CN112253071A - Design method for pretreatment, blockage removal and capacity increase fracturing of compact sandstone reservoir - Google Patents
Design method for pretreatment, blockage removal and capacity increase fracturing of compact sandstone reservoir Download PDFInfo
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- 238000013461 design Methods 0.000 title claims abstract description 24
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
The invention provides a compact sandstone reservoir pretreatment blockage removal and capacity increase fracturing design method, which comprises the following steps: s1, pre-treating the reservoir by using pre-acid to remove the pore filling blockage; s2, carrying out compatibilization modification on the reservoir by adopting slickwater: and S3, performing fracturing modification construction by adopting large construction displacement. The method uses the preposed acid pretreatment to remove filling damage in pores, improves the pore connectivity and permeability of the reservoir, adopts a small-displacement injection low-damage slickwater system to increase the capacity of the reservoir, improves the formation pressure coefficient, forms certain tensile fatigue on rocks, reduces the tensile stress of the reservoir rocks during pressure modification, finally carries out larger-scale fracturing modification, improves the modification volume of the reservoir, and forms a more complex fracture system.
Description
Technical Field
The invention relates to the technical field of oil and gas field fracturing, in particular to a design method for pretreatment plugging removal and capacity increase fracturing of a compact sandstone reservoir.
Background
Because of the characteristics of low porosity, low permeability, large physical property difference, large horizontal sand body distribution and thickness change and the like of the compact sandstone reservoir, the conventional fracturing only focuses on improving the form and size of the fracture, and the plugging removal measures for the pores of the reservoir are insufficient; and the conventional fracturing mainly forms a single tensile fracture, the fracture is single in shape, and the modification volume is limited.
For example, chinese patent CN104695934B discloses a method for optimizing a tight sandstone gas reservoir development well pattern, which determines the length and width of an effective sand body through fine dissection of the sand body, establishes a geological model, collects inter-well interference data, performs numerical simulation, considers economic conditions at the same time, and finally determines a reasonable gas reservoir development well pattern. The method has the advantages that geological requirements, economic conditions and highest recovery expectation are integrated, and the recovery efficiency of the gas field is effectively improved under the current economic and technical conditions. However, with the continuous and deep research of geology and gas reservoir engineering, the impact factors of pressure waves and ranges of tight sandstone reservoirs are complex, the recovery ratio is obviously influenced by the water saturation and the permeability of the reservoirs, and a basic model established only by effective sand body scale cannot truly reflect the reservoir utilization conditions, so that the well pattern obtained by the method has limitations.
Disclosure of Invention
The invention overcomes the defects of the conventional fracturing technology, and provides a pretreatment plugging removal and capacity increase fracturing design method for a compact sandstone reservoir, so that the modified reservoir has better pore connectivity, higher formation pressure, wider modification volume and a more complex fracture system.
Therefore, the invention adopts the following technical scheme:
a pretreatment blockage removal and capacity increase fracturing design method for a tight sandstone reservoir comprises the following steps:
s1, pre-treating the reservoir by using pre-acid to remove the pore filling blockage; so as to reduce the friction resistance of the hole and the fracture pressure of the near-well stratum and facilitate the subsequent steps;
s2, carrying out capacity increasing transformation on the reservoir by adopting slickwater;
s3, fracturing modification construction is carried out by adopting large discharge capacity;
and S4, closing the well and open flow.
Further, the specific method for pretreating the reservoir by using the pre-acid in S1 is as follows: calculating the using amount of acid liquor, preparing the needed using amount of pre-acid, and then adopting an oil pipe to inject the pre-acid into the construction, wherein the construction discharge capacity is 1.0-2.0m3And min, wherein the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe.
Further, the preposed acid comprises the following components in percentage by mass: 10-20% of hydrochloric acid, 0.4-1.0% of formic acid, 0.5-2.0% of acetic acid, 0.1-0.2% of citric acid, 1-2.5% of corrosion inhibitor and the balance of water.
Further, the acid liquor usage is calculated according to the reservoir transformation radius, the reservoir thickness and the porosity.
Specifically, the formula for calculating the acid liquor dosage is as follows:
vamount of acid＝πR2×h×φ×10-3÷2
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
h is the effective thickness of the reservoir;
phi is the reservoir effective porosity.
