CN111234790B - Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir, profile control agent, preparation method and application - Google Patents
Gel particles suitable for low-permeability fractured carbon dioxide flooding oil reservoir, profile control agent, preparation method and application Download PDFInfo
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- CN111234790B CN111234790B CN202010102073.7A CN202010102073A CN111234790B CN 111234790 B CN111234790 B CN 111234790B CN 202010102073 A CN202010102073 A CN 202010102073A CN 111234790 B CN111234790 B CN 111234790B
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- 239000007863 gel particle Substances 0.000 title claims abstract description 126
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 87
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 55
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000178 monomer Substances 0.000 claims abstract description 48
- 239000002253 acid Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003999 initiator Substances 0.000 claims abstract description 11
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 9
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 8
- 150000003839 salts Chemical class 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 43
- 229920000642 polymer Polymers 0.000 claims description 31
- 239000002245 particle Substances 0.000 claims description 26
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- 238000000034 method Methods 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- 125000002091 cationic group Chemical group 0.000 claims description 10
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000012153 distilled water Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 8
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 claims description 8
- -1 diallyl quaternary ammonium salt Chemical class 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 8
- 239000012071 phase Substances 0.000 claims description 8
- 229940113115 polyethylene glycol 200 Drugs 0.000 claims description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 7
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 6
- BCAIDFOKQCVACE-UHFFFAOYSA-N 3-[dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azaniumyl]propane-1-sulfonate Chemical compound CC(=C)C(=O)OCC[N+](C)(C)CCCS([O-])(=O)=O BCAIDFOKQCVACE-UHFFFAOYSA-N 0.000 claims description 6
- FLCAEMBIQVZWIF-UHFFFAOYSA-N 6-(dimethylamino)-2-methylhex-2-enamide Chemical compound CN(C)CCCC=C(C)C(N)=O FLCAEMBIQVZWIF-UHFFFAOYSA-N 0.000 claims description 6
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 6
- 239000008346 aqueous phase Substances 0.000 claims description 6
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000003623 enhancer Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 5
- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical group [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims description 4
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 3
- 229960003237 betaine Drugs 0.000 claims description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 3
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 23
- 238000011161 development Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
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- 239000003921 oil Substances 0.000 description 43
- 230000035699 permeability Effects 0.000 description 13
- 230000002378 acidificating effect Effects 0.000 description 9
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- 239000007788 liquid Substances 0.000 description 8
- 239000010779 crude oil Substances 0.000 description 7
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- 241000237858 Gastropoda Species 0.000 description 3
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- 238000005336 cracking Methods 0.000 description 3
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- 208000013201 Stress fracture Diseases 0.000 description 2
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- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
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- 150000003863 ammonium salts Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- YIOJGTBNHQAVBO-UHFFFAOYSA-N dimethyl-bis(prop-2-enyl)azanium Chemical compound C=CC[N+](C)(C)CC=C YIOJGTBNHQAVBO-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000005496 phosphonium group Chemical group 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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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
- E21B43/164—Injecting CO2 or carbonated water
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Abstract
The invention relates to the technical field of oil field profile control and water shutoff agents, in particular to gel particles suitable for low-permeability fractured carbon dioxide flooding reservoirs, a profile control agent, a preparation method and application. The gel particle raw material comprises the following components in percentage by mass: 10-20% of acrylamide monomer; 10-30% of acid-resistant functional monomer; 1-3.0% of temperature-resistant functional monomer; 1-3.0% of salt-tolerant functional monomer; 1-2.0% of a cross-linking agent; 1-10% of an initiator; 0.2 to 1.0 percent of reinforcing agent; the balance of water phase. And compounding the gel particles with a solution of a cationic polymer to obtain the acid-resistant gel particle splitting agent. The acid-resistant gel particle profile control system prepared by the invention has good temperature resistance, salt resistance and acid resistance and long effective period of action, and can be used as excellent hypotonic fissuring CO2The oil displacement reservoir profile control system is used for blocking heterogeneous strata with micro-crack development.
Description
Technical Field
The invention relates to the technical field of oil field profile control water plugging agents, in particular to a low-permeability fractured CO plugging agent2Gel particles and a profile control agent for oil displacement reservoirs, and a preparation method and application thereof.
