CN111927385A - Gel foam temporary plugging and shunting fracturing method for ultra-low permeability reservoir - Google Patents
Gel foam temporary plugging and shunting fracturing method for ultra-low permeability reservoir Download PDFInfo
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- CN111927385A CN111927385A CN202010678126.XA CN202010678126A CN111927385A CN 111927385 A CN111927385 A CN 111927385A CN 202010678126 A CN202010678126 A CN 202010678126A CN 111927385 A CN111927385 A CN 111927385A
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- Prior art keywords
- ultra
- low permeability
- permeability reservoir
- gel foam
- fluid
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Links
- 239000006260 foam Substances 0.000 title claims abstract description 63
- 230000035699 permeability Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 32
- -1 chlorine ions Chemical class 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 11
- 230000003139 buffering effect Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 230000002265 prevention Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 23
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 22
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 17
- 239000004088 foaming agent Substances 0.000 claims description 17
- 229920002401 polyacrylamide Polymers 0.000 claims description 16
- 239000003381 stabilizer Substances 0.000 claims description 16
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 15
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 229920002907 Guar gum Polymers 0.000 claims description 15
- 239000000665 guar gum Substances 0.000 claims description 15
- 229960002154 guar gum Drugs 0.000 claims description 15
- 235000010417 guar gum Nutrition 0.000 claims description 15
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000005011 phenolic resin Substances 0.000 claims description 15
- 229920001568 phenolic resin Polymers 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 14
- 230000000996 additive effect Effects 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 12
- 238000004132 cross linking Methods 0.000 claims description 12
- 239000004094 surface-active agent Substances 0.000 claims description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 11
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 11
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 11
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 10
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 10
- 235000019270 ammonium chloride Nutrition 0.000 claims description 10
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 10
- 229920006037 cross link polymer Polymers 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 claims description 10
- 239000003999 initiator Substances 0.000 claims description 10
- 239000012744 reinforcing agent Substances 0.000 claims description 10
- 238000013329 compounding Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 8
- 239000003945 anionic surfactant Substances 0.000 claims description 7
- 239000002736 nonionic surfactant Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 6
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 claims description 5
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 5
- 239000005711 Benzoic acid Substances 0.000 claims description 5
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 5
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 5
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical group [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 5
- 235000010233 benzoic acid Nutrition 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- CEJLBZWIKQJOAT-UHFFFAOYSA-N dichloroisocyanuric acid Chemical group ClN1C(=O)NC(=O)N(Cl)C1=O CEJLBZWIKQJOAT-UHFFFAOYSA-N 0.000 claims description 5
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 238000005187 foaming Methods 0.000 claims description 5
- 239000001530 fumaric acid Substances 0.000 claims description 5
- CQIOFKRONDXZJC-UHFFFAOYSA-N n-methylideneprop-2-enamide Chemical compound C=CC(=O)N=C CQIOFKRONDXZJC-UHFFFAOYSA-N 0.000 claims description 5
- 239000005543 nano-size silicon particle Substances 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 238000010526 radical polymerization reaction Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- 239000002562 thickening agent Substances 0.000 claims description 5
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 5
- 239000007762 w/o emulsion Substances 0.000 claims description 5
- 239000010878 waste rock Substances 0.000 claims description 5
- 230000000844 anti-bacterial effect Effects 0.000 claims description 4
- 239000003899 bactericide agent Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- 150000003863 ammonium salts Chemical class 0.000 claims description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 2
- 150000007522 mineralic acids Chemical class 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 abstract description 4
- 229910052801 chlorine Inorganic materials 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- FQLQNUZHYYPPBT-UHFFFAOYSA-N potassium;azane Chemical compound N.[K+] FQLQNUZHYYPPBT-UHFFFAOYSA-N 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
-
- 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
-
- 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
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir, which is suitable for an ultra-low permeability heterogeneous reservoir, can enter and plug cracks and pore passages, simultaneously avoids being pressed open, and provides a better method for effective fracturing of an oil field. The invention comprises the following steps: opening a sleeve valve and slowly injecting active water; injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of below 0.5 square/minute to plug the seam end; injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 0.5-2 square/min to block pore throats and seam bands; injecting gel foam temporary plugging diversion liquid into the ultra-low permeability reservoir at a low speed of 0.5-2 square/min, filling inter-particle pore zones, plugging gaps, and buffering fracturing pressure; sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a large displacement speed of 2-4 square/min; and closing the well for 30 minutes, performing blowout prevention and liquid drainage, and judging that the content of the chlorine ions tested for three consecutive days is basically stable when the discharged liquid is qualified.
