CN116265564A - Foam system for clastic rock oil reservoir and preparation method thereof - Google Patents
Foam system for clastic rock oil reservoir and preparation method thereof Download PDFInfo
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- CN116265564A CN116265564A CN202111554322.7A CN202111554322A CN116265564A CN 116265564 A CN116265564 A CN 116265564A CN 202111554322 A CN202111554322 A CN 202111554322A CN 116265564 A CN116265564 A CN 116265564A
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- Prior art keywords
- foam
- hydroxysulfobetaine
- polyvinyl alcohol
- chain
- carbon
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- 239000006260 foam Substances 0.000 title claims abstract description 193
- 239000011435 rock Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 33
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 121
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 121
- 239000002245 particle Substances 0.000 claims abstract description 116
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000004088 foaming agent Substances 0.000 claims abstract description 71
- 239000007788 liquid Substances 0.000 claims abstract description 59
- 238000005187 foaming Methods 0.000 claims abstract description 52
- 239000003381 stabilizer Substances 0.000 claims abstract description 50
- 238000013329 compounding Methods 0.000 claims abstract description 14
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 28
- 239000003054 catalyst Substances 0.000 claims description 23
- 150000003839 salts Chemical class 0.000 claims description 22
- 229920006037 cross link polymer Polymers 0.000 claims description 20
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 10
- JIRHAGAOHOYLNO-UHFFFAOYSA-N (3-cyclopentyloxy-4-methoxyphenyl)methanol Chemical compound COC1=CC=C(CO)C=C1OC1CCCC1 JIRHAGAOHOYLNO-UHFFFAOYSA-N 0.000 claims description 6
- 150000001299 aldehydes Chemical class 0.000 claims description 6
- 229940015043 glyoxal Drugs 0.000 claims description 6
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 4
- ZWLUXSQADUDCSB-UHFFFAOYSA-N phthalaldehyde Chemical compound O=CC1=CC=CC=C1C=O ZWLUXSQADUDCSB-UHFFFAOYSA-N 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- CVLHGLWXLDOELD-UHFFFAOYSA-N 4-(Propan-2-yl)benzenesulfonic acid Chemical compound CC(C)C1=CC=C(S(O)(=O)=O)C=C1 CVLHGLWXLDOELD-UHFFFAOYSA-N 0.000 claims 1
- 239000004094 surface-active agent Substances 0.000 abstract description 23
- 230000000087 stabilizing effect Effects 0.000 abstract description 20
- 150000001875 compounds Chemical class 0.000 abstract description 16
- 230000003993 interaction Effects 0.000 abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 5
- 230000003111 delayed effect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000000499 gel Substances 0.000 description 45
- 239000000243 solution Substances 0.000 description 43
- 239000003921 oil Substances 0.000 description 40
- 239000006185 dispersion Substances 0.000 description 24
- 125000000217 alkyl group Chemical group 0.000 description 22
- 239000007789 gas Substances 0.000 description 22
- 230000005465 channeling Effects 0.000 description 19
- 239000000084 colloidal system Substances 0.000 description 17
- 239000003292 glue Substances 0.000 description 16
- 238000006073 displacement reaction Methods 0.000 description 15
- -1 alkyl alcohol ether carboxylate Chemical class 0.000 description 14
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 description 10
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 10
- 229960003237 betaine Drugs 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 10
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 description 9
- 230000033558 biomineral tissue development Effects 0.000 description 9
- 230000033228 biological regulation Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 230000035699 permeability Effects 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 7
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910001425 magnesium ion Inorganic materials 0.000 description 6
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910001424 calcium ion Inorganic materials 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 5
- JBVOQKNLGSOPNZ-UHFFFAOYSA-N 2-propan-2-ylbenzenesulfonic acid Chemical compound CC(C)C1=CC=CC=C1S(O)(=O)=O JBVOQKNLGSOPNZ-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000004604 Blowing Agent Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 3
- 239000002280 amphoteric surfactant Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 125000002463 lignoceryl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 150000007942 carboxylates Chemical group 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- RZXLPPRPEOUENN-UHFFFAOYSA-N Chlorfenson Chemical compound C1=CC(Cl)=CC=C1OS(=O)(=O)C1=CC=C(Cl)C=C1 RZXLPPRPEOUENN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 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
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 150000008052 alkyl sulfonates Chemical class 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 description 1
- 229940073507 cocamidopropyl betaine Drugs 0.000 description 1
- 229940071160 cocoate Drugs 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000013051 drainage agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 229940054441 o-phthalaldehyde Drugs 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229940117986 sulfobetaine Drugs 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
Classifications
-
- 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
- C09K8/58—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
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
Abstract
The invention discloses a foam system for clastic rock oil reservoirs and a preparation method thereof, wherein the foam system comprises 0.4-0.8wt% of foaming agent, 0.2-1.0wt% of foam stabilizer and the balance of water; the foaming agent is prepared by compounding short-carbon-chain hydroxysulfobetaine and long-carbon-chain hydroxysulfobetaine; the foam stabilizer is cross-linked polyvinyl alcohol particles. The compound of the short/long carbon chain hydroxysulfobetaine is used as a foaming agent, and the short carbon chain hydroxysulfobetaine in the compound system can be quickly adsorbed at a gas-liquid interface, is easy to foam and has large foaming volume; the long carbon chain hydroxysulfobetaine has good foam stabilizing capability due to long lipophilic, and the long carbon chain hydroxysulfobetaine can be adsorbed on a gas-liquid interface, and the long carbon chain hydroxysulfobetaine can be compounded to serve as a foaming agent, so that a foam liquid film has higher strength and foam is more stable. The polyvinyl alcohol particles are dispersed in the foam liquid film through the interaction between the hydroxyl groups on the surfaces of the polyvinyl alcohol particles and the surfactant, and the liquid film liquid discharge is delayed through the interaction and the space obstruction of the polyvinyl alcohol particles, so that the liquid film stability time is prolonged, and meanwhile, the mechanical strength of the liquid film is increased.
