CN116554848A - Surfactant composition for oil displacement - Google Patents
Surfactant composition for oil displacement Download PDFInfo
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- CN116554848A CN116554848A CN202210103453.1A CN202210103453A CN116554848A CN 116554848 A CN116554848 A CN 116554848A CN 202210103453 A CN202210103453 A CN 202210103453A CN 116554848 A CN116554848 A CN 116554848A
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- 239000004094 surface-active agent Substances 0.000 title claims abstract description 96
- 239000000203 mixture Substances 0.000 title claims abstract description 83
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 80
- -1 alkyl diphenyl ether Chemical compound 0.000 claims abstract description 42
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 19
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Natural products C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 15
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 9
- 239000012188 paraffin wax Substances 0.000 claims description 9
- 239000002738 chelating agent Substances 0.000 claims description 8
- 229920003169 water-soluble polymer Polymers 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 7
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 claims description 6
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims description 3
- 229960003330 pentetic acid Drugs 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 150000004985 diamines Chemical class 0.000 claims description 2
- 239000012991 xanthate Substances 0.000 claims description 2
- 125000003342 alkenyl group Chemical group 0.000 claims 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 77
- 239000004530 micro-emulsion Substances 0.000 abstract description 34
- 238000000034 method Methods 0.000 abstract description 19
- 239000012267 brine Substances 0.000 abstract description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 128
- 235000019198 oils Nutrition 0.000 description 128
- 239000012071 phase Substances 0.000 description 121
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 52
- 239000010779 crude oil Substances 0.000 description 33
- 238000011084 recovery Methods 0.000 description 27
- 229910000029 sodium carbonate Inorganic materials 0.000 description 26
- 238000011549 displacement method Methods 0.000 description 16
- 230000035699 permeability Effects 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 239000003795 chemical substances by application Substances 0.000 description 13
- 229920000642 polymer Polymers 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 9
- 229910052708 sodium Inorganic materials 0.000 description 9
- 239000011734 sodium Substances 0.000 description 9
- 241000237858 Gastropoda Species 0.000 description 8
- 229960001484 edetic acid Drugs 0.000 description 8
- 238000005063 solubilization Methods 0.000 description 7
- 230000007928 solubilization Effects 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000008346 aqueous phase Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000008398 formation water Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 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 3
- LGNQGTFARHLQFB-UHFFFAOYSA-N 1-dodecyl-2-phenoxybenzene Chemical compound CCCCCCCCCCCCC1=CC=CC=C1OC1=CC=CC=C1 LGNQGTFARHLQFB-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 125000005037 alkyl phenyl group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000010290 biphenyl Nutrition 0.000 description 2
- 239000004305 biphenyl Substances 0.000 description 2
- 125000006267 biphenyl group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- MXXDSLLVYZMTFA-UHFFFAOYSA-N octadecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 MXXDSLLVYZMTFA-UHFFFAOYSA-N 0.000 description 2
- 235000019476 oil-water mixture Nutrition 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 230000003381 solubilizing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- QKIAYRRGJHLRAQ-UHFFFAOYSA-N hexadecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 QKIAYRRGJHLRAQ-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- GYVKLDBUSXDBPV-UHFFFAOYSA-N octadec-1-ene-1-sulfonic acid Chemical compound CCCCCCCCCCCCCCCCC=CS(O)(=O)=O GYVKLDBUSXDBPV-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- HEBRGEBJCIKEKX-UHFFFAOYSA-M sodium;2-hexadecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HEBRGEBJCIKEKX-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000001550 testis Anatomy 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention provides a surfactant composition for oil displacement, which comprises a monosulfonate surfactant and alkyl diphenyl ether disulfonate. Can form a three-phase balance system of medium-phase microemulsion, oil phase and brine phase, and has ultralow oil-water interfacial tension. The method is suitable for displacement of the underground oil reservoir with medium and high temperature, medium and high acid value and high mineralization degree, and effectively improves the oil displacement rate of the oil reservoir.
Description
Technical Field
The invention belongs to the technical field of oil displacement agents in oilfield chemicals, and particularly relates to an oil displacement surfactant composition.
Background
Along with the extension of development time, most of domestic oil fields enter the later development stage, the water flooding control program is low, and 50% or more of residual oil is left in the oil reservoir after water flooding, so that the secondary or tertiary oil recovery technology is widely paid attention to.
The surfactant oil displacement agent is injected into the stratum to displace oil, so that the oil displacement rate is improved, and the method is one of the most promising enhanced oil recovery EOR technologies. The phase of surfactant injection is commonly referred to as surfactant slugs. If the surfactant or combination of surfactants is selected to be suitable for a particular oil in the reservoir, and the crude oil viscosity is not too high, the reservoir temperature is suitable, and the reservoir has a matched porosity, permeability, and wettability, the injection of the surfactant can greatly increase the crude oil production.