Description
The technical field is as follows:
the invention relates to an oil field fracturing operation method, in particular to a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir.
Background art:
in the middle and later stages of oil field development, a plurality of oil wells have high water content, particularly ultra-low permeability oil reservoirs, water breakthrough is faster, even in the early stage of development, part of the wells have high water content, and conventional fracturing and volume fracturing have better effect when put into production or the deep part of the oil well is blocked, but for the conventional fracturing of the high water content wells again, only water injection channels can be enlarged, so that water logging is caused. The existing technology for plugging old seams and pressing new seams of the ultra-low permeability reservoir is in the testing stage, the current situation that plugging and pressing are carried out exists, and the fracturing fluid cannot be divided to be pressed out of new seams again. Therefore, a gel foam temporary plugging and flow splitting fracturing method for an ultra-low permeability reservoir needs to be developed.
The invention content is as follows:
the invention aims to provide a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir, which solves the problem that old cracks are pressed open again after being plugged during fracturing construction, is suitable for an ultra-low permeability heterogeneous reservoir, can enter and plug cracks and pore passages, avoids being pressed open, and provides a better method for effective fracturing of an oil field.
In order to achieve the purpose, the invention adopts the technical scheme that:
a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir is characterized by comprising the following steps: the method comprises the following steps:
opening a sleeve valve, and slowly injecting active water;
injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of below 0.5 square/minute to plug the seam end;
injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 0.5-2 square/minute to block pore throats and seam bands;
injecting gel foam temporary plugging diversion liquid of the ultra-low permeability reservoir at a low speed of 0.5-2 square/min, filling pore zones among particles, plugging gaps, and buffering fracturing pressure;
step five, sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a large displacement speed of 2-4 square/minute;
and step six, closing the well for 30 minutes, performing blowout prevention and liquid drainage, and determining that the content of the chloride ions tested in the discharged liquid is basically stable for three consecutive days, namely the discharged liquid is qualified.
The active water comprises the following components in percentage by mass of 100 percent: 15-25% of a clay stabilizer, 5-8% of a cleanup additive and the balance of water, wherein the clay stabilizer is dodecyl dimethyl benzyl ammonium chloride and ammonium chloride in a mass ratio of 2: 1-3: 1, and 5-8% of cleanup additive is fluorocarbon surfactant and nonionic surfactant according to the mass ratio of 1: 1-1.5: 1 is obtained by compounding.
The gel foam base fluid for the ultra-low permeability reservoir comprises the following components in percentage by mass: 8-12% of polyacrylamide, 5-8% of acrylic acid, 2-4% of acrylonitrile, 0.05-0.1% of o-phenylenediamine, 0.5-0.8% of initiator ammonium persulfate, 0.05-0.1% of surfactant sodium dodecyl benzene sulfonate, 0.8-1.0% of cross-linking agent N, N-methylene acrylamide, 2-3% of thickening agent hydroxypropyl guar gum and the balance of water, and the components are copolymerized at 120-150 ℃ to form the acrylic acid modified acrylic acid, the viscosity of the acrylic acid modified acrylic acid is 180-200 mPa.
The gel foam particles for the ultra-low permeability reservoir comprise the following components in parts by mass: 20-30% of mixed powder, 20-30% of phenolic resin, 7-15% of reinforcing agent nano silicon dioxide, 2-5% of resin binder, 0.5-2% of curing agent inorganic acid, 2-15% of foaming agent alkylphenol polyoxyethylene ether and 10-20% of nonionic surfactant, wherein the mixed powder is prepared by mixing waste rock core powder and coal powder in any proportion;
the preparation method of the gel foam particles for the ultra-low permeability reservoir comprises the following steps: the powder, the phenolic resin, the reinforcing agent, the binder, the curing agent, the foaming agent and the surfactant are mixed and stirred uniformly, poured into a preheated mold quickly for foaming and curing, and particles with the particle size of 0.1-0.5 mm are prepared.