Description
Technical Field
The invention belongs to the field of petroleum exploitation, and relates to a foam system for clastic rock oil reservoirs and a preparation method thereof.
Background
Gas channeling has been a common problem in the development of gas flooding in oil fields, which can lead to gas flooding wave and volume reduction and affect recovery efficiency. The problem of gas channeling becomes particularly pronounced due to the severe degree of reservoir heterogeneity in deep clastic reservoirs. In order to improve the effect of the gas driving, the regulation and control of the gas channeling are needed. Foam can more easily enter the gas channeling channel and is often used to improve the gas channeling problem.
In order to meet the requirements of regulation and control of gas channeling of deep clastic rock oil reservoirs, the foaming agent has good foam performance under the conditions of high temperature and high salt. Many researchers have made many studies on temperature-resistant and salt-resistant foaming agents:
patent CN102212348A discloses a salt-tolerant and methanol-tolerant foam-removing agent which mainly comprises 20-40% of cocamidopropyl betaine, 45-65% of amine oxide, 5-20% of alpha-olefin sulfonate, 5-15% of triethanolamine, 0.2-2% of fluorocarbon surfactant and 0-5% of methanol, and can resist mineralization degree reaching 18 multiplied by 10 4 mg/L, but the agent contains fluorocarbon surfactant, so that the cost is greatly increased and the environmental impact is great. Patent CN102660251A discloses a system using anionic nonionic surfactants such as alkyl alcohol ether carboxylate and alkyl alcohol ether sulfonate as foaming agent, which is suitable for use at a temperature of not higher than 110deg.C and mineralization of not higher than 15X10 4 The channeling blocking and regulating displacement of the carbon dioxide displacement under the condition of mg/L stratum. Patent CN102399548B discloses a compound foam oil displacementWith a foaming agent comprising cocamidopropyl hydroxysulfonic acid betaine, cationic surfactant 1227 and dodecanol, and having a temperature of 50deg.C and a salt resistance of 8X10 4 mg/L. Patent CN103881683A discloses a temperature-resistant and salt-resistant system using carboxylic acid imidazoline type amphoteric surfactant, carboxybetaine amphoteric surfactant and alpha-olefin sulfonate as foaming agent, the system is at 80 ℃ and 10 multiplied by 10 4 The foaming volume can reach 650mL under the condition of mg/L mineralization, and the half life of the foam is more than 28 min. Patent CN103952132B discloses a salt synergistic heat-resistant salt-resistant foam system which mainly comprises 0.05-0.5% of foaming agent and 0.05-0.2% of foam stabilizer, wherein the foaming agent is formed by compounding a nonionic surfactant and an anionic nonionic surfactant according to a mass ratio of 6:1-9:1, and the foam stabilizer is one or a mixture of more than one of xanthan gum, hydroxyethyl cellulose and polyvinyl alcohol. The system has mineralization degree of 20×10 at 90deg.C 4 mg/L, calcium and magnesium ion concentration 1×10 4 Good foaming at mg/L and foam stability increased with increasing mineralization. Patent CN104109520B discloses a foaming agent suitable for high-temperature and high-salt oil reservoirs, which mainly comprises 50-70% of alkyl sulfonate and 10-15% of alkyl amine oxide. The invention evaluates the foaming capacity of the Roche foam apparatus, wherein the concentration of the foaming agent is 0.5%, the foaming capacity is 900-1000 ml, and the half life is 8-12 minutes under the conditions of the temperature of 95 ℃ and the mineralization degree of 100000-150000 mg/L. CN106318362B provides a novel carbon dioxide foaming agent for oil displacement, which mainly comprises 20% -70% of sodium alkylbenzenesulfonate, 10% -50% of diethanolamine cocoate and 10% -50% of hydroxypropyl sulfobetaine. Is suitable for oil reservoirs with the temperature of not higher than 150 ℃ and the mineralization degree of less than 80000mg/L and the calcium-magnesium ion concentration of less than 1000 mg/L. Patent CN106590573B discloses a salt-resistant drainage gas production foam drainage agent composition, and a preparation method and application thereof. The method mainly solves the problems of gas well yield reduction and even blowout stopping caused by excessive accumulated liquid in the development process of the existing gas well. The mole fraction meter comprises the following components: (1) 1 part of a long-chain polyether nitrogen-containing compound; (2) petroleum sulfonate 0.5-20 parts. The salt tolerance of the foaming system can reach 25 multiplied by 10 4 mg/L, but because the long-chain polyether nitrogen-containing compound in the system is oxidized with weak positive electricityTertiary amine surfactants have large adsorption capacity in formations with negatively charged surfaces and are not suitable for plugging gas channeling in clastic rock oil layers. Patent CN109777393B discloses a foam oil displacement agent suitable for high-temperature and high-salt oil reservoirs, which consists of 0.3-0.8% of foaming agent and 0.5-2.0% of foam stabilizer. The foaming agent comprises sulfopropyl polyoxyethylene dodecyl alcohol ether and oleamide hydroxysulfobetaine in a weight ratio of 2:1-1:3; the foam stabilizer is polyethylene glycol, and the relative molecular mass of the polyethylene glycol is 12000-20000. The foam oil displacement agent has the salt content of 22 multiplied by 10 at 130 DEG C 4 The stability is strong, the half life period is long under mg/L, and the recovery ratio of the high-temperature high-salt oil reservoir can be obviously improved. However, the sulfopropyl polyoxyethylene dodecyl alcohol ether used in the invention has no industrial product at present, and in addition, polyethylene glycol gradually loses foam stabilizing performance due to thermal degradation at 130 ℃.