Background
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
In recent years, with the continuous deepening of oil field development, the heterogeneity of an oil reservoir is stronger, residual oil is generally distributed, the phenomena of flooding and channeling are serious, injected fluid is ineffective to circulate, and effective plugging is difficult to realize by a conventional polymer gel profile control means. Researches show that the gel particles have good effects on deep profile control of oil fields with strong heterogeneity, high water content and large pore canals. Because the gel particles have certain deformability after water absorption and expansion, the gel particles can move into the deep part of the stratum through deformation under certain pressure difference, and because the stratum pressure is gradually reduced in the deep part of the stratum, the particles continuously absorb water and expand and are retained in the large pore passage to block the large pore passage, so that the stratum permeability is adjusted, and the deep liquid flow steering effect is achieved. The gel particles have simple preparation process and good stability in the use process, and the defects of poor underground gelling effect and limited plugging effect of the traditional gel plugging agent are overcome.
CO2The flooding has great potential and strong adaptability in low-permeability reservoirs, but the low-permeability reservoirs have strong microcrack development and heterogeneity and are easy to generate channeling. CO 22The oil reservoir is generally in a supercritical state under the conditions of high temperature and high pressure, and the oil reservoir environment in the supercritical state is generally acidic (pH is approximately equal to 3). The deep profile control technology of pre-crosslinked gel particles comprises the steps of crosslinking a crosslinking system on the ground to form a body gel, then preparing the gel particles through the processes of granulation, drying, crushing, screening and the like, wherein the gel particles exist in water as dispersed irregular blocky particles and have certain expansibility, and after the gel particles are injected into stratum pores, the gel particles are subjected to deep profile control and flooding treatmentIn the near wellbore area, due to the large pressure difference, the particles can deform and move to a production well under the action of water drive pressure; in the deep part of the oil layer, because the pressure difference is small, the particles are retained in the pores to block the high-permeability pore channel, thereby playing the role of deep part liquid flow diversion.
Disclosure of Invention
The inventor finds that: the conventional polyacrylamide gel particles have poor shearing resistance and poor expansibility under an acidic condition, and are easy to degrade after being expanded, so that the profile control performance of the gel particles is reduced, and the crude oil production is influenced. Aiming at the problems, the invention provides a low-permeability fractured CO treating agent suitable for low-permeability fractured CO2The invention discloses gel particles for flooding oil reservoirs, a profile control agent, a preparation method and application thereof, and the gel particles and the profile control agent are used for plugging low-permeability fractured CO2The gel particles of the oil displacement reservoir high-permeability pore canal not only have good shear resistance in an acid environment, but also have the characteristic of difficult degradation and failure.
The first object of the present invention: provide a low permeability cracking CO suitable for2Gel particles for flooding reservoirs and a preparation method thereof.
The second object of the present invention: provide a low permeability cracking CO suitable for2A profile control agent for oil displacement and a preparation method thereof.
The third object of the present invention: provides the application of the gel particles and the profile control agent.
In order to achieve the above purpose, the invention specifically discloses the following technical scheme:
first, the present invention discloses a method for treating low-permeability fractured CO2The gel particles for oil displacement comprise the following raw materials in percentage by mass:
further, the acid resistant monomers include: diallyl quaternary phosphonium saltAny one of ammonium salt, dimethylaminopropyl methacrylamide (DMAPMA) and dimethyldiallylammonium chloride (DMDACC). Dimethyl diallyl ammonium chloride (DMDACC) is preferred. The acid-resistant monomer has the main function of endowing the gel particles with acid resistance, because the acid-resistant monomer contains cationic groups and can resist H in an acid environment due to electrostatic repulsion+Thereby improving the problems that the gel particles have poor shearing resistance and poor expansibility under an acidic condition, and are easy to degrade after being expanded to cause the reduction of profile control performance.
Further, the temperature-resistant monomer comprises any one of styrenesulfonic acid, N-alkyl maleimide, 2-acrylamide-2-methyl propanesulfonic Acid (AMPS) and sodium 4-styrenesulfonate. Sodium 4-styrenesulfonate is preferred. The temperature-resistant monomer has the main functions of endowing the gel particles with high temperature resistance and improving the effective period of the gel particles.
Further, the salt-tolerant monomer comprises any one of N-vinyl-2-pyrrolidone (NVP), N-dimethylacrylamide, methacrylamide and [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide. Preferably, [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide. The salt-resistant monomer has the main functions of endowing the gel particles with salt resistance and improving the effective period of the gel particles.
Further, the crosslinking agent includes N, N-methylenebisacrylamide, dimethylaminoethyl methacrylate, and the like. N, N-methylenebisacrylamide is preferred. The main function of the method is to generate chemical bonds among linear molecules so that the linear molecules are connected with each other to form a three-dimensional network structure.
Further, the enhancer is polyethylene glycol or the like, preferably polyethylene glycol-200. The main function of the gel is to improve the mechanical property of the gel particles.