Further, the specific method for performing compatibilization modification on the reservoir by using slickwater in S2 is as follows: calculating the using amount of slickwater, and then adopting an oil pipe to inject into the construction, wherein the construction displacement is 2-3 m3And min, wherein the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe.
Further, the slickwater consists of the following components in percentage by mass: 0.05-0.10% of drag reducer, 0.2-0.6% of waterproof locking agent, 0.2-0.6% of clay stabilizer and the balance of water.
Further, the slickwater consumption is calculated according to the reservoir transformation radius, the reservoir thickness and the porosity.
Specifically, the calculation formula of the slickwater consumption is as follows:
vamount of slipstream＝πR2×h×10-3÷4
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
and h is the effective thickness of the reservoir.
Further, the determination method of the large discharge capacity when the fracturing reformation construction is carried out by the large discharge capacity of the S3 is as follows: firstly, determining the height and the length of a crack by simulation calculation of fracture analysis software according to single well logging information, adjacent well reconstruction parameters and gas testing effects; determining the propping agent amount, construction discharge capacity, average sand ratio and construction liquid amount of the fracturing modification according to the modified fracture form; and then obtaining the maximum construction displacement under the conditions of seam height control and wellhead pressure limiting.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the method removes filling damage in pores by using pre-acid pretreatment, improves the pore connectivity and permeability of the reservoir, adopts a small-displacement injection low-damage slickwater system to increase the capacity of the reservoir, improves the formation pressure coefficient, forms certain tensile fatigue on rocks, reduces the tensile stress of the reservoir rocks during pressure modification, finally carries out larger-scale fracturing modification, improves the modification volume of the reservoir, and forms a more complex fracture system.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, which are provided for a complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1
Conventional fracturing suffers from the following two drawbacks:
1) conventional fracturing only focuses on improving the form and size of a fracture, and plugging removal measures for reservoir pores are insufficient;
2) the conventional fracturing mainly forms a single tensile fracture, the fracture is single in shape, and the reconstruction volume is limited.
Based on this, the embodiment provides a tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method, which includes the following steps:
s1, selecting preposed acid to pretreat the reservoir, removing the filler blockage in the pores, and improving the pore connectivity and permeability;
s2, performing compatibilization treatment on the modified reservoir by adopting slickwater to prepare for realizing complex cracks and various cracks for fracturing modification;
s3, fracturing modification construction is carried out by adopting large discharge capacity, the modification volume is increased, and complex cracks are formed;
and S4, closing the well and open flow.
The method adopts the pretreatment of the preposed acid to remove the filling damage in the pores and improve the pore connectivity and permeability of the reservoir; the small-displacement injection low-damage slickwater system is adopted to increase the capacity of the reservoir, the formation pressure coefficient is improved, meanwhile, certain tensile fatigue is formed on the rock, and the tensile stress of the reservoir rock during pressure modification is reduced; and the large-scale deep fracturing modification is adopted, the modification volume of the reservoir is improved, and a complex fracture system is formed. The compact sandstone reservoir pretreatment blockage removal and capacity increase fracturing design method is suitable for compact sandstone reservoirs with high pore filling degree and high clay mineral content.
Example 2
The embodiment provides a tight sandstone reservoir pretreatment blockage removal capacity-increasing fracturing design method, which comprises the following steps:
s1, pre-treating a reservoir by using pre-acid to remove pore filling blockage, wherein the method comprises the following specific steps: calculating the consumption of the pre-acid solution, preparing the pre-acid with the required consumption, and then adopting an oil pipe to inject the pre-acid solution into the pre-acid solution for construction, wherein the construction discharge capacity is 1.0-2.0m3Min, the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe;
s2, carrying out capacity-increasing transformation on the reservoir by adopting slickwater, wherein the specific method comprises the following steps: calculating the using amount of slickwater, then adopting an oil pipe for injection construction, and replacing the preposed acid to the position of the perforation hole by the slickwater, so that the perforation hole and the near wellbore area are fully soaked by the preposed acid; it needs to be further explained that the construction discharge capacity of the slickwater is 2-3 m3Min, the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe;
s3, designing fracturing modification parameters by adopting a conventional method, wherein the parameters comprise sand amount, sand ratio, construction discharge capacity and the like, and in order to improve the modification effect, the construction discharge capacity and the sand ratio are larger; it should be further explained that the method for determining the large discharge amount is as follows: firstly, determining the height and the length of a crack by simulation calculation of fracture analysis software according to single well logging information, adjacent well reconstruction parameters and gas testing effects; determining the propping agent amount, construction discharge capacity, average sand ratio and construction liquid amount of the fracturing modification according to the modified fracture form; then obtaining the maximum construction displacement under the conditions of seam height control and wellhead pressure limiting;
and S4, closing the well and releasing the blowout.
