CN109679623B - Oil displacement composition containing sulfobetaine type surfactant, preparation method and application thereof - Google Patents
Oil displacement composition containing sulfobetaine type surfactant, preparation method and application thereof Download PDFInfo
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- CN109679623B CN109679623B CN201710974671.1A CN201710974671A CN109679623B CN 109679623 B CN109679623 B CN 109679623B CN 201710974671 A CN201710974671 A CN 201710974671A CN 109679623 B CN109679623 B CN 109679623B
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- amphoteric surfactant
- inorganic salt
- alkylene
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- 239000004094 surface-active agent Substances 0.000 title claims abstract description 73
- 239000000203 mixture Substances 0.000 title claims abstract description 63
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 38
- PSBDWGZCVUAZQS-UHFFFAOYSA-N (dimethylsulfonio)acetate Chemical compound C[S+](C)CC([O-])=O PSBDWGZCVUAZQS-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229940117986 sulfobetaine Drugs 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 20
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000002280 amphoteric surfactant Substances 0.000 claims abstract description 30
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 25
- 229960003237 betaine Drugs 0.000 claims abstract description 24
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 12
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 11
- 125000003342 alkenyl group Chemical group 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 239000003153 chemical reaction reagent Substances 0.000 claims description 20
- 230000009435 amidation Effects 0.000 claims description 15
- 238000007112 amidation reaction Methods 0.000 claims description 15
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 5
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 5
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 150000004820 halides Chemical class 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 238000006277 sulfonation reaction Methods 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 150000002823 nitrates Chemical class 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- IZWSFJTYBVKZNK-UHFFFAOYSA-O N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonic acid Chemical compound CCCCCCCCCCCC[N+](C)(C)CCCS(O)(=O)=O IZWSFJTYBVKZNK-UHFFFAOYSA-O 0.000 claims 1
- 230000035484 reaction time Effects 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 6
- 229920000642 polymer Polymers 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 59
- 238000011156 evaluation Methods 0.000 description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 30
- 238000003756 stirring Methods 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 15
- CYOIAXUAIXVWMU-UHFFFAOYSA-N 2-[2-aminoethyl(2-hydroxyethyl)amino]ethanol Chemical compound NCCN(CCO)CCO CYOIAXUAIXVWMU-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 238000011084 recovery Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 10
- -1 ether tertiary amine Chemical class 0.000 description 10
- 238000010926 purge Methods 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- IJXHLVMUNBOGRR-UHFFFAOYSA-N methyl nonanoate Chemical compound CCCCCCCCC(=O)OC IJXHLVMUNBOGRR-UHFFFAOYSA-N 0.000 description 6
- UMJJNXFVAMHNIE-UHFFFAOYSA-N ClCC[Na] Chemical compound ClCC[Na] UMJJNXFVAMHNIE-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 5
- 229910001863 barium hydroxide Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 230000003472 neutralizing effect Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- FLIACVVOZYBSBS-UHFFFAOYSA-N Methyl palmitate Chemical compound CCCCCCCCCCCCCCCC(=O)OC FLIACVVOZYBSBS-UHFFFAOYSA-N 0.000 description 4
- BIRUBGLRQLAEFF-UHFFFAOYSA-N Triacontanoic acid methyl ester Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(=O)OC BIRUBGLRQLAEFF-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000021523 carboxylation Effects 0.000 description 3
- 238000006473 carboxylation reaction Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- UKISQBBASUVXLD-UHFFFAOYSA-N triacontanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC(N)=O UKISQBBASUVXLD-UHFFFAOYSA-N 0.000 description 3
- LYFYWXLKKQIOKO-UHFFFAOYSA-N 3,3-diaminopentan-1-ol Chemical compound CCC(N)(N)CCO LYFYWXLKKQIOKO-UHFFFAOYSA-N 0.000 description 2
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 2
- HPEUJPJOZXNMSJ-UHFFFAOYSA-N Methyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC HPEUJPJOZXNMSJ-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 2