From the currently reported temperature and salt tolerant blowing agents, most blowing agent systems do not perform adequately enough to support their use at temperatures greater than 130 ℃ and with a salt content of 250000mg/L in the formation. While in general the blowing agent system properties of interest are mainly the foaming efficacy and foam stability of the foaming system, i.e. the foaming volume and the foam residence time. From the molecular structure analysis, the longer the hydrophobic chains of the surfactant molecules, the greater the cohesive force between the chains, the greater the ability to block gas diffusion, i.e. the better the elasticity and mechanical strength of the foam liquid film, the more macroscopically stable the foam. However, too long a hydrophobic chain can result in too stiff a liquid film to reduce elasticity, while affecting the efficiency of the surfactant to reduce surface tension, reducing the foaming efficacy of the foaming system. When the hydrophobic chains of the surfactant molecules are shorter or branched, larger foaming volumes can be generated, but too short alkyl chains or branched chains can lead to insufficient cohesive force among the chains, and poor foam stability; in addition, to enhance the performance of the foaming agent under high temperature and high salt conditions, solid phase particles are often introduced into the foaming agent solution to improve the temperature and salt resistance of the foam. These solid phase particles include clays, nanosilicas, and the like. The clay has good foam stabilizing effect only when the clay is used in a high amount (the mass fraction is more than 1%) due to the large granularity, and has the problem of injection or not due to the poor deformation capability of the particles. The nano silicon dioxide with weak parent oil has good foam stabilizing capability, but has the problem of particle aggregation in a high-temperature high-salt medium. Patent CN104927825B discloses a nitrogen foam compound profile control and flooding system of a temperature-resistant salt-tolerant gel dispersion, wherein a foaming system of the nitrogen foam compound profile control and flooding system consists of 0.1-0.4% of foaming agent and 0.05-0.15% of foam stabilizer. Wherein the foam stabilizer is formed by forming gel by phenolic resin crosslinked nonionic polyacrylamide and then crushing the gel by colloid powder, and the particle size is 600 nm-3.3 mu m. The gel dispersion is easy to prepare and low in cost, so that the gel dispersion stable foam has a good application prospect. However, in the gel dispersion prepared by using polyacrylamide, amide groups in the gel dispersion can hydrolyze carboxylate groups at high temperature, and the carboxylate groups can react with a large amount of calcium and magnesium ions existing in brine, so that the gel dispersion of the polyacrylamide has adhesion or hardening phenomena, and the migration capacity and the foam stabilizing capacity can be greatly reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a foam system for clastic rock oil reservoirs and a preparation method thereof, and the system has excellent temperature resistance and salt resistance, so that the purpose of realizing the regulation and control of the gas channeling of deep clastic rock oil reservoirs is fulfilled.
The invention is realized by the following technical scheme:
a foam system for clastic rock oil reservoirs comprises 0.4-0.8wt% of foaming agent, 0.2-1.0wt% of foam stabilizer and the balance of water;
the foaming agent is prepared by compounding short-carbon-chain hydroxysulfobetaine and long-carbon-chain hydroxysulfobetaine;
the foam stabilizer is cross-linked polyvinyl alcohol particles.
Preferably, the short carbon chain hydroxysulfobetaine has a foaming rate of not less than 400% and the long carbon chain hydroxysulfobetaine has a foaming rate of less than 400%.
Preferably, the chain length of the short carbon chain hydroxysulfobetaine is 8-16, and the chain length of the long carbon chain hydroxysulfobetaine is 18-24.
Preferably, the mass ratio of the short carbon chain hydroxysulfobetaine to the long carbon chain hydroxysulfobetaine is 1.5:1-1:1.5.
Preferably, the particle size of the crosslinked polymer particles is 500nm to 10. Mu.m.
Preferably, the cross-linked polyvinyl alcohol particles are prepared from 3-10wt% of polyvinyl alcohol, 0.1-1wt% of aldehyde substances and 0.1-1wt% of catalyst.
Preferably, the aldehyde substance is at least one of formaldehyde, glyoxal, glutaraldehyde, terephthalaldehyde and o-phthalaldehyde.
Preferably, the catalyst is at least one of hydrochloric acid, p-toluenesulfonic acid, xylenesulfonic acid and isopropylbenzenesulfonic acid.
Preferably, the foam system phase has a foaming volume of greater than 402mL, a foam half-life of greater than 5.15 hours, a liquid separation half-life of greater than 5.05 minutes, and a foam resistance factor of greater than 176 at 150 ℃ and a salt content of 250000 mg/L.
A method for preparing a foam system for clastic oil reservoirs, comprising the steps of:
s1: mixing short-carbon-chain hydroxysulfobetaine with long-carbon-chain hydroxysulfobetaine, and heating in a water bath to obtain a foaming agent;
s2: adding formaldehyde into an aqueous solution of polyvinyl alcohol, uniformly stirring, adding a catalyst, stirring, standing to obtain polyvinyl alcohol gel, adding water into the polyvinyl alcohol gel, and crushing to obtain crosslinked polyvinyl alcohol particles;
s3: and mixing the foaming agent, the cross-linked polyvinyl alcohol particles and water to obtain the foam system.