The gel foam temporary plugging diverting fluid for the ultra-low permeability reservoir comprises the following components in percentage by mass of 100 percent: 7-10.0% of composite crosslinked polymer gel, 0.015-1.50% of composite foaming agent and the balance of water, wherein the volume ratio of gas to the composite crosslinked polymer gel is 50-200: 1, and the gas is nitrogen gas;
the composite cross-linked polymer gel comprises the following components in percentage by mass of 100 percent: 8-12% of polyacrylamide, 4-5% of acrylic acid, 3-4% of benzoic acid, 0.5-0.8% of initiator ammonium persulfate, 0.02-0.04% of a set accelerating regulator inorganic ammonium salt, 1-1.2% of a cross-linking agent phenolic resin, 0.3-0.5% of a catalyst, 0.2-0.3% of a stabilizer and the balance of white oil, wherein the catalyst is propylene oxide, the stabilizer is polyacrylamide, free radical polymerization is carried out by taking a water-in-oil emulsion template as a micro-reaction container, and the gel viscosity is 180-200 mPa & S;
the composite foaming agent is a sulfonic anionic surfactant, alkylphenol ethoxylates and acrylic acid-vinyl pyrimidine copolymer, and the mass ratio of the anionic surfactant to the alkylphenol ethoxylates is 3-5: 1-1.5: 0.5-1 mixing and compounding.
The pad fluid and the sand carrying fluid are cross-linked guar gum, the cross-linked guar gum consists of a cross-linked guar gum base fluid and a cross-linking fluid, and the cross-linking ratio of the two is 100: 8-100: 12; the cross-linked guanidine gum base fluid comprises the following components in 100% by mass: 12-15% of hydroxypropyl guar gum, 0.5-1% of bactericide, 5-7% of cleanup additive, 5-7% of clay stabilizer ammonium chloride, 3-5% of regulator and the balance of water; wherein the bactericide is sodium dichloroisocyanurate; the cleanup additive is JM-3; the regulator is prepared by mixing acetic acid and fumaric acid according to a mass ratio of 1: 1-1: 1.2 mixing and compounding; the crosslinking liquid comprises the following components in 100 percent by mass: 8-12% of hydroxypropyl guar gum, 20-40% of ammonium persulfate and the balance of water.
The displacing liquid is active water, and the displacing liquid is active water,
in the construction of the gel foam temporary plugging diversion fluid of the ultra-low permeability reservoir, the polymer gel base fluid is injected into the underground, and then the nitrogen is directly injected.
Compared with the prior art, the invention has the following advantages and effects:
compared with the conventional temporary plugging fracturing technology, the gel foam temporary plugging and shunting fracturing method realizes plugging of old fractures, avoids the phenomena of blocking and secondary pressing of old fractures by multi-stage plugging and pressure buffering of shunting liquid, gel particles and base liquid, and provides a new method for reducing water content and improving recovery ratio of an oil field.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. The implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in routine experiments.
The invention relates to a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir, which comprises the following concrete implementation steps of:
(1) opening a sleeve valve and slowly injecting active water;
(2) injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of below 0.5 square/minute to plug the seam end;
(3) injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 0.5-2 square/min to block pore throats and seam bands;
(4) injecting gel foam temporary plugging diversion liquid into the ultra-low permeability reservoir at a low speed of 0.5-2 square/min, filling inter-particle pore zones, plugging gaps, and buffering fracturing pressure;
(5) sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a large displacement speed of 2-4 square/min;
(6) and closing the well for 30 minutes, performing blowout prevention and liquid drainage, and judging that the content of the chlorine ions tested for three consecutive days is basically stable when the discharged liquid is qualified.
The active water is mainly composed of the following components in 100 percent of mass fraction: 15-25% of a clay stabilizer is dodecyl dimethyl benzyl ammonium chloride and ammonium chloride according to a mass ratio of 2: 1-3: 1, and 5-8% of cleanup additive is sodium perfluorosulfonate and alkylphenol polyoxyethylene ether according to the mass ratio of 1: 1-1.5: 1, the rest is water.