Further, the initiator includes ammonium persulfate, potassium persulfate, and the like. The main function is to induce the monomer to generate polymerization reaction. The aqueous phase includes distilled water, deionized water, and the like.
Further, the above also applies toLow permeability fissured CO2Other additives and the like are added on the basis of the raw material composition of the gel particles for oil displacement, for example, in order to further improve the shearing resistance of the gel particles, some nano SiO can be added2。
Secondly, the invention discloses that the low-permeability crack CO is suitable for low-permeability crack2The preparation method of the gel particles for oil displacement comprises the following steps:
(1) under the condition of stirring, sequentially adding acrylamide, an acid-resistant functional monomer, a temperature-resistant functional monomer and a salt-resistant functional monomer into a water phase, and stirring until the solution becomes clear; then adding a cross-linking agent and a reinforcing agent, and stirring until the cross-linking agent and the reinforcing agent are completely dissolved; and adding an initiator, stirring to obtain a uniformly dispersed water phase solution, and finally removing air in the solution by ultrasonic oscillation.
(2) And (2) reacting the water-phase solution finally obtained in the step (1) at a constant temperature to form gel, cutting the gel into blocks, cleaning, drying, grinding, and screening micron-sized to millimeter-sized particles to obtain the target acid-resistant gel particles.
Further, in the step (1), the power of the ultrasonic oscillation is 50-100W, and the time is 8-15 min.
Further, in the step (2), the reaction temperature under the constant temperature condition is 50-70 ℃ and the reaction time is 2-4 h.
Thirdly, the invention discloses a low-permeability fractured CO-treating agent suitable for low-permeability fracture2The profile control agent for reservoir flooding comprises the profile control agent suitable for low-permeability fractured CO2Gel particles to displace oil reservoirs and polymers with positive charges.
Further, in the profile control agent, the concentration of the gel particles is 500-3000mg/L, and the concentration of the polymer with positive charges is 500-2000 mg/L.
Further, in the profile control agent, the positively charged polymer includes at least one of a cationic polymer 8030, a betaine-type amphiphilic polymer PADC, a hydrophobically associating polymer AP-P4, and the like; preferably cationic polyacrylamide 8030.
Still further, the present invention discloses the use of said CO for low permeability cracking2Preparation of profile control agent for oil displacement reservoirThe method comprises the following steps: and preparing the cationic polymer into a solution, and dispersing the gel particles into the solution to obtain the gel particle.
Finally, the invention discloses low permeability fissile CO2The gel particles and the profile control agent of the oil displacement reservoir are applied to the field of oil and gas exploitation.
Preferably, the method is suitable for low permeability fractured CO2The application of the profile control agent for flooding oil reservoirs in the field of oil and gas exploitation is a method for profile control, and the method comprises the following steps: before the gel particle profile control agent is injected into the stratum, a front section plug is injected into the stratum as a sacrificial agent, then the profile control agent is injected, and finally supercritical CO is carried out2And (5) driving.
Further, the sacrificial agent is the positively charged polymer; preferably 0.05-0.2 mass percent of cationic polyacrylamide 8030.
Further, the injection amount of the profile control agent is 5-50% of the pore volume of the stratum.
Further, the injection amount of the sacrificial agent is 0.1-2% of the pore volume of the stratum.
Further, the CO is2The specific parameters of the driver can be designed and adjusted by the skilled person according to the actual situation.
Compared with the prior art, the invention has the following beneficial effects:
(1) the acid-resistant monomer is introduced to the main chain of the internal structure of the polymer gel particles, so that the acid resistance of the synthesized gel particles is improved, the temperature-resistant monomer and the salt-resistant monomer are introduced to the main chain of the gel particles to enhance the temperature resistance and salt tolerance of the gel particles, and the prepared gel particle profile control system has good temperature resistance, salt resistance, acid resistance and long effective period, and can be used as excellent hypotonic crack CO2The oil displacement reservoir dissection regulating agent is used for blocking heterogeneous stratum with micro-crack development. In low permeability fissured CO2The oil displacement reservoir has good shearing resistance under the acidic condition, high plugging efficiency and good stability, and can achieve the long-term effective profile control effect.
(2) Because the gel particles belong to cationic gel particles, and the gel particles are compounded with an anionic polymer solution and are easy to coalesce, and cannot be stably suspended in the solution, the cationic polymer is adopted as the dispersing agent, the obtained profile control agent system has good suspension property, good dispersibility and no flocculation, and the defect of flocculation and sedimentation of the particles caused by the electrostatic action of the anionic polymer is overcome.