- ZYNDJIBBPLNPOW-UHFFFAOYSA-N eurucic acid methyl ester Natural products CCCCCCCCC=CCCCCCCCCCCCC(=O)OC ZYNDJIBBPLNPOW-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- ZYNDJIBBPLNPOW-KHPPLWFESA-N methyl erucate Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(=O)OC ZYNDJIBBPLNPOW-KHPPLWFESA-N 0.000 description 2
- 239000000693 micelle Substances 0.000 description 2
- GHLZUHZBBNDWHW-UHFFFAOYSA-N nonanamide Chemical compound CCCCCCCCC(N)=O GHLZUHZBBNDWHW-UHFFFAOYSA-N 0.000 description 2
- FBUKVWPVBMHYJY-UHFFFAOYSA-N noncarboxylic acid Natural products CCCCCCCCC(O)=O FBUKVWPVBMHYJY-UHFFFAOYSA-N 0.000 description 2
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- TZLNJNUWVOGZJU-UHFFFAOYSA-M sodium;3-chloro-2-hydroxypropane-1-sulfonate Chemical compound [Na+].ClCC(O)CS([O-])(=O)=O TZLNJNUWVOGZJU-UHFFFAOYSA-M 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- CWXQYEALBBFIDI-UHFFFAOYSA-N 2-[1-aminopropyl(2-hydroxyethyl)amino]ethanol Chemical compound CCC(N)N(CCO)CCO CWXQYEALBBFIDI-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 235000019387 fatty acid methyl ester Nutrition 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 125000001802 myricyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 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 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- BVIXLMYIFZGRBH-UHFFFAOYSA-M sodium;2-chloroethanesulfonate Chemical compound [Na+].[O-]S(=O)(=O)CCCl BVIXLMYIFZGRBH-UHFFFAOYSA-M 0.000 description 1
- 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 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Cosmetics (AREA)
Abstract
The invention relates to an oil displacement composition containing a sulfobetaine type surfactant, and a preparation method and application thereof. The method mainly solves the problems that the macromolecular polymer in the compound flooding of the prior production technology is easy to cause stratum blockage and difficult to inject in a medium-low permeability oil reservoir. The oil displacement composition comprises a betaine amphoteric surfactant and inorganic salt; wherein the structure of the betaine amphoteric surfactant is shown as a formula (I), R1Is selected from C6～C29Any one of alkyl and alkenyl of (A), R3And R4Is selected from C1～C12Any one of alkylene and hydroxy-substituted alkylene of (2), wherein m + n is 0 to 100, and x + y is 0 to 100; the molar ratio of the betaine amphoteric surfactant to the inorganic salt is 1: 0.01-1: the technical scheme of 100 better solves the technical problem and can be used for oil displacement production of oil fields.
Description
Technical Field
The invention relates to an oil displacement composition containing a sulfobetaine type surfactant, and a preparation method and application thereof.
Background
Chemical flooding is the main method for tertiary oil recovery, and surfactant flooding is considered as a chemical agent which can greatly improve the recovery ratio, has wide application range and has the greatest development prospect. The surfactant can be used as a main agent or an auxiliary agent for oil displacement, and plays an immeasurable role in greatly improving the recovery ratio.
The main mechanisms by which the use of surfactants can enhance oil recovery are: after the oil field enters a high water content period, the oil is leftA discontinuous oil film is trapped in pores of oil reservoir rocks, two main forces acting on oil droplets are viscous force and capillary force, and if a proper surfactant system is selected, the interfacial tension between oil and water is reduced, so that the interfacial tension between oil and water in an oil reservoir is reduced to a lower or ultralow value (10 mN/m) from 20-30 mN/m-3～10-4mN/m), the resistance caused by the deformation of oil droplets when the residual oil moves can be reduced, and the oil displacement efficiency is greatly improved. The surfactant flooding enhanced oil recovery rate is mainly determined by the sweep efficiency and the oil displacement efficiency of the surfactant in an oil layer.
I.e., Er-E upsilon. Ed
In the formula: er represents recovery ratio,%; e upsilon represents sweep efficiency,%; ed represents the oil displacement efficiency,%.
Therefore, increasing Er must start with increasing Ev and Ed. The active agent (including surfactant and alkali) has the effect of reducing oil-water interfacial tension and the like, so that the Ed (oil displacement efficiency) can be improved. This effect can be described by the combined effect parameter capillary number (N):
Ed∝N
n-driving force/viscosity force-ow
In the formula: μ represents the injected phase viscosity; v represents the injection phase fluid flow velocity; y isowIndicating the interfacial tension between oil and water.