Compared with the prior art, the invention has the following beneficial technical effects:
a foam system for clastic rock oil reservoirs adopts a compound of short-carbon-chain hydroxysulfobetaine and long-carbon-chain hydroxysulfobetaine as a foaming agent, and the adsorption quantity of the hydroxysulfobetaine on the surface of clastic rock is relatively small, so that the foam spreading is facilitated. The short carbon chain hydroxysulfobetaine in the compound system can be quickly adsorbed at the gas-liquid interface, is easy to foam and has large foaming volume; the long carbon chain hydroxysulfobetaine has better foam stabilizing capability due to long lipophilic, and the long carbon chain hydroxysulfobetaine can be adsorbed on a gas-liquid interface, and the long carbon chain hydroxysulfobetaine can be compounded to serve as a foaming agent to enable a foam liquid film to have higher strength, so that the macroscopic appearance is more stable. The polyvinyl alcohol particles can be adsorbed in the foam liquid film through the interaction between the hydroxyl groups on the surfaces of the polyvinyl alcohol particles and the surfactant, on one hand, liquid drainage of the liquid film can be delayed through the interaction and the space obstruction of the polyvinyl alcohol particles, and the liquid film stabilizing time is prolonged; on the other hand, it can increase the mechanical strength of the liquid film.
Furthermore, the chain length of the short carbon chain hydroxysulfobetaine is 8-16, the foaming stability of the surfactant with the carbon chain less than 8 is greatly reduced, the production cost is high, and the good foaming effect is difficult to ensure. The chain length of the long-carbon chain hydroxysulfobetaine is 18-24, the hydrophilicity of the betaine is reduced along with the increase of the alkyl chain, the solubility of the betaine in water is drastically reduced due to the long alkyl chain, the cloud point is reduced, and a stable product which can be produced industrially is difficult to prepare, so the chain length of the long-chain hydroxysulfobetaine is 18-24. Therefore, the chain length of the short carbon chain hydroxysulfobetaine is 8-16, and the chain length of the long carbon chain hydroxysulfobetaine is 18-24, so that the product performance is effectively ensured, and the cost can be effectively controlled.
Further, the mass ratio of the short carbon chain hydroxysulfobetaine to the long carbon chain hydroxysulfobetaine is 1.5:1-1:1.5, so that good foaming and foam stabilizing effects of the product can be ensured, and the stability of foam is ensured.
Further, the polyvinyl alcohol particles need to have a suitable particle size because they need to be stably present on the liquid film to function. The particle size is too small, so that the liquid film can easily move along with liquid discharge, and the bubble stabilizing capability is affected; the excessive particle size can cause certain pressure on the liquid film, and after the strength of the liquid film is insufficient or the liquid is discharged to a certain degree, the liquid film is crushed, thereby playing a role in reverse. The polyvinyl alcohol particles with the particle diameters of 500nm-10 mu m can effectively ensure the foam stabilizing effect.
The preparation method of the foam system for clastic rock oil reservoirs is convenient and simple, convenient to prepare and easy to produce in mass.
Detailed Description
So that those skilled in the art can appreciate the features and effects of the present invention, a general description and definition of the terms and expressions set forth in the specification and claims follows. Unless otherwise defined, 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 invention belongs, and in the event of a conflict, the present specification shall control.
The theory or mechanism described and disclosed herein, whether right or wrong, is not meant to limit the scope of the invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.
All features such as values, amounts, and concentrations that are defined herein in the numerical or percent ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values (including integers and fractions) within the range.
Herein, unless otherwise indicated, "comprising," "including," "having," or similar terms encompass the meanings of "consisting of … …" and "consisting essentially of … …," e.g., "a includes a" encompasses the meanings of "a includes a and the other and" a includes a only.
In this context, not all possible combinations of the individual technical features in the individual embodiments or examples are described in order to simplify the description. Accordingly, as long as there is no contradiction between the combinations of these technical features, any combination of the technical features in the respective embodiments or examples is possible, and all possible combinations should be considered as being within the scope of the present specification.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The following examples use instrumentation conventional in the art. The experimental methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The following examples used various starting materials, unless otherwise indicated, were conventional commercial products, the specifications of which are conventional in the art. In the description of the present invention and the following examples, "%" means weight percent, and "parts" means parts by weight, and ratios means weight ratio, unless otherwise specified.
As described in the background art, the existing foam system cannot meet the requirement of regulation and control of gas channeling of deep clastic rock oil reservoirs at 150 ℃ and 250000mg/L, and the invention provides a novel crosslinked polymer particle stable foam system. Simultaneously ensures the foaming efficiency and the foam stability of a foaming system and combines the temperature resistance and salt resistance of the alkyl hydroxysulfobetaine ampholytic surfactant. The nanometer or micrometer gel dispersion and the betaine amphoteric surfactant adopted by the invention have good synergistic effect of foaming and stable foaming, furthest improve the swept volume and wash oil efficiency of the foam compound profile control and flooding system, and can resist 130 ℃ and 17×10 total mineralization degree 4 mg/L, calcium ion resistance 1.0X10 4 mg/L, magnesium ion resistance 1.0X10 4 mg/L, the profile control and flooding effect of the high-temperature high-salinity oil reservoir can be improved to the greatest extent. Aiming at a high-temperature high-salt clastic rock oil reservoir, the invention provides a stable foam by cross-linking particles with nonionic polymers. The system has excellent temperature resistance and salt resistance, and can realize the purpose of regulating and controlling the gas channeling of deep clastic rock oil reservoirs.