(3) The method for adding the cationic polymer 8030 as the sacrificial agent slug before injecting the profile control agent is designed by the invention, which is not only beneficial to injecting the profile control agent into the deep part of the oil reservoir to realize the purpose of deep liquid flow diversion, but also has high performability, and can improve the profile control effect of the heterogeneous oil reservoir to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a microscopic morphology image under a Scanning Electron Microscope (SEM) of the acid-resistant gel particles prepared according to the first embodiment of the present invention.
Fig. 2 is a fourier-infrared spectrum of the acid-resistant gel particles and AM monomer prepared according to the first embodiment of the present invention.
Fig. 3 is a primary particle size distribution of the acid-resistant gel particles prepared according to the first embodiment of the present invention.
Fig. 4 is a graph showing the expansion of the particle size of the acid-resistant gel particles prepared in accordance with the first embodiment of the present invention.
FIG. 5 is a graph showing the variation in the particle size of gel particles; wherein, a is the acid-resistant gel particles prepared according to the first embodiment of the present invention; b picture is common gel particle.
Fig. 6 is a pressure difference change curve diagram obtained by an experiment for plugging a natural microfracture low-permeability core by a profile control agent prepared by a fourth embodiment of the invention in a room.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, the conventional polyacrylamide gel particles have poor shear resistance and poor expansibility under acidic conditions, and are easily degraded after being expanded, so that the profile control performance of the gel particles is reduced, and the crude oil production is affected. Therefore, the invention proposes to be suitable for low-permeability fractured CO2The invention further discloses gel particles and a profile control agent for oil displacement, a preparation method and application thereof, which are described in the specification in combination with specific embodiments.
Description of related terms
The term "CO2Reservoir flooding: the carbon dioxide flooding technology is a technology for injecting carbon dioxide into an oil layer to improve the oil recovery rate of an oil field. The basic principle is as follows: the carbon dioxide does not form a miscible front when it first contacts the formation crude oil, but under the appropriate conditions of pressure, temperature and crude oil composition, the carbon dioxide can form a miscible front. The supercritical fluid will extract heavier hydrocarbons from the crude oil and continually condense the gas displacing the front. The carbon dioxide and crude oil then become a miscible liquid, forming a single liquid phase, which effectively displaces the formation crude oil to the production well.
The term "gel": colloidal particles or macromolecules in the sol or the solution are connected with each other under certain conditions to form a space network structure, liquid serving as a dispersion medium is filled in structural gaps, and the whole system becomes an elastic semisolid which has uniform appearance and certain shape and does not have fluidity, namely gel.
The term "profile control agent": i.e. the material used to adjust the water-flooding formation suction profile. The majority (80% -90%) of the water injected into the oil layer is absorbed by the highly permeable layer, resulting in a very uneven injection profile. In order to exert the function of the medium and low permeable layers and improve the sweep efficiency of the injected water, the injection profile of the water injection well must be adjusted by a profile control agent.
The term "pre-slug": the slug is an obvious oil displacement zone formed by the oil displacement agent after the oil displacement agent is injected into an oil layer, and then the oil displacement zone is displaced by another oil displacement agent, and at the moment, the oil displacement zone formed by the former oil displacement agent is called the slug. Whereas pre-placement refers to the addition of a sacrificial agent prior to the injection of the gel particle profile control agent into the formation.
In addition, in the following examples, the cationic polymer 8030 was obtained from Tianrun chemical industries, Inc., Anhui. The betaine type amphiphilic polymer PADC is purchased from Anguilu chemical industry, Inc. The hydrophobically associative polymer AP-P4 was purchased from Szechwan photosubfamily, Inc.
First embodiment
1. Be applicable to hypotonic fissile CO2The preparation method of the gel particles for oil displacement comprises the following steps:
(1) raw materials: 6g of acrylamide; 11.3332g of acid-resistant functional monomer; 0.87g of temperature-resistant functional monomer; 1.178g of salt-tolerant functional monomer; 4g of an initiator; 0.52g of a crosslinking agent; 0.2g of reinforcing agent; 19.822g of distilled water.
Wherein: the acid-resistant functional monomer is dimethyl diallyl ammonium chloride; the temperature-resistant functional monomer is 4-styrene sulfonic acid sodium salt; the salt-tolerant functional monomer is [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide; the initiator is ammonium persulfate with the mass concentration of 15 percent; the cross-linking agent is N, N-methylene-bisacrylamide; the enhancer is polyethylene glycol-200.