In most cases, polymers are also included in the formulation. The polymer is also typically used as a slug and the surfactant-containing solution system in the reservoir may be advanced. In surfactant-polymer systems, the main role of the polymer is to increase the viscosity of the surfactant slugs and to provide fluidity control, thereby increasing the swept volume of the displacement slugs in the target reservoir, which is critical to enhanced recovery. Thus, the polymer slugs that drive the surfactant slugs typically have a higher viscosity than the surfactant slugs. Typically, the polymer used in the polymer slugs is the same type of polymer as in the surfactant slugs, but at a higher concentration.
It is well known that most reservoirs require 10 -3 An interfacial tension value of mN/m or even lower can displace crude oil from narrow pores. The tension values required are extremely low and not readily available, and in particular the surfactants used are also limited in some other ways: must perform well at reservoir temperatures; excessive adsorption on reservoir rock is not necessary; during displacement (which may be as long as months or even years) it must be resistant to chemical corrosion and microbial degradation; they must be low toxic to humans and environmentally friendly.
At present, the performance of the oil displacement surfactant is still to be improved in the oil layer with medium and high temperature, high mineralization degree and high acid value, and the characteristics of the oil displacement surfactant on specific oil layers are needed, so that the surfactant oil displacement agent is developed specifically to meet the use requirements of actual displacement.
Disclosure of Invention
In order to solve the problems, the invention provides an oil displacement surfactant composition which is suitable for oil reservoir reservoirs with medium and high temperature (45-75 ℃) and high mineralization degree (total salinity is 15-50 g/L) and medium and high acid value (acid value is 1.0-3.0 mgKOH/g), can reach ultralow oil-water interfacial tension, can keep a medium-phase microemulsion state with an oil layer for a long time, and greatly improves the oil displacement rate, thereby completing the invention.
The invention aims to provide a surfactant composition for oil displacement, which comprises monosulfonate surfactant and alkyl diphenyl ether disulfonate.
The monosulfonate surfactant is selected from one or more of alkylphenyl sulfonate, alkyl naphthalene sulfonate, olefin sulfonate and paraffin sulfonate, and is preferably alkylphenyl sulfonate.
The alkyl diphenyl ether disulfonate has an alkyl carbon number of from 12 to 20, preferably from 12 to 18, more preferably from 12 to 16.
Preferably, the surfactant composition for displacement of reservoir oil further comprises a water-soluble polymer and/or a chelating agent, preferably further comprises an alkaline substance.
In a preferred embodiment of the present invention, the surfactant composition for displacement of reservoir oil further comprises an alcohol, preferably an alcohol having a carbon content of 2 to 10, more preferably one or more of isopropanol, isobutanol and isoamyl alcohol.
The invention also aims to provide the application of the surfactant composition for oil displacement, preferably for displacing a medium-high temperature and high mineralization oil reservoir.
The oil reservoir temperature is 35-85 ℃, preferably 45-75 ℃, and the oil reservoir mineralization is 5-70 g/L, preferably 10-50 g/L.
The acid value of the reservoir is 0.5 to 5.0mgKOH/g, preferably 1.0 to 4.0mgKOH/g, more preferably 1.0 to 3.0mgKOH/g.
The surfactant composition for oil displacement provided by the invention has the following beneficial effects:
(1) The composition formed by the more hydrophobic sodium sulfonate type surfactant and the more hydrophilic alkyl sodium diphenyl sulfonate type surfactant can synergistically increase the efficiency, and form a stable three-phase balance system of phase microemulsion, oil phase and brine phase with an oil displacement system, so that effective oil displacement is realized, and the oil displacement rate is greatly improved.
(2) The surfactant composition for oil displacement provided by the invention further comprises a chelating agent and a water-soluble polymer, so that the viscosity of the surfactant composition can be effectively improved, the influence of divalent ions in an oil displacement system is weakened, and the oil displacement effect is improved.
(3) The surfactant composition for oil displacement provided by the invention is added with the short-chain alcohol to improve the solubility and the dispersibility of the surfactant, so that each component of the surfactant can form a uniform system with crude oil, and the situation of weakening of local oil displacement effect is avoided.
(4) The surfactant composition for oil displacement provided by the invention is convenient to use, is beneficial to use in an oil displacement site, and is convenient to popularize and apply.
