CN115898322B - A water control process method, system and application for oil reservoir seepage field transformation - Google Patents
A water control process method, system and application for oil reservoir seepage field transformation Download PDFInfo
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Abstract
The invention relates to a water control process method, a system and an application of oil reservoir seepage field transformation, wherein the process method comprises a two-step process method or a one-step process method, the two-step process method comprises large pore canal plugging operation and seepage field transformation operation, the large pore canal plugging operation comprises large pore canal plugging slugs and large pore canal plugging processes, and the seepage field transformation operation comprises seepage field transformation slugs and seepage field transformation processes. The invention provides a water control process method for modifying an oil reservoir seepage field, which provides a seepage field modification water control technology, adopts a fracturing technology, provides effective technological measure guarantee for injection of chemical plugging agents, widens the selection range of the chemical plugging agents, plays the synergistic effect of different chemical plugging agents, changes the seepage field of stratum near a shaft, realizes the purposes of water control and oil increase, improves the water control effect, has a large modification range, and prolongs the water control effective period.
Description
Technical Field
The invention belongs to the technical field of oil extraction engineering, and particularly relates to a water control process method, a system and application for oil reservoir seepage field reconstruction.
Background
Along with the development of the medium-high permeability sandstone oil reservoir, the injected water or side water is suddenly fed along the high permeability layer or the high permeability strip to cause the water content of the oil well to rise, even the water is suddenly flooded, the development effect of the oil field is poor, and the recovery ratio of the oil field is affected. The traditional process method is chemical water shutoff. The main water outlet interval is found through water finding operation, the packer is put in, and the chemical plugging agent is injected at fixed points to perform water plugging operation. When the water interval cannot be judged or the water outlet interval cannot be separated from other intervals, the plugging agent is injected into the stratum in a general way by adopting a selective injection process, the plugging agent preferentially enters a water flow dominant channel through the difference of stratum permeability and a low-displacement injection process, and the plugging of a large pore canal is realized, so that the liquid production section is improved, and the water content of a production well is reduced.
The chemical water shutoff method has simple construction process, but low success rate, low yield increase amplitude and short effective period. On one hand, the chemical plugging agent is generally crosslinked or precipitated by resin, polymer and inorganic chemical agent (a biliquid method) under the ground to form a high-viscosity or solid-phase substance for plugging a water channeling channel, but the chemical plugging agent can generate shearing damage, dilution, temperature change, poor effective mixing of the biliquid and the like in the stratum migration process, so that the underground chemical reaction is insufficient, the strength of a formed plugging product is low, and the plugging effect is poor. On the other hand, the injection process is limited in that the chemical plugging agent enters the main water flow dominant channel by the low-displacement injection process, and the next-stage water flow dominant channel is not plugged, so that after the main water flow dominant channel is plugged, the next-stage water flow dominant channel is quickly developed into the main water flow dominant channel, and the water plugging operation is invalid.
Therefore, in order to improve the water control and oil increasing effects and prolong the water control effective period, it is highly desirable to provide a water control process method and system for modifying the seepage field of an oil reservoir, so as to solve the technical problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention provides a method, a system and an application of a water control process for oil reservoir seepage field transformation, which are mainly applicable to water control for medium-high permeability sandstone oil reservoir seepage field transformation and are an attack type water shutoff operation mode.
A water control process method for modifying an oil reservoir seepage field, wherein the process method comprises a two-step process method or a one-step process method;
the two-step process method comprises large pore canal plugging operation and seepage field reconstruction operation;
The large pore canal plugging operation comprises a large pore canal plugging slug and a large pore canal plugging process;
the seepage field transformation operation comprises a seepage field transformation slug and a seepage field transformation process.
Further, the method comprises the steps of,
The one-step process method comprises a slug design and fracturing process;
the slug design comprises a protection slug, a large pore canal plugging slug and a seepage field reconstruction slug;
the fracturing process is specifically used for completing injection of the protection slug, the large pore canal plugging slug and the seepage field reconstruction slug.