The gel foam base fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass: 8-12% of polyacrylamide, 5-8% of acrylic acid, 2-4% of acrylonitrile, 0.05-0.1% of o-phenylenediamine, 0.5-0.8% of initiator ammonium persulfate, 0.05-0.1% of surfactant sodium dodecyl benzene sulfonate, 0.8-1.0% of cross-linking agent N, N-methylene acrylamide, 2-3% of thickening agent hydroxypropyl guar gum and the balance of water, and the components are copolymerized at 120-150 ℃ to form the acrylic acid modified acrylic acid, the viscosity of the acrylic acid modified acrylic acid is 180-200 mPa.
The gel foam particles for the ultra-low permeability reservoir mainly comprise the following components in parts by mass: 20 to 30 percent of mixed powder (waste rock core powder and coal powder are mixed in any proportion), 20 to 30 percent of phenolic resin, 7 to 15 percent of reinforcing agent nano silicon dioxide, 2 to 5 percent of resin binder, 0.5 to 2 percent of curing agent sulfuric acid, 2 to 15 percent of foaming agent alkylphenol polyoxyethylene ether and 10 to 20 percent of nonionic surfactant polyoxyethylene amide.
The preparation method of the gel foam particles comprises the following steps: the powder, the phenolic resin, the reinforcing agent, the binder, the curing agent, the foaming agent and the surfactant are mixed and stirred uniformly, poured into a preheated mold quickly for foaming and curing, and particles with the particle size of 0.1-0.5 mm are prepared.
The gel foam temporary plugging diverting fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass of 100 percent: 7-10.0% of composite cross-linked polymer gel (based on 100% of mass fraction, the gel mainly comprises 8-12% of polyacrylamide, 4-5% of acrylic acid, 3-4% of benzoic acid, 0.5-0.8% of initiator ammonia persulfate, 0.02-0.04% of inorganic ammonium potassium serving as a coagulation accelerator regulator, 1-1.2% of cross-linking agent phenolic resin, 0.3-0.5% of propylene oxide, 0.2-0.3% of polyacrylamide and the balance of white oil, and is subjected to free radical polymerization by using a water-in-oil emulsion template as a micro-reaction container, wherein the gel is 180-200 mPa.S.), a composite foaming agent (a mixture of sulfonic anionic surfactant, alkylphenol polyoxyethylene ether and acrylic acid-vinyl pyrimidine copolymer according to the mass ratio of 3-5: 1-1.5: 0.5-1) 0.015-1.50% of the balance of water, and the volume ratio of nitrogen gas to the foam gel water plugging agent is 50-200: 1, the construction steps are that polymer gel base fluid is injected into the well, and then nitrogen is directly injected. The pad fluid and the sand carrying fluid are cross-linked guar gum, the cross-linked guar gum mainly comprises cross-linked guar gum base fluid and cross-linked fluid, and the cross-linking ratio of the two is 100: 8-100: 12.
the cross-linked guanidine gum base fluid mainly comprises the following components in percentage by mass of 100 percent: 12-15% of hydroxypropyl guar gum, 0.5-1% of sodium dichloroisocyanurate, 5-7% of JM-3 cleanup additive (the manufacturer is Haiboan Kaiyuan Co., Ltd.), 5-7% of clay stabilizer ammonium chloride, 3-5% of regulator and the balance of water. The regulator is prepared by mixing acetic acid and fumaric acid according to a mass ratio of 1: 1-1: 1.2 mixing and compounding. The crosslinking liquid is mainly composed of the following components in 100% by mass fraction: 8-12% of hydroxypropyl guar gum, 20-40% of ammonium persulfate and the balance of water.
Example 1:
the invention relates to a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir, which comprises the following concrete implementation steps of:
(1) opening a sleeve valve and slowly injecting active water;
(2) injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of 0.2 square/minute to plug the seam end;
(3) injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 0.5 square/minute to block pore throats and seams;
(4) injecting gel foam temporary plugging diversion liquid of the ultra-low permeability reservoir at a low speed of 0.5 square/minute, filling inter-particle pore zones and plugging gaps, and buffering fracturing pressure;
(5) sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a high displacement speed of 2 square/minute;
(6) and closing the well for 30 minutes, performing blowout prevention and liquid drainage, and judging that the content of the chlorine ions tested for three consecutive days is basically stable when the discharged liquid is qualified.