Drawings
FIG. 1 is a graph showing the interfacial tension test of the surfactant composition obtained in example 1 of the present invention in a crude oil system;
FIG. 2 shows a test chart of a mesophase microemulsion formed between crude oil and water of a surfactant composition of example 1 of the present invention;
FIG. 3 shows a graph of a flooding test conducted using a manual Bei Leiyan core in example 1 of the present invention;
FIG. 4 is a graph showing the interfacial tension test of the surfactant composition obtained in example 2 of the present invention in a crude oil system;
FIG. 5 shows a graph of a flooding test conducted using a manual Bei Leiyan core in example 2 of the present invention;
FIG. 6 is a graph showing the interfacial tension test of the surfactant composition obtained in example 3 of the present invention in a crude oil system;
FIG. 7 is a graph showing the interfacial tension test of the surfactant composition obtained in example 4 of the present invention in a crude oil system;
FIG. 8 is a graph showing the interfacial tension test of the surfactant composition obtained in example 5 of the present invention in a crude oil system;
FIG. 9 is a graph showing the interfacial tension test of the surfactant composition obtained in example 6 of the present invention in a crude oil system.
Detailed Description
The features and advantages of the present invention will become more apparent and evident from the following detailed description of the invention.
The invention provides a driveThe surfactant composition for oil can be suitable for displacement of oil reservoirs with medium and high temperature and high mineralization degree, greatly improves the oil displacement rate, has green and environment-friendly components, does not cause stratum pollution, and has the surfactant of 10 -3 mN/m, even 10 -4 And the oil displacement property is effectively improved under mN/m.
The invention provides a surfactant composition for oil displacement, which comprises monosulfonate surfactant and alkyl diphenyl ether disulfonate.
The monosulfonate surfactant is selected from one or more of alkylphenyl sulfonate, alkyl naphthalene sulfonate, olefin sulfonate and paraffin sulfonate, and is preferably alkylphenyl sulfonate. The alkyl, olefin, paraffin hydrocarbon number in the alkyl phenyl sulfonate, alkyl naphthalene sulfonate, olefin sulfonate, paraffin sulfonate is 8-26, preferably 10-24, more preferably 12-22. The preferred monosulfonate surfactants in the surfactant composition for displacement have relatively high lipophilicity, and have a hydrophilic-lipophilic value (HLB value) of between 3 and 8.
In a preferred embodiment of the present invention, the alkyl phenyl sulfonate has an alkyl carbon number of 12 to 22, preferably 14 to 20, more preferably 16 to 18. The alkyl naphthalene radical xanthate has an alkyl carbon number of from 14 to 22, preferably from 16 to 20, more preferably 16. The olefin sulfonate has an olefin group carbon number of 12 to 20, preferably 14 to 18, more preferably 16. The paraffin sulfonate has an average carbon number of 12 to 20, preferably 14 to 18, more preferably 18. The amount of carbon in the sulfonate surfactant directly affects the hydrophilic-lipophilic properties of the oil-displacing composition, and the above-mentioned carbon amount is preferably selected so that the HLB value of the above-mentioned alkylphenyl sulfonate falls between 3 and 8.
The alkyl diphenyl ether disulfonate has an alkyl carbon number of from 12 to 20, preferably from 12 to 18, more preferably from 12 to 16. The alkyl diphenyl oxide disulfonate is the more hydrophilic component of the surfactant composition for displacement of oil and has an HLB value of between 9 and 14, and the carbon-containing amount of the alkyl diphenyl oxide disulfonate is preferably such that it has an HLB value.
Through a plurality of experiments, it is found that the water is hydrophobicThe combination of two agents of a (lipophilic) sodium monosulphonate type surfactant and a more hydrophilic sodium alkylbenzensulphonate type surfactant can provide the desired three-phase system, i.e. a medium phase microemulsion, an oil phase and a salt water phase, achieving a three-phase equilibrium and having an ultra-low oil-water interfacial tension. This is because the combination of the relatively lipophilic monosulfonate surfactant and the relatively hydrophilic alkyl diphenyl ether disulfonate can result in a displacement composition that is both hydrophilic and lipophilic. When exposed to petroleum and water in a subterranean reservoir, a stable hydrophilic lipophilic mesophase microemulsion layer can be formed. The hydrophilic and lipophilic performance of the oil displacement composition consisting of the anionic surfactant can be regulated and controlled to a certain extent by the salinity of the aqueous solution. At the optimal salinity, the interfacial tension of the two systems, namely the interfacial tension of oil and microemulsion and the interfacial tension of microemulsion and brine are equal and are both 10 -3 mN/m or less. A thermodynamically stable intermediate phase is formed between the oil and water. Unlike w/o and w/o microemulsions, microemulsions in the intermediate phase state are bicontinuous phases in which the oil phase and the water phase are mutually fused together. The phase state is favorable for the rapid diffusion of the oil displacement agent component in an oil-water system.