Further, the method comprises the steps of,
The large pore canal plugging slug in the large pore canal plugging operation of the two-step process method comprises the steps of preparing an aqueous solution with a certain concentration by adopting a plugging agent according to physical property characteristics and pore throat distribution characteristics of a reservoir layer, namely preparing the large pore canal plugging slug;
The plugging agent comprises inorganic mineral polymer, high-strength gel or jelly.
Further, the method comprises the steps of,
The seepage field reconstruction slug in the seepage field reconstruction operation of the two-step process method specifically comprises a main slug and a tail chase slug;
according to the distribution characteristics of stratum pore throats, quartz sand, ceramsite or water control filler with certain particle size is selected according to an unsteady ideal filling theory, the quartz sand, ceramsite or water control filler is mixed with sand-carrying fluid, and the permeability of the piled-up slugs is lower than that of the original stratum;
the tail chasing slug is formed by mixing sand or precoated sand with 30-50 meshes or 40-60 meshes with sand-carrying fluid according to the permeability characteristics of the stratum, and the permeability of the slug formed after accumulation is higher than that of the original stratum;
the particle size of the water control filler is matched with that of quartz sand or ceramsite.
Further, the method comprises the steps of,
The permeability of the slugs formed after the accumulation of the main slugs is 40% -80% of the permeability of the original stratum;
The permeability of the slugs formed after the tail slug is piled up is 3-5 times of the permeability of the original stratum;
The water control filler is a selective chemical plugging agent with double control of temperature and crude oil, and comprises oil-soluble resin, paraffin, polyethylene wax or modified slow-expansion particles.
Further, the sand-carrying fluid is a high-viscosity cutting fluid with sand-carrying capacity prepared by dissolving hydroxypropyl guar in water.
Further, the large pore canal plugging process of the two-step process method comprises the steps of injecting large pore canal plugging slugs into a stratum by adopting a pump truck.
The seepage field reconstruction process of the two-step process method comprises the steps of injecting seepage field reconstruction slugs into artificial cracks and near-wellbore zones formed by fracturing by adopting a fracturing truck set to form a filling area with oil-water permeability difference.
Further, the method comprises the steps of,
The protection slug in the one-step process method is specifically formed by mixing water control filler selected according to the diameter of the pore throat of the stratum matrix and the diameter of a large pore canal with sand-carrying fluid.
Further, the method comprises the steps of,
The large pore canal plugging slug in the one-step process method is characterized in that a particle plugging agent or an underground crosslinking chemical plugging agent with the particle diameter larger than the pore throat of a matrix and smaller than the diameter of the large pore canal is added into sand-carrying fluid or water, and the large pore canal plugging slug is formed by uniformly stirring;
The chemical plugging agent comprises slow-expansion particles, inorganic mineral polymers, high-strength gel or jelly or resin plugging agent.
Further, the method comprises the steps of,
The seepage field reconstruction slug in the one-step process method is the same as the seepage field reconstruction slug in the two-step process method.
The invention also provides a water control process system for modifying the oil reservoir seepage field, wherein the process system comprises a two-step process system or a one-step process system;
the two-step process system comprises a large pore canal plugging operation unit and a seepage field transformation operation unit;
the large pore canal plugging operation unit comprises a large pore canal plugging slug and a large pore canal plugging process;
The seepage field transformation operation unit comprises a seepage field transformation slug and a seepage field transformation process.
Further, the one-step system method comprises a slug design unit and a fracturing process unit;
the slug design unit is used for generating a protection slug, a large pore canal plugging slug and a seepage field reconstruction slug;
the fracturing process unit is used for completing injection of the protection slugs, the large pore canal plugging slugs and the seepage field reconstruction slugs by adopting a fracturing process.
Further, the process method is applied to reconstruction and water control of a seepage field of the medium-high permeability sandstone reservoir.
Further, the process system is applied to reconstruction and water control of a seepage field of a medium-high permeability sandstone reservoir.