(2) Respectively weighing acrylamide, dimethyl diallyl ammonium chloride, 4-styrene sodium sulfonate and [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide according to the content, sequentially adding the materials into a beaker filled with distilled water while stirring, and stirring until the solution becomes clear; then adding N, N-methylene bisacrylamide and polyethylene glycol-200 into the solution, and stirring until all the components are dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and ultrasonic oscillation is carried out for 10min (power is 80W) to remove air in the solution, so as to prepare water phase solution with uniform dispersion.
(3) And (3) placing the aqueous phase solution in a thermostat, setting the temperature of the thermostat to be 60 ℃, and taking out after reacting for 2 hours. And cutting the obtained gel into blocks, washing the blocks with distilled water for 4 times, drying the blocks in a constant-temperature drying oven at 60 ℃ for 24 hours, taking out the blocks, grinding the blocks by using a grinder, and screening micron-sized to millimeter-sized particles to obtain the target acid-resistant gel particles.
2. Is suitable for low-permeability fractured CO2The preparation method of the profile control agent for oil displacement reservoirs comprises the following steps: selecting cationic polyacrylamide 8030 as a polymer to prepare a polymer solution, and dissolving the target acid-resistant gel particles prepared in the embodiment into the polymer solution according to the mass ratio of 1000mg/L, wherein the polymer concentration is 1000mg/L, so as to obtain the acid-resistant gel particle profile control agent.
Second embodiment
1. Be applicable to hypotonic fissile CO2The preparation method of the gel particles for flooding reservoirs comprises the following steps:
(1) raw materials: 5.002g of acrylamide; 14.999g of acid-resistant functional monomer; 0.501g of temperature-resistant functional monomer; 1.498g of salt-resistant functional monomer; 1.001g of an initiator; 0.500g of cross-linking agent; 0.499g of intensifier; 25.998g of deionized water.
Wherein: the acid-resistant functional monomer is diallyl quaternary ammonium salt; the temperature-resistant functional monomer is N-alkyl maleimide; the salt-tolerant functional monomer is methacrylamide; the initiator is ammonium persulfate solution with the mass concentration of 15%; the cross-linking agent is dimethylaminoethyl methacrylate; the enhancer is polyethylene glycol-200.
(2) Respectively weighing acrylamide, diallyl quaternary ammonium salt, N-alkyl maleimide and methacrylamide according to the content, sequentially adding the weighed acrylamide, diallyl quaternary ammonium salt, N-alkyl maleimide and methacrylamide into a beaker filled with deionized water while stirring, and stirring until the solution becomes clear; then adding dimethylaminoethyl methacrylate and polyethylene glycol-200 into the solution, and stirring until all the materials are dissolved. And finally, adding an ammonium persulfate solution, stirring for 30min, and removing air in the solution by ultrasonic oscillation for 15min (with the power of 100W) to prepare a uniformly dispersed water-phase solution.
(3) And (3) placing the aqueous phase solution in a thermostat, setting the temperature of the thermostat to be 70 ℃, reacting for 2 hours, and taking out. And cutting the obtained gel into blocks, washing the blocks with distilled water for 5 times, drying the blocks in a constant-temperature drying oven at 60 ℃ for 24 hours, taking out the blocks, grinding the blocks with a grinder, and screening micron-sized to millimeter-sized particles to obtain the target acid-resistant gel particles.
2. Is suitable for low-permeability fractured CO2The preparation method of the profile control agent for oil displacement comprises the following steps: and (2) selecting a hydrophobic association polymer AP-P4 as a polymer to prepare a polymer solution, and dissolving the target acid-resistant gel particles prepared in the embodiment into the polymer solution according to the mass ratio of 3000mg/L, wherein the polymer concentration is 2000mg/L, so as to obtain the acid-resistant gel particle profile control agent.
Third embodiment
1. Be applicable to hypotonic fissuring CO2The preparation method of the gel particles for flooding reservoirs comprises the following steps:
(1) raw materials: 10.001g of acrylamide; 5.000g of acid-resistant functional monomer; 1.499g of temperature-resistant functional monomer; 0.500g of salt-tolerant functional monomer; 0.501g of initiator; 5.002g of cross-linking agent; 0.103g of reinforcing agent; 22.601g of distilled water.
Wherein: the acid-resistant functional monomer is dimethylaminopropyl methacrylamide; the temperature-resistant functional monomer is 2-acrylamide-2-methylpropanesulfonic acid; the salt-tolerant functional monomer is N-vinyl-2-pyrrolidone; the initiator is 15 wt.% potassium persulfate solution; the cross-linking agent is N, N-methylene-bisacrylamide; the enhancer is polyethylene glycol-200.