In a preferred embodiment of the present invention, the monosulfonate surfactant is an alkylphenyl sulfonate having an alkyl carbon number of 16 to 18; in the alkyl diphenyl ether disulfonate, the carbon content of the alkyl is 12-16. The alkylbenzene sulfonate and alkyldiphenyloxide disulfonate compositions within the above alkyl carbon content readily achieve ultra-low level interfacial tension (less than 10) with the target reservoir near optimum salinity -3 mN/m) and forms an intermediate phase.
The mass ratio of the monosulfonate surfactant to the alkyl diphenyl ether disulfonate is (0.2-4.5): 1, preferably (0.3-3.5): 1, and more preferably (0.4-2.5): 1. Because the solubility of the two surfactants in different salinity brines is different, the mass ratio of the two surfactants needs to be adjusted according to the salinity of the target reservoir water. Thus, the compounded oil displacement agent composition system is clear and transparent, and does not generate turbidity.
When used, the mass concentration of both the monosulphonate surfactant and the alkyl diphenyl ether disulfonate is from 0.1% to 0.6%, preferably from 0.15% to 0.5%, more preferably from 0.2% to 0.4%, such as 0.3%.
Preferably, the surfactant composition for displacement of reservoir oil further comprises a water-soluble polymer and/or a chelating agent, preferably further comprises an alkaline substance.
The water-soluble polymer is selected from one or more of polyacrylamide, partially hydrolyzed polyacrylamide, xanthan gum and a copolymer of acrylamide and acrylic acid, preferably one or more of polyacrylamide, partially hydrolyzed polyacrylamide and xanthan gum, more preferably polyacrylamide and/or partially hydrolyzed polyacrylamide.
The water-soluble polymer has an average number average molecular weight of 1800-2800 kilodaltons, preferably 2000-2600 kilodaltons, more preferably 2200-2500 kilodaltons.
The ratio of the water-soluble polymer to the mass sum of both the monosulphonate surfactant and the alkyl diphenyl ether disulphonate is (0.1-0.5) 0.3, preferably (0.15-0.4) 0.3, more preferably (0.2-0.3) 0.3.
The chelating agent is selected from organic amines, preferably from organic diamines or organic triamines, more preferably ethylenediamine tetraacetic acid (EDTA) or diethylenetriamine pentaacetic acid (DTPA). The ratio of the chelating agent to the sum of the mass of both the monosulphonate surfactant and the alkyl diphenyl ether disulphonate is (0.2-2) 0.3, preferably (0.6-1.6) 0.3, more preferably (1.0-1.2) 0.3. The chelating agent is added into the oil displacement agent composition to chelate divalent metal ions in the stratum oil reservoir, so that the high viscosity of the oil displacement system is maintained and the stratum water does not generate excessive precipitation.
The alkaline substance is selected from one or more of carbonate, bicarbonate and alkali metal hydroxide, preferably carbonate or bicarbonate. After the alkaline substance is added, the alkaline substance is combined with high acid value substances in the oil reservoir, so that the interfacial tension of the surfactant combination can be greatly improved. The mass sum ratio of the basic substance to both the monosulfonate surfactant and the alkyl diphenyl ether disulfonate is (0.8-3) 0.3, preferably (1-2.5) 0.3, more preferably (1.5-2.5) 0.3.
In a preferred embodiment of the present invention, the surfactant composition for displacement of reservoir oil further comprises an alcohol, preferably an alcohol having a carbon content of 2 to 10, more preferably one or more of isopropanol, isobutanol and isoamyl alcohol. The addition of the alcohol improves the solubility of the surfactant in the system, so that the surfactant is easier to disperse uniformly. However, the addition of an excess of short-chain alcohol has a certain adverse effect on the medium-phase microemulsion system. And thus needs to be within a certain range.
The mass sum ratio of the alcohol substance to both the monosulfonate surfactant and the alkyl diphenyl ether disulfonate is (0.5-4.5) 0.3, preferably (1-3.5) 0.3, more preferably (1.5-2.5) 0.3.
The invention also provides application of the surfactant composition for oil displacement, and the surfactant composition is preferably used for displacing medium-high temperature and high mineralization oil reservoirs.
The oil reservoir temperature is 35-85 ℃, preferably 45-75 ℃, and the oil reservoir mineralization is 10-70 g/L, preferably 15-50 g/L.
The acid value of the reservoir is 1.0 to 3.0mgKOH/g, preferably 1.0 to 3.0mgKOH/g, more preferably 1.0 to 3.0mgKOH/g.