The oil reservoir seepage field reconstruction water control process method organically combines the conventional chemical water shutoff and fracturing processes, and provides a seepage field reconstruction water control technology which adopts the fracturing process to provide effective technological measure guarantee for the injection of chemical plugging agents, the selection range of the chemical plugging agents is widened, the synergistic effect of different chemical plugging agents is exerted, the seepage field of the stratum near the shaft is changed, the purposes of controlling water and increasing oil are realized, the water control effect is improved, the transformation range is wide, and the water control effective period is prolonged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and other advantages of the invention are obtained from the description and the claims.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a water control process method for oil reservoir seepage field reconstruction, which adopts the technical principle that seepage field reconstruction is carried out on different water flooded areas in a medium-high permeability sandstone reservoir with obvious in-layer permeability difference, so that a water flooding flow channel is changed, water flooding wave and volume are improved, and the purpose of controlling water and increasing oil is realized. The process method comprises a two-step process method or a one-step process method;
the two-step process method comprises large pore canal plugging operation and seepage field reconstruction operation;
The large pore canal plugging operation comprises a large pore canal plugging slug and a large pore canal plugging process;
the seepage field transformation operation comprises a seepage field transformation slug and a seepage field transformation process.
The one-step process method comprises a slug design and fracturing process;
the slug design comprises a protection slug, a large pore canal plugging slug and a seepage field reconstruction slug;
the fracturing process is specifically used for completing injection of the protection slug, the large pore canal plugging slug and the seepage field reconstruction slug.
According to physical property characteristics and pore throat distribution characteristics of a reservoir, inorganic mineral polymer, high-strength gel or jelly is adopted as a plugging agent to prepare an aqueous solution with a certain concentration, namely the large pore canal plugging slug is prepared;
The plugging agent such as inorganic mineral polymer, high-strength gel or jelly is injected into the stratum, and the plugging agent is selectively injected into the large pore channels or dominant water flow channels in a low-displacement injection mode (when a low-displacement injection process is adopted, plugging slug fluid naturally selects the large pore channels or dominant water flow channels with the minimum flow resistance for plugging), so that the strong water flooded area is plugged, the dominant water flow channels are thoroughly plugged, and the flow track of water is forced to be thoroughly changed.
The inorganic mineral polymer, high-strength gel or jelly and other chemical plugging materials have larger viscosity, poorer fluidity, higher permeability and higher plugging rate, and the residual resistance coefficient after plugging is increased along with the increase of the water injection speed, and has a better double logarithmic relationship. In addition, experiments show that the plugging and flooding dual effects of plugging and flooding can be obtained by combining the dominant channel plugging technology of inorganic mineral polymers, gel or jelly with the chemical profile control and flooding technology, the oil and water flooding effect is more obvious, and the sweep area is increased and the recovery ratio is increased after the time for the flooding agent and water entering the matrix parts of the low permeable layer and the high permeable layer to return to large pore channels is prolonged along with the increase of the plugging distance. Therefore, the chemical material is injected into the stratum to plug large pore channels or dominant water flow channels and provide for subsequent modification of the seepage field.
The seepage field reconstruction slug comprises a main slug and a tail slug, wherein the main slug is characterized in that quartz sand or ceramsite with certain particle size and water control filler (the particle size of the water control filler is matched with that of the quartz sand or ceramsite) are selected according to the distribution characteristics of stratum pore throats and the ideal filling theory, so that the permeability of the piled up slugs is 40-80% of that of the original stratum, the particle size selection and the water control filler addition proportion are determined according to the permeability value of an indoor sand filling pipe, and the water control filler comprises oil soluble resin, paraffin, polyethylene wax or modified slow-expansion particles.
The tail chase slug is a post slug formed by mixing sand-carrying fluid with 30-50 or 40-60 mesh sand or precoated sand, and the slug forms a filling zone with higher permeability than stratum permeability after being filled in a near-wellbore zone, so that the oil drainage capacity is improved.
