CN114410285B - Oil displacement agent containing viscoelastic surfactant and recycling method of oil field produced liquid - Google Patents
Oil displacement agent containing viscoelastic surfactant and recycling method of oil field produced liquid Download PDFInfo
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- CN114410285B CN114410285B CN202210032388.8A CN202210032388A CN114410285B CN 114410285 B CN114410285 B CN 114410285B CN 202210032388 A CN202210032388 A CN 202210032388A CN 114410285 B CN114410285 B CN 114410285B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 118
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004064 recycling Methods 0.000 title claims abstract description 16
- 239000004094 surface-active agent Substances 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 title description 21
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 176
- 239000002280 amphoteric surfactant Substances 0.000 claims abstract description 73
- 239000012530 fluid Substances 0.000 claims abstract description 71
- 239000004480 active ingredient Substances 0.000 claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 16
- 238000001556 precipitation Methods 0.000 claims abstract description 16
- 239000003623 enhancer Substances 0.000 claims abstract description 3
- -1 cetyl hydroxypropyl sulfobetaine Chemical compound 0.000 claims description 53
- 229940117986 sulfobetaine Drugs 0.000 claims description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000004115 Sodium Silicate Substances 0.000 claims description 32
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 32
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 32
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 26
- 239000012744 reinforcing agent Substances 0.000 claims description 23
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 21
- MRUAUOIMASANKQ-UHFFFAOYSA-O carboxymethyl-[3-(dodecanoylamino)propyl]-dimethylazanium Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(O)=O MRUAUOIMASANKQ-UHFFFAOYSA-O 0.000 claims description 21
- 229940075468 lauramidopropyl betaine Drugs 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 16
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 15
- 239000000661 sodium alginate Substances 0.000 claims description 15
- 235000010413 sodium alginate Nutrition 0.000 claims description 15
- 229940005550 sodium alginate Drugs 0.000 claims description 15
- 125000000129 anionic group Chemical group 0.000 claims description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 12
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003129 oil well Substances 0.000 claims description 3
- LOGBRYZYTBQBTB-UHFFFAOYSA-N butane-1,2,4-tricarboxylic acid Chemical compound OC(=O)CCC(C(O)=O)CC(O)=O LOGBRYZYTBQBTB-UHFFFAOYSA-N 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 16
- 229920000642 polymer Polymers 0.000 abstract description 13
- 230000008859 change Effects 0.000 abstract description 9
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 116
- 239000000243 solution Substances 0.000 description 95
- 238000012360 testing method Methods 0.000 description 45
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 239000013067 intermediate product Substances 0.000 description 15
- 239000002563 ionic surfactant Substances 0.000 description 15
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 description 14
- 239000000178 monomer Substances 0.000 description 12
- 239000004964 aerogel Substances 0.000 description 11
- 238000009472 formulation Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 9
- 230000002195 synergetic effect Effects 0.000 description 9
- 238000013329 compounding Methods 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000002209 hydrophobic effect Effects 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000012071 phase Substances 0.000 description 7
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 125000000913 palmityl 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])[H] 0.000 description 6
- 125000004079 stearyl 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])[H] 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 229910017053 inorganic salt Inorganic materials 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002516 radical scavenger Substances 0.000 description 4
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004280 Sodium formate Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 2
- 229940071106 ethylenediaminetetraacetate Drugs 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 2
- 235000019254 sodium formate Nutrition 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229920002307 Dextran Polymers 0.000 description 1
- 239000003109 Disodium ethylene diamine tetraacetate 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
- 229920001046 Nanocellulose Polymers 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 241001092483 Prinsepia Species 0.000 description 1
- 235000008997 Prinsepia uniflora Nutrition 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 235000011054 acetic acid Nutrition 0.000 description 1
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- RESSOZOGQXKCKT-UHFFFAOYSA-N ethene;propane-1,2-diol Chemical compound C=C.CC(O)CO RESSOZOGQXKCKT-UHFFFAOYSA-N 0.000 description 1
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 239000002265 redox agent Substances 0.000 description 1
- 239000012966 redox initiator Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000004381 surface treatment Methods 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
- C09K8/584—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
-
- 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
- C09K8/588—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 polymers
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/30—Viscoelastic surfactants [VES]
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Lubricants (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
An oil displacement agent containing a viscoelastic surfactant and a method for recycling oilfield produced fluid, the oil displacement agent comprising: a polyacrylamide solution recovered from an oilfield produced fluid containing polyacrylamide, a viscoelastic amphoteric surfactant having a concentration of 2500mg/L to 5000mg/L by mass of an active ingredient, a salt enhancer having a concentration of 500mg/L to 2000mg/L, and a precipitation inhibitor having a concentration of 30mg/L to 50mg/L, and the concentration of polyacrylamide is 300mg/L or more in the oil displacement agent. The oil displacement agent and the recycling method of the oilfield produced fluid realize the recycling of the polyacrylamide solution in the oilfield polymer-containing produced fluid, can change waste into valuable, and play a role in economically and environmentally-friendly improving the recovery ratio of the oilfield.
Description
Technical Field
The application relates to the technical field of oil displacement in oil fields, in particular to an oil displacement agent containing a viscoelastic surfactant and a recycling method of oil field produced liquid.
Background
Long-term injection of oil fields results in the production of polymer-containing produced fluids, which are mixtures of polymers, water, oils, and the like. Only the produced water phase is reused, and the treated water phase can be used as reinjection water, but is not used as an oil displacement agent for reuse. The polymer injection quantity of the continuous injection block is larger every year, and the period is long. If the produced polymer solution is reused, the effects of effectively increasing the viscosity of the water phase and improving the recovery ratio are achieved, and the effects of changing waste into valuable and displacing oil with low cost and high efficiency are achieved.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the application.
The application provides an oil displacement agent containing a viscoelastic surfactant and a method for recycling oilfield produced fluid, which realize the recycling of polyacrylamide solution in oilfield polymer-containing produced fluid, change waste into valuable, and play a role in economically and environmentally-friendly improving the recovery ratio of the oilfield.