The surfactant composition for oil displacement provided by the invention is convenient to use, and can form three-phase balance of medium-phase microemulsion, oil phase and salt water phase by the composition of the more hydrophobic sodium sulfonate surfactant and the more hydrophilic sodium alkyl diphenyl sulfonate surfactant, and the interfacial tension of oil and microemulsion and the interfacial tension of microemulsion and salt water can reach ultra-low interfacial tension. The method is suitable for displacement of the oil deposit with the mineralization degree of 10-70 g/L at the temperature of 35-85 ℃ and effectively improves the oil displacement rate of the oil deposit.
Examples
Example 1
(1) Sodium stearyl benzene sulfonate and disodium dodecyl diphenyl ether disulfonate are mixed according to the mass ratio of 70:30, and the mixture is added into a mixture of crude oil and water, wherein the mass ratio of the crude oil to the water is 1:1. The crude oil used had an underground viscosity of 50 mPas, an acid value of 2.0mgKOH/g and a total formation water mineralization of 23g/L at 60 ℃. The mass fraction of the total amount of the surfactant is 0.3%. The water is prepared by adding sodium carbonate into stratum water, wherein the mass fraction of the added sodium carbonate is 0.8-3%.
The mixture was stirred and allowed to stand to equilibrate, yielding a three-phase system with a mesophase microemulsion. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
And determining the influence of the oil displacement agent compositions with different concentrations on the interfacial tension between oil-water phases by adopting a common rotary drop interfacial tension method. The results are shown in FIG. 1. As can be seen from FIG. 1, in this example, the mass fraction of sodium carbonate is 1.4wt% to 1.8wt%, and the interfacial tension is 10 -4 On the order of mN/m.
As shown in fig. 2, a 2 ml test tube is used, and the mass ratio of the crude oil to the aqueous solution containing the oil-displacing agent composition is 1:1, fully mixing the components at the temperature of 60 ℃ of the underground oil reservoir, wherein the concentration of sodium carbonate in the oil displacement agent-containing composition is 0.8%, 1.2%, 1.6%, 2.0%, 2.4%, 2.8% and 3.2% from left to right. After mixing, standing vertically for 48 hours, and obtaining obvious phase state of the medium-phase microemulsion at 1.6% -2.4%.
Meanwhile, the oil-water solubilization index was calculated using the following formulas (1) and (2), and the interfacial tension was calculated by Huh equations (3) and (4):
wherein sigma o Is an oil solubilization index; sigma (sigma) w Is a water solubilization index; v (V) o Is the oil solubilizing volume (ml); v (V) w Is a water solubilizing volume (ml); v (V) s Is surfactant volume (ml); c is a constant of 0.3; gamma ray OM Interfacial tension (mN/m) between the intermediate phase and the oil phase; gamma ray WM Is the interfacial tension between the medium phase and the water phase (mN/m).
As can be seen from formulas (1) and (2), the solubilization ratio of oil and water in the microemulsion phase is in excess of 25. The interfacial tension between the intermediate phase and the oil phase and between the intermediate phase and the water phase reach 10 according to the calculation formulas (3) and (4) -4 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to reservoir cores, specifically cores of 3.8cm diameter and 30.5cm length, with water phase permeability of 400-600 millidarcies and porosity of 22%.
For the Berea sandstone core, the saturated crude oil is injected first, and then water flooding is performed until the water content of the produced fluid is close to 100%. Then a 0.30PV alkali-surfactant-polymer composite slug (alkali sodium carbonate, concentration of 1.1wt%, surfactant combination concentration of 0.3wt%, polymer of partially hydrolyzed polyacrylamide (Noll chemical industry, salt-resistant polymer, average molecular weight 2500 kilodaltons), concentration of 0.24wt%, viscosity of 45 cp) and a 0.2PV polymer slug (hydrolyzed polyacrylamide, concentration of 0.25%, viscosity of 50 cp) were sequentially injected into the porous medium, and then oilfield sewage was injected until the oil production water contained 100%. Wherein, water flooding results are adopted as comparison. As particularly shown in fig. 3. Along with the increase of the injection quantity of the oil displacement agent composition slug, the circular curve shows the gradual increase of the accumulated petroleum extraction rate, the square curve shows the gradual decrease of the saturation of the residual crude oil of the underground oil reservoir, and the triangular curve shows the highest oil content of the produced liquid under the injection volume (PV) of 3-4.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 93% OOIP, and compared with the recovery ratio of 45% OOIP of the method only adopting water displacement, the oil displacement method improves the recovery ratio of 48% OOIP.