The sand-carrying fluid is a high-viscosity cutting fluid with sand-carrying capacity, which is prepared by dissolving hydroxypropyl guar in water.
The large pore canal plugging process of the two-step process method comprises the steps of injecting large pore canal plugging slugs into a stratum by adopting a pump truck. The construction discharge capacity is 0.2-1.0m 3/min, the wellhead pressure is 2-15MPa, and the plugging radius is 50-80m. The purpose is to carry out strong shutoff to big pore or rivers dominant channel, forces water to change flow direction to increase the water wave and volume, improve water drive efficiency.
The seepage field reconstruction process of the two-step process method comprises the steps of injecting seepage field reconstruction slugs into artificial cracks and near-wellbore zones formed by fracturing by adopting a fracturing truck set to form a filling area with oil-water permeability difference. The construction discharge capacity is 2.5-4m 3/min, the construction pressure is 15-36MPa, and the average sand ratio is 20-40%. The construction method aims at adopting a fracturing process method to press an artificial crack in a weak water flooded area and a non-water flooded area, filling a seepage field reconstruction slug into the artificial crack and a near-wellbore area under the carrying of sand-carrying fluid to form a reconstruction area with oil-water differential permeability, and realizing the purposes of controlling water and increasing oil.
The protective slug in the one-step process method is specifically a water-plugging and oil-plugging-free selective plugging material (namely water-controlling filler) with proper particle size distribution according to the pore throat diameter and the large pore diameter of a stratum matrix, and comprises oil-soluble resin, asphalt, paraffin, polyethylene wax and the like, wherein a protective layer similar to a mud cake is formed on a residual oil enrichment zone, so that pollution caused by the subsequent invasion of a chemical plugging agent into pores of the matrix is prevented, and the residual oil is not beneficial to the digging and submerging of the residual oil. Meanwhile, the plugging agents also play a role in reducing the liquid filtration loss, improving the liquid seam making efficiency and expanding the transformation range. And adding the optimized selective plugging material into sand-carrying fluid, and uniformly mixing to form a protection slug.
The large pore canal plugging slug is characterized in that a particle plugging agent or an underground crosslinking chemical plugging agent with the particle diameter larger than the diameter of the pore throat of a substrate and smaller than the diameter of the large pore canal is selected to strongly plug the large pore canal, and the pollution of the chemical plugging agent to a residual oil enrichment zone is prevented by adopting an over-displacement mode. Suitable chemical plugging agents include, but are not limited to, swelling-slowing particles, inorganic mineral polymers, high strength gels, phenolic resins, urea formaldehyde resins, and the like. And (3) adding the preferable plugging agent into sand-carrying fluid or water, and uniformly stirring to form the large-pore plugging slug.
The seepage field reconstruction slug designed in the one-step process method is the same as the method in the two-step process method.
The method comprises the steps of filling a protective slug, a large pore canal plugging slug and a seepage field reconstruction slug into three slugs by adopting a fracturing process, protecting a residual oil enrichment area, plugging a large pore canal or a water flow dominant channel at the front edge of an artificial crack, reducing the filtration loss, increasing the seam width as much as possible, expanding the seepage field reconstruction range, filling the artificial crack formed by the next-stage water flow dominant channel and the residual oil enrichment area to form an oil-water differential seepage field, realizing a water control and oil increase target, and selectively performing sand prevention operation according to the sand production condition of a stratum.