Because the pore filling degree of the compact sandstone reservoir is higher, the invention uses the pretreatment of the preposed acid to remove fillers, communicate pore channels of the reservoir and reduce the fracture pressure during the fracturing construction.
Example 3
On the basis of the above embodiment, further, the usage amount of the pre-acid solution is calculated according to the radius of reservoir reformation, the reservoir thickness and the porosity, and the specific calculation formula is as follows:
vamount of acid＝πR2×h×φ×10-3÷2
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
h is the effective thickness of the reservoir;
phi is the reservoir effective porosity.
Further, the preposed acid comprises the following components in percentage by mass: 10-20% of hydrochloric acid, 0.4-1.0% of formic acid, 0.5-2.0% of acetic acid, 0.1-0.2% of citric acid, 1-2.5% of corrosion inhibitor and the balance of water. Specifically, the corrosion inhibitor is HJF-94 corrosion inhibitor produced by Changqing oilfield branch downhole assistant factory.
The preposed acid has the following advantages:
(1) the acid liquor has better compatibility with the stratum and does not generate acid-sensitive reaction with the reservoir;
(2) the acid liquor reacts with the reservoir pore filling to realize better recovery of the porosity, and no new precipitate is generated in the reaction.
After the reservoir is pretreated by adopting the preposed acid, the blockage of a pore throat channel of a stratum is removed, so that the water injection quantity is improved, the water injection pressure is reduced, and the oil gas recovery efficiency is effectively improved; compared with the conventional acidification process, the method is more environment-friendly and safer, and provides a safe operating condition for people, equipment and the environment.
Example 4
On the basis of the above embodiment, further, the slickwater usage is calculated according to the reservoir transformation radius, the reservoir thickness and the porosity, and the specific calculation formula is as follows:
vamount of slipstream＝πR2×h×10-3÷4
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
and h is the effective thickness of the reservoir.
Further, the slickwater has good compatibility with the stratum and does not react with the reservoir layer sensitively, and based on the characteristics, the slickwater consists of the following components in percentage by mass: 0.05-0.10% of drag reducer, 0.2-0.6% of waterproof locking agent, 0.2-0.6% of clay stabilizer and the balance of water. Specifically, the drag reducer, the waterproof locking agent and the clay stabilizer are respectively EM60 drag reducer, TGF-3 waterproof locking agent and COP-2 clay stabilizer produced by underground auxiliary agent factories of Changqing oil field division companies.
Example 5:
for a certain reservoir of a C well, determining the half-year reconstructed fracture to be 220m, the effective thickness of the reservoir to be 11m and the effective porosity to be 8% according to the well spacing, and adopting the design method for the pretreatment, blockage removal and capacity increase fracturing of the tight sandstone reservoir, which comprises the following steps:
the method comprises the following steps: pre-treating the reservoir by using pre-acid to remove pore filling blockage;
the preposed acid comprises the following components in percentage by mass: 18% of hydrochloric acid, 0.8% of formic acid, 1.5% of acetic acid, 0.2% of citric acid, 2.0% of HJF-94 corrosion inhibitor and 77.5% of water, wherein the acid solution has better compatibility with the stratum, and reacts with reservoir pore fillers without generating new precipitates;
the consumption of the preposed acid is calculated according to the radius of reservoir transformation, the thickness of the reservoir and the porosity, and the formula is as follows:
vamount of acid＝πR2×h×φ×10-3÷2＝3.14×2202×11×8×10-2×10-3÷2＝67(m3)
πR2For modifying the radius (i.e. half the length of the crack)) The corresponding circumferential area;
h is the effective thickness of the reservoir;
phi is the effective porosity of the reservoir;
the construction discharge capacity of the preposed acid injection is 1.0-2.0m3/min；
Step two: carrying out capacity-increasing transformation on the reservoir by adopting slickwater:
the slickwater has better compatibility with the stratum and does not have sensitive reaction with the reservoir; specifically, the slickwater is a low-viscosity fracturing fluid system, and the formula of the slickwater is 0.10% of EM60 drag reducer, 0.4% of TGF-3 waterproof locking agent, 0.4% of COP-2 clay stabilizer and 99.1% of water.