Example 2
(1) Sodium cetyl benzene sulfonate and disodium cetyl diphenyl ether disulfonate were mixed in a mass ratio of 60 to 40 and the mixture was added to a crude oil and water mixture mixed in a mass ratio of 50 to 50, and the mixture contained EDTA in an amount of 1% by mass and 0.24% partially hydrolyzed polyacrylamide having an average molecular weight of about 1600 kilodaltons. The crude oil used had a subsurface viscosity of 60 mPas, an acid number of 1.8mg KOH/g and a total formation water mineralization of 27g/L at 50 ℃. The mass fraction of the total amount of the surfactant is 0.3%. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, and a three-phase system appears. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
The interfacial tension of the oil phase and the microemulsion phase and the aqueous phase was determined by the usual rotary drop interfacial tension method. When the mass fraction of the sodium carbonate is 1.2-2.0%, the interfacial tension of the two is 10 -3 The results are shown in FIG. 4, which shows mN/m or less. As can be seen from FIG. 4, in the present embodiment, the mass fraction of sodium carbonate is 1.4% -1.8%, and the interfacial tension is 10 -4 ～10 -5 mN/m magnitude order, and the interfacial tension value obtained by the phase behavior test is matched.
Meanwhile, evaluation was carried out by a medium-phase microemulsion phase experiment, and the solubilization ratio of oil and water in the microemulsion phase was more than 25 as obtained by using the calculation formulas (1) and (2) in example 1. By adopting the calculation formulas (3) and (4) in the embodiment 1, the interfacial tension between the intermediate phase and the oil phase as well as between the intermediate phase and the water phase reaches 10 -4 ～10 -5 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 96% of OOIP, and compared with the recovery ratio of 48% of OOIP of the method adopting only water displacement, the oil displacement method improves the recovery ratio of 48% of OOIP, and particularly as shown in figure 5, each curve has the same meaning as that of figure 3 in the example 1.
Example 3
(1) Sodium stearyl benzene sulfonate and disodium dodecyl diphenyl ether disulfonate are mixed according to the mass ratio of 50 to 50, and the mixture is added into the mixture of crude oil and water mixed according to the mass ratio of 50 to 50, and the mixture contains EDTA and isopropanol with the mass fraction of 1 percent and 2 percent. At 45℃the crude oil used had an underground viscosity of 40 mPas, an acid value of 2.2mgKOH/g and a total degree of mineralization of 35g/L. The mass fraction of the total amount of the surfactant is 0.3%. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, and a three-phase system appears. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
The interfacial tension of the oil phase and the microemulsion phase and the aqueous phase was measured by the conventional spin drop method. When the mass fraction of the sodium carbonate is 1.0-2.4%, the interfacial tension of the two is 10 -3 The results are shown in FIG. 6, which shows mN/m or less. As can be seen from FIG. 6, in the present embodiment, the interfacial tension reaches 10 when the mass fraction of sodium carbonate is 1.6% to 2.0% -4 And mN/m or less, and is matched with the interfacial tension value calculated by the phase behavior test.
Meanwhile, by experiments of phase evaluation of the medium-phase microemulsion, the solubilization ratio of oil and water in the microemulsion phase is more than 25 as obtained by adopting the calculation formulas (1) and (2) in the embodiment 1. When the mass fraction of sodium carbonate is 1.6% -2.0% obtained by adopting the calculation formulas (3) and (4) in the embodiment 1, the boundary between the intermediate phase and the oil phase as well as between the intermediate phase and the water phaseThe surface tension is 10 -4 ～10 - 5 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 95% OOIP, and compared with the recovery ratio of 44% OOIP of the method only adopting water displacement, the oil displacement method improves the recovery ratio of 41% OOIP.
Example 4
(1) Sodium alpha-octadecenyl sulfonate and hexadecyl diphenyl oxide disulfonate are mixed according to the mass ratio of 60 to 40, and the mixture is added into the mixture of crude oil and water mixed according to the mass ratio of 50 to 50, and the mixture contains 1 percent of Ethylene Diamine Tetraacetic Acid (EDTA) and 2.5 percent of isopropanol according to the mass ratio. At 60℃the crude oil used had an underground viscosity of 47 mPas, an acid value of 2.1mgKOH/g and a total formation water mineralization of 43g/L. The mass fraction of the total amount of the surfactant is 0.3%. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, and a three-phase system appears. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
The interfacial tension of the oil phase and the microemulsion phase and the aqueous phase was measured by the conventional spin drop method. When the mass fraction of the sodium carbonate is 1.4-2.2%, the interfacial tension of the two is 10 -3 The results are shown in FIG. 7, which shows mN/m or less. As can be seen from FIG. 7, in the present embodiment, the interfacial tension reaches 10 when the mass fraction of sodium carbonate is 1.6% to 2.0% -4 mN/m order of magnitude or below, and the interfacial tension value calculated by the phase behavior test is matched with the interfacial tension value calculated by the phase behavior test.