Practice proves that the number of capillary tubes needs to be increased by 3-4 orders of magnitude to effectively reduce the saturation degree of residual oil. The viscosity of the injection phase is increased, and the oil-water interfacial tension Y is increasedowThe reduction by 3 or more orders of magnitude, thereby greatly improving the number of capillary tubes and obviously improving the Ed (oil displacement efficiency), which is also the main oil displacement mechanism of the active agent. The main method for improving sweep efficiency is to reduce the mobility of the displacement fluid, which can be achieved by increasing the viscosity of the displacement fluid by adding a substance with higher viscosity. The viscoelastic surfactant can reduce the oil-water interfacial tension, reduce the capillary resistance of an oleophylic oil layer, increase the capillary number and improve the oil displacement efficiency, and in addition, the viscoelastic surfactant has certain viscosity, improves the oil-water seepage ratio, enlarges the sweep efficiency and improves the recovery ratio. Thus, the development of surfactants having a viscoelastic betaine typeThe development is paid more and more attention and attention, and the development is one of the hot spots of research in the field of tertiary oil recovery.
Therefore, the surfactant composition provided by the invention does not contain a macromolecular polymer, the viscosity of the composition is adjusted by virtue of a polymer formed by the surfactant and an inorganic salt, the goals of reducing pressure and increasing injection are achieved while the sweep efficiency is improved, and the oil-water interfacial tension can be reduced, so that the cohesion among crude oil is overcome, the oil washing capacity is improved, and the oil displacement effect is greatly improved.
Disclosure of Invention
One of the technical problems to be solved by the invention is that the polymer in the compound flooding of the prior production technology is easy to cause stratum blockage and difficult to inject in a medium-low permeability reservoir, and the invention provides the oil displacement composition containing the sulfobetaine type surfactant, wherein the surfactant has the characteristics of ultralow interfacial tension, simple system and high oil displacement efficiency.
The second technical problem to be solved by the invention is to provide a preparation method of the oil-displacing surfactant composition corresponding to the first technical problem.
The invention aims to solve the third technical problem and provides an application of the oil displacement composition in oil displacement of oil fields, which corresponds to one of the technical problems.
In order to solve one of the above technical problems, the technical scheme adopted by the invention is as follows: an oil displacement composition comprises a betaine amphoteric surfactant and an inorganic salt; wherein the structure of the betaine amphoteric surfactant is shown as the formula (I):
in the formula (I), R1Is selected from C6～C29Any one of alkyl and alkenyl of (A), R2And R5Are all independently selected from C1～C22Any one of alkylene and hydroxy-substituted alkylene of (3), R3And R4Is selected from C1～C12Any one of alkylene and hydroxy-substituted alkylene of (2), wherein m + n is 0 to 100, and x + y is 0 to 100;
the inorganic salt is at least one of halide, carbonate, bicarbonate, sulfate, sulfite and nitrate; the molar ratio of the betaine amphoteric surfactant to the inorganic salt is 1: 0.01-1: 100.
in the technical scheme, R is preferably selected1Is C8～C25Any one of alkyl or alkenyl of (A), R2Is C2～C22Alkylene of (A), R5Is C1～C5Any one of alkylene or hydroxy-substituted alkylene of (A), R3And R4Is C1～C3M + n is 0 to 30, and x + y is 0 to 10.
From the viewpoint of improving the recovery ratio, the most preferable technical scheme is as follows: r1Is C12～C22Any one of alkyl or alkenyl of (A), R2Is C2～C9Alkylene of (A), R5Is C2～C3Any one of alkylene or hydroxy-substituted alkylene of (a); the inorganic salt is at least one selected from the group consisting of halides, carbonates, bicarbonates, sulfates, sulfites and nitrates of alkali metals and/or alkaline earth metals.
In the above technical solution, the inorganic salt is preferably selected from NaCl and MgCl2、CaCl2、Na2CO3、NaHCO3At least one kind of (B), or a combination of two or more kinds of (A).
