CN116064019A - Oil displacement composition and preparation method and application thereof - Google Patents
Oil displacement composition and preparation method and application thereof Download PDFInfo
- Publication number
- CN116064019A CN116064019A CN202111276232.6A CN202111276232A CN116064019A CN 116064019 A CN116064019 A CN 116064019A CN 202111276232 A CN202111276232 A CN 202111276232A CN 116064019 A CN116064019 A CN 116064019A
- Authority
- CN
- China
- Prior art keywords
- monomer
- oil
- hydrophilic polymer
- hydrogen
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 73
- 239000000203 mixture Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229920001477 hydrophilic polymer Polymers 0.000 claims abstract description 54
- 238000011084 recovery Methods 0.000 claims abstract description 28
- -1 alkylbenzene sulfonate Chemical class 0.000 claims abstract description 26
- 239000004094 surface-active agent Substances 0.000 claims abstract description 21
- 230000009467 reduction Effects 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 140
- 239000000178 monomer Substances 0.000 claims description 82
- 239000001257 hydrogen Substances 0.000 claims description 36
- 229910052739 hydrogen Inorganic materials 0.000 claims description 36
- 125000000217 alkyl group Chemical group 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 26
- 150000002431 hydrogen Chemical class 0.000 claims description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 17
- 239000003999 initiator Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 239000011734 sodium Substances 0.000 claims description 11
- 125000006273 (C1-C3) alkyl group Chemical group 0.000 claims description 10
- 239000000295 fuel oil Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 7
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 125000002947 alkylene group Chemical group 0.000 claims description 6
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 3
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- DJEHXEMURTVAOE-UHFFFAOYSA-M potassium bisulfite Chemical compound [K+].OS([O-])=O DJEHXEMURTVAOE-UHFFFAOYSA-M 0.000 claims description 3
- 229940099427 potassium bisulfite Drugs 0.000 claims description 3
- 235000010259 potassium hydrogen sulphite Nutrition 0.000 claims description 3
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 claims description 3
- 235000019252 potassium sulphite Nutrition 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 3
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- HIVLDXAAFGCOFU-UHFFFAOYSA-N ammonium hydrosulfide Chemical compound [NH4+].[SH-] HIVLDXAAFGCOFU-UHFFFAOYSA-N 0.000 claims description 2
- 239000001284 azanium sulfanide Substances 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims 1
- 235000011130 ammonium sulphate Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 14
- 238000012360 testing method Methods 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 10
- 229920006395 saturated elastomer Polymers 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000003960 organic solvent Substances 0.000 description 7
- 229920002401 polyacrylamide Polymers 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000033558 biomineral tissue development Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 125000005233 alkylalcohol group Chemical group 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000007872 degassing Methods 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- 150000001555 benzenes Chemical class 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical group [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- AOSFMYBATFLTAQ-UHFFFAOYSA-N 1-amino-3-(benzimidazol-1-yl)propan-2-ol Chemical compound C1=CC=C2N(CC(O)CN)C=NC2=C1 AOSFMYBATFLTAQ-UHFFFAOYSA-N 0.000 description 1
- GVNVAWHJIKLAGL-UHFFFAOYSA-N 2-(cyclohexen-1-yl)cyclohexan-1-one Chemical compound O=C1CCCCC1C1=CCCCC1 GVNVAWHJIKLAGL-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 101150065749 Churc1 gene Proteins 0.000 description 1
- 244000208060 Lawsonia inermis Species 0.000 description 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 1
- 102100038239 Protein Churchill Human genes 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229920005603 alternating copolymer Polymers 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000013375 chromatographic separation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- ARZADRIAOMWMOJ-UHFFFAOYSA-M dodecyl-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;bromide Chemical compound [Br-].CCCCCCCCCCCC[N+](C)(C)CCOC(=O)C(C)=C ARZADRIAOMWMOJ-UHFFFAOYSA-M 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000007040 multi-step synthesis reaction Methods 0.000 description 1
- 125000001400 nonyl 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])[H] 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
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
Abstract
The oil displacement composition comprises a hydrophilic polymer and an alkylbenzene sulfonate surfactant, has good viscosity reduction and water phase tackifying effects, can effectively improve the recovery ratio of thickened oil, and can be used for thickened oil recovery, in particular to thickened oil recovery after water flooding.
Description
Technical Field
The disclosure relates to the technical field of thickened oil recovery, in particular to an oil displacement composition, a preparation method and application thereof.
Background
The thick oil has high viscosity, small fluidity and large exploitation difficulty. Thermal recovery techniques for improving the mobility of thick oil by heating the thick oil by injecting steam to reduce its viscosity remain the main recovery means of thick oil. Along with multi-wheel steam injection, the energy loss is large due to factors such as water content rising of the stratum, steam fingering and the like, the steam utilization rate is low, and the thickened oil exploitation cost is greatly increased. Compared with steam injection, water injection exploitation (water flooding for short) has the advantages of low cost and simple operation. The technical difficulty of the water-flooding thickened oil is that the viscosity of the thickened oil is higher than that of injected water, the water-oil fluidity ratio difference is large, the front edge of oil-water is irregular, viscous fingering and water channeling occur, and therefore the recovery ratio of the water-flooding thickened oil is low. Meanwhile, due to the influence of reservoir heterogeneity, the viscosity of crude oil is high, the permeability level difference is large, the water injection utilization rate is low, and a large amount of residual thickened oil is difficult to be affected, so that the injection recovery ratio in the water flooding process is generally lower than 20%.
Adding proper chemical agent to the water drive to improve the fluidity of the thickened oil and the swept area of the displacement fluid is a main mode for improving the recovery ratio of the thickened oil. At present, the water-flooding thick oil mainly forms O/W emulsion by adding a viscosity reducer, so as to reduce the viscosity of the thick oil and improve the fluidity of the thick oil, and a composition for reducing the viscosity of the thick oil is provided by a patent CN106520102A, and the viscosity reduction rate of the composition to common thick oil can reach more than 90%. However, the viscosity reducer can reduce the viscosity of the thick oil, but is easy to generate viscous finger water channeling and becomes ineffective water flooding.