The active water is mainly composed of the following components in 100 percent of mass fraction: the 15% clay stabilizer is dodecyl dimethyl benzyl ammonium chloride and ammonium chloride according to the mass ratio of 2: 1 (the concentration of the solution is 3%), and 5% of cleanup additive is sodium perfluorosulfonate and alkylphenol polyoxyethylene ether according to the mass ratio of 1: 1, the rest is water.
The gel foam base fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass: 8 percent of polyacrylamide, 5 percent of acrylic acid, 2 percent of acrylonitrile, 0.05 percent of o-phenylenediamine, 0.5 percent of initiator ammonia persulfate, 0.05 percent of surfactant sodium dodecyl benzene sulfonate, 0.8 percent of cross-linking agent N, N- - -methylene acrylamide, 2 percent of thickening agent hydroxypropyl guar gum and the balance of water, and the components are copolymerized at 120 to obtain the acrylic acid modified acrylic acid with the viscosity of 180 mPa.S.
The gel foam particles for the ultra-low permeability reservoir mainly comprise the following components in parts by mass: 20 percent (the waste rock core powder and the coal powder are mixed in any proportion), 20 percent of phenolic resin, 7 percent of reinforcing agent nano silicon dioxide, 2 percent of resin binder, 0.5 percent of curing agent sulfuric acid, 2 percent of foaming agent alkylphenol polyoxyethylene ether and 10 percent of nonionic surfactant polyoxyethylene amide.
The preparation method of the gel foam particles comprises the following steps: mixing and stirring the powder, the phenolic resin, the reinforcing agent, the binder, the curing agent, the foaming agent and the surfactant uniformly, quickly pouring the mixture into a preheated die for foaming and curing to prepare particles with the particle size of 0.1 mm.
The gel foam temporary plugging diverting fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass of 100 percent: 7 percent of composite cross-linked polymer gel (calculated by 100 percent of mass fraction, the gel mainly comprises 8 percent of polyacrylamide, 4 percent of acrylic acid, 3 percent of benzoic acid, 0.5 percent of initiator ammonium persulfate, 0.02 percent of inorganic ammonium potassium of a coagulation accelerator regulator, 1 percent of cross-linking agent phenolic resin, 0.3 percent of propylene oxide, 0.2 percent of polyacrylamide and the balance of white oil, the free radical polymerization is carried out by taking a water-in-oil emulsion template as a micro-reaction container, the gel viscosity is 180 mPa.S.), 0.015 percent of composite foaming agent (the mixture of sulfonic anionic surfactant, alkylphenol polyoxyethylene ether and acrylic acid-vinyl pyrimidine copolymer is mixed and compounded according to the mass ratio of 3: 1: 0.5), and the balance of water, the volume ratio of nitrogen gas to the composite cross-linked polymer gel is 50:1, and the construction steps are that the polymer gel base fluid is injected into a well and then nitrogen gas is directly injected into the well. The pad fluid and the sand carrying fluid are cross-linked guar gum, the cross-linked guar gum mainly comprises cross-linked guar gum base fluid and cross-linked fluid, and the cross-linking ratio of the two is 100: 8.
the cross-linked guanidine gum base fluid mainly comprises the following components in percentage by mass of 100 percent: 12% of hydroxypropyl guar gum, 0.5% of sodium dichloroisocyanurate, 5% of JM-3 cleanup additive (the manufacturer is Hubei Zhongtian Kaiyuan Co., Ltd.), 5% of clay stabilizer ammonium chloride, 3% of regulator and the balance of water. The regulator is prepared by mixing acetic acid and fumaric acid according to a mass ratio of 1: 1 are mixed and compounded. The crosslinking liquid is mainly composed of the following components in 100% by mass fraction: 8% of hydroxypropyl guar gum, 20% of ammonium persulfate and the balance of water.