In the above technical solution, the betaine amphoteric surfactant of formula (I) is preferably prepared by the following method:
r is to be1COOH or R1COOCH3Reacting with required amidation reagent at 100-160 ℃ for 3-20 hours; adding required amount of ethylene oxide and propylene oxide into the obtained intermediate, and reacting for 1-10 hours at 80-180 ℃ and 0-0.80 MPa (gauge pressure) to obtain alkyl polyoxyethylene ether; then adding a carboxylation reagent to continue reacting for 2-20 hours at 50-100 ℃ to obtain the long carbon chain betaine type amphiprotic of the formula (I)A surfactant; wherein R is1COOH or R1COOCH3: amidation reagent: the molar ratio of carboxylation reagent is 1: (1-3): (1-4).
In the above-mentioned embodiment, the molar ratio of the betaine amphoteric surfactant to the inorganic salt is preferably (1: 0.1) to (1: 10).
To solve the second technical problem, the invention adopts the following technical scheme: one of the above technical problems is a method for preparing a composition of an oil-displacing surfactant, comprising the steps of:
a) r is to be1COOH or R1COOCH3Reacting with required amidation reagent at 100-160 ℃ for 3-20 hours; adding required amount of ethylene oxide and propylene oxide into the obtained intermediate, and reacting for 1-10 hours at 80-180 ℃ and 0-0.80 MPa (gauge pressure) to obtain alkyl polyoxyethylene ether; then adding a carboxylation reagent or a sulfonation reagent to continue reacting for 2-20 hours at 50-100 ℃ to obtain the long-carbon-chain betaine surfactant shown in the formula (I); wherein, long carbon chain fatty acid methyl ester: amidation reagent: the molar ratio of the sulfonating agent is 1: (1-3): (1-4);
b) respectively dissolving an anionic surfactant and the amphoteric surfactant obtained according to the step a) in water, and then adding the anionic surfactant and the amphoteric surfactant to the water in a molar ratio of (1: 0.1) to (1: 10) and uniformly mixing to obtain the oil displacement composition.
In the above technical scheme, the preferable molecular general formula of the amidation reagent in the step a) is
The preferred range of the molar ratio of amphoteric surfactant to inorganic salt in step b) is (1: 0.1) to (1: 10).
The technical scheme adopted by the invention for solving the technical problem is as follows: an application of the oil displacement composition for solving one of the technical problems in oil displacement of oil fields.
The technical scheme adopted by the invention is as follows: in the above technical scheme, the application method is not particularly limited, and those skilled in the art can apply the oil-displacing composition of the present invention according to the existing process technology. For example, but not limited to, the reservoir temperature for the application is preferably 60-100 ℃. The oil displacement system has no special limitation on the permeability in an oil reservoir, and can achieve a good oil displacement effect, but the oil displacement system has outstanding technical difficulty in the field at medium and low permeability in the oil reservoir, and from the angle, the oil displacement system is particularly suitable for high-temperature medium and low-permeability oil reservoirs, for example, the oil reservoir temperature in the oil reservoir is 85 ℃, and the permeability is 30 millidarcy.
By adopting the technical scheme of the invention, the oil displacement composition has high interfacial activity: under the condition that the dosage is 0.01-0.6%, 10 can still be formed by the water with the mineralization degree of 30000mg/l and the content of calcium and magnesium ions of 400mg/l with underground crude oil-3～10-4Ultra-low interfacial tension of milli-newtons per meter; the oil washing capacity is strong; has the advantages of simple surfactant composition system and the like, and obtains better technical effect.
The invention is further illustrated by the following examples.