The research and development of an oil displacement system with viscosity reduction and fluidity control is a main development direction for improving the water-flooding thickened oil efficiency. The patent CN109135709 discloses a viscosity-reducing oil displacement agent for thick oil exploitation, which is prepared by compounding a composition of a nonionic surfactant, a cationic oligomeric surfactant and C1-C6 organic micromolecular alcohol with polyacrylamide. Patent CN107365574A discloses a viscosity-reducing oil displacement system for a common heavy oil reservoir, which is mainly formed by compounding alkyl alcohol polyoxyethylene ether sulfate, a nonionic surfactant, an organic solvent and polyacrylamide, wherein the system improves the recovery ratio by 28% in a core displacement experiment when the using concentration is 0.3% -0.5%. In addition, patent CN107365575B discloses an oil displacement system which is formed by compounding an emulsifying agent, an ester compound, a wetting agent and polyacrylamide according to a certain proportion; CN1073655574 discloses a viscosity-reducing oil-displacing agent composed of alkyl alcohol polyoxyethylene ether sulfate, nonionic surfactant, anionic surfactant, organic solvent and water, which is compounded with polymer such as polyacrylamide to form an oil-displacing system when in use. The viscosity reduction oil displacement system disclosed in the patent above is prepared from different surface activities, small molecular organic solvents and polymers, and in actual use, the small molecular surfactant is large in dosage and poor in deep displacement effect, and has poor displacement effect on thick oil with formation viscosity exceeding 2000 mPa.S. Subsequently, the amphiphilic polymer has the advantages of simultaneously reducing the viscosity of thickened oil and improving the oil-water fluidity ratio because of the hydrophilic and lipophilic characteristics, and becomes a direction of attack. CN110028621a proposes that an amphiphilic polymer surfactant has a good viscosity reduction effect. The system is polymerized by styrene, linear alpha-olefin, nonyl/octyl phenol polyoxyethylene ether and the like, and the synthesis process involves the use of various organic solvents and multi-step synthesis and separation procedures. Patent CN 110041462A discloses a viscosity-reducing oil-displacing agent formed by polymerizing vinyl pyrrolidone, acrylamide and methacryloxypropyl trimethoxy silane, wherein the viscosity-reducing rate of the viscosity-reducing oil-displacing agent to common thickened oil can reach more than 98%. CN109135709a proposes a viscosity-reducing oil displacement system suitable for heavy oil reservoirs, which mainly comprises alkylphenol/alkyl alcohol polyoxyethylene ether, cationic oligomeric surfactant, organic small molecular alcohol and polyacrylamide, and has a certain effect in core displacement. However, the oil displacement system has a narrow application range, and the loss of the cationic surfactant in the carbonate reservoir is large, so that the displacement effect is affected. Patent CN108546315A adopts acrylamide, acrylic acid alkali metal salt, dimethyl diallyl ammonium chloride, methacryloxyethyl dimethyl dodecyl ammonium bromide and two amphiphilic dendritic unsaturated monomers with specific structures to prepare an amphiphilic polymer oil displacement agent, and has the functions of reducing viscosity and increasing water phase viscosity. The patent CN110483701 discloses a water-soluble hyperbranched thick oil viscosity-reducing oil displacement system, which is mainly used for oil reservoirs with low viscosity of thick oil, wherein the temperature of the oil reservoirs is about 65 ℃. The research of developing amphiphilic polymer and using the amphiphilic polymer in the field of thick oil exploitation has been well developed, but in general, the technology of amphiphilic polymer type viscosity-reducing oil displacement agent with viscosity reduction and fluidity improvement is still immature, the preparation process of the existing research is complex, the reaction time is long, multi-step separation is involved, a large amount of organic solvents are used, and potential safety hazards exist.
Disclosure of Invention
The oil displacement composition comprises a hydrophilic polymer and an alkylbenzene sulfonate surfactant, has good viscosity reduction and water phase tackifying effects, can effectively improve the recovery ratio of thickened oil, and can be used for thickened oil recovery, in particular to thickened oil recovery after water flooding.
To achieve the above object, a first aspect of the present disclosure provides a flooding composition for water-flooding a heavy oil reservoir, the flooding composition comprising an alkylbenzene sulfonate surfactant, a hydrophilic polymer, and water;
the content of the alkylbenzene sulfonate surfactant is 0.04-1 wt%, the content of the hydrophilic polymer is 0.05-1 wt% and the content of the water is 98-99 wt% based on the total weight of the oil displacement composition;
the molecular structure of the hydrophilic polymer comprises a structural subunit (I), a structural subunit (II) and a structural subunit (III) shown in the following formula:
* Represents a ligation site; r is R 1 One selected from C1-C13 linear alkyl groups; r is R 2 Selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following; r is R 3 One selected from hydrogen and C1-C18 linear alkyl; r is R 4 One selected from phenylene and C1-C3 alkylene; r ', R' 5 、R 6 、R 7 、R 8 、R 9 、R 10 And R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30; m is M 1 + Selected from Na + 、K + And NH 4 + One of them.
Optionally, the mass ratio of the alkylbenzene sulfonate to the hydrophilic polymer is (0.2-1): 1.
optionally, the structural subunit (I) has one or more of the structures represented by the structural formulae (I-1) to (I-6):
the structural subunit (II) has a structure shown in a structural formula (II-1):
the structural subunit (III) has a structure shown in a structural formula (III-1):
alternatively, R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
Optionally, the hydrophilic polymer comprises a structure represented by formula 1 below:
wherein the weight percentage of the structural subunit (I) in the hydrophilic polymer is 70-90%, the weight percentage of the structural subunit (II) in the hydrophilic polymer is 5-20%, and the weight percentage of the structural subunit (III) in the hydrophilic polymer is 1-10%.
Alternatively, the hydrophilic polymer has a weight average molecular weight of 4.0X10 5 -6.0×10 5 。
Optionally, the alkylbenzene sulfonate has a structure represented by the following formula (iv):
wherein R is 12 And R is 13 Each independently selected from one of hydrogen, C1-C3 alkyl;
R 14 and R is 15 Each independently selected from one of hydrogen, C12-C16 alkyl;
R 16 a linear alkyl group selected from C5-C12; and R is 12 、R 13 、R 14 、R 15 And R is 16 Are not hydrogen at the same time;
X + selected from Na + 、K + And NH 4 + One of them.