The application provides an oil displacement agent containing a viscoelastic surfactant, which comprises the following components: a polyacrylamide solution recovered from an oilfield produced fluid containing polyacrylamide, a viscoelastic amphoteric surfactant having a concentration of 2500mg/L to 5000 mg/L by mass of an active ingredient, a salt enhancer having a concentration of 500mg/L to 2000mg/L, and a precipitation inhibitor having a concentration of 30mg/L to 50mg/L, and the concentration of polyacrylamide is 300mg/L or more in the oil displacement agent.
In the embodiment of the present application, the polyacrylamide may be an anionic polyacrylamide.
In the embodiment of the application, the polyacrylamide may be a hydrophobically associating anionic polyacrylamide.
In the embodiment of the application, the concentration of the polyacrylamide in the oil displacement agent can be 300mg/L to 800mg/L.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may be selected from any one or more of betaine-type viscoelastic amphoteric surfactants, and include at least one alkyl betaine-type viscoelastic amphoteric surfactant having a carbon chain length of 12 to 22.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may include any one or both of cetyl hydroxypropyl sulfobetaine and stearyl hydroxypropyl sulfobetaine.
In embodiments of the present application, the viscoelastic amphoteric surfactant may be a mixture of erucamide propyl hydroxysulfobetaine, cetyl hydroxypropyl sulfobetaine, stearyl hydroxypropyl sulfobetaine, and lauramidopropyl betaine.
In the embodiment of the application, in the oil displacement agent, the concentration of the erucamide propyl hydroxysulfobetaine can be 1000mg/L to 2000mg/L, the concentration of the hexadecyl hydroxypropyl sulfobetaine can be 500mg/L to 1000mg/L, the concentration of the octadecyl hydroxypropyl sulfobetaine can be 500mg/L to 1000mg/L, and the concentration of the lauramidopropyl betaine can be 500mg/L to 1000mg/L, based on the mass of the active ingredient.
In the embodiment of the application, the salt reinforcing agent can be selected from any one or more of sodium silicate, sodium alginate and sodium carbonate.
In an embodiment of the present application, the precipitation inhibitor may be selected from any one or more of butane-2-phosphonate-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic acid.
The application also provides a recycling method of the oilfield produced fluid, which comprises the following steps: oil-water separation is carried out on the oil field produced fluid containing polyacrylamide, and polyacrylamide solution is recovered; mixing the recovered polyacrylamide solution with a viscoelastic amphoteric surfactant, a salt reinforcing agent and a precipitation inhibitor to obtain an oil displacement agent; and injecting the oil displacement agent into an oil well to displace oil.
In the embodiment of the application, in the oil displacement agent, the concentration of polyacrylamide can be above 300mg/L, the concentration of the viscoelastic ampholytic surfactant calculated by active ingredients can be 2500mg/L to 5000mg/L, the concentration of the salt reinforcing agent can be 500mg/L to 2000mg/L, and the concentration of the precipitation inhibitor can be 30mg/L to 50mg/L.
In the embodiment of the present application, the polyacrylamide may be an anionic polyacrylamide.
In the embodiment of the application, the polyacrylamide may be a hydrophobically associating anionic polyacrylamide.
In the embodiment of the application, the concentration of the polyacrylamide in the oil displacement agent can be 300mg/L to 800mg/L.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may be selected from any one or more of betaine-type viscoelastic amphoteric surfactants, and include at least one alkyl betaine-type viscoelastic amphoteric surfactant having a carbon chain length of 12 to 22.
In the embodiment of the application, the viscoelastic amphoteric surfactant may be erucamide propyl hydroxysultaine, cetyl hydroxypropyl sulfobetaine, a mixture of stearyl hydroxypropyl sulfobetaine and lauramidopropyl betaine, and in the oil displacement agent, the concentration of the erucamide propyl hydroxysultaine may be 1000mg/L to 2000mg/L, the concentration of the cetyl hydroxypropyl sulfobetaine may be 500mg/L to 1000mg/L, the concentration of the stearyl hydroxypropyl sulfobetaine may be 500mg/L to 1000mg/L, and the concentration of the lauramidopropyl betaine may be 500mg/L to 1000mg/L, based on the mass of the active ingredient.
In the embodiment of the application, the salt reinforcing agent can be selected from any one or more of sodium silicate, sodium alginate and sodium carbonate.
In an embodiment of the present application, the precipitation inhibitor may be selected from any one or more of butane-2-phosphonate-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic acid.
According to the oil displacement agent containing the viscoelastic surfactant and the recycling method of the oilfield produced fluid, the polyacrylamide solution recovered from the oilfield produced fluid, the viscoelastic amphoteric surfactant and the salt reinforcing agent are compounded to obtain a synergistic effect, so that the viscosity of a compound system is obviously improved to 12 mPas, the compound system can be directly used as the oil displacement agent for displacement of oil, the recycling of the polyacrylamide solution in the oilfield produced fluid is realized, waste materials can be changed into things of value, and the effect of economically and environmentally improving the recovery ratio of an oilfield is achieved; and the use concentration of the viscoelastic ampholytic surfactant is low, so that the cost of the oil displacement agent is reduced.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. Other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the principles of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the principles of the application.
FIG. 1 is a process flow diagram of the recovery of a polyacrylamide solution from an oilfield produced fluid in accordance with an exemplary embodiment of the present application;
FIG. 2 is a viscosity test result of the polyacrylamide solution of comparative example 1 of the present application;
FIG. 3 is a graph showing the results of viscosity testing of the oil-displacing agent of example 1 of the present application;
FIG. 4 is a graph showing the change of the stability kinetic index TSI of the oil-displacing agent with time measured in test example 1 according to the present application;
FIG. 5 is a plot of recovery ratio change for test example 2-1 of the present application;
FIG. 6 is a plot of recovery ratio change for test example 2-2 of the present application;
FIG. 7 is a schematic diagram of the structure of an experimental apparatus used in the capillary displacement experiment of test example 3 according to the present application;
FIG. 8 is a graph of displacement rate versus external pressure for a polyacrylamide solution at a concentration of 300ppm versus decane;
FIG. 9 is a graph showing the displacement velocity versus external pressure of the displacement agent versus decane in the example of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
In the present application, "oil field produced liquid" means an oil field produced liquid containing polyacrylamide.
In the present application, the concentrations of the components are all concentrations calculated on the basis of the mass of the active ingredient.