(2) Respectively weighing acrylamide, dimethylaminopropyl methacrylamide, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl-2-pyrrolidone according to the content, sequentially adding the weighed acrylamide, dimethylaminopropyl methacrylamide, 2-acrylamide-2-methylpropanesulfonic acid and N-vinyl-2-pyrrolidone into a beaker containing the distilled water while stirring, and stirring until the solution becomes clear; then adding N, N-methylene-bisacrylamide and polyethylene glycol-200 into the solution, and stirring until all the components are dissolved. Finally, ammonium persulfate solution is added, then stirring is carried out for 30min, and ultrasonic oscillation is carried out for 8min (with the power of 50W) to remove air in the solution, so as to prepare evenly-dispersed water-phase solution.
(3) And (3) placing the aqueous phase solution in a thermostat, setting the temperature of the thermostat to be 50 ℃, and taking out after reacting for 4 hours. And cutting the obtained gel into blocks, washing the blocks with distilled water for 4 times, drying the blocks in a constant-temperature drying oven at 60 ℃ for 24 hours, taking out the blocks, grinding the blocks by using a grinder, and screening micron-sized to millimeter-sized particles to obtain the target acid-resistant gel particles.
2. Is suitable for low-permeability fractured CO2The preparation method of the profile control agent for oil displacement comprises the following steps: selecting a betaine type amphiphilic polymer PADC as a polymer to prepare a polymer solution, and dissolving the target acid-resistant gel particles prepared in the embodiment into the polymer solution according to the mass ratio of 500mg/L, wherein the polymer concentration is 500mg/L, so as to obtain the acid-resistant gel particle profile control agent.
Fourth embodiment
A profile control method using the gel particle profile control agent prepared in the first example.
(1) Leading a liquid slug: the pad fluid slug is used as a sacrificial agent and is a cationic polyacrylamide 8030 aqueous solution with the mass concentration of 0.1 percent, and the injection volume of the pad fluid slug is 2 percent (0.02PV) of the pore volume of the stratum;
(2) main body slug: the main body slug is the low permeability fissile CO prepared in the first example2A profile control agent for flooding the reservoir, the injection volume of which is 50% (0.5PV) of the pore volume of the formation;
(3) after the completion of the two slugs, CO is carried out2And (3) gas flooding, namely, flooding the gel particles to a deep layer to realize deep profile control.
Fifth embodiment
A profile control method is carried out by using the gel particle profile control agent prepared in the first embodiment.
(1) Leading a liquid slug: the pad fluid slug is used as a sacrificial agent and is a cationic polyacrylamide 8030 aqueous solution with the mass concentration of 0.2 percent, and the injection volume of the pad fluid slug is 0.1 percent (0.02PV) of the pore volume of the stratum;
(2) a main body slug: the main body slug is the low permeability fissile CO prepared in the first example2Profile control agent for reservoir flooding, its injection volume is 30% (0.3PV) of the formation pore volume;
(3) after the completion of the two slugs, CO is carried out2And (3) gas flooding, namely, flooding the gel particles to a deep layer to realize deep profile control.
Sixth embodiment
A profile control method is carried out by using the gel particle profile control agent prepared in the first embodiment.
(1) Leading a liquid slug: the pad fluid slug is used as a sacrificial agent and is a cationic polyacrylamide 8030 aqueous solution with the mass concentration of 0.05 percent, and the injection volume of the pad fluid slug is 1 percent (0.02PV) of the pore volume of the stratum;
(2) a main body slug: the main body slug is low-permeability fractured CO prepared by the first embodiment2Profile control agent for reservoir flooding, its injection volume is 5% (0.05PV) of formation pore volume;
(3) after the completion of the two slugs, CO is carried out2And (3) gas flooding, namely, flooding the gel particles to a deep layer to realize deep profile control.
Performance test
1. Taking the gel particles and the profile control agent prepared in the first example as examples, the various performances of the gel particles and the profile control agent are tested, and specifically:
FIG. 1 is a microscopic morphology image of the gel particles observed under a scanning electron microscope. It can be seen from the figure that the gel particles are irregular particles with different shapes and sizes.
Fig. 2 is a fourier-infrared spectrum of the gel particles and AM monomer, wherein: curve (a) is the infrared spectrum of the acid-resistant gel particles, and curve (b) is the infrared spectrum of the AM monomer. Analysis of FIG. 2 revealed that 1612cm in the curve (b)-1The peak at (a) is the stretching vibration peak of C ═ C, and this peak has disappeared, demonstrating that the AM monomer C ═ C is open to polymerization. 3353cm in Curve (a)-1Has a peak of-NH2The stretching vibration peak of (1); 1668cm-1Has a peak of-CONH2C ═ O in (a) shows a stretching vibration peak; 1425cm-1The peak is a stretching vibration peak of-C ≡ N; 2960cm-1The peak is-CH in dimethyl diallyl ammonium chloride3The stretching vibration peak of (2) proves the success of synthesis.