A second aspect of the present disclosure provides a method of preparing the flooding composition of the first aspect of the present disclosure, the method comprising the steps of:
(1) Adding a first monomer, a second monomer and a third monomer into water, and adding an initiator under inert atmosphere to perform contact reaction to obtain an aqueous solution containing the hydrophilic polymer;
(2) Mixing the hydrophilic polymer and the alkylbenzene sulfonate with water;
wherein the first monomer has a structure represented by formula (i), the second monomer has a structure represented by formula (ii), and the third monomer has a structure represented by formula (iii):
R 1 one selected from C1-C13 linear alkyl groups
R 2 Selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following;
R 3 one selected from hydrogen and C1-C18 linear alkyl;
R 4 one selected from phenylene and C1-C3 alkylene;
R’、R”、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 and R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30;
M 1 + selected from Na + 、K + And NH 4 + In (a) and (b)One of the two.
Optionally, in step (1), the weight ratio of the first monomer, the second monomer and the third monomer is (70-90): (5-20): (1-10);
the total weight fraction of the first monomer, the second monomer and the third monomer is 10-40% in terms of weight fraction based on the total weight of the aqueous solution;
the weight fraction of the initiator is 0.2-0.7% in terms of weight fraction based on the total weight of the first monomer, the second monomer and the third monomer.
Alternatively, the first monomer has a structure represented by any one of the following formulas (i-1) to (i-6):
the second monomer has a structure represented by the following formula (ii-1):
the third monomer has a structure represented by the following formula (ii i-1):
alternatively, R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
Optionally, the initiator comprises persulfate and sulfite; the weight ratio of the persulfate to the sulfite is (0.5-3): 1, a step of;
optionally, the persulfate comprises one or more of potassium persulfate, ammonium persulfate, potassium persulfate and sodium persulfate;
the sulfite comprises one or more of sodium bisulfite, sodium sulfite, potassium bisulfite, potassium sulfite, ammonium sulfite and ammonium bisulfide.
Optionally, in step (1), the conditions of the contacting reaction include: the temperature is 20-45 ℃ and the time is 2-8h;
optionally, the inert atmosphere comprises one or more of nitrogen, helium and argon.
A third aspect of the present disclosure provides the use of the flooding composition of the first aspect of the present disclosure for viscosity reduction of heavy oil and enhanced oil recovery.
Through the technical scheme, the oil displacement composition is formed by mixing the hydrophilic macromolecules and the surfactant, and compared with a single amphiphilic polymer oil displacement system, the viscosity reduction performance of the oil displacement system is better, and the viscosity of thick oil with the surface degassing viscosity of more than 2000 Pa.s can be reduced to below 100 mPa.s, so that the fluidity of the thick oil is greatly enhanced. Compared with the traditional polymer and surfactant compound system, after the hydrophilic macromolecules in the oil displacement composition are mixed with the surfactant, hydrophobic groups in the surfactant and hydrophobic chain segments of the hydrophilic macromolecules have association, and the association not only enables the macromolecular system to be stretched, but also increases apparent viscosity of the solution, improves water-oil fluidity ratio improving effect of the oil displacement agent, and simultaneously inhibits chromatographic separation of the oil displacement composition in the flowing process, so that the oil displacement system is ensured to have larger action radius, and deep viscosity reduction oil displacement purpose is achieved. In addition, compared with the traditional compound oil displacement system, the oil displacement composition has wider application range and has excellent flow improvement effect on thickened oil of a certain area of an oil field in victory and Henan province. Meanwhile, the invention also discloses a method for preparing the oil displacement composition, the preparation process of the oil displacement composition does not use an organic solvent, and the product can be directly mixed and crosslinked with an anionic surfactant through electrostatic and hydrogen bond interaction without separation and purification, so that the oil displacement composition can be used for thick oil exploitation, has a simple synthesis process, and is safe and environment-friendly.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is an infrared test spectrum of a hydrophilic polymer of example 8 of the present disclosure.
Fig. 2 is an emulsion microdispersion of an oil displacement composition of example 8 of the present disclosure on a block of a victory oil field.
Fig. 3 is an emulsion dispersion micrograph of the flooding composition of example 8 of the present disclosure for a heavy oil in a certain section of a henna field.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
A first aspect of the present disclosure provides an oil displacement composition for a water-flooding heavy oil reservoir, the oil displacement composition comprising an alkylbenzene sulfonate surfactant, a hydrophilic polymer, and water;
the content of the alkylbenzene sulfonate surfactant is 0.04-1 wt%, the content of the hydrophilic polymer is 0.05-1 wt% and the content of the water is 98-99 wt% based on the total weight of the oil displacement composition;
the molecular structure of the hydrophilic polymer comprises a structural subunit (I), a structural subunit (II) and a structural subunit (III) shown in the following formula:
* Represents a ligation site;
R 1 one selected from C1-C13 linear alkyl groups;
R 2 selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following;
R 3 one selected from hydrogen and C1-C18 linear alkyl;
R 4 selected from phenylene, C1-C3 alkyleneOne of the following;
R’、R”、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 and R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30;
M 1 + selected from Na + 、K + And NH 4 + One of them.
In the present disclosure, structural subunits refer to repeat units of a polymer, i.e., a hydrophilic polymer comprises a terpolymer of structural subunits (I), structural subunits (II) and structural subunits (III), which may be a block copolymer, a random copolymer or an alternating copolymer.
In the present disclosure, "phenylene" refers to a group formed after a phenyl group loses one hydrogen, and "C1-C3 alkylene" refers to a group formed after an alkyl group having 1 to 3 carbon atoms loses one hydrogen, and "straight-chain alkyl" refers to an alkyl group in which all carbon atoms are in the same straight chain.
