CN111119819B - Method for reducing polymer adsorption of polymer injection flooding oil well - Google Patents
Method for reducing polymer adsorption of polymer injection flooding oil well Download PDFInfo
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- CN111119819B CN111119819B CN202010072655.5A CN202010072655A CN111119819B CN 111119819 B CN111119819 B CN 111119819B CN 202010072655 A CN202010072655 A CN 202010072655A CN 111119819 B CN111119819 B CN 111119819B
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- 229920000642 polymer Polymers 0.000 title claims abstract description 76
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 239000003129 oil well Substances 0.000 title claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 18
- 238000007385 chemical modification Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000005660 hydrophilic surface Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- 239000006004 Quartz sand Substances 0.000 claims description 19
- 239000007822 coupling agent Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 239000007800 oxidant agent Substances 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 15
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 14
- 229920000570 polyether Polymers 0.000 claims description 14
- 229920001296 polysiloxane Polymers 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000004132 cross linking Methods 0.000 claims description 7
- 229910000077 silane Inorganic materials 0.000 claims description 7
- 239000010779 crude oil Substances 0.000 claims description 6
- 230000000704 physical effect Effects 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- -1 polysiloxane Polymers 0.000 description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 4
- 239000003921 oil Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003093 cationic surfactant Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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)
- Polyethers (AREA)
Abstract
The invention belongs to the technical field of oil exploitation, and particularly relates to a method for reducing polymer adsorption of an oil displacement water well for polymer injection. The surface of the sand body of the reservoir is modified into a strong water-wet surface by carrying out strong hydrophilic chemical modification on the reservoir, so that the reservoir is preferentially combined with water, a layer of water film is formed between the hydrophilic surface of the reservoir and the polymer, and the adsorption quantity of the polymer in the polymer flooding injection process is reduced. The method can effectively prevent the polymer from being adsorbed, thereby achieving the purpose of increasing the yield and the injection.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a method for reducing polymer adsorption of an oil displacement water well for polymer injection.
Background
Polymer flooding is an important exploitation mode for oil field development, the principle of polymer flooding is to use water-soluble polymer as a displacement phase, and the excellent mobility control performance of the polymer is utilized to improve swept volume in the displacement process so as to achieve the purpose of improving recovery efficiency.
In the process of polymer flooding, due to the characteristics of the polymer, adsorption and detention can occur on the surface of rock in the driving process, and particularly, the adsorption and detention near an injection well and a production well can cause certain influence on the permeability of a reservoir layer, which is represented by the fact that the output of an oil well is reduced and the injection difficulty of a water well is increased. The reasons and the rules of adsorption of various polymers are well researched in recent decades. For the method for preventing the polymer from adsorbing, usually, a certain amount of sacrificial agent is added in the polymer flooding process as a method for preventing the polymer from adsorbing, that is, a certain amount of cationic surfactant or small molecular alcohol is added in the polymer, and the action principle is that the adsorption amount of the polymer in a reservoir is reduced through the preferential adsorption of the substance and the formation. In practical applications, a certain amount of sacrificial agent slug is usually added at the front end of the polymer flood to reduce the adsorption of polymer in the reservoir. However, in the injection process of the sacrificial agent, the sacrificial agent is quickly lost and disappears due to adsorption in a reservoir stratum, the adsorption prevention capacity of a subsequently injected polymer is weakened, meanwhile, due to the adoption of a cationic surfactant or micromolecular alcohols, the adsorption prevention agent is combined with the reservoir stratum by Van der Waals force, the relative binding force is weak, the adsorption prevention agent is easy to fall off and resolve in the subsequent polymer flooding or water flooding scouring process, the adsorption prevention function of the polymer is lost, and particularly for the near-wellbore area of an oil-water well, the polymer adsorption cannot be effectively prevented in the near-wellbore area of the oil-water well due to the long time of the polymer injection production process, pore canals of a pore are blocked, so that the production capacity of part of the oil-water well is reduced.
Disclosure of Invention
The invention aims to solve the problems that the prior art cannot effectively solve the problems that after polymerization occurs in the production process of the polymer injection flooding well, the polymer is adsorbed in a near wellbore area and a reservoir stratum, so that the permeability of the oil well is reduced, and the yield is reduced; the polymer is accumulated and blocked in a near wellbore area to cause the injection pressure of an injection well to be increased or the injection quantity to be reduced, so that the method for reducing the polymer adsorption of the polymer injection flooding water well can effectively prevent the polymer adsorption, and further achieve the purposes of increasing the yield and the injection.