The embodiment of the application provides an oil displacement agent containing a viscoelastic surfactant, which comprises the following components: a polyacrylamide solution recovered from an oilfield produced fluid containing polyacrylamide, a viscoelastic amphoteric surfactant having a concentration of 2500mg/L to 5000mg/L by mass of an active ingredient, a salt-type reinforcing agent having a concentration of 500mg/L to 2000mg/L, and a precipitation inhibitor having a concentration of 30mg/L to 50mg/L, and the concentration of polyacrylamide in the oil displacement agent is 300 mg/L or more.
According to the oil displacement agent containing the viscoelastic surfactant and the recycling method of the oilfield produced fluid, the polyacrylamide solution recovered from the oilfield produced fluid, the viscoelastic amphoteric surfactant and the salt reinforcing agent are compounded to obtain a synergistic effect, so that the viscosity of a compound system is obviously improved to 12 mPas, the compound system can be directly used as the oil displacement agent for displacement of oil, the recycling of the polyacrylamide solution in the oilfield produced fluid is realized, waste materials can be changed into things of value, and the effect of economically and environmentally improving the recovery ratio of an oilfield is achieved; and the use concentration of the viscoelastic ampholytic surfactant is low, so that the cost of the oil displacement agent is reduced.
In the embodiment of the present application, the polyacrylamide may be an anionic polyacrylamide.
The anionic polyacrylamide can be prepared from Acrylamide (AM) monomer, redox agent, sodium hydroxide, sodium formate, functional monomer AMPS, N-vinyl-2-pyrrolidone, azodiisoheptonitrile and anhydrous sodium carbonate, and can be purchased from Daqing refining company, dongying market polymerization chemical industry Limited liability company, henan Zhengjia energy environmental protection Co Ltd, daqing Australian petrochemical Co Ltd and the like.
It can also be prepared according to the following method: 1) Adding a refined acrylamide monomer AM, a functional monomer AMPS and N-vinyl-2-pyrrolidone into a wide-mouth bottle, preparing a monomer solution by taking distilled water as a solvent, and regulating the pH value of the solution to 7-8 by sodium formate and anhydrous sodium carbonate; 2) Adding an oxidation-reduction agent and an azo compound initiation system at a certain temperature to initiate reaction to obtain colloid; the composite initiation system comprises a redox initiation system composed of oxidant tert-butyl hydroperoxide and reducer ferrous ammonium sulfate and an azo initiation system composed of azo-diisoheptonitrile; 3) Granulating, and adding sodium hydroxide to perform alkaline hydrolysis reaction; 4) And crushing, drying and sieving the colloid subjected to the sodium hydroxide hydrolysis reaction to obtain a finished product.
In the embodiment of the application, the polyacrylamide may be a hydrophobically associating anionic polyacrylamide.
The hydrophobic association type anionic polyacrylamide can be selected from Acrylamide (AM) monomer, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) monomer, ammonium persulfate, sodium bisulphite (industrial grade), sodium Dodecyl Sulfate (SDS), disodium ethylenediamine tetraacetate (EDTA), sodium hydroxide (analytically pure) and hydrophobic monomer N-phenethyl-N-dodecyl methacrylamide (PEMAM), can be purchased from Sichuan optical sub-polymer chemical industry Co., ltd, shandong Dong polymer Co., victory oilfield victory chemical industry Co., ltd, etc.
It can also be prepared according to the following method: preparing AM monomer into solution by deionized water, adding a certain amount of AMPS (ethylene propylene glycol) in a mass fraction of 25%, adding sodium hydroxide for neutralization after the AM monomer is dissolved, regulating the pH value of the solution to 7-8 by using a pH regulator (comprising sodium carbonate, sodium bicarbonate, acetic acid, oxalic acid, lactic acid and the like), adding hydrophobic monomers PEDMAM, SDS and EDTA, controlling the temperature of the solution to 15 ℃ after the AM monomer is fully dissolved, introducing high-purity argon to deoxidize for 30min, adding an initiator ammonium persulfate-sodium bisulfite (mass ratio of 2:1) accounting for 0.05% of the total mass of the monomers, inserting a thermometer to record the reaction temperature, sealing a reaction container for 3h, taking out colloid, shearing and granulating, adding sodium hydroxide for hydrolysis for 2h at 95 ℃ and the theoretical value of hydrolysis degree of 20%. Taking out the hydrolyzed colloidal particles, drying at 95 ℃ for 1h, crushing and sieving to obtain a white powdery polymer sample.
In the embodiment of the application, the concentration of the polyacrylamide in the oil displacement agent can be 300mg/L to 800mg/L.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may be selected from any one or more of betaine-type viscoelastic amphoteric surfactants, and include at least one alkyl betaine-type viscoelastic amphoteric surfactant having a carbon chain length of 12 to 22.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may include any one or both of cetyl hydroxypropyl sulfobetaine and stearyl hydroxypropyl sulfobetaine.
In embodiments of the present application, the viscoelastic amphoteric surfactant may be a mixture of erucamide propyl hydroxysulfobetaine, cetyl hydroxypropyl sulfobetaine, stearyl hydroxypropyl sulfobetaine, and lauramidopropyl betaine.
In the embodiment of the application, in the oil displacement agent, the concentration of the erucamide propyl hydroxysulfobetaine can be 1000mg/L to 2000mg/L, the concentration of the hexadecyl hydroxypropyl sulfobetaine can be 500mg/L to 1000mg/L, the concentration of the octadecyl hydroxypropyl sulfobetaine can be 500mg/L to 1000mg/L, and the concentration of the lauramidopropyl betaine can be 500mg/L to 1000mg/L, based on the mass of the active ingredient.
In the embodiment of the application, the salt reinforcing agent can be selected from any one or more of sodium silicate, sodium alginate and sodium carbonate.
In an embodiment of the present application, the sodium silicate may be sodium silicate particles or liquid sodium silicate.
If there is an on-line injection requirement, liquid sodium silicate is better. Because, compared with sodium silicate particles, the liquid sodium silicate also has the effect of obviously enhancing the viscoelasticity of the system, and has the characteristics of being capable of being injected in-line, simple and effective and having lower risk. The method not only solves the problem of insufficient space of the platform, but also greatly simplifies the construction process, and has great application potential and popularization space.