Compared with the traditional chemical water shutoff, the invention has the advantages of wide transformation range, long effective period and obvious oil increasing effect. The invention has the innovation points that firstly, the process innovation abandons the traditional low-displacement injection process of chemical water shutoff, and the fracturing process is adopted, so that the water control can be realized, the oil increasing effect is realized, and the aggressiveness of water control measures is improved. And secondly, the flow state of underground crude oil is changed. The middle-high permeability sandstone reservoir is fractured to form short and wide vertical cracks, a crack is established in the residual oil enrichment zone, seepage of crude oil is converted into double-wing linear flow, oil flow resistance is greatly reduced, the residual oil is facilitated to be submerged, and the final recovery ratio is improved. Thirdly, constructing a differential permeation field. By applying the 'unsteady state' ideal filling theory, quartz sand or ceramsite with specific particle size distribution and water control particle filler are mixed according to a certain proportion and then filled into a crack, so that the water phase permeability of the crack filler is 40% -80% of the water phase permeability of an original stratum, the oil phase permeability is improved by more than 3 times of the original oil phase permeability of a residual oil enrichment zone by utilizing the characteristic of water control filler 'water shutoff and oil drainage', the construction of an oil-water differential seepage field in the crack filler is realized, water is forced to enter a matrix for oil displacement, and crude oil quickly enters an oil well along a crack, so that the water control and oil increase purposes are realized. The water control filler is a selective chemical plugging agent with dual control of temperature and crude oil, comprises oil-soluble resin, paraffin, polyethylene wax, modified slow expansion particles and other materials, can be freely selected according to the stratum temperature, realizes the differentiation of accurately controlling the oil-water permeability, and is an important guarantee for realizing the construction of differential permeability.
The invention also provides a water control process system for modifying the oil reservoir seepage field, which comprises the following steps:
The process system comprises a two-step process system or a one-step process system;
The two-step process system comprises a large pore canal plugging operation unit and a seepage field transformation operation unit, wherein the large pore canal plugging operation unit comprises a large pore canal plugging slug and a large pore canal plugging process, and the seepage field transformation operation unit comprises a seepage field transformation slug and a seepage field transformation process.
The one-step method system method comprises a slug design unit and a fracturing process unit;
the fracturing process unit specifically adopts a fracturing process to complete injection of the protection slug, the large-pore-canal plugging slug and the seepage field reconstruction slug.
The oil reservoir seepage field reconstruction water control process method and system provided by the invention are mainly suitable for reconstruction water control of the medium-high permeability sandstone oil reservoir seepage field, and can enable the oil well in the medium-high water-containing period to reduce water and increase oil, thereby improving the recovery ratio.
Example 1 two-stage Process
In a certain middle-high permeability strong side water sandstone oil reservoir, the thickness of an oil layer is 5m, the total development of natural energy development, water injection development and CO 2 throughput is 27 years, water injection and side water long-term flushing form a water flow dominant channel and a large pore canal, and water or gas directly protrudes into an oil well along the large pore canal, so that ineffective water injection or gas injection development is caused. Aiming at the oil reservoir, the seepage field transformation water control process method disclosed by the embodiment of the invention is adopted for operation.
And plugging large pore canals. The water flow dominant channel and the large pore canal are blocked by adopting a common pump truck to squeeze 170m 3 inorganic mineral polymer plugging agent system. The formula of the plugging agent system comprises 80% of water, 20% of inorganic mineral polymer and 3% of catalyst, the discharge capacity is 0.6m 3/min, the injection pressure is 10-14.8MPa, and the next operation is carried out after waiting for 15 h.
And (3) modifying the seepage field. Preparing a 175m 3 main slug according to a formula of 0.3% of guar gum, 40% to 70 meshes of powder sand and 10% of oil-soluble plugging agent, preparing a 10m 3 tail slug according to a formula of water, 0.3% of guar gum, 20% to 30% of 20-40 meshes of precoated sand, and sequentially injecting the main slug and the tail slug into a stratum by adopting a fracturing truck set, wherein the construction displacement is 2.7 to 4.0m 3/min, and the construction pressure is 21 to 35.6MPa.
After the construction is finished, the well is closed for 1 day, and (5) putting the oil well into production.
Screw pump well completion under 2019 12 month 15 days, 37 parts of initial daily oil production, 5.1 tons of daily oil production, 11.2 tons of highest daily oil production, 32.9 parts of current daily oil production, 8.04 tons of daily oil production and 78 percent of water content, and up to 2021 month 5 and 10 days, the accumulated oil increase of 3232 tons and the accumulated effective period of 492 days.