The technical scheme of the invention is as follows: a method for reducing polymer adsorption of a polymer injection flooding well is characterized in that a reservoir stratum is subjected to strong hydrophilic chemical modification, the surface of a sand body of the reservoir stratum is modified into a strong water-wet surface, the reservoir stratum is preferentially combined with water, a water film is further formed between the hydrophilic surface of the reservoir stratum and a polymer, and the adsorption quantity of the polymer in the polymer injection flooding process is reduced.
The strong hydrophilic chemical modification of the reservoir is realized by the reaction of a hydrophilic coupling agent of the silicone ethers and the sand body of the reservoir.
The method for reducing the polymer adsorption of the polymer injection flooding water well comprises the following steps:
(1) calculating data: selecting an oil-water well in a polymer injection region, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir;
(2) reservoir surface pretreatment: injecting a strong oxidant, closing the well for reaction, decomposing polyacrylamide and part of crude oil attached and adsorbed by the sand body of the reservoir, and exposing silicon hydroxyl on the surface of the quartz sand in the reservoir on the surface; the strong oxidant reacts with polyacrylamide adhered to the rock surface, and generally takes more than 24 hours to remove the polyacrylamide on the rock surface.
(3) Strongly hydrophilic chemical modification of a reservoir: injecting a hydrophilic coupling agent of the polysilicone, performing a well closing reaction, and performing a crosslinking reaction on the hydrophilic coupling agent of the polysilicone and the quartz sand of the reservoir to construct a strong hydrophilic coating interface; controlling the grafting density and uniformity to form the quartz sand surface with uniformly distributed hydrophilic groups. The number of days of shut-in is generally 24 hours to 48 hours.
(4) And (5) opening the well to produce normally.
The strong oxidant is at least one of a composite system consisting of persulfate and a reducing agent, persulfate and sodium hypochlorite.
The silicone hydrophilic coupling agent is silane terminated polyether.
The molecular weight of the silane terminated polyether is 300-1200.
The main molecular structure of the silane-terminated polyether is as follows:
the invention has the beneficial effects that: the method for reducing polymer adsorption of the polymer injection flooding well comprises the steps of chemically modifying the strong hydrophilicity of a reservoir, and chemically modifying the surface of a reservoir sand body into a strong water-wet surface, so that the surface of the reservoir sand body has a strong hydrophilic function, and the reservoir sand body is preferentially combined with water by utilizing the strong hydrophilic function, so that a water film is formed between the hydrophilic surface of the reservoir and the polymer, the water film has the characteristic of adsorption resistance, the adsorption of the polymer in the near-wellbore region of the oil-water well in the polymer injection flooding process is reduced, and the purposes of increasing the yield and increasing the injection are achieved; meanwhile, the formation of the water film also has the characteristic of easy cleaning.
Drawings
FIG. 1 is a schematic view of a process for constructing a strongly hydrophilic coating by a well-closing crosslinking reaction.
FIG. 2 is a graph showing the change in wettability of the surface of a slide glass before and after an anti-polymer adsorption treatment, wherein the left graph shows the wetting angle of water in cleaning a normal slide glass; the right panel shows the wetting angle of a normal glass slide after the polymer adsorption prevention treatment by the method.
Detailed Description
The present invention will be described in detail below with reference to examples.
Example 1
The method for reducing the polymer adsorption of the polymer injection flooding water well comprises the following steps:
(1) calculating data: selecting an oil well with the yield reduced due to polymer adsorption, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir; the processing radius of the reservoir is 3 m;
(2) reservoir surface pretreatment: injecting 3 mass percent of sodium persulfate serving as a strong stratum oxidant into the reservoir by a pump, closing the well, reacting for 1 day, decomposing polyacrylamide and part of crude oil attached and adsorbed by reservoir sand bodies, and exposing silicon hydroxyl on the surface of quartz sand in the reservoir on the surface;
(3) strongly hydrophilic chemical modification of a reservoir: injecting 2% (mass percent) of silane terminated polyether with polyether molecular weight of 300 into the stratum by a pump, closing a well for reaction for 1 day, and performing crosslinking reaction on a polysiloxane hydrophilic coupling agent and reservoir quartz sand to construct a strong hydrophilic coating interface; controlling the grafting density and uniformity to form the quartz sand surface with uniformly distributed hydrophilic groups.