Example 2:
the invention relates to a gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir, which comprises the following concrete implementation steps of:
(1) opening a sleeve valve and slowly injecting active water;
(2) injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of below 0.5 square/minute to plug the seam end;
(3) injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 2 square/min to block pore throats and seams;
(4) injecting gel foam temporary plugging diversion liquid of the ultra-low permeability reservoir at a low speed of 2 square/min, filling inter-particle pore zones and plugging gaps, and buffering fracturing pressure;
(5) sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a high displacement speed of 4 square/minute;
(6) and closing the well for 30 minutes, performing blowout prevention and liquid drainage, and judging that the content of the chlorine ions tested for three consecutive days is basically stable when the discharged liquid is qualified.
The active water is mainly composed of the following components in 100 percent of mass fraction: the 25% clay stabilizer is dodecyl dimethyl benzyl ammonium chloride and ammonium chloride according to the mass ratio of 3: 1 (the concentration of the solution is 2%), 8% of cleanup additive is sodium perfluorosulfonate and alkylphenol polyoxyethylene ether according to the mass ratio of 1.5: 1, the rest is water.
The gel foam base fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass: 12 percent of polyacrylamide, 8 percent of acrylic acid, 4 percent of acrylonitrile, 0.1 percent of o-phenylenediamine, 0.8 percent of initiator ammonia persulfate, 0.1 percent of surfactant sodium dodecyl benzene sulfonate, 1.0 percent of cross-linking agent N, N-methylene acrylamide, 3 percent of thickening agent hydroxypropyl guar gum and the balance of water, and the acrylic acid modified polyacrylamide copolymer is prepared by copolymerization at 150 ℃ and has the viscosity of 200 mPa.S.
The gel foam particles for the ultra-low permeability reservoir mainly comprise the following components in parts by mass: 30% of mixed powder (waste rock core powder and coal powder are mixed in any proportion), 30% of phenolic resin, 15% of reinforcing agent nano silicon dioxide, 5% of resin binder, 2% of curing agent sulfuric acid, 15% of foaming agent alkylphenol polyoxyethylene ether and 20% of nonionic surfactant polyoxyethylene amide.
The preparation method of the gel foam particles comprises the following steps: mixing and stirring the powder, the phenolic resin, the reinforcing agent, the binder, the curing agent, the foaming agent and the surfactant uniformly, quickly pouring the mixture into a preheated die for foaming and curing to prepare particles with the particle size of 0.5 mm.
The gel foam temporary plugging diverting fluid for the ultra-low permeability reservoir mainly comprises the following components in percentage by mass of 100 percent: 10.0 percent of composite cross-linked polymer gel (based on 100 percent of mass fraction, the gel mainly comprises 12 percent of polyacrylamide, 5 percent of acrylic acid, 4 percent of benzoic acid, 0.8 percent of initiator ammonia persulfate, 0.04 percent of inorganic ammonium potassium of coagulation accelerator regulator, 1.2 percent of cross-linking agent phenolic resin, 0.5 percent of propylene oxide, 0.3 percent of polyacrylamide and the balance of white oil, the free radical polymerization is carried out by taking a water-in-oil emulsion template as a micro-reaction container, the gel viscosity is 200 mPa.S.), 1.50 percent of composite foaming agent (sulfonic anionic surfactant, alkylphenol polyoxyethylene ether and acrylic acid-vinyl pyrimidine copolymer are mixed and compounded according to the mass ratio of 5: 1.5: 1), the balance of water, the volume ratio of nitrogen gas to the foam gel water plugging profile control agent is 200:1, and the construction steps comprise injecting polymer gel base fluid into a well and then directly injecting nitrogen. The pad fluid and the sand carrying fluid are cross-linked guar gum, the cross-linked guar gum mainly comprises cross-linked guar gum base fluid and cross-linked fluid, and the cross-linking ratio of the two is 100: 12.
the cross-linked guanidine gum base fluid mainly comprises the following components in percentage by mass of 100 percent: 15% of hydroxypropyl guar gum, 1% of sodium dichloroisocyanurate, 7% of JM-3 cleanup additive (the manufacturer is Hubei Zhongtian Kaiyuan Co., Ltd.), 7% of clay stabilizer ammonium chloride, 5% of regulator and the balance of water. The regulator is prepared by mixing acetic acid and fumaric acid according to a mass ratio of 1: 1.2 mixing and compounding. The crosslinking liquid is mainly composed of the following components in 100% by mass fraction: 12% of hydroxypropyl guar gum, 40% of ammonium persulfate and the balance of water.