Example 2A one-step process was used
Some medium-high permeability sandstone oil reservoir, the buried depth is 2700-3200m, the average porosity is 19.5%, the average permeability is 265 x 10 - 3um2, the thickness of a main oil layer is 35.6m, water injection is carried out for 13 years, injected water is injected into an oil well along the bottom of the oil reservoir, and the oil well is shut in with high water content. Aiming at the oil reservoir, the one-step construction process of the seepage field reconstruction water control process method is adopted for construction operation.
Construction displacement is 2.2-5.5m 3/min, construction pressure is 30-65.0MPa, reservoir protection slug is 120m 3 (water+0.3% guar gum+15% water control particle material of 5-10 um), large pore plugging slug is 200m 3 (water+20% high strength gel), seepage field reconstruction slug is 80m 3 (0.3% guar gum+20-40% 40-70 mesh powder sand+10% oil soluble plugging agent), 40-70 mesh/30-50 mesh quartz sand is 35m 3, high strength gel is 40m 3, water control material is 18m 3, and oil soluble plugging agent is 8m 3 are added in an accumulated mode.
And after the construction is finished, closing the well for 1 day, discharging liquid and producing.
The invention provides a water control process method suitable for the modification of a high water-cut period oil reservoir seepage field of a medium-high permeability sandstone oil reservoir, which applies a fracturing process innovation to the medium-high permeability sandstone oil reservoir, because the stratum is loose, short and wide vertical seams are easy to form in fracturing, vertical residual oil can be communicated, an oil flow channel is changed from seepage into linear flow, and the oil flow resistance is greatly reduced. Meanwhile, due to the application of the fracturing technology, the selection of the chemical plugging agent is wider, and the limitation of the conventional low-displacement injection mode on the selection of the chemical plugging agent is avoided, for example, the granular chemical plugging agent is difficult to move deeply in the stratum under the low-displacement injection, so that the granular chemical plugging agent cannot be used in the conventional chemical plugging operation, or has higher requirements on the particle size and the particle deformability of the granules. However, the method of injecting the plugging agent in the fracturing process makes the injection of the chemical plugging agent relatively easy, and any type of chemical plugging agent can be selected according to the water control requirement, thereby being more beneficial to the success of chemical plugging. And by designing the crack filling material, a seepage field with oil-water differential permeability is formed in the crack, the water phase permeability is reduced, and the oil phase permeability is improved, so that the purposes of controlling water and increasing oil are realized. The invention is suitable for the treatment of a water injection single-layer sudden inflow (flooding) layer and is also suitable for the treatment of a high-water-content oil well with strong bottom water propelled along a local hypertonic strip. By reconstructing seepage field of different water flooded areas in the medium-high seepage sandstone reservoir with large interlayer or in-layer permeability difference, the water drive flow channel is changed, the water drive wave and volume are improved, and the purpose of controlling water and increasing oil is realized.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications may be made to the technical solutions described in the foregoing embodiments or equivalents may be substituted for some of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention in essence of the corresponding technical solutions.
Claims (11)
1. A water control process method for oil reservoir seepage field transformation is characterized in that,
The process method comprises a two-step process method or a one-step process method;
The one-step process method comprises a slug design and a fracturing process, wherein the slug design comprises a protection slug, a large pore canal plugging slug and a seepage field reconstruction slug;
the two-step process method comprises large pore canal plugging operation and seepage field reconstruction operation;
The large pore canal plugging operation comprises a large pore canal plugging slug and a large pore canal plugging process;
The seepage field transformation operation comprises a seepage field transformation slug and a seepage field transformation process;
The seepage field reconstruction slug in the one-step process method is the same as the seepage field reconstruction slug in the two-step process method, and specifically comprises a main slug and a tail chase slug;
according to the distribution characteristics of stratum pore throats, quartz sand or ceramsite with certain particle size and water control filler are selected according to an unsteady ideal filling theory, the quartz sand or ceramsite and water control filler are mixed with sand-carrying fluid, and the permeability of the piled-up slugs is lower than that of the original stratum;
The tail chasing slug is formed by mixing sand with 30-50 meshes or 40-60 meshes with sand-carrying fluid according to the permeability characteristics of the stratum, and the permeability of the piled slug is higher than that of the original stratum;
the particle size of the water control filler is matched with that of quartz sand or ceramsite.