In this disclosure, "each independently selected from" means that the specific options expressed between different symbols do not affect each other. For example, "R 12 And R is 13 One "each independently selected from hydrogen, C1-C3 alkyl means that R 12 And R is 13 May be the same or different, R 12 And R is 13 Is not affected by each other.
In one embodiment of the present disclosure, the mass ratio of alkylbenzene sulfonate to hydrophilic polymer is (0.2-1): 1, preferably (0.5-1): 1.
in one embodiment of the present disclosure, the structural subunit (I) has one or more of the structures represented by structural formulas (I-1) to (I-6):
the structural subunit (II) has a structure shown in a structural formula (II-1):
the structural subunit (III) has a structure represented by the structural formula (III-1):
in a preferred embodiment, R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
In one embodiment of the present disclosure, the hydrophilic polymer comprises a structure represented by formula 1 below:
in the above formula 1, a, b and c are integers greater than 0, and the values of a, b and c are such that the weight average molecular weight of the hydrophilic polymer is 4.0X10 5 -6.0×10 5 And such that the structural subunits (I) comprise 70 to 90 weight percent, preferably 75 to 85 weight percent, of the hydrophilic polymer; the weight percentage of the structural subunits (II) in the hydrophilic polymer is 5-20 wt%, preferably 10-20 wt%; the weight percentage of the structural subunits (III) in the hydrophilic polymer is 1 to 10 wt.%, preferably 2.5 to 10 wt.%. The weight percentage content that each structure subunit satisfies in the oil displacement composition that this embodiment provided can further improve the viscous crude viscosity reduction effect of oil displacement composition and better improve water oil fluidity ratio, improves viscous crude recovery ratio better on the basis of water drive.
In one embodiment of the present disclosure, the hydrophilic polymer has a weight average molecular weight of 4.0X10 5 -6.0×10 5 Preferably 4.1X10 5 -5.9×10 5 。
In one embodiment of the present disclosure, the alkylbenzene sulfonate has the structure shown in formula (iv):
wherein R is 12 And R is 13 Each independently selected from one of hydrogen, C1-C3 alkyl;
R 14 and R is 15 Each independently selected from one of hydrogen, C12-C16 alkyl;
R 16 a linear alkyl group selected from C5-C12; and R is 12 、R 13 、R 14 、R 15 And R is 16 Are not hydrogen at the same time;
M 1 + selected from Na + 、K + And NH 4 + One of them. Preferably, the alkylbenzene sulfonate is sodium dodecylbenzene sulfonate.
Wherein, "R 12 、R 13 、R 14 、R 15 And R is 16 Not simultaneously being hydrogen means that R 12 、R 13 、R 14 、R 15 And R is 16 Any one of them is hydrogen, any two are hydrogen, any three are hydrogen, or any four are hydrogen.
A second aspect of the present disclosure provides a method of preparing the flooding composition of the first aspect of the present disclosure, the method comprising the steps of:
(1) Adding a first monomer, a second monomer and a third monomer into water, and adding an initiator under inert atmosphere to perform contact reaction to obtain an aqueous solution containing the hydrophilic polymer;
(2) Mixing the hydrophilic polymer and the alkylbenzene sulfonate with water;
wherein the first monomer has a structure represented by formula (i), the second monomer has a structure represented by formula (ii), and the third monomer has a structure represented by formula (iii):
R 1 one selected from C1-C13 linear alkyl groups;
R 2 selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following;
R 3 one selected from hydrogen and C1-C18 linear alkyl;
R 4 one selected from phenylene and C1-C3 alkylene;
R’、R”、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 and R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30;
M 1 + selected from Na + 、K + And NH 4 + One of them.
The method for preparing the oil displacement composition uses water as a solvent, raw materials are easy to obtain, the process is simple, the reaction condition is mild, and the synthesized hydrophilic polymer is directly mixed and crosslinked with a surfactant without separation and purification to prepare the final oil displacement composition. Not only effectively reduces the production cost, but also does not involve the use and separation of organic solvents, has no pollutant emission and reduces the environmental pollution.
In one embodiment of the present disclosure, in step (1), the weight ratio of the first monomer, the second monomer, and the third monomer is (70-90): (5-20): (1-10), preferably (75-85): (10-20): (2.5-10).
In one embodiment of the present disclosure, the total weight fraction of the first monomer, the second monomer and the third monomer is 10-40%, preferably 15-30% by weight fraction based on the total weight of the aqueous solution.
In one embodiment of the present disclosure, the weight fraction of initiator is 0.2 to 0.7%, preferably 0.3 to 0.5% by weight based on the total weight of the first monomer, the second monomer and the third monomer.
In one embodiment of the present disclosure, the first monomer has a structure represented by any one of the following formulas (i-1) to (i-6):
the second monomer has a structure represented by the following formula (ii-1):
the third monomer has a structure represented by the following formula (ii i-1):
In one embodiment of the present disclosure, R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
In one embodiment of the present disclosure, the initiator includes persulfates and sulfites; the weight ratio of persulfate to sulfite is (0.5-3): 1, preferably (1-2): 1, a step of; the persulfate comprises one or more of potassium persulfate, ammonium persulfate, potassium persulfate and sodium persulfate; the sulfite comprises one or more of sodium bisulfite, sodium sulfite, potassium bisulfite, potassium sulfite, ammonium sulfite and ammonium bisulfite. This is conventional in the art and will not be described in detail herein.
In one embodiment of the present disclosure, in step (1), the conditions of the contacting reaction include: the temperature is 20-45 ℃ and the time is 2-8h; preferably, the temperature is 25-35 ℃ and the time is 4-6h.
In one embodiment of the present disclosure, the inert atmosphere comprises one or more of nitrogen, helium, and argon.
In one embodiment of the present disclosure, step (1) comprises adding the first monomer, the second monomer, and the third monomer to water, heating to a reaction temperature under an inert atmosphere, and adding an initiator to perform a contact reaction.
In one embodiment of the present disclosure, the method further comprises: and (3) drying the aqueous solution containing the hydrophilic polymer prepared in the step (1) to obtain a reaction product containing the hydrophilic polymer.
In the present disclosure, the water used in step (2) may be mineralized water, for example.