Meanwhile, the calculation formula in the example 1 is adopted to obtain the microemulsionThe solubilization ratio of oil and water in the phases is more than 25, and when the mass fraction of sodium carbonate is 1.6% -2.0%, the interfacial tension between the intermediate phase and the oil phase and between the intermediate phase and the water phase can be up to 10 -4 ～10 -5 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 93% OOIP, and compared with the recovery ratio of 45% OOIP of the method adopting only water displacement, the oil displacement method improves the recovery ratio of 48% OOIP.
Example 5
(1) Sodium paraffin sulfonate having an average of 18 carbon atoms and disodium hexadecyl diphenyl oxide disulfonate were mixed at a mass ratio of 70 to 30, and the mixture was added to a crude oil-water mixture mixed at a mass ratio of 50 to 50, and the mixture contained EDTA and isopropyl alcohol at a mass fraction of 1.5%. At a temperature of 50 ℃, the crude oil used had an above-ground viscosity of 44 mPas, an acid value of 2.2mgKOH/g and a total formation water mineralization of 45g/L. The mass fraction of the total amount of the surfactant is 0.3%. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, and a three-phase equilibrium system is present. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
The interfacial tension of the oil phase and the microemulsion phase and the aqueous phase was measured by the conventional spin drop method. When the mass fraction of the sodium carbonate is 1.2-2.4%, the interfacial tension of the two is 10 -3 The results are shown in FIG. 8, which shows mN/m or less. As can be seen from FIG. 8, in this example, when the mass fraction of sodium carbonate is about 2.0%, the interfacial tension reaches 10 -4 mN/m order of magnitude, calculated from the above phase behavior testIs matched with the interfacial tension value of the rubber belt.
Meanwhile, the solubility ratio of oil and water in the microemulsion phase is more than 25 by adopting the calculation formulas (1) and (2) in the embodiment 1, and the interfacial tension between the intermediate phase and the oil and water phases reaches 10 by adopting the calculation formulas (3) and (4) in the embodiment 1 when the mass fraction of sodium carbonate is 2.0% -4 ～10 -5 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 88% OOIP, and compared with the recovery ratio of 44% OOIP of the method only adopting water displacement, the method improves the recovery ratio of 44% OOIP.
Example 6
Sodium alkylnaphthalene sulfonate having an average of 16 carbon atoms and disodium alkyldiphenyloxide disulfonate having an average of 16 carbon atoms in the alkyl chain were mixed at a mass ratio of 60 to 40, and the mixture was added to a crude oil-water mixture mixed at a mass ratio of 50 to 50, and the mixture contained EDTA and isopropyl alcohol in an amount of 0.5% by mass. The temperature was 45 ℃. The crude oil used had an underground viscosity of 46 mPas, an acid value of 1.9mg KOH/g and a total degree of mineralization of 35g/L. The mass fraction of the total amount of the surfactant is 0.3%. The water is sodium carbonate with the mass percent of 1-3% added into the stratum water. After stirring, the mixture reaches equilibrium and a three-phase equilibrium occurs. Analysis shows that the upper phase is almost pure oil phase, the middle phase is microemulsion, and the lower phase is almost pure water phase.
The interfacial tension of the oil phase and the microemulsion phase and the aqueous phase was determined by the usual rotary drop interfacial tension method. When the mass fraction of the sodium carbonate is 1.2-2.0%, the interfacial tension of the two is 10 -3 The results are shown in FIG. 9, which shows mN/m or less. And matching with the interfacial tension value calculated by the phase behavior test.
Meanwhile, the solubility ratio of oil and water in the microemulsion phase is more than 25 by adopting the calculation formulas (1) and (2) in the embodiment 1, and the interfacial tension between the intermediate phase and the oil phase and the water phase is 10 by adopting the calculation formulas (3) and (4) in the embodiment 1 -3 On the order of mN/m.
Thus, the ultra-low interfacial tension provided by the surfactant system used meets the need to displace crude oil of the appropriate composition and viscosity from reservoirs having matched porosity and permeability.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 91%, and compared with the recovery ratio of 44% of the oil displacement method only adopting water, the oil displacement method improves the recovery ratio of 47% OOIP.