In the embodiment of the application, the modulus of the liquid sodium silicate can be 1.5 to 3.5, the mass fraction of the active ingredient can be 26.0 to 29 percent, and the industrial product can be purchased from Tianjin Hui Prinsepia sodium Limited company, jinan Rong chemical industry Limited company, jinan Yeqing biotechnology Limited company and the like.
In an embodiment of the present application, the precipitation inhibitor may be selected from any one or more of butane-2-phosphonate-1, 2, 4-tricarboxylic acid (PBTCA), hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic Acid (ATMP).
In an embodiment of the present application, the precipitation inhibitor may be selected from any one or more of butane-2-phosphonate-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic acid.
In the embodiment of the application, oil-water separation can be carried out on the oilfield produced fluid, so that the water phase (containing polyacrylamide and water) and the oil phase in the oilfield produced fluid are separated, and the polyacrylamide solution is recovered.
In the embodiment of the application, a physical method and a chemical method can be adopted to separate oil from water in the oilfield produced fluid.
FIG. 1 is a process flow diagram of the recovery of a polyacrylamide solution from an oilfield produced fluid in accordance with an exemplary embodiment of the present application. As shown in fig. 1, the process of recovering a polyacrylamide solution from an oilfield produced fluid may include:
step 1: demulsifying the oilfield produced fluid to form a first intermediate product;
step 2: filtering the first intermediate product, collecting the supernatant, forming a second intermediate product if the suspended matter in the supernatant is not greater than the first standard, and repeating the filtering if the suspended matter is greater than the first standard;
step 3: adding an extractant into the second intermediate product, and performing multiple times of extraction to form a third intermediate product;
if the oil content in the third intermediate product is not greater than the second standard, recovering the third intermediate product to obtain a polyacrylamide solution, detecting the absorbance value of the third intermediate product, and carrying out step 4 if the oil content in the third intermediate product is greater than the second standard according to the polymer concentration in the oil field output liquid of the absorbance value;
Step 4: adding a water scavenger into the third intermediate product, purifying, and collecting the supernatant to form a fourth intermediate product;
and if the oil content in the fourth intermediate product is not more than the second standard, recovering the fourth intermediate product to obtain a polyacrylamide solution, detecting the absorbance value of the fourth intermediate product, obtaining the polymer concentration in the oil field output liquid according to the absorbance value, and if the oil content in the fourth intermediate product is more than the second standard, repeating the step 4.
The first criterion may be selected to be 30mg/L; the second criterion may be selected to be 30mg/L.
In the step 1, an ultrasonic separation device can be adopted to carry out demulsification, and the purpose is mainly to separate free oil and dispersed oil; the ultrasonic separation device can adopt an XY-1000D constant temperature closed ultrasonic reactor, and the working frequency is as follows: 22+/-1 KHz; ultrasonic power: 50-1000W. The demulsification can also be carried out by adopting a heating auxiliary oscillation device; the heating auxiliary oscillation device can heat the oilfield produced fluid, can apply periodic vibration to the oilfield produced fluid, and has a good demulsification effect.
In step 2, a hydrophobic stainless steel mesh may be used for oil-water separation and/or an aerogel filter element may be used for filtration in order to separate the emulsified oil.
Polytetrafluoroethylene spray modified hydrophobic stainless steel mesh can be used for oil-water separation. In addition, one or more of polyvinylidene fluoride, polyimide, polyacrylonitrile, polytetrafluoroethylene and polytrifluoroethylene can be selected for spraying modified hydrophobic stainless steel mesh for oil-water separation.
The aerogel filter element can adopt composite aerogel. The composite aerogel has good hydrophobicity without any surface treatment, and can effectively adsorb oil and organic solvent in water due to the hydrophobicity and the porous structure, and the adsorption amount is up to 55.85-135.29g/g.
The aerogel is required to be a hydrophobically modified aerogel, for example, any of a hydrophobic cellulose/dextran composite aerogel, a graphene aerogel, a lignin/cellulose aerogel, a silanized modified nanocellulose-based aerogel, and the above type of aerogel has high adsorptivity to oil and organic solvents in water.
In the step 3, the extractant can adopt S-316, petroleum ether, diesel oil or n-hexane.
In the step 4, polyether type water scavenger can be adopted as the water scavenger. The first push is petroleum ether, normal hexane and diesel oil, which are commonly used extraction medicaments determined to not generate any interference. If the oil content in the extracted water can not reach the standard, S-316 and the block polyether type water scavenger are used.
In the embodiment of the application, the oil phase content in the polyacrylamide solution recovered from the oilfield produced fluid can be not more than 30mg/L, and the median value of the particle size of the suspended matters can be not more than 10 mu m.
The embodiment of the application also provides a recycling method of the oilfield produced fluid, in particular to a recycling method of the polyacrylamide solution recovered from the oilfield produced fluid, which comprises the following steps: oil-water separation is carried out on the oil field produced fluid containing polyacrylamide, and polyacrylamide solution is recovered; mixing the recovered polyacrylamide solution with a viscoelastic amphoteric surfactant, a salt reinforcing agent and a precipitation inhibitor to obtain an oil displacement agent; and injecting the oil displacement agent into an oil well to displace oil.
In the embodiment of the application, in the oil displacement agent, the concentration of polyacrylamide can be above 300mg/L, the concentration of the viscoelastic ampholytic surfactant calculated by active ingredients can be 2500mg/L to 5000mg/L, the concentration of the salt reinforcing agent can be 500mg/L to 2000mg/L, and the concentration of the precipitation inhibitor can be 30mg/L to 50mg/L.
In the embodiment of the present application, the polyacrylamide may be an anionic polyacrylamide.
In the embodiment of the application, the polyacrylamide may be a hydrophobically associating anionic polyacrylamide.
In the embodiment of the application, the concentration of the polyacrylamide in the oil displacement agent can be 300mg/L to 800mg/L.
In an embodiment of the present application, the viscoelastic amphoteric surfactant may be selected from any one or more of betaine-type viscoelastic amphoteric surfactants, and include at least one alkyl betaine-type viscoelastic amphoteric surfactant having a carbon chain length of 12 to 22.