A third aspect of the present disclosure provides the use of the flooding composition of the first aspect of the present disclosure for viscosity reduction of heavy oil and enhanced oil recovery.
Preferably in the field of enhanced oil recovery.
The invention is further illustrated by the following examples, which are not intended to be limiting in any way.
The instruments, reagents, materials and the like used in the following examples and comparative examples are conventional instruments, reagents, materials and the like which are already known in the prior art unless otherwise specified; can be purchased through regular commercial paths;
the experimental methods, detection methods, and the like in the examples and comparative examples are conventional experimental methods, detection methods, and the like, unless otherwise specified.
Mineralized water used in examples and comparative examples was mineralized water in site in a certain area of victory and Henan, and mineralization degrees were 17130mg/L and 7240mg/L, respectively.
The weight average molecular weight tester was GPC.
C 13 H 27 CH＝CHCH 2 SO 3 Na and C 12 H 25 CH＝CH(CH 2 ) 2 SO 3 Na has a straight-chain structure.
Examples 1-13 illustrate methods of preparing the flooding compositions provided in the present invention.
The oil displacement composition is prepared by the following steps:
(1) Hydrophilic polymer preparation: 42g of distilled water is added into a three-port reaction bottle provided with a thermometer and a stirrer as a solvent, a first monomer, a second monomer and a third monomer are added according to a certain proportion, nitrogen is introduced after stirring and dissolving, an initiator is added, an aqueous solution containing hydrophilic polymer is obtained after reaction, and the hydrophilic polymer is obtained after drying.
(2) The oil displacement composition is prepared by the following steps: and (3) weighing the hydrophilic polymer prepared in the step (1) and dissolving the hydrophilic polymer and alkylbenzene sulfonate in 100mL of mineralized water according to a proportion, and mixing and stirring for 12 hours to obtain the oil displacement composition.
Wherein the types and amounts of the first monomer, the second monomer, the third monomer, the initiator and the alkylbenzene sulfonate, and the reaction conditions are shown in tables 1 and 2.
The hydrophilic polymer A8 of example 8 comprises a structure represented by the formula:
the hydrophilic polymer A8 was subjected to infrared spectroscopic testing, and the result was shown in fig. 1, with a test instrument of PerkinElmer spectrum (U.S.).
As can be seen from fig. 1, the key absorption peaks of the infrared spectrum of the hydrophilic polymer A8 include: 3429cm -1 Is amide (NH) absorption peak, 1122cm -1 Is C-N absorption peak; 2929cm -1 is-CH 2 An absorption peak; 1663cm -1 For C=O absorption peak 1458cm -1 Is benzene ring absorption band and 840cm -1 Is indicated as para-substituted benzene, 1416cm -1 Is CH 2 、-CH 3 Is not shown; 1200cm -1 、1068cm -1 Is a sulfonic acid group absorption peak, 1038cm -1 ，1008cm -1 ，956cm -1 Is C-O-C absorption peak, 840cm -1 771cm for para-substituted benzene absorption peak -1 Is- [ CH ] 2 -CH 2 ]n, where n>Absorption peak of 4.
Comparative example 1
Commercially available sodium dodecyl benzene sulfonate surfactant and polyacrylamide (weight average molecular weight of 800-2000 ten thousand) were selected as comparative reagents, both of which were purchased from enokava ltd. The surfactant and polyacrylamide were prepared in a mass ratio of 1:1 to give a surfactant-polymer aqueous solution of 0.05 wt%, which was designated as displacement composition D1.
Comparative example 2
The flooding composition D2 was prepared by the method of example 1, except that the first monomer was not added, the second monomer, the third monomer, the kind and amount of initiator and alkylbenzene sulfonate, and the reaction conditions were as shown in table 2.
Comparative example 3
The flooding composition D3 was prepared by the method of example 1, except that the second monomer was not added in the preparation of the polymer, the kinds, amounts of the first monomer, the third monomer, the initiator and the alkylbenzene sulfonate, and the reaction conditions are shown in table 2.
Comparative example 4
The flooding composition D4 was prepared by the method of example 1, except that no third monomer was added in the preparation of the polymer, the kinds, amounts of the first monomer, the second monomer, the initiator and the alkylbenzene sulfonate, and the reaction conditions are shown in table 2.
TABLE 1
TABLE 2
In tables 1 and 2, a refers to the weight ratio of the first monomer, the second monomer, and the third monomer;
b refers to the total weight fraction of the first monomer, the second monomer and the third monomer in terms of weight fraction, based on the total weight of the aqueous solution containing the hydrophilic polymer;
c refers to the weight fraction of the initiator in terms of weight fraction based on the total weight of the first monomer, the second monomer and the third monomer;
d refers to the weight ratio of persulfate to sulfite;
e refers to the content of the surfactant in terms of weight percent based on the total weight of the oil displacement composition;
f refers to the weight ratio of surfactant to hydrophilic polymer;
g refers to the hydrophilic polymer content in weight percent based on the total weight of the flooding composition.
Test examples 1 to 3
The water samples are mineralized water of a victory oilfield site and mineralized water of a Henan oilfield site, and the water mineralization of the victory oilfield site is 17130mg/L and the water mineralization of the Henan oilfield site is 7240mg/L through tests.
The oil samples used were a thickened oil sample of a section of the victory oil field (surface degassing viscosity of 5332 mPas at 50 ℃ C., water content of 5.1 wt%) and a thickened oil sample of a section of the Henan oil field (surface degassing viscosity of 2315 mPas at 50 ℃ C., water content of 10.3 wt%) respectively.
Test example 1
The test example is used for explaining the viscosity reduction performance test process of the oil displacement composition provided by the invention.
a. Respectively keeping the temperature of the victory thick oil and the Henan thick oil in a water bath at 50 ℃ for 30min;
b. after the oil displacement compositions of examples 1 to 8 and comparative examples 1 to 4 were mixed with the thickened oil samples in a mass ratio of 3:7, the mixture was stirred at a constant temperature of 50℃for 10 minutes, and the emulsion viscosity was measured by HAKKE MARS III, and the results are shown in Table 3.
