exploitation strategies are selected according to different reservoir characteristics in the actual exploitation process, and different exploitation pressures are adopted to realize the optimal exploitation of a plurality of reservoir combinations, so that the purpose of sectionally and efficiently exploiting the natural gas hydrate in the layered distribution reservoir is achieved.
Meanwhile, the hydrate exploitation productivity is influenced by engineering factors such as the position of a decompression section of the exploitation well and the reinforcement condition of the well wall. Fluid migration and production behavior are not the same when different reservoir hydrates are produced. And the hydrate decomposition can generate larger axial compression and tensile loads in the exploitation section and above the exploitation section respectively, so that the stress change, the gas production efficiency and the sand production water production behavior of different positions of the exploitation well are different. In order to safely and effectively mine natural gas hydrate, the mining efficiency of different mining sections of a mining well needs to be explored and compared, the service extreme position of the well wall and the severe sand production position are determined, and the gas production optimal point is defined. And then reinforcing and protecting the weak position to prevent disasters, improve the exploitation efficiency and prolong the exploitation time of the hydrate. However, the research related to this is currently blank. Therefore, a device and a method for simulating the sectional exploitation of natural gas hydrate in a layered distribution reservoir to explore the differences of hydrate decomposition and gas production behaviors of different exploitation sections of an exploitation well are needed to be solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the application aims to provide a device and a method for simulating the sectional exploitation of natural gas hydrate in a layered distribution reservoir, so as to accurately and quantitatively explore the optimal exploitation methods and exploitation pressures of different layers in the layered distribution reservoir and obtain the optimal exploitation methods and exploitation efficiencies of the natural gas hydrate in the layered distribution reservoir.
The technical scheme adopted by the invention is as follows:
a sectional exploitation simulation experiment device for natural gas hydrate in a layered distribution reservoir comprises an autoclave, a gas injection system, a liquid injection system, a data acquisition device and a exploitation well, wherein the autoclave is respectively connected with the gas injection system and the liquid injection system, the exploitation well is arranged in the autoclave, a sealing structure is arranged at the contact part of the exploitation well and a cover of the autoclave, a plurality of interfaces are arranged at different depths of the autoclave and used for installing sensors to detect model hole pressure or temperature and transmit the model hole pressure or temperature to the data acquisition device, the exploitation well is a sectional exploitation shaft, the inside of the exploitation well is divided into a plurality of sections along the length direction of the shaft, the sections are separated from each other and independent, and outlets of different sections of the sectional exploitation shaft are respectively connected with a back pressure control system and a production metering system.
In the above technical scheme, further, the sectional type exploitation vertical shaft is of a cylindrical sleeve structure, a plurality of layers of sleeves are arranged in the exploitation well, the lengths of the sleeves are sequentially increased from outside to inside, the tops of the sleeves are all positioned at the top of the exploitation well, the bottoms of the sleeves are respectively separated from the inner wall of the exploitation well by a gas-liquid sealing interlayer, so that a plurality of independent exploitation sections are formed, and perforation holes are uniformly distributed on the surface of each section of exploitation well.
Further, each section of the sectional type exploitation vertical shaft is separated by a gas-liquid sealing interlayer, the gas-liquid sealing interlayer is the same as the sectional type exploitation vertical shaft, and the gas-liquid sealing interlayer is welded with the lower ends of the sections in the exploitation vertical shaft into a whole so as to ensure that the different sections of the sectional type exploitation vertical shaft are mutually independent, prevent the mutual leakage of water vapor and methane gas collected by the different sections of the sectional type exploitation vertical shaft, and ensure that the pressure control and the gas and water production collection of each section can be respectively carried out.
The back pressure control system comprises an outlet pressure sensor, a sand filter, a back pressure valve, a back pressure buffer container and a plunger pump which are sequentially connected, wherein the outlet ends of different sections of the sectional type mining vertical shaft are respectively connected with the outlet pressure sensor of one back pressure control system through a valve, and the mining pressures of different mining sections of the sectional type mining vertical shaft are respectively controlled by different back pressure control systems.
The production metering system comprises a gas-liquid separator, a balance, a drying agent, a humidity flowmeter and a gas flowmeter, wherein an outlet end of a back pressure valve in a back pressure control system is connected with the gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with the balance to measure the water yield in real time, an exhaust port of the gas-liquid separator is sequentially connected with the humidity flowmeter, the dryer and the gas flowmeter to measure the gas yield in real time, and each back pressure control system is correspondingly connected with one production metering system to realize the respective collection and measurement of the gas yield and the water yield at different sections of the sectional type exploitation vertical shaft.