Comparative example
Comparative example 1
(1) Sodium hexadecyl benzene sulfonate is prepared into aqueous solution with concentration of 0.3%, the underground viscosity of the crude oil is 46 mPa.s, the acid value is 1.9mgKOH/g, and the total mineralization degree of stratum water is 23g/L at the temperature of 45 ℃. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, only a two-phase system, but no equilibrium of the three-phase state occurs.
The interfacial tension of the oil phase and the water phase was determined by the usual rotary drop interfacial tension method. The interfacial tension is only 10 -1 ～10 -2 In the mN/m range, the mass fraction of sodium carbonate is 1.8wt%, and the interfacial tension reaches 10 -2 On the order of mN/m.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 62%, and compared with the 46% recovery ratio of the method adopting only water displacement, the method improves the recovery ratio of 16% OOIP. The displacement effect is inferior to that of a combination of surfactants using a dual agent.
Comparative example 2
(1) The disodium hexadecyl diphenyl oxide disulfonate is prepared into aqueous solution with the concentration of 0.3 percent, the underground viscosity of crude oil used at the temperature of 45 ℃ is 46 mPa.s, the acid value is 1.9mgKOH/g, and the total mineralization degree of stratum water is 27g/L. The water is sodium carbonate with the mass percent of 0.8-3% added into stratum water. After stirring, the mixture reaches equilibrium, only a two-phase system, but no equilibrium of the three-phase state occurs.
The interfacial tension of the oil phase and the water phase was determined by the usual rotary drop interfacial tension method. The interfacial tension is only 10 -1 At mN/m level, the mass fraction of sodium carbonate is 1.4wt%, and the interfacial tension reaches 10 -1 On the order of mN/m.
(2) Core displacement experiments were performed using Berea sandstone cores of similar permeability and porosity to example 1. The injection mode and concentration were the same as in example 1.
The oil displacement result shows that the total recovery ratio of the oil displacement method reaches 58%, and compared with the recovery ratio of 44% of the oil displacement method only adopting water, the oil displacement method improves the recovery ratio of 14% OOIP. The displacement effect is inferior to that of a combination of surfactants using a dual agent.
The present invention has been described in detail in connection with the detailed description and/or the exemplary examples and the accompanying drawings, but the description is not to be construed as limiting the invention. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, and these fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A surfactant composition for oil displacement comprising a monosulfonate surfactant and an alkyl diphenyl ether disulfonate.
2. The composition according to claim 1, wherein the monosulphonate surfactant is selected from one or more of alkylphenyl sulphonates, alkylnaphthyl xanthates, olefin sulphonates, paraffin sulphonates, preferably alkylphenyl sulphonates.
3. The composition according to claim 2, wherein the alkyl, alkenyl, paraffin carbon number in the alkylphenyl sulfonate, alkylnaphthyl sulfonate, olefin sulfonate, paraffin sulfonate is 8-26, preferably 10-24, more preferably 12-22.
4. The composition according to claim 1, wherein the alkyl diphenyl ether disulfonate has an alkyl carbon number of from 12 to 20, preferably from 12 to 18, more preferably from 12 to 16.
5. Composition according to claim 1, wherein the mass ratio of monosulphonate surfactant to alkyl diphenyl oxide disulfonate is (0.2-4.5): 1, preferably (0.3-3.5): 1.
6. The composition according to claim 1, wherein the surfactant composition for displacement of reservoir oil further comprises a water-soluble polymer and/or a chelating agent, preferably further comprises an alkaline substance.
7. A composition according to any one of claims 1 to 6,
the water-soluble polymer is selected from one or more of polyacrylamide, partially hydrolyzed polyacrylamide, xanthan gum and copolymer of acrylamide and acrylic acid,
the chelating agent is selected from organic amines, preferably organic diamines or organic triamines, more preferably ethylenediamine tetraacetic acid or diethylenetriamine pentaacetic acid,
the alkaline substance is selected from one or more of carbonate, bicarbonate and alkali metal hydroxide.
8. A composition according to any one of claims 1 to 6,
the surfactant composition for oil displacement further comprises an alcohol substance, preferably an alcohol substance with a carbon content of 2-10, and more preferably one or more of isopropanol, isobutanol and isoamyl alcohol.
9. Use of a composition according to any one of claims 1 to 8, preferably for displacing medium-high temperature, medium-high acid number, high mineralization reservoirs;
the oil reservoir temperature is 35-85 ℃, preferably 45-75 ℃, and the oil reservoir mineralization is 10-70 g/L, preferably 15-50 g/L.
10. Use according to claim 9, wherein the acid number of the reservoir is from 0.5 to 5.0mgKOH/g, preferably from 1.0 to 4.0mgKOH/g, more preferably from 1.0 to 3.0mgKOH/g.
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