TABLE 3 Table 3
According to the data in Table 3, compared with the oil displacement compositions of comparative examples 1-4, the oil displacement composition provided by the embodiment of the application can effectively reduce the viscosity of a thickened oil sample, the viscosity reduction rate of the thickened oil sample on a certain area of a Henan oilfield is 96.3-97.7%, and the viscosity reduction rate of the thickened oil sample on a certain area of a Shengan oilfield is 98.1-98.6%.
Test example 2
The test example is used for explaining the adhesion promotion capability evaluation process of the oil displacement composition provided by the invention on the water phase.
The viscosity of the flooding compositions of examples 1-8 and comparative examples 1-4 were tested at 50 ℃ using a HAKKE MARS iii rheometer, and the results are shown in table 4.
TABLE 4 Table 4
In the oil recovery field, the water-to-oil mobility ratio refers to the ratio of the permeation rates of the displacement fluid and the driven displacement phase (oil), inversely proportional to the viscosity of the fluid. From the data in Table 4, it is understood that the oil displacement compositions provided in examples 1 to 8 of the present application are capable of increasing the viscosity of the aqueous solution, i.e., improving the water-to-oil fluidity ratio, better than the oil displacement compositions of comparative examples 1 to 4.
Test example 3
The test example is used for illustrating the oil displacement performance test process of the oil displacement composition.
S1, drying an artificial rock core in a baking oven at 120 ℃ to constant weight, and accurately measuring the size of the rock core and the air permeability;
s2, after the rock core is saturated by distilled water, the pore volume of the rock core is measured. Recording the volume of saturated crude oil by using a saturated core of thick oil dehydrated by a certain block of a victory oil field;
s3, continuously injecting an on-site water sample (mineralization 17130 mg/L) of a certain area of the victory oil field into the core of the saturated oil at 50 ℃ until the oil content in the flooding liquid is less than 1%. Injecting the oil displacement compositions of examples 1-8 and comparative examples 1-4 to 0.5PV, injecting the mineralized water in situ to drive oil until the oil content in the drive liquid is lower than 1%, and calculating the recovery ratio improvement amount of the oil displacement composition on the victory thickened oil on the basis of water flooding;
and S4, after the core is saturated by distilled water, measuring the pore volume of the core. Recording the volume of saturated crude oil by using a thick oil saturated core dehydrated by a certain block of a Henan oilfield;
s5, continuously injecting an on-site water sample (mineralization 7240 mg/L) of a certain area of a Henan oilfield into a core of saturated oil at 50 ℃ until the oil content in the flooding liquid is less than 1%. The oil-displacing compositions of examples 1-8 and comparative examples 1-4 were injected at 0.5PV, and the mineralized water in situ was again injected to displace oil to an oil content of less than 1% in the displaced fluid, and the oil-displacing composition was calculated to increase the recovery ratio of Henan heavy oil on a water flooding basis, and the results are shown in Table 5.
The core gas permeability is measured by a permeability measuring instrument manufactured by Dongda stone instrument company; the oil displacement test is evaluated by adopting an oil displacement simulating and evaluating device produced by Dongda instrument company.
TABLE 5
| Oil displacement system | Victory oil field oil sample enhanced recovery/% | Oil sample in river field for raising recovery ratio |
| A1 | 18.7 | 14.3 |
| A2 | 19.3 | 14.7 |
| A3 | 21.7 | 17.7 |
| A4 | 27.4 | 19.7 |
| A5 | 27.1 | 19.5 |
| A6 | 24.3 | 18.9 |
| A7 | 25.4 | 19.3 |
| A8 | 26.0 | 19.4 |
| D1 | 8.7 | 5.7 |
| D2 | 9.2 | 7.1 |
| D3 | 11.2 | 8.9 |
| D4 | 10.7 | 7.6 |
As can be seen from the data in Table 5, the oil displacement composition of the invention can improve the recovery ratio of a certain thick oil block of a victory oil field by 18.7-27.4% on the basis of water displacement, and improve the recovery ratio of a certain thick oil block of Henan by 14.3-19.7%, which are all superior to those of comparative examples 1-4. The oil displacement composition containing the hydrophilic polymer has better displacement effect.
According to the viscosity reduction test, the aqueous phase viscosity increase and the displacement test, the oil displacement composition containing the hydrophilic polymer has good viscosity reduction and aqueous phase viscosity increase effects, can effectively improve the recovery ratio of thickened oil, and can be used for thickened oil recovery, in particular to thickened oil recovery after water flooding.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (13)
1. An oil displacement composition for a water-flooding heavy oil reservoir, characterized in that the oil displacement composition comprises an alkylbenzene sulfonate surfactant, a hydrophilic polymer and water;
the content of the alkylbenzene sulfonate surfactant is 0.04-1 wt%, the content of the hydrophilic polymer is 0.05-1 wt% and the content of the water is 98-99 wt% based on the total weight of the oil displacement composition;
the molecular structure of the hydrophilic polymer comprises a structural subunit (I), a structural subunit (II) and a structural subunit (III) shown in the following formula:
* Represents a ligation site;
R 1 one selected from C1-C13 linear alkyl groups;
R 2 selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following;
R 3 one selected from hydrogen and C1-C18 linear alkyl;
R 4 one selected from phenylene and C1-C3 alkylene;
R’、R”、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 and R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30;
M 1 + selected from Na + 、K + And NH 4 + One of them.
2. The flooding composition of claim 1, wherein the mass ratio of said alkylbenzene sulfonate to said hydrophilic polymer is (0.2-1): 1.
3. the flooding composition of claim 1, wherein said structural subunit (I) has one or more of the structures represented by structural formulae (I-1) to (I-6):
the structural subunit (II) has a structure shown in a structural formula (II-1):
the structural subunit (III) has a structure shown in a structural formula (III-1):
4. the flooding composition of claim 1, wherein R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
5. The flooding composition of claim 1, wherein said hydrophilic polymer comprises a structure represented by formula 1:
wherein the weight percentage of the structural subunit (I) in the hydrophilic polymer is 70-90%, the weight percentage of the structural subunit (II) in the hydrophilic polymer is 5-20%, and the weight percentage of the structural subunit (III) in the hydrophilic polymer is 1-10%.