The static and blocking properties of the foam system were evaluated in the following examples, wherein the static foam performance evaluation was performed in a high temperature high pressure foamer under conditions of 150℃and 3MPa, 100mL of a foamer solution was injected into the high temperature high pressure foamer during the test, and then stirred at a speed of 3000r/min for 1min, and the initial foam volume after completion of the stirring was the foam volume V f Then the foam volume was recorded and the foaming liquid was separated outTime when the volume of the precipitated foaming liquid reaches 50mL, the time is the half-life T of the precipitated liquid l The time when the foam volume is reduced to half the initial foam volume is the foam half-life T f . The foam plugging performance represents the foam gas channeling regulation capacity, the resistance factor measured by a core displacement experiment is used as a measure of the foam gas channeling regulation capacity, the experimental condition is 150 ℃, the back pressure is set to be 3MPa, the gas-liquid ratio in the experimental process is 9:1, the liquid injection speed is 0.5mL/min, and the resistance factor R is the same as the resistance factor F The ratio of the pressure difference between two ends of the rock core when the rock core is in balance during the movement of the foam to the pressure difference during the pure water injection is obtained.
Example 1
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.2% by mass of dodecyl hydroxysulfobetaine and 0.2% by mass of tetracosylhydroxysulfobetaine, taking the cross-linked polyvinyl alcohol particles with the mass of 0.2% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system is 425mL, the half-life period of the separation solution is 5.20min, and the foaming is measured by a high-temperature high-pressure foam instrumentFoam half-life was 5.35h. The permeability of the selected core in the core displacement experiment is 214 mu m 2 The resistance factor was measured to be 178.
Example 2
The foam system is prepared by compounding 0.24% by mass of dodecyl hydroxysulfobetaine and 0.16% by mass of tetracosyl hydroxysulfobetaine serving as a foaming agent, 0.2% by mass of cross-linked polyvinyl alcohol particles serving as a foam stabilizer, and mechanically mixing the foaming agent, the foam stabilizer and the balance of water.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system was 442mL, the half-life of the analytical solution was 5.05min, and the half-life of the foam was 5.15h as measured by a high temperature high pressure foam meter. The permeability of the selected core in the core displacement experiment is 232 mu m 2 The resistance factor was measured to be 176.
Example 3
The foam system is prepared by compounding 0.16% by mass of dodecyl hydroxysulfobetaine and 0.24% by mass of tetracosyl hydroxysulfobetaine serving as a foaming agent, 0.2% by mass of cross-linked polyvinyl alcohol particles serving as a foam stabilizer, and mechanically mixing the foaming agent, the foam stabilizer and the balance of water.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system was 402mL, the half-life of the analytical solution was 5.45min, and the half-life of the foam was 5.75h as measured by a high temperature high pressure foam meter. The core permeability selected in the core displacement experiment is 242 mu m 2 The resistance factor was measured to be 184.
Example 4
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.3% by mass of dodecyl hydroxysulfobetaine and 0.3% by mass of tetracosylhydroxysulfobetaine, taking the cross-linked polyvinyl alcohol particles with the mass of 0.2% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system is 454mL, the half-life of the analysis liquid is 5.75min, and the half-life of the foam is 5.85h as measured by a high-temperature high-pressure foam instrument. The permeability of the selected core in the core displacement experiment is 226 mu m 2 The resistance factor was measured to be 189.
Example 5
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.4% by mass of dodecyl hydroxysulfobetaine and 0.4% by mass of tetracosylhydroxysulfobetaine, taking the cross-linked polyvinyl alcohol particles with the mass of 0.2% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system is 478mL, the half-life of the analysis liquid is 5.95min, and the half-life of the foam is 6h as measured by a high-temperature high-pressure foam instrument. The permeability of the selected core in the core displacement experiment is 226 mu m 2 The resistance factor was measured to be 194.
Example 6
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.2% by mass of dodecyl hydroxysulfobetaine and 0.2% by mass of tetracosylhydroxysulfobetaine, taking the cross-linked polyvinyl alcohol particles with the mass of 0.6% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system was 416mL, the half-life of the analytical solution was 5.83min, and the half-life of the foam was 6.10h as measured by a high temperature high pressure foam meter. The core permeability selected in the core displacement experiment is 217 mu m 2 The resistance factor was measured to be 202.
Example 7
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.2% by mass of dodecyl hydroxysulfobetaine and 0.2% by mass of tetracosylhydroxysulfobetaine, taking crosslinked polyvinyl alcohol particles with the mass percentage of 1.0% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system was measured by a high temperature high pressure foam meter to be 405mL, the half-life of the analytical solution was 6.15min, and the half-life of the foam was 5.85h. The permeability of the selected core in the core displacement experiment is 209 mu m 2 The resistance factor was measured to be 212.
Example 8
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir is prepared by compounding 0.2% by mass of dodecyl hydroxysulfobetaine and 0.2% by mass of tetracosylhydroxysulfobetaine, taking crosslinked polyvinyl alcohol particles with the mass percentage of 1.0% as a foam stabilizer, and mechanically mixing the foam stabilizer, the foam stabilizer and the balance of water to obtain the foam system.
The preparation method of the foaming agent comprises the following steps: according to the proportion in the embodiment, the short carbon chain hydroxysulfobetaine and the long carbon chain hydroxysulfobetaine with the mass fraction of 35% are mixed, heated to 60 ℃ in a water bath, and then repeatedly oscillated for 100 times or stirred with a stirrer at the rotation speed of 200rad/min for 1 hour until the solution is uniform, so as to obtain a foaming agent concentrated solution with the effective content of 35%.
Wherein, the preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 5g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.2g of formaldehyde is added, stirred for 30min, then 0.2g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500 nm-10 mu m.
The foaming volume of the system was 418mL, the half-life of the analytical solution was 5.10min, and the half-life of the foam was 5.25h as measured by a high temperature high pressure foam meter. The permeability of the selected core in the core displacement experiment is 232 mu m 2 The resistance factor was measured to be 181.