(4) And (5) opening the well to produce normally.
Example 2
The method for reducing the polymer adsorption of the polymer injection flooding water well comprises the following steps:
(1) calculating data: selecting an oil well with the yield reduced due to polymer adsorption, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir; the processing radius of the reservoir is 5 m;
(2) reservoir surface pretreatment: injecting 3 mass percent of sodium persulfate serving as a strong stratum oxidant into the reservoir by a pump, closing the well, reacting for 1 day, decomposing polyacrylamide and part of crude oil attached and adsorbed by reservoir sand bodies, and exposing silicon hydroxyl on the surface of quartz sand in the reservoir on the surface;
(3) strongly hydrophilic chemical modification of a reservoir: injecting 2% (mass percent) of silane terminated polyether with polyether molecular weight of 300 into the stratum by a pump, closing a well for reaction for 1 day, and performing crosslinking reaction on a polysiloxane hydrophilic coupling agent and reservoir quartz sand to construct a strong hydrophilic coating interface; controlling the grafting density and uniformity to form the quartz sand surface with uniformly distributed hydrophilic groups.
(4) And (5) opening the well to produce normally.
Example 3
The method for reducing the polymer adsorption of the polymer injection flooding water well comprises the following steps:
(1) calculating data: selecting an oil well with the yield reduced due to polymer adsorption, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir; the processing radius of the reservoir is 3 m;
(2) reservoir surface pretreatment: injecting 3 mass percent of sodium persulfate serving as a strong stratum oxidant into the reservoir by a pump, closing the well, reacting for 1 day, decomposing polyacrylamide and part of crude oil attached and adsorbed by reservoir sand bodies, and exposing silicon hydroxyl on the surface of quartz sand in the reservoir on the surface;
(3) strongly hydrophilic chemical modification of a reservoir: injecting 2% (mass percentage) of silane terminated polyether with polyether molecular weight of 800 into the stratum by a pump, closing the well for reaction for 1 day, and performing crosslinking reaction on the polysiloxane hydrophilic coupling agent and reservoir quartz sand to construct a strong hydrophilic coating interface; controlling the grafting density and uniformity to form the quartz sand surface with uniformly distributed hydrophilic groups.
(4) And (5) opening the well to produce normally.
Example 4
The method for reducing the polymer adsorption of the polymer injection flooding water well comprises the following steps:
(1) calculating data: selecting an oil well with the yield reduced due to polymer adsorption, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir; the processing radius of the reservoir is 5 m;
(2) reservoir surface pretreatment: injecting 3 mass percent of sodium persulfate serving as a strong stratum oxidant into the reservoir by a pump, closing the well, reacting for 1 day, decomposing polyacrylamide and part of crude oil attached and adsorbed by reservoir sand bodies, and exposing silicon hydroxyl on the surface of quartz sand in the reservoir on the surface;
(3) strongly hydrophilic chemical modification of a reservoir: injecting 2% (mass percentage) of silane terminated polyether with polyether molecular weight of 800 into the stratum by a pump, closing the well for reaction for 1 day, and performing crosslinking reaction on the polysiloxane hydrophilic coupling agent and reservoir quartz sand to construct a strong hydrophilic coating interface; controlling the grafting density and uniformity to form the quartz sand surface with uniformly distributed hydrophilic groups.
(4) And (5) opening the well to produce normally.
Experimental example 1
And (3) indoor simulation of saline water with different mineralization degrees at the reservoir temperature of 60 ℃, soaking quartz sand in the polymer adsorption prevention system to obtain a treated sand body, and performing polymer adsorption prevention evaluation, wherein the details are shown in table 1.
Table 1: polymer adsorption preventing capacity of quartz sand after polymer adsorption preventing treatment
It can also be seen from fig. 2 that the clean common slide appears hydrophilic prior to treatment. The wetted surface becomes strongly hydrophilic when a normal glass slide is treated by the method. The sand main component was silica, and the wettability was tested by replacing the sand with a glass slide. The conclusion is that the quartz surface has been changed to a strongly hydrophilic state by the soaking modification. Adsorption experiments with sand have demonstrated that a strongly hydrophilic quartz surface can reduce polymer adsorption.