The invention utilizes the sectional type exploitation vertical shaft to simulate the sectional exploitation of the natural gas hydrate in the layered distribution reservoir in the hydrate exploitation simulation device. And respectively controlling the exploitation pressure of different exploitation sections of the exploitation well and respectively collecting and measuring produced gas and produced water so as to accurately explore the optimal exploitation methods and exploitation pressure of different layers in the layered distribution reservoir and obtain the optimal exploitation methods and exploitation efficiency of the natural gas hydrate in the layered distribution reservoir.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects by way of example and not limitation:
(1) The method is suitable for the technical field of deep sea energy exploitation, can reliably and accurately explore the optimal exploitation pressure of different layers of the layered distribution reservoir, compares the production efficiency of different exploitation sections of the exploitation well, so as to explore the optimal exploitation method and the optimal exploitation pressure of different layers of the layered distribution reservoir of the hydrate, compares the production efficiency of different sections of the exploitation well and defines the optimal point of gas production, provides a basis, fills the blank of the sectional exploitation of the natural gas hydrate in the layered distribution reservoir at present, and is expected to solve the problem that the production behavior difference of different exploitation sections of the exploitation well is difficult to explore in the exploitation process of the natural gas hydrate.
(2) The device of the invention has significant technical advantages over other devices. The device has simple structure and is easy to process and manufacture. In the hydrate exploitation process, the exploitation pressure of reservoirs with different characteristics can be respectively and independently controlled by utilizing the sectional exploitation vertical shaft, and the gas and water production of different layers of the exploitation vertical shaft can be respectively obtained at the same time, so that the method has stronger scientificity and comparability.
(3) The experimental device can be carried on a hypergravity centrifuge to work, simulate soil layer response and catastrophe process of natural gas hydrate on-site exploitation, and provide scientific support for natural gas hydrate exploitation simulation experiments.
Drawings
FIG. 1 is a schematic diagram of a device structure according to an embodiment of the present invention;
FIG. 2 is an elevation view of a segmented production shaft in accordance with one embodiment of the present invention;
FIG. 3 is a sectional view of a segmented production shaft in one embodiment of the present invention;
FIG. 4 is a cross-sectional view of the segmented production shaft A-A of FIG. 3 of the present invention;
Fig. 5 is a schematic illustration of a segmented production shaft to autoclave connection in an embodiment of the present invention.
The reference numerals comprise a pressure regulating valve 1, a pressurizing container 2, a gas booster pump 3, a gas cylinder 4, a pressure reducing valve 5, a solenoid valve 6, a gas cylinder 7, an air compressor 8, a nitrogen cylinder 9, a gas flowmeter 10, a sectional type exploitation shaft, a valve 11, a pressure sensor 12, a sand filter 13, a back pressure valve 14, a advection pump 15, a liquid storage tank 16, a steam generator 17, a servo tracking pump 18, a 19-hole pressure meter 20, a constant-temperature water bath box 21, a back pressure buffer container 22, a plunger pump 23, a drying agent 24, a humidity flowmeter 25, a gas-liquid separator 26, an electronic balance 27, a exploitation shaft non-hole section, a 28 perforation, a 29 well wall, a 30 upper section pressure control channel, a 31 middle section pressure control channel, a 32 lower section pressure control channel, a 33 sectional type exploitation shaft outer connecting port 34 sectional type exploitation shaft inner wall, a 35 gas-liquid sealing layer, a 36 sealing pressure cap, a fixed seat, a 38 sealing piece, a 39 high pressure kettle cover and a 40 high pressure kettle wall.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and specific embodiments:
As shown in figure 1, the device for simulating the sectional exploitation of natural gas hydrate in a layered distribution reservoir comprises an autoclave, a sectional exploitation vertical shaft 10, a gas injection system, a liquid injection system, a plurality of back pressure control systems, a plurality of production metering systems, a cold water bath temperature control system and a data acquisition device, wherein the autoclave is a cylindrical alloy container with specific volume, a hydrate reservoir model is arranged in the autoclave, a diversion coil and a sealed water bath protective sleeve are sequentially wrapped outside the autoclave, the autoclave is connected with the gas injection system and the liquid injection system through valves 11 respectively, the main functions of the liquid injection system are to inject liquid into the autoclave at a certain speed or a certain pressure under the heavy force, the main functions of the liquid injection system are to control the speed and the pressure of the liquid injection system, the pneumatic valve is used to control the opening and closing of a pipeline, the main functions of the gas injection system are to inject gas with a certain pressure into the autoclave under the heavy force, the main functions of the gas injection system are to generally comprise a gas cylinder, an air compressor, a gas booster pump, a pressurizing container and a pressure regulating valve, the gas pressure of the autoclave is filled with the gas pressure of the container, the water bath circulating through the constant temperature control system is provided with the constant temperature, the water bath circulation is stable, the water bath stability can be provided for the refrigerating water bath circulation under the constant temperature control of the water bath, the constant temperature can be realized by the constant temperature control of the water bath circulating system, and the refrigerating water bath is stable, the refrigerating water circulation can be provided by the constant temperature and the constant temperature control of the water bath can be provided by the constant temperature and the refrigerating water circulation. Several interfaces are set up on the autoclave at different depths for installing sensors such as pore pressure sensor, temperature sensor to detect model pore pressure or temperature and transmit to data collector. The number of the back pressure control systems and the production metering systems is the same as the number of the sections of the sectional type exploitation vertical shafts, and the back pressure control systems can respectively control the exploitation pressures of the different exploitation sections of the sectional type exploitation vertical shafts so as to explore the optimal exploitation pressures of different layers of the layered distribution reservoir and achieve the purpose of efficiently exploiting the hydrate in the layered distribution reservoir.