Comparative example 1
The difference from example 1 is that: the foaming agent is only dodecyl hydroxysulfobetaine. The performance parameters of example 1 versus comparative example 1 are shown in Table 2. The experimental results show that the sample of comparative example 1 cannot simultaneously maintain the foaming capacity and the foam stabilizing capacity at the same time to reach higher levels, and the measured resistance factor is far lower than that of example 1, i.e. the channeling sealing capacity is far lower than that of example 1.
Comparative example 2
The difference from example 1 is that: the foaming agent is only tetracosyl hydroxysulfobetaine. The performance parameters of example 1 versus comparative example 2 are shown in Table 2. The experimental results show that the sample of comparative example 2 cannot simultaneously maintain the foaming capacity and the foam stabilizing capacity at the same time to reach higher levels, and the measured resistance factor is far lower than that of example 1, i.e. the channeling sealing capacity is far lower than that of example 1.
Comparative example 3
The difference from example 1 is that: the mass fraction of the foam stabilizer is zero, i.e. no foam stabilizer is added. The performance parameters of example 1 versus comparative example 3 are shown in Table 2. The experimental results show that the sample of comparative example 3 cannot simultaneously maintain the foaming capacity and the foam stabilizing capacity at the same time to reach higher levels, and the measured resistance factor is far lower than that of example 1, i.e. the channeling sealing capacity is far lower than that of example 1.
Example 9
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.4% of foaming agent, 0.2% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is eight carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is eighteen carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1.5:1. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 3g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.1g of formaldehyde is added, stirred for 30min, then 0.1g of hydrochloric acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the average particle size of 500 nm.
Example 10
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.5% of foaming agent, 0.3% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is eight carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is eighteen carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1.3:1. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 4g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, 0.2g of glyoxal is added after stirring for 30min for dissolution, 0.2g of p-toluenesulfonic acid is added as a catalyst after stirring for 30min, and stirring is carried out for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with average particle size of 700 nm.
Example 11
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.6% of foaming agent, 0.4% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is ten carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is twenty carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1.1:1. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 7g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.3g of glutaraldehyde is added, stirred for 30min, then 0.3g of xylenesulfonic acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with average particle size of 900 nm.
Example 12
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.7% of foaming agent, 0.6% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is twelve carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is twenty two carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1:1.1. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 8g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.7g of terephthalaldehyde is added, stirred for 30min, then 0.7g of isopropylbenzene sulfonic acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain crosslinked polyvinyl alcohol particles with average particle size of 1 mu m.
Example 13
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.8% of foaming agent, 0.8% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is sixteen carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is twenty-four carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1:1.3. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 10g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.8g of phthalic aldehyde is added, stirred for 30min, then 0.8g of a mixture of hydrochloric acid and p-toluenesulfonic acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain crosslinked polyvinyl alcohol particles with average particle size of 5 mu m.
Example 14
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises 0.9% of foaming agent, 0.8% of foam stabilizer and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, the alkyl of the short-carbon-chain hydroxysultaine is sixteen carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is twenty-four carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1:1.4. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 10g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 0.9g of mixture of formaldehyde and glyoxal is added, stirred for 30min, then 0.9g of mixture of hydrochloric acid and xylenesulfonic acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with average particle size of 7 mu m.
Example 15
A crosslinked polymer particle stable foam system suitable for a high-temperature high-salt clastic rock oil reservoir comprises a foaming agent with the mass percentage of 1.0%, a foam stabilizer with the mass percentage of 0.8% and the balance of water, wherein the foaming agent is a compound of short-carbon-chain hydroxysultaine and long-carbon-chain hydroxysultaine, wherein the alkyl of the short-carbon-chain hydroxysultaine is sixteen carbon chains, the alkyl of the long-carbon-chain hydroxysultaine is twenty-four carbon chains, and the mass percentage of the short-carbon-chain hydroxysultaine to the long-carbon-chain hydroxysultaine is 1:1.5. The foam stabilizer is cross-linked polyvinyl alcohol particles.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: 10g of polyvinyl alcohol 2488 is added into 94.6g of clear water at 60 ℃, stirred for 30min to dissolve, then 1g of mixture of formaldehyde, glyoxal and glutaraldehyde is added, stirred for 30min, then 1g of mixture of xylenesulfonic acid and isopropylbenzenesulfonic acid is added as a catalyst, and stirred for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain crosslinked polyvinyl alcohol particles with average particle size of 10 mu m.
The invention provides a crosslinked polymer particle stabilized foam system suitable for a high temperature high salt clastic rock oil reservoir, comprising: a blowing agent, cross-linked polymer particles, and water. The foaming agent comprises the following components in percentage by weight: 0.4 to 0.8 weight percent of foaming agent, 0.2 to 1.0 weight percent of cross-linked polymer particles and the balance of water.
The foaming agent is prepared by compounding short-carbon-chain hydroxysulfobetaine and long-carbon-chain hydroxysulfobetaine. Compared with carboxybetaine, the adsorption quantity of the hydroxysulfobetaine on the surface of clastic rock is relatively small, and the foam propagation is facilitated. Short carbon chain hydroxysulfobetaine in the compound system can be adsorbed on a gas-liquid interface rapidly, and is easy to foam (the foaming volume is large), but the foam stabilizing capability is poor due to the short lipophilic group; the long carbon chain hydroxysulfobetaine has low foaming capacity due to long lipophilic and slow adsorption speed at a gas-liquid interface, but has better foam stabilizing capacity once adsorbed at the gas-liquid interface, so that the long carbon chain hydroxysulfobetaine adopts the two as a foaming agent.
The chain length of the short carbon chain hydroxysulfobetaine is 8-16, preferably the carbon chain is 12; the chain length of the long carbon chain hydroxysulfobetaine is 18 to 24, preferably 24. The general ratio of short carbon chain hydroxysulfobetaine to long carbon chain hydroxysulfobetaine is 1.5:1 to 1:1.5, preferably 1:1.