Detailed Description
[ example 1 ]
1. Surfactant preparation
(1) Hexadecanoic acid amide sulfobetaine surfactant (R)1＝C15,R2＝C2,R3\R4＝C2,R5＝C3H6O) preparation
a) Adding long carbon chain methyl palmitate and required amount of amidation reagent N, N-bis (2-hydroxyethyl) ethylenediamine into a reaction kettle, reacting for 6 hours at 130 ℃, starting a vacuum pump, pumping out excessive N, N-bis (2-hydroxyethyl) ethylenediamine, heating to 150 ℃ while introducing nitrogen into a reactor provided with a condensing device and a stirring device, heating for 40 minutes, adding ethylene oxide (2 mol), and stirring and reacting for 1 hour at 150 ℃. Cooling to 80 ℃, adding barium hydroxide as a catalyst, heating to 140 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, purging for 4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 165 ℃, slowly introducing ethylene oxide (4 moles), controlling the pressure to be less than 0.80MPa to carry out alkoxylation until the reaction is finished, purging the system by using nitrogen, cooling, neutralizing and dehydrating to obtain hexadecyl polyoxyalkene (m + n ═ 6) ether tertiary amine, adding required amount of 3-chloro-2-hydroxy sodium propane sulfonate, reacting for 12 hours at 85 ℃, recrystallizing and purifying by using absolute ethyl alcohol to obtain the long-carbon chain betaine amphoteric surfactant; wherein the molar ratio of the methyl palmitate to the N, N-bis (2-hydroxyethyl) ethylenediamine to the sodium 3-chloro-2-hydroxypropanesulfonate is 1:1.5: 1.6.
b) The prepared hexadecanoic acid amide carboxysulfobetaine amphoteric surfactant and inorganic salt NaCl in the molar ratio of 1:0.5 are uniformly mixed, dissolved in water and stirred for 30 minutes to prepare an aqueous solution, so that the oil-displacing surfactant composition is obtained.
2. Evaluation of surfactant Properties
a) Micelle size determination
The size of the formed micelle of the oil displacement agent at the above concentration of 0.3% was measured at 25 ℃ by using a Marvens dynamic light scattering particle size analyzer Nano ZS90, and the result is shown in Table 2.
b) Viscosity determination
Adopting a Brookfield DV-III viscometer at 85 deg.C and 7.34S-1The results of measuring the viscosity of the oil-displacing agent at the above concentration of 0.3% under the conditions are shown in Table 2.
c) Evaluation of interfacial tension
The results of measuring the interfacial tension between the oil-displacing agent of the above 0.1% concentration and the dehydrated crude oil at 85 ℃ and 6000 rpm using a TX-500C rotary drop interfacial tension apparatus manufactured by Texas university, USA, are shown in Table 2.
d) Evaluation of oil displacement experiment
According to the test of the physical simulated oil displacement effect of the composite oil displacement system in the SY/T6424-2000 composite oil displacement system performance test method, a simulated oil displacement experiment is carried out on a rock core with the length of 30cm, the diameter of 2.5cm and the permeability of 30 millidarcy at 87 ℃. Firstly, water flooding is carried out until the water content is 98%, after the water flooding is finished, the oil displacement agent with the concentration of 0.3% is injected by 0.3pv (core pore volume), then the water flooding is carried out until the water content is 100%, and the result of improving the crude oil recovery ratio is shown in table 2.
[ example 2 ]
1. Surfactant preparation
(1) Erucamide sulfobetaine surfactant (R)1＝C21,R2＝C2,R 3\R4＝C2,R5＝C2) Preparation of
a) Adding methyl erucate and required amount of amidation reagent N, N-bis (2-hydroxyethyl) ethylenediamine into a reaction kettle, reacting for 7 hours at 145 ℃, starting a vacuum pump, pumping out excessive N, N-bis (2-hydroxyethyl) ethylenediamine to obtain an erucyl tertiary amine product, heating to 150 ℃ while introducing nitrogen into a reactor provided with a condensing device and a stirring device, heating for 40 minutes, adding ethylene oxide (2 mol), and stirring and reacting for 1 hour at 150 ℃. Cooling to 80 ℃, adding barium hydroxide as a catalyst, heating to 140 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, purging for 4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 165 ℃, slowly introducing ethylene oxide (2 moles), controlling the pressure to be less than 0.80MPa to carry out alkoxylation until the reaction is finished, purging the system by using nitrogen, cooling, neutralizing and dehydrating to obtain docosylpolyoxyalkylene (m + n ═ 4) ether tertiary amine, adding required amount of 2-chloroethyl sodium sulfonate, reacting for 10 hours at 85 ℃, and recrystallizing and purifying by using absolute ethyl alcohol to obtain the long-carbon chain betaine surfactant; wherein the molar ratio of methyl erucate to N, N-bis (2-hydroxyethyl) ethylenediamine to 2-chloroethyl sodium sulfonate is 1:1.5: 1.5.