The above embodiments are merely illustrative of the principles and effects of the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the present invention, and the scope of the present invention is defined by the appended claims.
Case of field test
Case 1: (preparation of slug systems Using the procedure of example 1)
The Hou 134-XX well is located in a western encrypted region of a large ultra-low permeability oil and gas field in China, and is put into production in 8 months in 2008, and C6 is produced1 1-2、C101 3Initial daily liquid production of 5.11m31.66t of daily oil, 61.3 percent of water and 367m of working fluid, and the productivity is stabilized to about 0.70t after taking effect. The daily production of the well slowly decreases beginning at 1 month of 2015; hole C6 for 2016 (9 months)1 1-3Post-layer commingled production C61 1-2Length 61 1-3Layer (lower bridge plug 1470m C101 3Layer), the oil quantity is stabilized at about 1t after taking effect; reducing the liquid and oil amount to dynamic state before pore-filling fracturing from 8 months in 2017, and performing gel foam temporary plugging and flow splitting fracturing construction on the well in order to recover the well productivity; daily liquid production 1.52m before construction30.42t of daily oil production, 68.1 percent of water, 960m of working fluid level and 91260mg/l of salt, and after the measures are implemented, the daily oil production is increased by 3m after the well measures are implemented3And the average daily oil increase is more than 2t, the effective period is 235 days, a good measure effect is obtained, and the oil well capacity is recovered.
Case 2: (preparation of slug systems Using the procedure of example 2)
The Wangjia 25-XXX well is a production well of a large ultra-low permeability oil and gas field A oil production plant in China, and is put into production in 12 months in 2011 to produce C61 1-2Daily liquid of 4.24m at the initial stage of layer and production31.92t of daily oil, and 46.1 percent of water; in 2018, in 9 months, due to high water cut, the accumulated oil yield is 0.1026 multiplied by 104t, and the accumulated water yield is 0.5796 multiplied by 104m3. In order to recover the production capacity of the well, the gel foam temporary plugging diversion fracturing technology is carried out on the well to improve the productivity of a single well, the residual oil in the area is used, after the measure, the productivity of the well is recovered, the daily oil increment is 2.53t, the water content is reduced to 36.7 percent, and a better measure effect is achieved.
Claims (8)
1. A gel foam temporary plugging and shunting fracturing method for an ultra-low permeability reservoir is characterized by comprising the following steps: the method comprises the following steps:
opening a sleeve valve, and slowly injecting active water;
injecting gel foam base fluid of the ultra-low permeability reservoir at a low speed of below 0.5 square/minute to plug the seam end;
injecting gel foam particles of the ultra-low permeability reservoir at a low speed of 0.5-2 square/minute to block pore throats and seam bands;
injecting gel foam temporary plugging diversion liquid of the ultra-low permeability reservoir at a low speed of 0.5-2 square/min, filling pore zones among particles, plugging gaps, and buffering fracturing pressure;
step five, sequentially injecting the pad fluid, the sand carrying fluid and the displacing fluid at a large displacement speed of 2-4 square/minute;
and step six, closing the well for 30 minutes, performing blowout prevention and liquid drainage, and determining that the content of the chloride ions tested in the discharged liquid is basically stable for three consecutive days, namely the discharged liquid is qualified.
2. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that: the active water comprises the following components in percentage by mass of 100 percent: 15-25% of a clay stabilizer, 5-8% of a cleanup additive and the balance of water, wherein the clay stabilizer is dodecyl dimethyl benzyl ammonium chloride and ammonium chloride in a mass ratio of 2: 1-3: 1, and 5-8% of cleanup additive is fluorocarbon surfactant and nonionic surfactant according to the mass ratio of 1: 1-1.5: 1 is obtained by compounding.
3. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that: the gel foam base fluid for the ultra-low permeability reservoir comprises the following components in percentage by mass: 8-12% of polyacrylamide, 5-8% of acrylic acid, 2-4% of acrylonitrile, 0.05-0.1% of o-phenylenediamine, 0.5-0.8% of initiator ammonium persulfate, 0.05-0.1% of surfactant sodium dodecyl benzene sulfonate, 0.8-1.0% of cross-linking agent N, N-methylene acrylamide, 2-3% of thickening agent hydroxypropyl guar gum and the balance of water, and the components are copolymerized at 120-150 ℃ to form the acrylic acid modified acrylic acid, the viscosity of the acrylic acid modified acrylic acid is 180-200 mPa.
4. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that:
the gel foam particles for the ultra-low permeability reservoir comprise the following components in parts by mass: 20-30% of mixed powder, 20-30% of phenolic resin, 7-15% of reinforcing agent nano silicon dioxide, 2-5% of resin binder, 0.5-2% of curing agent inorganic acid, 2-15% of foaming agent alkylphenol polyoxyethylene ether and 10-20% of nonionic surfactant, wherein the mixed powder is prepared by mixing waste rock core powder and coal powder in any proportion;
the preparation method of the gel foam particles for the ultra-low permeability reservoir comprises the following steps: the powder, the phenolic resin, the reinforcing agent, the binder, the curing agent, the foaming agent and the surfactant are mixed and stirred uniformly, poured into a preheated mold quickly for foaming and curing, and particles with the particle size of 0.1-0.5 mm are prepared.
5. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that:
the gel foam temporary plugging diverting fluid for the ultra-low permeability reservoir comprises the following components in percentage by mass of 100 percent: 7-10.0% of composite crosslinked polymer gel, 0.015-1.50% of composite foaming agent and the balance of water, wherein the volume ratio of gas to the composite crosslinked polymer gel is 50-200: 1, and the gas is nitrogen gas;
the composite cross-linked polymer gel comprises the following components in percentage by mass of 100 percent: 8-12% of polyacrylamide, 4-5% of acrylic acid, 3-4% of benzoic acid, 0.5-0.8% of initiator ammonium persulfate, 0.02-0.04% of a set accelerating regulator inorganic ammonium salt, 1-1.2% of a cross-linking agent phenolic resin, 0.3-0.5% of a catalyst, 0.2-0.3% of a stabilizer and the balance of white oil, wherein the catalyst is propylene oxide, the stabilizer is polyacrylamide, free radical polymerization is carried out by taking a water-in-oil emulsion template as a micro-reaction container, and the gel viscosity is 180-200 mPa & S;
the composite foaming agent is a sulfonic anionic surfactant, alkylphenol ethoxylates and acrylic acid-vinyl pyrimidine copolymer, and the mass ratio of the anionic surfactant to the alkylphenol ethoxylates is 3-5: 1-1.5: 0.5-1 mixing and compounding.
6. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that:
the pad fluid and the sand carrying fluid are cross-linked guar gum, the cross-linked guar gum consists of a cross-linked guar gum base fluid and a cross-linking fluid, and the cross-linking ratio of the two is 100: 8-100: 12; the cross-linked guanidine gum base fluid comprises the following components in 100% by mass: 12-15% of hydroxypropyl guar gum, 0.5-1% of bactericide, 5-7% of cleanup additive, 5-7% of clay stabilizer ammonium chloride, 3-5% of regulator and the balance of water; wherein the bactericide is sodium dichloroisocyanurate; the cleanup additive is JM-3; the regulator is prepared by mixing acetic acid and fumaric acid according to a mass ratio of 1: 1-1: 1.2 mixing and compounding; the crosslinking liquid comprises the following components in 100 percent by mass: 8-12% of hydroxypropyl guar gum, 20-40% of ammonium persulfate and the balance of water.
7. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that: the displacing liquid is active water.
8. The ultra-low permeability reservoir gel foam temporary plugging and flow splitting fracturing method of claim 1, characterized in that: in the construction of the gel foam temporary plugging diversion fluid of the ultra-low permeability reservoir, the polymer gel base fluid is injected into the underground, and then the nitrogen is directly injected.
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