In the embodiment of the application, the viscoelastic amphoteric surfactant may be erucamide propyl hydroxysultaine, cetyl hydroxypropyl sulfobetaine, a mixture of stearyl hydroxypropyl sulfobetaine and lauramidopropyl betaine, and in the oil displacement agent, the concentration of the erucamide propyl hydroxysultaine may be 1000mg/L to 2000mg/L, the concentration of the cetyl hydroxypropyl sulfobetaine may be 500mg/L to 1000mg/L, the concentration of the stearyl hydroxypropyl sulfobetaine may be 500mg/L to 1000mg/L, and the concentration of the lauramidopropyl betaine may be 500mg/L to 1000mg/L, based on the mass of the active ingredient.
In the embodiment of the application, the salt reinforcing agent can be selected from any one or more of sodium silicate, sodium alginate and sodium carbonate.
In an embodiment of the present application, the precipitation inhibitor may be selected from any one or more of butane-2-phosphonate-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, and aminotrimethylene phosphonic acid.
Polyacrylamide 1 in the polyacrylamide 1 solution recovered from oilfield produced fluid in the following examples and comparative examples is hydrophobic association type anionic polyacrylamide, which is purchased from Sichuan photopolymerized chemical Co., ltd, and is model number AP-P4, and is recovered from Bohai sea B oilfield; the polyacrylamide 2 in the polyacrylamide 2 solution recovered from the oilfield produced fluid is conventional anionic polyacrylamide, and is purchased from the company of the polymerization chemical industry Co.Ltd in the eastern ying city, the model is type II polyacrylamide for oil displacement, and the polyacrylamide is recovered from the Bohai sea H oilfield.
The information of the injected water contained in the obtained polyacrylamide solution is shown in table 1.
TABLE 1
Comparative example 1
Viscosity of polyacrylamide solutions recovered from oilfield produced fluids alone
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And simulated reservoir temperature (65 ℃ C.)
The viscosity of the polyacrylamide solution was tested under the conditions. The test results are shown in table 2 and fig. 2.
TABLE 2
| Polyacrylamide 1 concentration (mg/L) | 113 | 206 | 321 | 512 | 802 |
| Viscosity (mPa. S) | 1.9 | 3.1 | 4.3 | 6.4 | 8.1 |
| Polyacrylamide 2 concentration (mg/L) | 108 | 211 | 318 | 509 | 789 |
| Viscosity (mPa. S) | 2.1 | 3.2 | 4.2 | 4.9 | 5.8 |
It can be seen that the two polyacrylamide solutions recovered from the oilfield produced fluid are each of lower viscosity; the viscosity of the oil displacement system in offshore oil fields is required to reach more than 12 mPas under the simulated oil field temperature. Thus, polyacrylamide solutions recovered from oilfield produced fluids may not be directly used as an oil displacement agent.
Comparative example 2
Viscosity of viscoelastic ampholytic surfactant alone in low concentration
The raw material information of the viscoelastic amphoteric surfactant is shown in table 3.
TABLE 3 Table 3
| Raw material name | Mass fraction of active ingredient | Purchasing manufacturer |
| Erucamide propyl hydroxysulfobetaine | 45 to 50% | The praise practice of Shanghai hasLimited company |
| Cetyl hydroxypropyl sulfobetaine | 35％ | Shanghai praise Utility Co Ltd |
| Octadecyl hydroxypropyl sulfobetaine | 35％ | Shanghai praise Utility Co Ltd |
| Lauramidopropyl betaine | 35％ | Shanghai praise Utility Co Ltd |
Formulation of viscoelastic amphoteric surfactant: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500 mg/L+injection water, based on the mass of the active ingredient.
Using a An Dongpa MCR 302 rheometer at 7.34s -1 And simulated reservoir temperature (65 ℃) conditions. Test results: the viscosity was 3.6 mPas.
It can be seen that the viscosity of the viscoelastic amphoteric surfactant alone is low, well below 12 mPa-s.
Comparative example 3
Viscosity of system compounded by polyacrylamide solution recovered from oilfield produced fluid and salt reinforcing agent
The formula of the compound system 1 and 2: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + sodium alginate at a concentration of 1000mg/L + HEDP (hydroxyethylidene bisphosphonic acid) at a concentration of 40mg/L, the concentration of polyacrylamide being shown in table 4; here, the concentration of polyacrylamide, the concentration of sodium alginate, and the concentration of HEDP refer to the concentration thereof in the compound system.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 4.
TABLE 4 Table 4
| Polyacrylamide 1 concentration (mg/L) | 112 | 205 | 318 | 515 | 788 |
| Viscosity of the Complex System 1 (mPa. S) | 3.5 | 4.6 | 7.5 | 8.4 | 9.8 |
| Polyacrylamide 2 concentration (mg/L) | 107 | 211 | 309 | 510 | 818 |
| CompoundingViscosity of System 2 (mPa. S) | 3.7 | 6.4 | 7.9 | 8.9 | 9.4 |
It can be seen that the viscosity of the compound system formed by the polyacrylamide solution recovered from the oilfield produced fluid and the salt reinforcing agent is low and is far less than 12 mPa.s.
Example 1
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid and viscoelastic amphoteric surfactant
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution + viscoelastic amphoteric surfactant recovered from oilfield produced fluid, the concentration of polyacrylamide is shown in table 5; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500mg/L, based on the mass of the active ingredient; the concentration of polyacrylamide and the concentration of viscoelastic amphoteric surfactant herein refer to their concentration in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in table 5 and fig. 3.
TABLE 5
| Polyacrylamide 1 concentration (mg/L) | 112 | 205 | 318 | 515 | 788 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 5.8 | 6.9 | 8.1 | 10.5 | 11.9 |
| Polyacrylamide 2 concentration (mg/L) | 107 | 211 | 309 | 510 | 818 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 6.1 | 7.2 | 8.3 | 9.1 | 10.6 |
It can be seen that in this example, the viscosity is significantly improved after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant, compared with the polyacrylamide solution and the viscoelastic amphoteric surfactant of comparative examples 1 and 2, which means that the polyacrylamide solution recovered from the oilfield produced fluid and the viscoelastic amphoteric surfactant are compounded to obtain a synergistic effect, and the viscosity of the oil displacement agent 1 is very close to 12mpa·s when the concentration of the polyacrylamide 1 is 788 mg/L.