b) The erucamide sulfobetaine amphoteric surfactant prepared by the invention and inorganic salt MgCl2Uniformly mixing the components according to the molar ratio of 1:0.3, dissolving the components in water, stirring the mixture for 30 minutes, and preparing an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 3 ]
1. Surfactant preparation
(1) Triacontanoic acid amide sulfobetaine surfactant (R)1＝C29,R2＝C3,R 3\R4＝C2,R5＝C2) Preparation of
a) Adding long carbon chain methyl triacontanoate and required amount of amidation reagent N, N-bis (2-hydroxyethyl) propane diamine into a reaction kettle, reacting for 8 hours at 150 ℃, starting a vacuum pump, pumping out the excessive N, N-bis (2-hydroxyethyl) propane diamine to obtain a triacontanoic acyl tertiary amine product, heating to 150 ℃ while introducing nitrogen into a reactor provided with a condensing device and a stirring device, adding ethylene oxide (2 mol) after heating for 40 minutes, and stirring and reacting for 1 hour at 150 ℃. Cooling to 80 ℃, adding barium hydroxide as a catalyst, heating to 140 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, purging for 4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 165 ℃, slowly introducing ethylene oxide (2 moles) and propylene oxide (2 moles), controlling the pressure to be less than 0.80MPa to carry out alkoxylation until the reaction is finished, purging the system by using nitrogen, cooling, neutralizing and dehydrating to obtain triacontyl polyoxyalkene (m + n is 4, x + y is 2) ether tertiary amine, adding required amount of 2-chloroethyl sodium sulfonate, reacting for 16 hours at 85 ℃, and recrystallizing and purifying by using absolute ethyl alcohol to obtain the long-carbon chain betaine surfactant; wherein the molar ratio of methyl triacontanoate to N, N-bis (2-hydroxyethyl) propanediamine to 2-chloroethyl sodium sulfonate is 1:1.5: 1.6.
b) The triacontanoic acid amide sulfobetaine amphoteric surfactant prepared by the invention and CaCl2Uniformly mixing the components according to the molar ratio of 1:0.3, dissolving the components in water, stirring the mixture for 30 minutes, and preparing an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 4 ]
1. Surfactant preparation
(1) Pelargonic acid amide sulfobetaine surfactant (R)1＝C7,R2＝C2,R3\R4＝C2,R5＝C2) Preparation of
a) Adding methyl nonanoate and required amount of amidation reagent N, N-bis (2-hydroxyethyl) ethylenediamine into a reaction kettle, reacting for 8 hours at 150 ℃, starting a vacuum pump, pumping out the excessive N, N-bis (2-hydroxyethyl) ethylenediamine to obtain a nonanoic acid acyl tertiary amine product, heating to 150 ℃ while introducing nitrogen into a reactor provided with a condensing device and a stirring device, heating for 40 minutes, adding ethylene oxide (2 mol), and stirring and reacting for 1 hour at 150 ℃. Cooling to 80 ℃, adding barium hydroxide as a catalyst, heating to 140 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, purging for 4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 165 ℃, slowly introducing ethylene oxide (2 moles), controlling the pressure to be less than 0.80MPa to carry out alkoxylation until the reaction is finished, purging the system by using nitrogen, cooling, neutralizing and dehydrating to obtain nonyl polyoxy (m + n ═ 4) ether tertiary amine, adding required amount of 2-chloroethyl sodium sulfonate, reacting for 16 hours at 85 ℃, and recrystallizing and purifying by using absolute ethyl alcohol to obtain the long-carbon chain betaine surfactant; wherein the molar ratio of the methyl nonanoate to the N, N-bis (2-hydroxyethyl) ethylenediamine to the sodium 2-chloroethyl sulfonate is 1:1.5: 1.6.