The using amount of the slickwater is calculated according to the radius of reservoir transformation, the thickness of the reservoir and the porosity, and the formula is as follows:
vamount of slipstream＝πR2×h×10-3÷4＝3.14×2202×11×10-3÷4＝418(m3)
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
h is the effective thickness of the reservoir;
the construction discharge capacity of the slickwater injection is 1.0-2.0m3/min。
Step three: adopt great construction discharge capacity to carry out fracturing transformation construction, specifically do:
(1) designing fracturing modification parameters by a conventional method, wherein the parameters comprise 50-square sand amount, 20% sand ratio and 4.0-square/minute construction discharge capacity;
(2) designing a construction pump sequence and fracturing construction.
In conclusion, the method adopts pretreatment of the preposed acid to remove filling damage in pores and improve the connectivity and permeability of the pores of the reservoir; (2) the small-displacement injection low-damage slickwater system is adopted to increase the capacity of the reservoir, the formation pressure coefficient is improved, meanwhile, certain tensile fatigue is formed on the rock, and the tensile stress of the reservoir rock during pressure modification is reduced; (3) and the large-scale deep fracturing modification is adopted, the modification volume of the reservoir is improved, and a complex fracture system is formed.
The construction process not described in detail in this embodiment is well known or commonly used in the industry, and is not described here.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention is within the scope of the claims.
Claims (10)
1. A compact sandstone reservoir pretreatment blockage removal and capacity increase fracturing design method is characterized by comprising the following steps:
s1, pre-treating the reservoir by using pre-acid to remove the pore filling blockage;
s2, carrying out capacity increasing transformation on the reservoir by adopting slickwater;
s3, fracturing modification construction is carried out by adopting large discharge capacity;
and S4, closing the well and open flow.
2. The tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method of claim 1, wherein the S1 adopts a pre-acid to pretreat the reservoir as follows: calculating the using amount of acid liquor, preparing the needed using amount of pre-acid, and then adopting an oil pipe to inject the pre-acid into the construction, wherein the construction discharge capacity is 1.0-2.0m3And min, wherein the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe.
3. The tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method of claim 1, wherein the design method comprises the following steps: the preposed acid comprises the following components in percentage by mass: 10-20% of hydrochloric acid, 0.4-1.0% of formic acid, 0.5-2.0% of acetic acid, 0.1-0.2% of citric acid, 1-2.5% of corrosion inhibitor and the balance of water.
4. The tight sandstone reservoir pretreatment plug-removal capacity-increasing fracturing design method of claim 2, wherein the acid solution dosage is calculated according to a reservoir reconstruction radius, a reservoir thickness and porosity.
5. The tight sandstone reservoir pretreatment plug-removal capacity-increasing fracturing design method of claim 4, wherein the acid liquor dosage calculation formula is as follows:
vamount of acid＝πR2×h×φ×10-3÷2
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
h is the effective thickness of the reservoir;
phi is the reservoir effective porosity.
6. The tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method of claim 1, wherein the S2 method for performing capacity-increasing transformation on the reservoir by using slickwater comprises the following specific steps: calculating the using amount of slickwater, and then adopting an oil pipe to inject into the construction, wherein the construction displacement is 2-3 m3And min, wherein the construction pressure is lower than the safe internal pressure resistance pressure of the oil pipe.
7. The tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method of claim 1, wherein the design method comprises the following steps: the slick water comprises the following components in percentage by mass: 0.05-0.10% of drag reducer, 0.2-0.6% of waterproof locking agent, 0.2-0.6% of clay stabilizer and the balance of water.
8. The tight sandstone reservoir pretreatment plug-removal capacity-increasing fracturing design method of claim 6, wherein the slickwater dosage is calculated according to a reservoir reconstruction radius, a reservoir thickness and porosity.