Example 2
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant and inorganic salt reinforcing agent (sodium silicate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + viscoelastic amphoteric surfactant + sodium silicate at 1000mg/L + PBTCA at 40mg/L, the polyacrylamide concentrations are shown in table 6; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500mg/L, based on the mass of the active ingredient; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium silicate, and the concentration of PBTCA refer to the concentration thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 6.
TABLE 6
| Polyacrylamide 1 concentration (mg/L) | 112 | 207 | 312 | 507 | 789 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 6.2 | 8.2 | 12.5 | 14.6 | 18.2 |
| Polyacrylamide 2 concentration (mg/L) | 105 | 213 | 308 | 524 | 775 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 7.3 | 7.9 | 12.3 | 13.5 | 14.2 |
It can be seen that after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and the sodium silicate, the viscosity is further obviously improved, and when the concentration of the recovered polyacrylamide solution is about 300mg/L, the viscosity of the oil displacement agent can reach 12 mPa.s, so that the oil displacement agent can be directly used for oil displacement; whereas the viscosity of the recovered polyacrylamide solution alone, the viscoelastic amphoteric surfactant alone and the sodium silicate alone are all well below 12 mPa-s. It is explained that the synergistic effect is obtained after compounding the polyacrylamide solution recovered from the oilfield produced fluid with the viscoelastic amphoteric surfactant and sodium silicate.
Example 3
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant and salt reinforcing agent (sodium alginate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant, sodium alginate at 1000mg/L, HEDP at 40mg/L, and polyacrylamide at the concentrations shown in table 7; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500mg/L, based on the mass of the active ingredient; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium alginate, and the concentration of HEDP refer to the concentration thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 7.
TABLE 7
| Polyacrylamide 1 concentration (mg/L) | 111 | 212 | 307 | 521 | 786 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 6.8 | 8.6 | 12.8 | 15.2 | 19.5 |
| Polyacrylamide 2 concentration (mg/L) | 100 | 200 | 300 | 500 | 800 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 6.6 | 8.4 | 13.6 | 15.9 | 17.6 |
It can be seen that after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and the sodium alginate, the viscosity is further obviously improved, and when the concentration of the recovered polyacrylamide solution is about 300mg/L, the viscosity of the oil displacement agent can reach 12 mPa.s, so that the oil displacement agent can be directly used for oil displacement; whereas the viscosity of the recovered polyacrylamide solution alone, the viscoelastic amphoteric surfactant alone and the sodium alginate alone are all well below 12 mPa-s. It shows that the synergistic effect is obtained after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and the sodium alginate.
Example 4
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant and inorganic salt reinforcing agent (sodium carbonate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + viscoelastic amphoteric surfactant + sodium carbonate at a concentration of 1000mg/L + ATMP at a concentration of 30mg/L, the concentration of polyacrylamide being shown in table 7; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500mg/L, based on the mass of the active ingredient; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium carbonate, and the concentration of ATMP refer to the concentrations thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 8.
TABLE 8
| Polyacrylamide 1 concentration (mg/L) | 109 | 211 | 321 | 489 | 811 |
| Viscosity of oil-displacing agent 1 (mPa.s)) | 6.5 | 7.8 | 11.4 | 12.4 | 13.9 |
| Polyacrylamide 2 concentration (mg/L) | 100 | 200 | 300 | 500 | 800 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 6.9 | 7.6 | 11.9 | 13.8 | 14.8 |
It can be seen that after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and sodium carbonate, the viscosity is further obviously improved, and when the concentration of the recovered polyacrylamide solution is about 500mg/L, the viscosity of the oil displacement agent can reach 12 mPa.s, so that the oil displacement agent can be directly used for oil displacement; whereas the viscosity of the recovered polyacrylamide solution alone, the viscoelastic amphoteric surfactant alone and the sodium carbonate alone are all well below 12 mPa-s. It shows that after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and sodium carbonate, a synergistic effect is obtained.
Example 5
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant and inorganic salt reinforcing agent (sodium silicate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + viscoelastic amphoteric surfactant + sodium silicate at 1000mg/L + PBTCA at 40mg/L, the polyacrylamide concentrations are shown in table 6; the formulation of the viscoelastic ampholytic surfactant is the same, and is: based on the mass of the active ingredients, the concentration of the erucic acid amide propyl hydroxypropyl sulfobetaine is 2000mg/L, the concentration of the cetyl hydroxypropyl sulfobetaine is 1000mg/L, the concentration of the octadecyl hydroxypropyl sulfobetaine is 1000mg/L, and the concentration of the lauramidopropyl betaine is 1000 mg/L; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium silicate, and the concentration of PBTCA refer to the concentration thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 9.
TABLE 9
| Polyacrylamide 1 concentration (mg/L) | 112 | 207 | 312 | 507 | 789 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 7.3 | 9.3 | 13.4 | 15.3 | 20.2 |
| Polyacrylamide 2 concentration (mg/L) | 105 | 213 | 308 | 524 | 775 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 8.1 | 9.1 | 13.6 | 14.8 | 16.8 |
It can be seen that the polyacrylamide solution recovered from the oilfield produced fluid in the displacement agent of this example still achieved a synergistic effect with the viscoelastic amphoteric surfactant and sodium silicate when the concentration of the viscoelastic amphoteric surfactant was varied. When the concentration of the recovered polyacrylamide solution is about 300mg/L, the viscosity of the oil displacement agent can reach 12 mPa.s, and the oil displacement agent can be directly used for oil displacement.
Example 6
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, viscoelastic amphoteric surfactant and inorganic salt reinforcing agent (sodium silicate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + viscoelastic amphoteric surfactant + sodium silicate at 2000mg/L + PBTCA at 45mg/L, the polyacrylamide concentrations are shown in table 10; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxysulfobetaine with a concentration of 1000 mg/L+hexadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+octadecyl hydroxypropyl sulfobetaine with a concentration of 500 mg/L+lauramidopropyl betaine with a concentration of 500mg/L, based on the mass of the active ingredient; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium silicate, and the concentration of PBTCA refer to the concentration thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And testing the viscosity of the polyacrylamide solution under simulated reservoir temperature (65 ℃) conditions. The test results are shown in Table 10.