b) Mixing pelargonic acid amide sulfobetaine surfactant and inorganic salt NaHCO3Uniformly mixing the components according to the molar ratio of 1:0.5, dissolving the components in water, stirring the mixture for 30 minutes, and preparing an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 5 ]
1. Surfactant preparation
(1) Octadecanoic acid amide sulfobetaine surfactant (R)1＝C17,R2＝C2,R3\R4＝C2,R5＝C3H6O) preparation
a) Adding methyl octadecanoate and required amount of amidation reagent N, N-bis (2-hydroxyethyl) ethylenediamine into a reaction kettle, reacting for 8 hours at 150 ℃, starting a vacuum pump, pumping out the excessive N, N-bis (2-hydroxyethyl) ethylenediamine to obtain a nonanoic acid acyl tertiary amine product, heating to 150 ℃ while introducing nitrogen into a reactor provided with a condensing device and a stirring device, heating for 40 minutes, adding ethylene oxide (2 mol), and stirring and reacting for 1 hour at 150 ℃. Cooling to 80 ℃, adding barium hydroxide as a catalyst, heating to 140 ℃, starting a vacuum system, dehydrating for 1 hour under high vacuum, purging for 4 times by using nitrogen to remove air in the system, adjusting the reaction temperature of the system to 165 ℃, slowly introducing ethylene oxide (4 moles), controlling the pressure to be less than 0.80MPa to carry out alkoxylation until the reaction is finished, purging the system by using nitrogen, cooling, neutralizing and dehydrating to obtain octadecyl polyoxy alkene (m + n ═ 6) ether tertiary amine, adding required amount of 3-chloro-2-hydroxy sodium propane sulfonate, reacting for 16 hours at 85 ℃, recrystallizing and purifying by using absolute ethyl alcohol to obtain the long-carbon chain betaine surfactant; wherein the molar ratio of the methyl nonanoate to the N, N-bis (2-hydroxyethyl) ethylenediamine to the sodium 3-chloro-2-hydroxypropanesulfonate is 1:1.5: 1.6.
b) Mixing the octadecanoic acid amide sulfobetaine surfactant and the inorganic salt NaCl in a molar ratio of 1:0.5 uniformly, dissolving the mixture in water, stirring the mixture for 30 minutes, and preparing an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 1 ]
1. Surfactant preparation
According to the method described in patent CN 201410037604.3, a surfactant of the following structure was synthesized: synthesized surfactant C21H43N(CH3)2-C3H6SO3Mixing with inorganic salt NaCl at a molar ratio of 1:0.5, dissolving in water, stirring for 30 min, and making into water solution to obtain oil-displacing surfactantA combination of agents.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 2 ]
1. Surfactant preparation
According to the method described in patent CN103242816B, a surfactant of the following structure was synthesized: c11H23CON(CH2CH2OH)2Uniformly mixing the synthesized surfactant and inorganic salt NaCl in a molar ratio of 1:0.5, dissolving in water, stirring for 30 minutes, and preparing into an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 3 ]
1. Surfactant preparation
According to the method described in patent CN102276822A, a surfactant of the following structure was synthesized:
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 4 ]
1. Surfactant preparation
Dissolving the triacontanoic acid amide sulfobetaine amphoteric surfactant in the embodiment 3 in water, stirring for 30 minutes, and preparing into an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 5 ]
1. Surfactant preparation
Betaine amphoteric surfactant was prepared according to example 3 except that alkoxylation was not performed to prepare triacontanoimide sulfobetaine amphoteric surfactant, and the prepared triacontanoimide sulfobetaine amphoteric surfactant was mixed with CaCl2Uniformly mixing the components according to the molar ratio of 1:0.3, dissolving the components in water, stirring the mixture for 30 minutes, and preparing an aqueous solution to obtain the oil-displacing surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
TABLE 1 compositions of surfactant compositions in examples and comparative examples
TABLE 2 evaluation of oil-displacing agent Performance in examples and comparative examples
| Particle diameter (nm) | Viscosity (mPa.s) | Interfacial tension (mN/m) | Enhanced recovery ratio% | |
| Example 1 | 120 | 15.4 | 0.0075 | 12.0 |
| Example 2 | 117 | 15.2 | 0.0060 | 11.5 |
| Example 3 | 136 | 15.9 | 0.0041 | 12.0 |
| Example 4 | 109 | 14.9 | 0.0086 | 10.8 |
| Example 5 | 122 | 17.6 | 0.0033 | 13.0 |
| Comparative example 1 | 85 | 5.8 | 0.0090 | 6.2 |
| Comparative example 2 | 56 | 4.6 | 0.0171 | 6.3 |
| Comparative example 3 | 85 | 5.3 | 0.0085 | 7.1 |
| Comparative example 4 | 87 | 8.9 | 0.0073 | 9.2 |
| Comparative example 5 | 58 | 5.6 | 0.0092 | 6.0 |
Claims (10)
1. An oil displacing composition comprising a sulfobetaine surfactant, comprising a betaine amphoteric surfactant and an inorganic salt; wherein the structure of the betaine amphoteric surfactant is shown as the formula (I):
in the formula (I), R1Is selected from C6～C29Any one of alkyl and alkenyl of (A), R2And R5Are all independently selected from C1～C22Any one of alkylene and hydroxy-substituted alkylene of (3), R3And R4Is selected from C1～C12Any one of alkylene and hydroxy-substituted alkylene of (2), wherein m + n is 0 to 100, and x + y is 0 to 100;
the inorganic salt is at least one of halide, carbonate, bicarbonate, sulfate, sulfite and nitrate; the molar ratio of the betaine amphoteric surfactant to the inorganic salt is 1: 0.01-1: 100.