6. The flooding composition of claim 1, wherein said hydrophilic polymer has a weight average molecular weight of 4.0 x 10 5 -6.0×10 5 。
7. The oil-displacing composition of claim 1, wherein the alkylbenzene sulfonate has a structure represented by the following formula (iv):
wherein R is 12 And R is 13 Each independently selected from one of hydrogen, C1-C3 alkyl;
R 14 and R is 15 Each independently selected from one of hydrogen, C12-C16 alkyl;
R 16 a linear alkyl group selected from C5-C12; and R is 12 、R 13 、R 14 、R 15 And R is 16 Are not hydrogen at the same time;
X + selected from Na + 、K + And NH 4 + One of them.
8. A method of preparing the flooding composition of any one of claims 1-7, characterized in that the method comprises the steps of:
(1) Adding a first monomer, a second monomer and a third monomer into water, and adding an initiator under inert atmosphere to perform contact reaction to obtain an aqueous solution containing the hydrophilic polymer;
(2) Mixing the hydrophilic polymer and the alkylbenzene sulfonate with water;
wherein the first monomer has a structure represented by formula (i), the second monomer has a structure represented by formula (ii), and the third monomer has a structure represented by formula (iii):
R 1 one selected from C1-C13 linear alkyl groups
R 2 Selected from the group consisting of-N (R') (R "), -OH and-OCH 3 One of the following;
R 3 one selected from hydrogen and C1-C18 linear alkyl;
R 4 one selected from phenylene and C1-C3 alkylene;
R’、R”、R 5 、R 6 、R 7 、R 8 、R 9 、R 10 and R is 11 Each independently selected from one of hydrogen, C1-C3 alkyl; n is any integer from 2 to 30;
M 1 + selected from Na + 、K + And NH 4 + One of them.
9. The method of claim 8, wherein in step (1), the weight ratio of the first monomer, the second monomer, and the third monomer is (70-90): (5-20): (1-10);
the total weight fraction of the first monomer, the second monomer and the third monomer is 10-40% in terms of weight fraction based on the total weight of the aqueous solution;
the weight fraction of the initiator is 0.2-0.7% in terms of weight fraction based on the total weight of the first monomer, the second monomer and the third monomer.
10. The method according to claim 8, wherein the first monomer has a structure represented by any one of the following formulas (i-1) to (i-6):
the second monomer has a structure represented by the following formula (ii-1):
the third monomer has a structure represented by the following formula (ii i-1):
alternatively, R 3 Selected from one of hydrogen and C9-C18 linear alkyl.
11. The method of claim 8, wherein the initiator comprises persulfates and sulfites; the weight ratio of the persulfate to the sulfite is (0.5-3): 1, a step of;
optionally, the persulfate comprises one or more of potassium persulfate, ammonium sulfate, potassium persulfate and sodium persulfate;
the sulfite comprises one or more of sodium bisulfite, sodium sulfite, potassium bisulfite, potassium sulfite, ammonium sulfite and ammonium bisulfide.
12. The method of claim 8, wherein in step (1), the conditions of the contact reaction comprise: the temperature is 20-45 ℃ and the time is 2-8h;
optionally, the inert atmosphere comprises one or more of nitrogen, helium and argon.
13. Use of the flooding composition of any one of claims 1-7 for viscosity reduction of heavy oil and enhanced oil recovery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111276232.6A CN116064019A (en) | 2021-10-29 | 2021-10-29 | Oil displacement composition and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111276232.6A CN116064019A (en) | 2021-10-29 | 2021-10-29 | Oil displacement composition and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116064019A true CN116064019A (en) | 2023-05-05 |
Family
ID=86182435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111276232.6A Pending CN116064019A (en) | 2021-10-29 | 2021-10-29 | Oil displacement composition and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116064019A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702319A (en) * | 1986-12-29 | 1987-10-27 | Exxon Research And Engineering Company | Enhanced oil recovery with hydrophobically associating polymers containing sulfonate functionality |
| US20100197529A1 (en) * | 2007-09-11 | 2010-08-05 | Snf S.A.S. | Process for enhanced oil recovery |
| CA2742431A1 (en) * | 2010-06-11 | 2011-12-11 | Petrochina Company Limited | A surfactant, the preparation of the same and use thereof |
| CN105175627A (en) * | 2015-07-27 | 2015-12-23 | 长江大学 | Foam-type surfactant polymer used for displacement of reservoir oil and preparation method therefor |
| CN105949386A (en) * | 2016-04-29 | 2016-09-21 | 西南石油大学 | Temperature-resistant and salt-resistant amphoteric hydrophobic association polymer and preparation method thereof |
| WO2017113773A1 (en) * | 2015-12-29 | 2017-07-06 | 四川光亚聚合物化工有限公司 | Hydrophobic associated polymer and preparation method therefor |
| CN107955592A (en) * | 2017-11-24 | 2018-04-24 | 山东大学 | A kind of heavy crude thinner of demulsification certainly and preparation method and application |
| CN110483701A (en) * | 2019-08-27 | 2019-11-22 | 西南石油大学 | A kind of water-soluble ultrabranching reducing thick oil viscosity oil displacement agent and preparation method thereof |
| CN110511329A (en) * | 2019-07-18 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of polymeric surfactant and its preparation method and application containing aromatic radical |
| CN110591023A (en) * | 2019-10-09 | 2019-12-20 | 中国石油天然气股份有限公司 | Amphiphilic polymer containing capped polyether structure and preparation and application thereof |
| CN110699058A (en) * | 2019-10-14 | 2020-01-17 | 中国石油化工股份有限公司 | Osmotic modified viscosity-reducing oil displacement agent for water-flooding thickened oil and preparation method thereof |
| CN110746551A (en) * | 2019-10-09 | 2020-02-04 | 中国石油天然气股份有限公司 | Copolymer containing double-polyoxyethylene-ether branched chain structure and preparation and application thereof |