Table 10
| Polyacrylamide 1 concentration (mg/L) | 112 | 207 | 312 | 507 | 789 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 7.1 | 8.9 | 12.1 | 14.3 | 15.2 |
| Polyacrylamide 2 concentration (mg/L) | 105 | 213 | 308 | 524 | 775 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 7.8 | 9.2 | 12.6 | 13.7 | 15.8 |
It can be seen that the polyacrylamide solution recovered from the oilfield produced fluid in the displacement agent of this example still achieved a synergistic effect with the viscoelastic amphoteric surfactant and sodium silicate as the concentration of sodium silicate was varied. When the concentration of the recovered polyacrylamide solution is about 300mg/L, the viscosity of the oil displacement agent can reach 12 mPa.s, and the oil displacement agent can be directly used for oil displacement.
Example 7
Viscosity of oil displacement agent obtained by compounding polyacrylamide solution recovered from oilfield produced fluid, amphoteric surfactant and inorganic salt reinforcing agent (sodium silicate)
The formula of the oil displacement agent 1 and 2 comprises: polyacrylamide 1 or 2 solution recovered from oilfield produced fluid + viscoelastic amphoteric surfactant + sodium silicate at 1000mg/L + PBTCA at 40mg/L, the polyacrylamide concentrations are shown in table 11; the formulation of the viscoelastic ampholytic surfactant is the same, and is: erucamide propyl hydroxypropyl sulfobetaine with the concentration of 1200mg/L and hexadecyl hydroxypropyl sulfobetaine with the concentration of 1200mg/L are calculated by the mass of the active ingredients; here, the concentration of the polyacrylamide solution, the concentration of the viscoelastic amphoteric surfactant, the concentration of sodium silicate, and the concentration of PBTCA refer to the concentration thereof in the oil-displacing agent.
Test conditions: using a An Dongpa MCR 302 rheometer at 7.34s -1 And under simulated reservoir temperature (65 ℃) conditions, testingViscosity of the polyacrylamide solution. The test results are shown in Table 11.
TABLE 11
| Polyacrylamide 1 concentration (mg/L) | 108 | 212 | 305 | 514 | 804 |
| Viscosity of oil-displacing agent 1 (mPa. S) | 5.8 | 8.6 | 12.3 | 14.9 | 18.6 |
| Polyacrylamide 2 concentration (mg/L) | 111 | 207 | 314 | 506 | 786 |
| Viscosity of oil-displacing agent 2 (mPa. S) | 6.9 | 8.1 | 12.5 | 13.9 | 15.1 |
It can be seen that after the polyacrylamide solution recovered from the oilfield produced fluid is compounded with the viscoelastic amphoteric surfactant and the sodium silicate, the synergistic effect is obtained, the viscosity is obviously improved, and when the concentration of the recovered polyacrylamide solution is about 300mg/L, the viscosity of the oil displacement agent can reach more than 12 mPa.s, so that the oil displacement agent can be directly used for oil displacement.
Test example 1
Stability test of oil-displacing agent of the embodiment of the application
Because the oil displacement agent needs at least 2 to 3 hours from injection into the stratum, the system is ensured not to be precipitated and layered in the process, namely the injected system has certain stability. We scanned the displacement agent of example 5 of the present application using a multiple light scattering instrument (stability analyzer) TURBISCAN. And scanning the sample from bottom to top at intervals, and obtaining the stability of the test sample through the change of the transmitted light intensity and the back scattering light intensity. The test results are shown in fig. 4.
FIG. 4 is a graph showing the change of the stability kinetic index TSI of the oil-displacing agent with time measured in test example 1 according to the present application.
As can be seen from fig. 4, the TSI value of the oil displacement agent according to the embodiment of the present application is less than 3, and it is considered that the system has good stability in the heating period, and it can be ensured that sedimentation and delamination do not occur during the injection process.
Test example 2
Oil displacement effect test of the oil displacement agent of the embodiment of the application
After the water content reaches 95% by adopting a porous pressure measuring device, the oil displacement agent of the embodiment of the application with the concentration of 0.3PV is injected, the water content reaches 95% by adopting the subsequent water displacement, and the recovery ratio is calculated.
Test example 2-1
The formula of the oil displacement agent comprises the following components: polyacrylamide 1+ viscoelastic ampholytic surfactant recovered from oilfield produced fluid, wherein the concentration of polyacrylamide 1 in the oil displacement agent is 300mg/L; formulation of viscoelastic amphoteric surfactant: in the oil displacement agent, the mass of the active ingredients is 1000mg/L of erucamide propyl hydroxysulfobetaine, 500mg/L of hexadecyl hydroxypropyl sulfobetaine, 500mg/L of octadecyl hydroxypropyl sulfobetaine and 500mg/L of lauramidopropyl betaine.
Test example 2-2
The formula of the oil displacement agent comprises the following components: polyacrylamide 1+viscoelastic amphoteric surfactant+sodium alginate+HEDP recovered from oilfield produced fluid, wherein the concentration of the polyacrylamide 1 in an oil displacement agent is 300mg/L, the concentration of the sodium alginate is 1000mg/L, and the concentration of the HEDP is 40mg/L; formulation of viscoelastic amphoteric surfactant: in the oil displacement agent, the mass of the active ingredients is 1000mg/L of erucamide propyl hydroxysulfobetaine, 500mg/L of hexadecyl hydroxypropyl sulfobetaine, 500mg/L of octadecyl hydroxypropyl sulfobetaine and 500mg/L of lauramidopropyl betaine.
FIG. 5 is a plot of recovery ratio change for test example 2-1 of the present application; FIG. 6 is a plot of recovery ratio change for test example 2-2 of the present application.
It can be seen that the oil displacement agent of test example 2-1 can improve the recovery ratio of crude oil by 16.35%, and the oil displacement agent of test example 2-1 can improve the recovery ratio of crude oil by 20.99%, so that the recovery ratio improvement effect of the compound system of the polyacrylamide solution, the viscoelastic amphoteric surfactant and the salt reinforcing agent recovered from the oilfield produced fluid is more remarkable.