Claims (3)
1. A method for reducing polymer adsorption of a polymer injection flooding well is characterized in that a reservoir stratum is subjected to strong hydrophilic chemical modification, the surface of a sand body of the reservoir stratum is modified into a strong water wet surface, the reservoir stratum is preferentially combined with water, a water film is further formed between the hydrophilic surface of the reservoir stratum and a polymer, and the adsorption quantity of the polymer in the polymer injection flooding process is reduced; the strong hydrophilic chemical modification of the reservoir is realized by the reaction of a silicone hydrophilic coupling agent and a reservoir sand body; the method specifically comprises the following steps:
(1) calculating data: selecting a polymer injection flooding oil well, and calculating the processing radius and the subsequent use amounts of a strong oxidant and a silicone hydrophilic coupling agent according to the physical properties of a reservoir;
(2) reservoir surface pretreatment: injecting a strong oxidant, closing the well for reaction, decomposing polyacrylamide and part of crude oil attached and adsorbed by the sand body of the reservoir, and exposing silicon hydroxyl on the surface of the quartz sand in the reservoir on the surface;
(3) strongly hydrophilic chemical modification of a reservoir: injecting a hydrophilic coupling agent of the polysilicone, performing a well closing reaction, and performing a crosslinking reaction on the hydrophilic coupling agent of the polysilicone and the quartz sand of the reservoir to construct a strong hydrophilic coating interface; wherein the silicone hydrophilic coupling agent is silane terminated polyether;
the main molecular structure of the silane-terminated polyether is as follows:
(4) and (5) opening the well to produce normally.
2. The method for reducing the polymer adsorption of the injection-polymerization flooding water well according to claim 1, wherein the strong oxidant is at least one of a composite system consisting of persulfate and a reducing agent, persulfate and sodium hypochlorite.
3. The method for reducing the polymer adsorption of the injection-polymerization flooding oil-displacing water well according to claim 1, wherein the molecular weight of the silane-terminated polyether is 300-1200.
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| CN112196503B (en) * | 2020-10-16 | 2022-07-12 | 中海石油(中国)有限公司 | Method for improving injectivity of oil displacement polymer |
| CN112210361B (en) * | 2020-10-16 | 2022-11-22 | 中海石油(中国)有限公司 | Chemical injection increasing system for improving injectability of oil displacement polymer |
| CN116004119B (en) * | 2021-10-22 | 2024-03-26 | 中国石油化工股份有限公司 | Sand control screen pipe for oil well and preparation method and application thereof |
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| CN105971572A (en) * | 2016-06-01 | 2016-09-28 | 中国海洋石油总公司 | Determination method for alternate injection opportunity of gel/polymer flooding |
| WO2016195713A1 (en) * | 2015-06-05 | 2016-12-08 | Halliburton Energy Services, Inc. | Compositions including a viscosifying non-ionic associative polymer for treatment of subterranean formations |
| CN107407142A (en) * | 2015-01-13 | 2017-11-28 | Bp北美公司 | System and method by the combined treatment of hydrocarbonaceous rock and subsequent water filling from the rock mining hydrocarbon |
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| US20070029085A1 (en) * | 2005-08-05 | 2007-02-08 | Panga Mohan K | Prevention of Water and Condensate Blocks in Wells |
| US20090194276A1 (en) * | 2008-01-31 | 2009-08-06 | Total E&P Usa, Inc. | Determination of an actual optimum salinity and an actual optimum type of microemulsion for surfactant/polymer flooding |
| FR2932841B1 (en) * | 2008-06-24 | 2010-06-11 | Inst Francais Du Petrole | METHOD FOR ASSISTED HYDROCARBON RECOVERY USING ASSOCIATIVE POLYMERS |
| US9518449B1 (en) * | 2011-09-06 | 2016-12-13 | Sandia Corporation | Waterflooding injectate design systems and methods |
| MX2014006223A (en) * | 2014-05-23 | 2015-11-23 | Inst Mexicano Del Petróleo | Branched geminal zwitterionic liquids, method for obtaining same and use thereof as wettability modifiers having viscosity reducing properties. |
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| CN107407142A (en) * | 2015-01-13 | 2017-11-28 | Bp北美公司 | System and method by the combined treatment of hydrocarbonaceous rock and subsequent water filling from the rock mining hydrocarbon |
| WO2016195713A1 (en) * | 2015-06-05 | 2016-12-08 | Halliburton Energy Services, Inc. | Compositions including a viscosifying non-ionic associative polymer for treatment of subterranean formations |
| CN105971572A (en) * | 2016-06-01 | 2016-09-28 | 中国海洋石油总公司 | Determination method for alternate injection opportunity of gel/polymer flooding |
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