The alkyl carbon chain length of the most common commercial hydroxysulfobetaines is twelve to twenty-four, and the lather performance of surfactants varies depending on the carbon chain length. Generally, the shorter the carbon chain length of betaine surfactant, the larger the foaming volume, but the shorter the hydrophobic chain, the weaker the interaction, the easier the flow, and the difficulty in maintaining the stability of the gas-liquid interface for a long time, so the generated foam has short stability time; along with the increase of the carbon chain length, the foaming volume of the betaine surfactant can be correspondingly reduced, but the interaction of the increased hydrophobic chain is greatly increased, the betaine surfactant can be stably distributed at a gas-liquid interface, the gas-liquid interface is stabilized for a long time, and the foam stability is obviously improved. With reference to the corresponding foam evaluation criteria, a foaming rate of 400% is taken as the foam foaming volume evaluation criteria, and in view of the above principle, a surfactant having a foaming volume higher than or close to 400% is referred to herein as a short carbon chain surfactant, whose alkyl carbon chain length is not more than 16. In addition, surfactants below twelve carbon chains are less commercially available, with 8-12 carbon surfactants being experimentally produced and found to have a foaming volume close to that of the surfactant. The foaming stability of the surfactant with the carbon chain smaller than 8 is greatly reduced, and the production cost is far higher than that of the existing industrialized products. Therefore, for performance and cost considerations, dodecyl hydroxysulfobetaine is selected as the optimal short carbon chain surfactant, and the short carbon chain hydroxysulfobetaine chain length is set to 8 to 16. The hydroxysulfobetaines with alkyl carbon chain lengths of not less than 18 and foaming rates of far less than 400% are collectively referred to as long carbon chain hydroxysulfobetaines. Along with the increase of alkyl chain, the hydrophilicity of betaine is also reduced, the solubility of betaine with long alkyl chain (more than 24) in water is reduced sharply, the cloud point is reduced, and stable product which can be produced in industrial scale is difficult to prepare, so the chain length of long-chain hydroxysulfobetaine is 18-24.
The cross-linked polymer particles are cross-linked polyvinyl alcohol particles with the granularity of 500nm-10 mu m.
The preparation method of the cross-linked polyvinyl alcohol particles comprises the following steps: adding polyvinyl alcohol 2488 into clear water at 60 ℃, stirring for 30min to dissolve, adding aldehyde substances, stirring for 30min, adding catalyst, and stirring for 10min. And (3) standing the prepared glue solution for 24 hours at room temperature to obtain the polyvinyl alcohol gel. Adding clear water with equal mass into a colloid mill of the gel dispersion device, and crushing for 10min at 3000r/min to obtain cross-linked polyvinyl alcohol particles with the granularity of 500nm-10 mu m.
In the preparation process of the polyvinyl alcohol gel, the mass fraction of the polyvinyl alcohol is generally 3-10%, preferably 5-7%; the aldehyde substance can be selected from one or more of formaldehyde, glyoxal, glutaraldehyde, terephthalaldehyde and phthalic aldehyde, and the mass fraction is generally 0.1-1%, preferably 0.2-0.5%; the catalyst is one or more of hydrochloric acid, p-toluenesulfonic acid, xylenesulfonic acid and isopropylbenzenesulfonic acid, and the mass fraction is generally 0.1-1%, preferably 0.2-0.5%.
The water is simulated brine with the mineralization degree of 250000mg/L, wherein Ca 2+ 11273Mg/L, mg 2+ 1519mg/L.
The polyvinyl alcohol particles for foam stabilization have no hydrolysis problem at high temperature, and the stability is not influenced by calcium and magnesium ions; in a high-temperature high-salt medium, hydrogen bonds formed by hydroxyl groups and water molecules in polyvinyl alcohol molecules are partially destroyed, so that the hydrophilicity of polyvinyl alcohol particles is reduced, and the adsorption of the polyvinyl alcohol particles on a gas-liquid interface is more favorable for stabilizing the foam. The polyvinyl alcohol particles can be adsorbed in the foam liquid film through the interaction between the hydroxyl groups on the surfaces of the polyvinyl alcohol particles and the surfactant, on one hand, liquid drainage of the liquid film can be delayed through the interaction and the space obstruction of the polyvinyl alcohol particles, and the liquid film stabilizing time is prolonged; on the other hand, it can increase the mechanical strength of the liquid film. Since it needs to be stably present on the liquid film to function, a proper particle size is required. The particle size is too small, so that the liquid film can easily move along with liquid discharge, and the bubble stabilizing capability is affected; the excessive particle size can cause certain pressure on the liquid film, and after the strength of the liquid film is insufficient or the liquid is discharged to a certain degree, the liquid film is crushed, thereby playing a role in reverse. As a result, it was found that the foam stabilizing effect of particles of 500nm to 10. Mu.m was best.
The foaming agent used in the invention is compounded by both short carbon chain hydroxysulfobetaine and long carbon chain hydroxysulfobetaine, and compared with anionic surfactants such as alpha-olefin sulfonate, alkyl diphenyl disulfonate, carboxymethyl polyoxyethylene alkylphenol (or alcohol) ether and the like, the alkyl hydroxysulfobetaine has better temperature resistance and salt resistance, and in addition, the foam liquid film has higher strength by adopting long/short carbon chain compounding, and the macro appearance is more stable.
The foaming agent with low adsorption quantity on the surface of the stratum has better propagation performance. The surface of clastic rock has electronegativity, and compared with tertiary amine oxide surfactant and alkyl betaine surfactant which also have better temperature resistance and salt resistance, the alkyl hydroxysulfobetaine has low adsorption quantity on the surface of the clastic rock, so the spreading performance is good.