9. The tight sandstone reservoir pretreatment plug-removal capacity-increasing fracturing design method of claim 8, wherein the slickwater dosage calculation formula is as follows:
vamount of slipstream＝πR2×h×10-3÷4
πR2In order to improve the circumferential area corresponding to the radius (namely the half length of the crack);
and h is the effective thickness of the reservoir.
10. The tight sandstone reservoir pretreatment plug removal capacity-increasing fracturing design method of claim 1, wherein the design method comprises the following steps: the method for determining the large discharge capacity when the S3 fracturing modification construction is carried out by adopting the large discharge capacity comprises the following steps: firstly, determining the height and the length of a crack by simulation calculation of fracture analysis software according to single well logging information, adjacent well reconstruction parameters and gas testing effects; determining the propping agent amount, construction discharge capacity, average sand ratio and construction liquid amount of the fracturing modification according to the modified fracture form; and then obtaining the maximum construction displacement under the conditions of seam height control and wellhead pressure limiting.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780246A (en) * | 2021-02-28 | 2021-05-11 | 西南石油大学 | Organic acid solution treatment method for enhancing and maintaining flow conductivity of tight sandstone reservoir fracture |
| CN114991738A (en) * | 2021-03-01 | 2022-09-02 | 中国石油天然气股份有限公司 | Sandstone reservoir composite transformation method |
| CN115434680A (en) * | 2021-06-03 | 2022-12-06 | 中国石油天然气股份有限公司 | Gas well reservoir transformation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545324A (en) * | 2015-09-18 | 2017-03-29 | 中国石油化工股份有限公司 | A kind of method for pressing off the multiple horizontal bedding seams of shale gas |
| CN106567701A (en) * | 2015-10-09 | 2017-04-19 | 中国石油化工股份有限公司 | Hydraulic fracturing method |
| CN106958438A (en) * | 2017-02-20 | 2017-07-18 | 中国石油化工股份有限公司 | A kind of polymer flooding blocks the method for removing blockage of well |
| WO2018032086A1 (en) * | 2016-08-18 | 2018-02-22 | Velvet Energy Ltd. | Fracture length increasing method |
| CN110439521A (en) * | 2019-08-05 | 2019-11-12 | 中国石油天然气股份有限公司 | Advanced energy storage fracturing method |
-
2020
- 2020-10-20 CN CN202011125098.5A patent/CN112253071A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106545324A (en) * | 2015-09-18 | 2017-03-29 | 中国石油化工股份有限公司 | A kind of method for pressing off the multiple horizontal bedding seams of shale gas |
| CN106567701A (en) * | 2015-10-09 | 2017-04-19 | 中国石油化工股份有限公司 | Hydraulic fracturing method |
| WO2018032086A1 (en) * | 2016-08-18 | 2018-02-22 | Velvet Energy Ltd. | Fracture length increasing method |
| CN106958438A (en) * | 2017-02-20 | 2017-07-18 | 中国石油化工股份有限公司 | A kind of polymer flooding blocks the method for removing blockage of well |
| CN110439521A (en) * | 2019-08-05 | 2019-11-12 | 中国石油天然气股份有限公司 | Advanced energy storage fracturing method |
Non-Patent Citations (3)
| Title |
|---|
| 姜贵璞等: "杏北地区注水井油层堵塞实验及酸化方法", 《大庆石油学院学报》 * |
| 李君权等: "高含长石低孔低渗砂岩油藏酸压体系及工艺优化", 《中外能源》 * |
| 蒋文学等: "环82区长8酸敏储层前置酸压裂技术研究与应用", 《钻采工艺》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780246A (en) * | 2021-02-28 | 2021-05-11 | 西南石油大学 | Organic acid solution treatment method for enhancing and maintaining flow conductivity of tight sandstone reservoir fracture |
| CN114991738A (en) * | 2021-03-01 | 2022-09-02 | 中国石油天然气股份有限公司 | Sandstone reservoir composite transformation method |
| CN114991738B (en) * | 2021-03-01 | 2024-03-26 | 中国石油天然气股份有限公司 | Sandstone reservoir composite reconstruction method |
| CN115434680A (en) * | 2021-06-03 | 2022-12-06 | 中国石油天然气股份有限公司 | Gas well reservoir transformation method |
| CN115434680B (en) * | 2021-06-03 | 2023-12-26 | 中国石油天然气股份有限公司 | Method for reforming gas well reservoir |
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