2. the flooding composition of claim 1, wherein the amphoteric surfactant comprises R1Is C8～C25Any one of alkyl or alkenyl of (A), R2Is C2～C22Alkylene of (A), R5Is C1～C5Any one of alkylene or hydroxy-substituted alkylene of (A), R3And R4Is C1～C3M + n is 0 to 30, and x + y is 0 to 10.
3. The flooding composition of claim 2, wherein the amphoteric surfactant comprises R1Is C12～C22Any one of alkyl or alkenyl of (A), R2Is C2～C9Alkylene of (A), R5Is C1～C3Any one of alkylene or hydroxy-substituted alkylene of (1).
4. The flooding composition of claim 1, wherein the inorganic salt is selected from at least one of halides, carbonates, bicarbonates, sulfates, sulfites, and nitrates of alkali and/or alkaline earth metals.
5. The flooding composition of claim 4, wherein the inorganic salt is selected from the group consisting of NaCl, MgCl2、CaCl2、Na2CO3、NaHCO3At least one kind of (B), or a combination of two or more kinds of (A).
6. The flooding composition of any one of claims 1-5, characterized in that the betaine-type amphoteric surfactant of formula (I) is prepared by:
r is to be1COOH or R1COOCH3Reacting with required amidation reagent at 100-160 ℃ for 3-20 hours; adding required amount of ethylene oxide and propylene oxide into the obtained intermediate, and reacting for 1-10 hours at the temperature of 80-180 ℃ and the gauge pressure of 0-0.80 MPa to obtain alkyl polyoxylene ether; then adding a sulfonation reagent to continue reacting for 2-20 hours at 50-100 ℃ to obtain the betaine amphoteric surfactant shown in the formula (I); wherein R is1COOH or R1COOCH3: amidation reagent: the molar ratio of the sulfonating agent is 1: 1-3: 1 to 4.
7. The flooding composition of claim 6, wherein the amidation agent has the general molecular formula
8. The flooding composition of claim 1, wherein the betaine-type amphoteric surfactant and inorganic salt are present in a molar ratio of 1: 0.1-1: 10.
9. the method of preparing the flooding composition of any one of claims 1 to 8, comprising the steps of:
a) r is to be1COOH or R1COOCH3Reacting with required amidation reagent at 100-160 ℃ for 3-20 hours; adding the required amount of ethylene oxide and propylene oxide into the obtained intermediateAt 80-180 ℃, the gauge pressure is 0-0.80 MPa, and the reaction time is 1-10 hours to obtain the alkyl polyoxyethylene ether; then adding a sulfonation reagent to continue reacting for 2-20 hours at 50-100 ℃ to obtain the betaine amphoteric surfactant shown in the formula (I); wherein R is1COOH or R1COOCH3: amidation reagent: the molar ratio of the sulfonating agent is 1: 1-3: 1-4;
b) respectively dissolving inorganic salt and the betaine amphoteric surfactant obtained according to the step a) into water, wherein the molar ratio of the betaine amphoteric surfactant to the inorganic salt is 1: 0.1-1: 10, and mixing uniformly to obtain the oil displacement composition containing the sulfobetaine type surfactant.
10. Use of a flooding composition comprising a sulphobetaine surfactant according to any one of claims 1 to 8 in oil field flooding.
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