Test example 3
Capillary displacement experiment of oil displacement agent of the embodiment of the application
Experimental method
An experimental setup was set up according to fig. 7.
First, liquid (displacement phase) is injected into the first liquid storage tank 10, and then one end of a capillary tube 20 with the length L is sealed into the first liquid storage tank 10; the liquid spontaneously permeates into the capillary tube 20 under the pressure of the capillary tube 20 and moves toward the end of the second reservoir 30 until the liquid fills the entire capillary tube 20. Waiting liquidThe capillary tube is immersed for more than half an hour, and is pressurized from the end of the second liquid storage tank 30, so that the water column is retracted to the first liquid storage tank 10, and the corresponding pressure value delta P is directly read out through a pressure sensor connected to the liquid storage tank. The pressure difference deltap between the two reservoirs is adjusted and recorded to displace the liquid by a predetermined distance from the capillary 20 by a predetermined data point, and the liquid-gas interface (meniscus) is passed through these x's during liquid-gas displacement 1 ，x 2 ，x 3 …, the rate of movement at equal positions. Based on this, a set of v- ΔP maps can be determined. And the v-delta P relation diagram under different conditions is measured by continuously adjusting the pressure difference between the two liquid storage tanks. The displacement process was recorded and displayed during the experiment using a CCD camera 40 and computer 50.
FIG. 8 is a graph showing the displacement rate of a polyacrylamide solution (unused) at a concentration of 300ppm versus the external pressure, wherein a is a graph showing the displacement rate of a polyacrylamide 1 solution versus the external pressure, and b is a graph showing the displacement rate of a polyacrylamide 2 solution versus the external pressure, wherein S w Represents the water content, and the mass of water is divided by the total weight to obtain the water content mass fraction.
At a concentration of 300ppm, the viscosity of both the polyacrylamide 1 solution and the polyacrylamide 2 solution alone was almost 10 mPas. It can be seen from FIG. 8 that they also do not show much difference in the v-. DELTA.P relationship when decane is displaced in a 10 μm capillary. The greater the pressure of the displacement, the greater the displacement rate. However, it should be noted that the capillary force of the two fluid flooding processes is negative-15 kPa, indicating that the flooding process is not spontaneous, and therefore, if the unused separate polyacrylamide 1 solution and polyacrylamide 2 solution are used for flooding, spontaneous flooding does not occur and forced flooding can only be performed under pressure.
FIG. 9 is a graph showing the relationship between displacement speed and external pressure of an oil displacement agent versus decane, wherein the oil displacement agent comprises the following formula: polyacrylamide 1+viscoelastic ampholytic surfactant with concentration of 2000mg/L and sodium silicate with concentration of 40mg/L PBTCA recovered from oilfield produced fluid, wherein the concentration of the polyacrylamide 1 is 296mg/L, and the formula of the viscoelastic ampholytic surfactant is as follows: in the oil displacement agent, the mass of the active ingredients is 1000mg/L of erucamide propyl hydroxysulfobetaine, 500mg/L of hexadecyl hydroxypropyl sulfobetaine, 500mg/L of octadecyl hydroxypropyl sulfobetaine and 500mg/L of lauramidopropyl betaine.
It can be seen that for the complex oil displacement agent system of the present embodiments, water displacement is possible in a suitable pipeline. It is also possible that the linear relationship of the results measured is not as good as that of a pure polymer system, because the samples are heterogeneous systems, but the overall still shows a linear relationship-the greater the pressure, the higher the displacement rate.
It is notable that the capillary forces during displacement obtained from the v- Δp plot are positive, that is, that this system is a process of oil recovery as an oil displacement agent, and that spontaneous displacement is present, which is quite different from polymer systems. The reason for this is probably that the composite system has the function of reducing the interfacial tension of crude oil/injected water in addition to the function of increasing the viscosity of the aqueous phase.
Although the embodiments of the present application are described above, the embodiments are only used for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (3)
1. An oil-displacing agent containing a viscoelastic surfactant, comprising: a polyacrylamide solution recovered from an oilfield produced fluid containing polyacrylamide, a viscoelastic amphoteric surfactant, a salt-type reinforcing agent, and a precipitation inhibitor, wherein the concentration of polyacrylamide in the oil displacement agent is 300mg/L or more, the concentration of the amphoteric surfactant is 2500mg/L to 5000mg/L by mass of an active ingredient, the concentration of the salt-type reinforcing agent is 500mg/L to 2000mg/L, and the concentration of the precipitation inhibitor is 30mg/L to 50mg/L;
wherein the polyacrylamide is anionic polyacrylamide, and the concentration of the polyacrylamide in the oil displacement agent is 300mg/L to 800mg/L;
The viscoelastic amphoteric surfactant is erucamide propyl hydroxysultaine, cetyl hydroxypropyl sulfobetaine, a mixture of octadecyl hydroxypropyl sulfobetaine and lauramidopropyl betaine, and in the oil displacement agent, the concentration of the erucamide propyl hydroxysultaine is 1000mg/L to 2000mg/L, the concentration of the cetyl hydroxypropyl sulfobetaine is 500mg/L to 1000mg/L, the concentration of the octadecyl hydroxypropyl sulfobetaine is 500mg/L to 1000mg/L, and the concentration of the lauramidopropyl betaine is 500mg/L to 1000mg/L, based on the mass of the active ingredient;
the salt reinforcing agent is selected from any one or more of sodium silicate, sodium alginate and sodium carbonate;
the precipitation inhibitor is selected from any one or more of 2-phosphonic butane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid and aminotrimethylene phosphonic acid.
2. The oil-displacing agent containing a viscoelastic surfactant according to claim 1, wherein the polyacrylamide is a hydrophobically associating anionic polyacrylamide.
3. A method of recycling oilfield produced fluid, comprising: oil-water separation is carried out on the oil field produced fluid containing polyacrylamide, and polyacrylamide solution is recovered; mixing the recovered polyacrylamide solution with a viscoelastic amphoteric surfactant, a salt enhancer and a precipitation inhibitor to obtain the oil displacement agent according to claim 1 or 2; and injecting the oil displacement agent into an oil well to displace oil.
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