The sectional type exploitation vertical shaft 10 is of a cylindrical sleeve structure, a plurality of layers of sleeves are arranged in the exploitation well, the lengths of the sleeves are sequentially increased from outside to inside, the tops of the sleeves are positioned at the top of the exploitation well, the bottoms of the sleeves and the inner wall of the exploitation well are respectively separated by a gas-liquid sealing layer, so that a plurality of independent exploitation sections are formed, perforation holes are uniformly distributed on the surface of each exploitation well, and as shown in fig. 2,3 and 4, the sectional type exploitation vertical shaft 10 provided by the embodiment of the invention adopts 316 stainless steel, and the part extending into an autoclave is of a cylindrical structure with the diameter of 10mm and the total length of 575 mm. The sectional type exploitation vertical shaft 10 adopts a sleeve welding mode, is divided into three sections according to the simulated layered distribution reservoir working condition, each section is 180mm, perforation holes are uniformly distributed, and the part, extending into the kettle body, of the exploitation well is reserved with 35mm and is not provided with holes. The gas-liquid sealing interlayer 35 is adopted between different sections to separate the pressure control and the gas production and water production collection of each section, the material of the gas-liquid sealing interlayer 35 can be the same as that of the sleeve, and the gas-liquid sealing interlayer 35 is welded between the bottom of each section of the sleeve and the inner wall of the exploitation well. The outlets of different sections of the sectional type exploitation vertical shaft 10 are respectively connected with an outlet pressure sensor 12, a sand filter 13 and a back pressure valve 14, so that the pressure control of different sections of the sectional type exploitation vertical shaft 10 and the collection and measurement of the gas and water production can be realized.
As shown in fig. 5, the sectional mining shaft 10 extends vertically from the top of the autoclave cover 39 into the inner cavity of the autoclave, and is positioned and fixed by a fixing seat. The junction of the segmented production shaft 10 and the top of the autoclave cover 39 is tightly sealed by a sealing press cap 36 and a sealing element 38 is filled between the sealing press cap and the sealing press cap to ensure the tightness of the inside of the autoclave.
The autoclave is a cylindrical C276 alloy container with an inner cavity volume of 200L, can work under the condition that the highest hypergravity centrifugal acceleration is 300g, has a pressure bearing range of 0-35 MPa and a working temperature of 0-90 ℃, adopts O-shaped ring sealing at a cover of the autoclave, adopts sealing pressure cap 36 to tightly seal a reserved measuring point, and is provided with a top inlet and a bottom inlet. The center of the autoclave is provided with a sectional type exploitation vertical shaft 10, the sectional type exploitation vertical shaft 10 extends into an inner cavity from the top of an autoclave cover 39, and a hydrate reservoir model is arranged in the inner cavity of the autoclave. A sealed high strength water bath protective sleeve is wrapped around the autoclave, and a plurality of interfaces are left on the autoclave wall 40 for arranging the pore pressure sensor and the temperature sensor. Meanwhile, the autoclave is externally connected with a gas injection system, a liquid injection system and a cold water bath temperature control system.
The number of segments of the segment-type exploitation vertical shaft 10 is the same as the number of back pressure control systems and the number of production metering systems, and the back pressure control systems are in one-to-one correspondence, and each back pressure control system comprises an outlet pressure sensor 12, a sand filter 13, a back pressure valve 14, a back pressure buffer container 21 and a plunger pump 22. The outlet ends of different sections of the sectional type exploitation vertical shaft 10 are respectively connected with a valve 11, an outlet pressure sensor 12, a sand filter 13, a back pressure valve 14, a back pressure buffer container 21 and a plunger pump 22 in sequence. The back pressure control system of the sectional type exploitation vertical shaft can respectively control exploitation pressures of different exploitation sections of the sectional type exploitation vertical shaft 10 so as to explore the optimal exploitation pressures of different layers of the layered distributed reservoir and achieve the aim of efficiently exploiting the hydrate in the layered distributed reservoir.