FIG. 3 is a graph showing the particle size distribution of the gel particles. As can be seen from the graph, the particle size of the gel particles exhibited polydispersities, indicating that the shapes and sizes varied, and the average particle size was about 36 μm.
Fig. 4 shows the expansion factor of the particle size of the gel particles. The gel particles were placed in an acidic solution of pH 3 and a neutral solution of pH 7, respectively, and the particle size of the gel particles was measured with a particle size analyzer and the expansion factor thereof was calculated. As can be seen from FIG. 4, at 16 days, the expansion of the granules reaches the equilibrium, the expansion factor reaches 1.70 under the neutral environment, and the expansion factor reaches 1.41 under the acidic environment slightly less than the neutral environment. In addition, after the gel particles are placed for 120 days, the degradation phenomenon is not obvious in an acid environment and a neutral environment, and the gel particles prepared by the method are stable in structure and good in acid resistance.
FIG. 5 is a variation of particle diameters of the gel particles and the general gel particles prepared in the first example, and it can be seen from FIG. 5 and Table 1 that the swelling of the general gel is greatly suppressed under the acidic condition, the swelling rate is only 1.12 times lower, and the particle diameter retention rate (the ratio of the particle diameter of the gel particles after shearing to the particle diameter of the gel particles after swelling) of the general gel particles after shearing at the same rate and time is 63.69%, and the particle diameter retention rate of the acid-resistant gel particles can reach 81.37%, indicating that the gel particles prepared in the present invention are more stable than the general gel particles under the acidic condition and have better shear resistance, meaning that the gel particles prepared in the present invention are more stable than the general gel particles under the CO condition and have better shear resistance2And high temperature and high pressure, and is more shear resistant in an acidic reservoir environment.
TABLE 1 statistical table of average particle diameters of gel particles
2. Taking the gel particle profile control agent prepared in the fourth embodiment as an example, the profile control performance of the gel particle profile control agent is tested, and specifically: as shown in fig. 6, it is a chamberAnd internally simulating a pressure difference change curve chart of the gel particle profile control agent on a natural micro-fracture low-permeability core plugging experiment. As can be seen from the figure, supercritical CO2When 0.7PV is injected, the internal flow of the core occurs, the pressure difference is sharply reduced, and the permeability of the core is 2.52 multiplied by 10 from the initial permeability-3μm2Increased to 26.3 × 10-3μm2(ii) a Injecting a sacrificial slug cationic polymer 8030 solution of 0.02PV into the core, then injecting an acid-resistant gel particle profile control system of 0.5PV, wherein the pressure difference between two ends of the core is gradually increased along with the injection of the profile control system, namely the permeability is gradually reduced; after the injection of the profile control system is finished, supercritical CO is carried out2The figure shows that the pressure difference at the stage is slightly lower than that of the profile control system, but still higher than that of the core when the core has cross flow, which indicates that the supercritical CO at the stage2The acid-resistant gel particles are driven to the deep part of the core to block the channeling passage, and the permeability of the core is 7.68 multiplied by 10 at the moment-3μm2. The plugging rate of the acid-resistant gel particle profile control system can reach 70.8 percent, which indicates that the gel particle profile control system is applied to supercritical CO2The acid reservoir flooding environment has good plugging profile control performance.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (18)
1. The profile control agent is suitable for low-permeability fractured carbon dioxide flooding reservoirs, and is characterized by comprising a polymer with positive charges and gel particles of the low-permeability fractured carbon dioxide flooding reservoirs;
the gel particles of the low-permeability fractured carbon dioxide flooding oil reservoir comprise the following raw materials in percentage by mass:
2. the profile control agent suitable for low-permeability fractured carbon dioxide flooding reservoirs according to claim 1, wherein the gel particles of the low-permeability fractured carbon dioxide flooding reservoirs further comprise nano SiO2。
3. The profile control agent suitable for low-permeability fractured carbon dioxide flooding reservoirs according to claim 1, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoirs, the acid-resistant monomers comprise: any one of diallyl quaternary ammonium salt, dimethylamino propyl methacrylamide and dimethyl diallyl ammonium chloride;
alternatively, the temperature-resistant monomer comprises: any one of styrene sulfonic acid, N-alkyl maleimide, 2-acrylamide-2-methylpropanesulfonic acid and 4-sodium styrene sulfonate;
alternatively, the salt-tolerant monomers comprise: any one of N-vinyl-2-pyrrolidone, N-dimethylacrylamide, methacrylamide, and [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide;
alternatively, the crosslinking agent comprises N, N-methylenebisacrylamide, dimethylaminoethyl methacrylate;
alternatively, the enhancer is polyethylene glycol;
or the initiator comprises at least one of ammonium persulfate and potassium persulfate;
alternatively, the aqueous phase comprises at least one of distilled water and deionized water.
4. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir of claim 3, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoir, the acid-resistant monomer is dimethyl diallyl ammonium chloride.
5. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir according to claim 3, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoir, the temperature-resistant monomer is sodium 4-styrene sulfonate.
6. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir according to claim 3, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoir, the salt-tolerant monomer is [2- (methacryloyloxy) ethyl ] dimethyl- (3-sulfopropyl) ammonium hydroxide.
7. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir of claim 3, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoir, the cross-linking agent is N, N-methylene-bis-acrylamide.
8. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir according to claim 3, wherein in the gel particle raw material composition of the low-permeability fractured carbon dioxide flooding reservoir, the reinforcing agent is polyethylene glycol-200.
9. The profile control agent suitable for low-permeability fractured carbon dioxide flooding reservoirs according to any one of claims 1 to 8, wherein the method for manufacturing the gel particles of the low-permeability fractured carbon dioxide flooding reservoirs comprises the following steps:
(1) under the condition of stirring, sequentially adding acrylamide, an acid-resistant functional monomer, a temperature-resistant functional monomer and a salt-resistant functional monomer into a water phase, and stirring until the solution becomes clear; then adding a cross-linking agent and a reinforcing agent, and stirring until the cross-linking agent and the reinforcing agent are completely dissolved; adding an initiator, stirring to obtain a uniformly dispersed water phase solution, and finally removing air in the solution by ultrasonic oscillation;
(2) and (2) reacting the aqueous phase solution finally obtained in the step (1) into gel under a constant temperature condition, cutting the gel into blocks, cleaning, drying, grinding, and screening micron-sized to millimeter-sized particles to obtain the target acid-resistant gel particles.
10. The profile control agent suitable for the low-permeability fractured carbon dioxide flooding reservoir according to claim 9, wherein in the preparation method of the gel particles of the low-permeability fractured carbon dioxide flooding reservoir, in the step (1), the power of the ultrasonic oscillation is 50-100W, and the time is 8-15 min;
or in the step (2), the reaction is carried out at the constant temperature of 50-70 ℃ for 2-4 h.
11. The profile control agent suitable for low-permeability fractured carbon dioxide flooding oil reservoir as claimed in claim 1, wherein the concentration of the gel particles is 500-3000mg/L, and the concentration of the polymer with positive charges is 500-2000 mg/L.
12. The profile control agent suitable for hypotonic fractured carbon dioxide flooding reservoirs according to claim 1, wherein the positively charged polymer comprises at least one of cationic polymer 8030, betaine type amphiphilic polymer PADC, and hydrophobically associating polymer AP-P4.
13. The profile control agent suitable for use in a hypotonic fractured carbon dioxide flooding reservoir of claim 12, wherein the positively charged polymer is cationic polyacrylamide 8030.
14. A method of preparing a profile control agent suitable for use in a low-permeability fractured carbon dioxide drive reservoir according to any one of claims 1 to 13, wherein the steps are: and (3) preparing the cationic polymer into a solution, and then dispersing the gel particles into the solution to obtain the gel particles.
15. The use of a profile control agent suitable for a hypotonic fractured carbon dioxide flooding reservoir of any one of claims 1 to 13 or prepared by the method of claim 14 in the field of oil and gas production, wherein the profile control agent is used for profile control in the field of oil and gas production.
16. The use as claimed in claim 15, whichIs characterized in that the profile control agent is applied to profile control and flooding in the field of oil and gas exploitation, and comprises the following steps: before the gel particle profile control agent is injected into the stratum, a front section plug is injected into the stratum as a sacrificial agent, then the profile control agent is injected, and finally supercritical CO is carried out2And (5) driving.
17. The use of claim 16, wherein the sacrificial agent is a positively charged polymer;
or the injection amount of the profile control agent is 5-50% of the pore volume of the stratum;
alternatively, the sacrificial agent is injected in an amount of 0.1 to 2% of the pore volume of the formation.
18. The use of claim 17, wherein the sacrificial agent is cationic polyacrylamide 8030 at a mass concentration of 0.05 to 0.2%.
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