2. The oil reservoir seepage field reconstruction water control process method according to claim 1, wherein,
The fracturing process is specifically used for completing injection of the protection slug, the large pore canal plugging slug and the seepage field reconstruction slug.
3. The oil reservoir seepage field reconstruction water control process method according to claim 1, wherein,
The large pore canal plugging slug in the large pore canal plugging operation of the two-step process method comprises the steps of preparing an aqueous solution with a certain concentration by adopting a plugging agent according to physical property characteristics and pore throat distribution characteristics of a reservoir layer, namely preparing the large pore canal plugging slug;
The plugging agent comprises inorganic mineral polymer, high-strength gel or jelly.
4. The oil reservoir seepage field reconstruction water control process method according to claim 1, wherein,
The permeability of the slugs formed after the accumulation of the main slugs is 40% -80% of the permeability of the original stratum;
The permeability of the slugs formed after the tail slug is piled up is 3-5 times of the permeability of the original stratum;
The water control filler is a selective chemical plugging agent with double control of temperature and crude oil, and comprises oil-soluble resin, paraffin, polyethylene wax or modified slow-expansion particles.
5. The oil reservoir seepage field reconstruction water control process method according to claim 1, wherein,
The sand-carrying fluid is a high-viscosity cutting fluid with sand-carrying capacity, which is prepared by dissolving hydroxypropyl guar in water.
6. The oil deposit seepage field reconstruction water control process method as claimed in claim 3, wherein,
The large pore canal plugging process of the two-step process method comprises the steps of injecting large pore canal plugging slugs into a stratum by adopting a pump truck.
7. The oil reservoir seepage field reconstruction water control process method according to claim 1, wherein,
The seepage field reconstruction process of the two-step process method comprises the steps of injecting seepage field reconstruction slugs into artificial cracks and near-wellbore zones formed by fracturing by adopting a fracturing truck set to form a filling area with oil-water permeability difference.
8. The oil reservoir seepage field reconstruction water control process method according to claim 2, wherein,
The protection slug in the one-step process method is specifically formed by mixing water control filler selected according to the diameter of the pore throat of the stratum matrix and the diameter of a large pore canal with sand-carrying fluid.
9. The oil reservoir seepage field reconstruction water control process method according to claim 2, wherein,
The large-pore-channel plugging slug in the one-step process method is characterized in that an underground crosslinking chemical plugging agent with the particle size larger than the pore throat of a matrix and smaller than the diameter of the large pore channel is added into sand-carrying fluid or water and stirred uniformly to form the large-pore-channel plugging slug;
The underground crosslinking chemical plugging agent comprises slow-expansion particles, inorganic mineral polymers, high-strength gel or jelly or resin plugging agent.
10. The oil reservoir seepage field reconstruction water control process method according to claim 2, wherein the large pore canal plugging slug in the one-step process method is specifically formed by adding a particle plugging agent with particle size larger than a matrix pore throat and smaller than the diameter of the large pore canal into sand-carrying fluid or water and stirring uniformly.
11. The application of the oil reservoir seepage field reconstruction water control process method according to any one of the claim 1 to 10, wherein,
The process method is applied to reconstruction and water control of a medium-high permeability sandstone reservoir seepage field.
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| CN1614193A (en) * | 2004-12-01 | 2005-05-11 | 大庆油田有限责任公司 | Fracturing method for improving recovering ratio by phase permeability improver |
| CN110439503A (en) * | 2019-08-14 | 2019-11-12 | 西安石油大学 | A kind of Fractured Low-Permeability Reservoir multistage plug Selective Water Plugging method |
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