The production metering system comprises a gas-liquid separator 25, an electronic balance 26, a drying agent 23, a humidity flowmeter 24 and a gas flowmeter 9. In the example in the figure, the outlet ends of the three back pressure valves 14 are respectively connected with a gas-liquid separator 25, the liquid outlet of the gas-liquid separator 25 is connected with an electronic balance 26 for real-time measurement of water yield, and the air outlet of the gas-liquid separator 25 is sequentially connected with a humidity flowmeter 24, a dryer 23 and a gas flowmeter 9 for real-time measurement of gas yield.
The liquid injection system in particular comprises a advection pump 15 and a pneumatic valve. The advection pump 15 controls the rate and pressure of liquid injection, and the pneumatic valve is used to control the opening and closing of the pipeline.
The gas injection system comprises a methane gas cylinder 6, a nitrogen gas cylinder 8, an air compressor 7, a gas booster pump 3, a booster container 2 and a pressure regulating valve 1. Wherein the pressure of gas injected into the autoclave is increased by a gas booster pump 3, high-pressure gas caching is performed by a booster container 2, and then the opening and closing of a pipeline are controlled by a pressure regulating valve 1.
The main function of the embodied cold water bath temperature control system is to provide a stable refrigeration source for the simulation of the hydrate stratum environment under the heavy force, and the system comprises a constant temperature water bath box 20, a refrigeration circulating pump and a water bath jacket. The refrigeration circulating pump provides constant-temperature circulating water, and can maintain the temperature stability of 5-16 ℃.
In specific implementation, the back pressure valve 14 is provided with three openings, including an inlet end, an outlet end and a pressure control end, wherein the inlet end is connected with the sand filter 13, the outlet end is connected with the gas-liquid separator 25, the pressure control end is connected with a back pressure sensor and a back pressure buffer container 21, and the plunger pump 22 behind the back pressure buffer container 21 is used for controlling the on-off of a passage of the outlet back pressure valve 14 so as to respectively control the mining pressures of different mining sections of the segmented mining vertical shaft 10.
Therefore, the invention solves the problem that the production behavior difference of different exploitation sections of the exploitation well is difficult to explore in the existing natural gas hydrate exploitation process, and achieves the purposes of accurately exploring the optimal exploitation methods and exploitation pressures of different layers in the layered distribution reservoir to obtain the optimal exploitation methods and exploitation efficiencies of the natural gas hydrate in the layered distribution reservoir. The device can also be carried on a hypergravity centrifugal machine to work so as to simulate and research soil layer response and catastrophe process of on-site exploitation of natural gas hydrate.
It should be noted that the embodiments of the present application are preferred embodiments, and are not intended to limit the present application in any way. The technical features or combinations of technical features described in the embodiments of the present application should not be regarded as isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations are also included within the scope of the preferred embodiments of the present application and should be understood by those skilled in the art to which the embodiments of the present application pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not limitative. Thus, other examples of the exemplary embodiments may have different values.
The drawings of the application are in a very simplified form and are not to scale precisely, but are for the purpose of illustrating embodiments of the application conveniently and clearly, and are not intended to limit the scope of the application. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure without affecting the effects and the achieved objects of the present application.
The above description is only illustrative of the preferred embodiments of the application and is not intended to limit the scope of the application in any way. Any alterations or modifications of the application, which are obvious to those skilled in the art based on the teachings disclosed above, are intended to be equally effective embodiments, and are intended to be within the scope of the appended claims.
Claims (4)
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| CN110984977A (en) * | 2019-12-24 | 2020-04-10 | 江西省科学院能源研究所 | Experimental simulation device and method for exploiting hydrate reservoir in superposed horizontal well |
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| CN104453794B (en) * | 2014-11-20 | 2017-05-17 | 中国科学院广州能源研究所 | Simulation experiment system for whole process of natural gas hydrate exploitation and simulation method |
| CN110847873B (en) * | 2019-11-08 | 2021-01-15 | 中国科学院广州能源研究所 | In-situ hydraulic jet extraction device and method for low-permeability natural gas hydrate reservoir |
| CN111443182B (en) * | 2020-05-09 | 2024-08-27 | 中国华能集团有限公司 | Supergravity hydrate research experiment system and method |
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| CN110984977A (en) * | 2019-12-24 | 2020-04-10 | 江西省科学院能源研究所 | Experimental simulation device and method for exploiting hydrate reservoir in superposed horizontal well |
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