The gel dispersion adopted by the invention is formed by crosslinking polyvinyl alcohol. Compared with the polyacrylamide phenolic jelly, the polyvinyl alcohol has the following advantages: (1) the crosslinking reaction can be carried out at room temperature, and the preparation is simpler; (2) the polyvinyl alcohol gel particles have no hydrolysis problem at high temperature, and the stability is not influenced by calcium and magnesium ions; (3) in a high-temperature high-salt medium, hydrogen bonds formed by hydroxyl groups and water molecules in polyvinyl alcohol molecules are partially destroyed, so that the hydrophilicity of polyvinyl alcohol particles is reduced, and the adsorption of the polyvinyl alcohol particles on a gas-liquid interface is more favorable for stabilizing the foam.
The results of the embodiment of the invention show that the foam system has excellent foam performance under the conditions of 150 ℃ and 250000mg/L of salt content, the foaming volume is more than 402mL, the foam half-life period is more than 5.15h, the liquid separation half-life period is more than 5.05min, and the core displacement results show that the resistance factor of the foam is more than 176, so that the foam system has good channeling blocking regulation effect under the conditions of 150 ℃ and 250000mg/L of salt content, effectively delays gas channeling, improves gas flooding recovery ratio, and solves the problem that a high-temperature high-salt clastic rock oil reservoir lacks a foam system for gas channeling regulation.
Table 1 summary of the ratios of the components and the performance parameters of the foam systems of examples 1 to 8
Remarks: in the test for measuring the foam resistance factor, the test conditions are the same: the temperature is 150 ℃, the back pressure is 3MPa, the gas-liquid ratio is 9:1, and the liquid injection speed is 0.5mL/min. The compositions in Table 1 are all in parts by weight.
Table 2 comparison of performance parameters for example 1 and comparative examples 1-3
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. A foam system for clastic rock oil reservoirs, which is characterized by comprising 0.4-0.8wt% of foaming agent, 0.2-1.0wt% of foam stabilizer and the balance of water;
the foaming agent is prepared by compounding short-carbon-chain hydroxysulfobetaine and long-carbon-chain hydroxysulfobetaine;
the foam stabilizer is cross-linked polyvinyl alcohol particles.
2. A foam system for clastic oil reservoirs according to claim 1, wherein the short carbon chain hydroxysulfobetaine has a foaming rate of not less than 400% and the long carbon chain hydroxysulfobetaine has a foaming rate of less than 400%.
3. A foam system for clastic rock reservoirs according to claim 1, wherein the short carbon chain hydroxysulfobetaine has a chain length of 8 to 16 and the long carbon chain hydroxysulfobetaine has a chain length of 18 to 24.
4. A foam system for clastic oil reservoirs according to claim 1, wherein the mass ratio of the short carbon chain hydroxysulfobetaine to the long carbon chain hydroxysulfobetaine is 1.5:1 to 1:1.5.
5. A foam system for clastic oil reservoirs according to claim 1, wherein the cross-linked polymer particles have a particle size of 500nm to 10 μm.
6. The foam system for clastic rock oil reservoirs according to claim 1, wherein the cross-linked polyvinyl alcohol particles are prepared from 3-10wt% of polyvinyl alcohol, 0.1-1wt% of aldehyde substances and 0.1-1wt% of catalyst.
7. The foam system for clastic rock reservoirs of claim 6, wherein the aldehyde species is at least one of formaldehyde, glyoxal, glutaraldehyde, terephthalaldehyde, phthalaldehyde.
8. The foam system for clastic rock reservoirs of claim 6, wherein the catalyst is at least one of hydrochloric acid, p-toluene sulfonic acid, xylene sulfonic acid, cumene sulfonic acid.
9. The foam system for clastic oil reservoirs of claim 1, wherein the foam system phase has a foaming volume of greater than 402mL, a foam half-life of greater than 5.15h, a liquid separation half-life of greater than 5.05min and a foam drag factor of greater than 176 at 150 ℃ and a salt content of 250000 mg/L.
10. A method for preparing a foam system for clastic oil reservoirs, which is characterized by comprising the following steps:
s1: mixing short-carbon-chain hydroxysulfobetaine with long-carbon-chain hydroxysulfobetaine, and heating in a water bath to obtain a foaming agent;
s2: adding formaldehyde into an aqueous solution of polyvinyl alcohol, uniformly stirring, adding a catalyst, stirring, standing to obtain polyvinyl alcohol gel, adding water into the polyvinyl alcohol gel, and crushing to obtain crosslinked polyvinyl alcohol particles;
s3: and mixing the foaming agent, the cross-linked polyvinyl alcohol particles and water to obtain the foam system.
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| CN104974728A (en) * | 2014-11-28 | 2015-10-14 | 涟水新源生物科技有限公司 | Oil-water ultralow-interface-tension alkaline-free oil-displacing agent, alkaline-free chemical composite oil-displacing agent and application thereof in tertiary oil recovery |
| CN107880865A (en) * | 2017-11-01 | 2018-04-06 | 中国石油天然气股份有限公司 | A kind of low interfacial tension foam flooding finish and preparation method thereof |
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| CN104974728A (en) * | 2014-11-28 | 2015-10-14 | 涟水新源生物科技有限公司 | Oil-water ultralow-interface-tension alkaline-free oil-displacing agent, alkaline-free chemical composite oil-displacing agent and application thereof in tertiary oil recovery |
| CN107880865A (en) * | 2017-11-01 | 2018-04-06 | 中国石油天然气股份有限公司 | A kind of low interfacial tension foam flooding finish and preparation method thereof |
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