| US10570239B1 (en) * | 2017-05-16 | 2020-02-25 | Southwest Petroleum University | Surface-active two-tailed hydrophobic associated polymer and preparation method thereof |
| WO2020079123A1 (en) * | 2018-10-18 | 2020-04-23 | Basf Se | Method of fracturing subterranean formations using aqueous solutions comprising hydrophobically associating copolymers |
| CN112375185A (en) * | 2020-11-27 | 2021-02-19 | 中国石油大学(华东) | Small-molecule thick oil viscosity reduction polymer and preparation method thereof |
-
2021
- 2021-10-29 CN CN202111276232.6A patent/CN116064019A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4702319A (en) * | 1986-12-29 | 1987-10-27 | Exxon Research And Engineering Company | Enhanced oil recovery with hydrophobically associating polymers containing sulfonate functionality |
| US20100197529A1 (en) * | 2007-09-11 | 2010-08-05 | Snf S.A.S. | Process for enhanced oil recovery |
| CA2742431A1 (en) * | 2010-06-11 | 2011-12-11 | Petrochina Company Limited | A surfactant, the preparation of the same and use thereof |
| CN105175627A (en) * | 2015-07-27 | 2015-12-23 | 长江大学 | Foam-type surfactant polymer used for displacement of reservoir oil and preparation method therefor |
| WO2017113773A1 (en) * | 2015-12-29 | 2017-07-06 | 四川光亚聚合物化工有限公司 | Hydrophobic associated polymer and preparation method therefor |
| CN105949386A (en) * | 2016-04-29 | 2016-09-21 | 西南石油大学 | Temperature-resistant and salt-resistant amphoteric hydrophobic association polymer and preparation method thereof |
| US10570239B1 (en) * | 2017-05-16 | 2020-02-25 | Southwest Petroleum University | Surface-active two-tailed hydrophobic associated polymer and preparation method thereof |
| CN107955592A (en) * | 2017-11-24 | 2018-04-24 | 山东大学 | A kind of heavy crude thinner of demulsification certainly and preparation method and application |
| WO2020079123A1 (en) * | 2018-10-18 | 2020-04-23 | Basf Se | Method of fracturing subterranean formations using aqueous solutions comprising hydrophobically associating copolymers |
| CN110511329A (en) * | 2019-07-18 | 2019-11-29 | 中国石油天然气股份有限公司 | A kind of polymeric surfactant and its preparation method and application containing aromatic radical |
| CN110483701A (en) * | 2019-08-27 | 2019-11-22 | 西南石油大学 | A kind of water-soluble ultrabranching reducing thick oil viscosity oil displacement agent and preparation method thereof |
| CN110591023A (en) * | 2019-10-09 | 2019-12-20 | 中国石油天然气股份有限公司 | Amphiphilic polymer containing capped polyether structure and preparation and application thereof |
| CN110746551A (en) * | 2019-10-09 | 2020-02-04 | 中国石油天然气股份有限公司 | Copolymer containing double-polyoxyethylene-ether branched chain structure and preparation and application thereof |
| CN110699058A (en) * | 2019-10-14 | 2020-01-17 | 中国石油化工股份有限公司 | Osmotic modified viscosity-reducing oil displacement agent for water-flooding thickened oil and preparation method thereof |
| CN112375185A (en) * | 2020-11-27 | 2021-02-19 | 中国石油大学(华东) | Small-molecule thick oil viscosity reduction polymer and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 李勇，樊红旗，向荣，东野升富，彭国勋: "新型温度自适应性驱油剂的合成及性能评价", 合成化学, vol. 29, no. 10, pages 878 - 883 * |
| 钱钦;于田田;柏永青;林吉生;张淮浩: "两亲性嵌段聚合物稠油降黏剂的合成与性能评价", 科学技术与工程, vol. 20, no. 8, pages 3035 - 3041 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wang et al. | Onset of aggregation for water-soluble polymeric associative thickeners: a fluorescence study | |
| CN112375185B (en) | Small-molecule thick oil viscosity reduction polymer and preparation method thereof | |
| US6433075B1 (en) | Surfactant based gelling composition for wellbore service fluids | |
| Xu et al. | Thickening carbon dioxide with the fluoroacrylate-styrene copolymer | |
| AU2009239528B2 (en) | Composition and method for recovering hydrocarbon fluids from a subterranean reservoir | |
| CN103965856A (en) | Polymer and surfactant binary system for oil displacement, and oil displacement method | |
| CN109401735B (en) | Water-based drilling fluid capable of resisting high temperature and calcium and protecting oil and gas reservoir and application thereof | |
| CN109135709B (en) | Viscosity-reducing oil displacement agent and oil displacement system suitable for heavy oil reservoir | |
| EP2738191B1 (en) | Amphiphilic macromolecule and use | |
| CN106590586B (en) | Oil displacement agent for tertiary oil recovery | |
| CN102618246A (en) | Composite foam flooding method suitable for oil field exploitation | |
| CN110627930B (en) | Polymer viscosity reducer for thickened oil and preparation method thereof | |
| CN113185630A (en) | Biodegradable salt-tolerant thickening system and preparation method and application thereof | |
| Zhao et al. | Experimental study and application of anti-salt polymer aqueous solutions prepared by produced water for low-permeability reservoirs | |
| CN113583191A (en) | Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid and preparation method and application thereof | |
| EP2738190B1 (en) | Amphiphilic macromolecule and use | |
| CN116064019A (en) | Oil displacement composition and preparation method and application thereof | |
| CN102373047B (en) | Composition for improving recovery rate of oil field and preparation method thereof | |
| CN109749007A (en) | Polymer and its preparation method and application with surface active function | |
| CN110317295A (en) | A kind of bioactive molecule thinner and preparation method thereof | |
| CN106590569B (en) | Enhanced oil recovery method for improving recovery ratio | |
| CN106317304B (en) | A kind of polymer and its preparation method and application with surface active function | |
| CN110483299A (en) | A kind of polymerisable surfactant of the structure containing aromatic hydrocarbons and preparation method thereof | |
| CA1241150A (en) | Acrylamide polymerization | |
| CN115725082A (en) | Viscosity-reducing oil displacement agent and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |