CN116376531A - Self-emulsifying ultralow interfacial tension oil displacement agent and preparation method thereof - Google Patents
Self-emulsifying ultralow interfacial tension oil displacement agent and preparation method thereof Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003245 coal Substances 0.000 claims abstract description 34
- -1 alkyl diphenyl ether Chemical compound 0.000 claims abstract description 31
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 27
- 239000011734 sodium Substances 0.000 claims abstract description 27
- 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 claims abstract description 21
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 17
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 13
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 13
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 13
- 229920001451 polypropylene glycol Polymers 0.000 claims abstract description 13
- 150000001336 alkenes Chemical class 0.000 claims abstract description 12
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Natural products C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000004996 alkyl benzenes Chemical class 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003786 synthesis reaction Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000006277 sulfonation reaction Methods 0.000 claims description 4
- 230000029936 alkylation Effects 0.000 claims description 2
- 238000005804 alkylation reaction Methods 0.000 claims description 2
- 230000007062 hydrolysis Effects 0.000 claims description 2
- 238000006460 hydrolysis reaction Methods 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 abstract description 12
- 239000002245 particle Substances 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 9
- 238000003756 stirring Methods 0.000 abstract description 5
- 235000019198 oils Nutrition 0.000 abstract 5
- 235000019476 oil-water mixture Nutrition 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 71
- 239000010779 crude oil Substances 0.000 description 26
- 239000007864 aqueous solution Substances 0.000 description 23
- 238000004945 emulsification Methods 0.000 description 8
- 238000011084 recovery Methods 0.000 description 7
- 230000003472 neutralizing effect Effects 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 5
- 238000007865 diluting Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000002152 alkylating effect Effects 0.000 description 3
- 230000003301 hydrolyzing effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229940077388 benzenesulfonate Drugs 0.000 description 2
- 125000006267 biphenyl group Chemical group 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004391 petroleum recovery Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZIWRUEGECALFST-UHFFFAOYSA-M sodium 4-(4-dodecoxysulfonylphenoxy)benzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCOS(=O)(=O)c1ccc(Oc2ccc(cc2)S([O-])(=O)=O)cc1 ZIWRUEGECALFST-UHFFFAOYSA-M 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 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
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- 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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the technical field of ultralow interfacial tension oil displacement agents, and discloses a self-emulsifying ultralow interfacial tension oil displacement agent and a preparation method thereof. The formula consists of the following raw materials: 15-25% of coal-based olefin sodium sulfonate, 5-15% of coal-based alkyl benzene sodium sulfonate, 5-10% of alkyl diphenyl ether disulfonate, 3-10% of fatty alcohol polyoxypropylene polyoxyethylene ether and the balance of water. The self-emulsifying ultralow interfacial tension oil displacement agent prepared by uniformly stirring the raw materials can reduce the interfacial tension between oil and water to be ultralow and has long duration, and the oil displacement agent can also enable an oil-water mixture to self-emulsify under the condition of small external force or no external force, so that the particle size of the obtained emulsion is smaller than 2 mu m.
Description
Technical Field
The invention relates to the technical field of ultralow interfacial tension oil displacement agents, in particular to a self-emulsifying ultralow interfacial tension oil displacement agent and a preparation method thereof.
Background
Petroleum is an important strategic material, and in the long term in the future, a low-permeability oil reservoir will occupy an important position in the petroleum industry, and is an important resource foundation for the increased storage and production in the petroleum industry. The low-permeability oil reservoir has fine pore throat, high capillary force, low recovery ratio in the water injection development process and large amount of crude oil resources remained in the stratum and cannot be exploited.
The improvement of the petroleum recovery ratio through chemical flooding is an important technical means. The action mechanism of the surfactant flooding to improve the recovery ratio mainly comprises: reducing the interfacial tension between crude oil and water in the stratum, improving the wettability of the stratum, generating emulsification, increasing the surface charge density of the crude oil and the like, and extracting the crude oil bound in the stratum. The oil/water interfacial tension is reduced, the capillary force is overcome, the capillary number is increased, the surfactant is one of mechanisms for improving the petroleum recovery rate, and the ultralow interfacial tension is also a basic requirement of the surfactant for oil recovery of a plurality of domestic oil fields. The other main mechanism of the surfactant for improving the recovery ratio of crude oil is emulsion oil displacement, and a large number of experimental researches and field application examples show that the emulsion of the produced liquid has good emulsification effect and good recovery ratio improvement effect, and the emulsion has double functions of oil displacement and profile control in the stratum migration process. Especially for low permeability oil reservoir, the average pore throat diameter of stratum is small, the conventional emulsification method generally requires to apply higher external energy, self-emulsification can be automatically mixed into emulsion under the action of no external force or tiny external force, the particle size of the formed emulsion is small, and the emulsification of the surfactant is utilized to emulsify crude oil into small oil drops with average particle size smaller than the average pore throat diameter of the corresponding stratum, so that the crude oil can smoothly pass through rock pore channels, and the purpose of improving recovery ratio is achieved.
Therefore, the self-emulsifying ultralow interfacial tension oil displacement agent is obtained through research and has important strategic significance in improving the oil recovery ratio.
Disclosure of Invention
In view of the above, the invention provides a self-emulsifying ultralow interfacial tension oil displacement agent and a preparation method thereof, which can reduce interfacial tension between oil and water to ultralow in a wide concentration range, has high interfacial tension reduction speed and ensures that the interfacial tension between oil and water is stabilized in the ultralow range for a long time.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a self-emulsifying ultralow interfacial tension oil displacement agent, which comprises the following components in percentage by mass: 15-25% of coal-based olefin sodium sulfonate, 5-15% of coal-based alkyl benzene sodium sulfonate, 5-10% of alkyl diphenyl ether disulfonate, 3-10% of fatty alcohol polyoxypropylene polyoxyethylene ether and the balance of water.
Preferably, the coal-based sodium olefin sulfonate is obtained by sulfonation, neutralization, hydrolysis and separation of a C8-C24 fraction section of a Fischer-Tropsch synthesis alkane-alkene mixture.
Preferably, the sodium coal-based alkylbenzene sulfonate is obtained by alkylation, sulfonation, neutralization and separation of a C10-C16 fraction section of a Fischer-Tropsch synthesis alkane-alkene mixture.
Preferably, the structural formula of the alkyl diphenyl ether sodium disulfonate is:
wherein R is C m H 2m+1 M is any integer from 8 to 16; r' is C n H 2n+1 N is 0 or an integer of 8 to 16.
Preferably, the molecular formula of the fatty alcohol polyoxypropylene polyoxyethylene ether is C x P y E z Wherein x is any integer from 8 to 16, y is any integer from 3 to 9, and z is any integer from 2 to 8.
The invention also provides a preparation method of the self-emulsifying ultralow interfacial tension oil displacement agent, which is characterized in that coal-based sodium olefin sulfonate, coal-based sodium alkylbenzenesulfonate, sodium alkyl diphenyl ether disulfonate, fatty alcohol polyoxypropylene polyoxyethylene ether and water are mixed to obtain the self-emulsifying ultralow interfacial tension oil displacement agent.
Compared with the prior art, the invention has the following beneficial effects:
(1) The self-emulsifying ultralow interfacial tension oil displacement agent can reduce interfacial tension between oil and water to ultralow in a wide concentration range, and the use concentration of the oil displacement agent is 0.05-1%;
(2) The self-emulsifying ultralow interfacial tension oil displacement agent can reduce the interfacial tension between oil and water to be ultralow within 10min, and the duration of the ultralow interfacial tension is more than 2h;
(3) The self-emulsifying ultralow interfacial tension oil displacement agent can enable oil-water to be self-emulsified under the condition of small external force or no external force, and the emulsion has small and uniform particle size, and the average particle size is less than 2 mu m;
(4) The coal-based sodium olefin sulfonate and the coal-based sodium alkyl benzene sulfonate used in the invention are derived from the Fischer-Tropsch synthesis of the alkane-alkene mixture, so that the raw material cost is low;
(5) The raw materials used in the invention have no gel phase region, the raw materials are convenient to use, and the production flow is simple and convenient.
Detailed Description
The invention provides a self-emulsifying ultralow interfacial tension oil displacement agent, which comprises the following components in percentage by mass: 15-25% of coal-based olefin sodium sulfonate, 5-15% of coal-based alkyl benzene sodium sulfonate, 5-10% of alkyl diphenyl ether disulfonate, 3-10% of fatty alcohol polyoxypropylene polyoxyethylene ether and the balance of water.
In the present invention, the coal-based sodium olefin sulfonate (coal-based AOS) is preferably obtained by sulfonating, neutralizing, hydrolyzing and separating a C8-C24 fraction of a fischer-tropsch synthesis alkane-alkene mixture, more preferably by sulfonating, neutralizing, hydrolyzing and separating a C10-C20 fraction, and still more preferably by sulfonating, neutralizing, hydrolyzing and separating a C12-C18 fraction.
In the present invention, the sodium coal-based alkylbenzenesulfonate (coal-based LAS) is preferably obtained by alkylating, sulfonating, neutralizing and separating a C10-C16 fraction of a fischer-tropsch synthesis alkane-alkene mixture, more preferably by alkylating, sulfonating, neutralizing and separating a C11-C15 fraction, and still more preferably by alkylating, sulfonating, neutralizing and separating a C12-C14 fraction.
In the invention, the structural formula of the alkyl diphenyl ether sodium disulfonate is preferably:
wherein R is preferably C m H 2m+1 M is preferably an integer of 8 to 16, more preferably an integer of 11 to 15, and even more preferably an integer of 12 to 14; r' is preferably C n H 2n+1 N is preferably 0 or an integer of 8 to 16, more preferably an integer of 11 to 15, and even more preferably an integer of 12 to 14.
In the invention, the alkyl diphenyl ether sodium disulfonate is a salt-resistant and temperature-resistant anionic surfactant with a amphiphilic head group, and because the molecular structure of the alkyl diphenyl ether sodium disulfonate contains a diphenyl ring structure, the steric hindrance of a hydrophobic chain on the interface is large, so that the alkyl diphenyl ether sodium disulfonate is loose in arrangement of an oil-water interface and high in interfacial tension when being singly used, but the diphenyl ring structure in the structure has strong affinity with polycyclic aromatic hydrocarbon in crude oil colloid and asphaltene, and good emulsifying effect on crude oil is obtained after reasonable compounding.
In the invention, the molecular formula of the fatty alcohol polyoxypropylene polyoxyethylene ether is preferably C x P y E z Wherein x is preferably any integer from 8 to 16, more preferably any integer from 10 to 15, more preferably any integer from 12 to 14, y is preferably any integer from 3 to 9, more preferably any integer from 4 to 8, more preferably any integer from 5 to 6, and z is preferably any integer from 2 to 8, more preferably any integer from 3 to 6, more preferably any integer from 4 to 5.
In the molecular formula of the fatty alcohol polyoxypropylene polyoxyethylene ether, P is a PO group, and E is an EO group.
In the invention, in the molecular structure of the fatty alcohol polyoxypropylene polyoxyethylene ether, as EO and PO groups are contained simultaneously, the fatty alcohol polyoxypropylene polyoxyethylene ether has a special arrangement structure on an oil-water interface, and is favorable for self-emulsification.
The invention also provides a preparation method of the self-emulsifying ultralow interfacial tension oil displacement agent, which comprises the following steps:
mixing coal-based sodium olefin sulfonate, coal-based sodium alkylbenzenesulfonate, alkyl diphenyl ether disulfonate, fatty alcohol polyoxypropylene polyoxyethylene ether and water to obtain the self-emulsifying ultralow interfacial tension oil displacement agent.
The self-emulsifying ultralow interfacial tension oil displacement agent is prepared by compounding the coal-based sodium olefin sulfonate and the coal-based sodium alkyl benzene sulfonate serving as main agents, and can reduce the interfacial tension between oil and water to be ultralow, and the interfacial tension is fast to reduce and the ultralow interfacial tension is long in maintenance time.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The self-emulsifying ultralow interfacial tension oil displacement agent comprises the following components in percentage by mass: 15% coal-based C 8～12 AOS,13% coal-based C 10～14 LAS,10% sodium bis-C-octaalkyl diphenyl ether disulfonate, 7%C 8 P 3 E 2 And (3) mixing 55% of water, and uniformly stirring the raw material components to obtain the self-emulsifying ultralow interfacial tension oil displacement agent.
Diluting the prepared oil displacement agent with mineralized water of an original oil field to respectively prepare an oil displacement agent aqueous solution with the mass concentration of 0.05%, an oil displacement agent aqueous solution with the mass concentration of 0.3% and an oil displacement agent aqueous solution with the mass concentration of 1%.
The interfacial tension between the 0.05% oil displacement agent aqueous solution and the crude oil is measured by a TX-500C interfacial tension meter to be 0.003mN/m in 5min, and 0.003mN/m in 2h; the interfacial tension between the 1% aqueous solution of the oil displacement agent and the crude oil is 0.004mN/m after 5min, and the interfacial tension is 0.003mN/m after 2 h.
Adding crude oil and 0.3% water solution of oil displacement agent into a sample bottle according to the volume ratio of oil to water of 7:3, placing into a 50 ℃ constant temperature box, sealing and standing for 1h, and turning over the sample bottle for 5 times, so that the crude oil and water can be self-emulsified, and the average particle size of the obtained emulsion is 1 μm.
Example 2
The self-emulsifying ultralow interfacial tension oil displacement agent comprises the following components in percentage by mass: 22% coal-based C 14～18 AOS,5% coal-based C 12～16 LAS,8% sodium dodecyl diphenyl ether disulfonate, 10% C 1214 P 8 E 5 And (3) mixing 55% of water, and uniformly stirring the raw material components to obtain the self-emulsifying ultralow interfacial tension oil displacement agent.
Diluting the prepared oil displacement agent with mineralized water of Jidong oilfield to respectively prepare an oil displacement agent aqueous solution with the mass concentration of 0.05%, an oil displacement agent aqueous solution with the mass concentration of 0.3% and an oil displacement agent aqueous solution with the mass concentration of 1%.
The interfacial tension between the 0.05% oil displacement agent aqueous solution and the Jidong crude oil is measured by a TX-500C interfacial tension meter for 15min and is 0.002mN/m, and the interfacial tension is measured after 2h and is 0.004mN/m; the interfacial tension between the 1% aqueous solution of the oil-displacing agent and Jidong crude oil is 0.004mN/m for 10min, and the interfacial tension is 0.002mN/m after 2 h.
Adding Jidong crude oil and an aqueous solution of an oil displacement agent with the concentration of 0.3 percent into a sample bottle according to the volume ratio of oil to water of 7:3, placing the sample bottle in a constant temperature box at 50 ℃ for sealing and standing for 1h, and turning the sample bottle over for 5 times, so that the crude oil and water can be self-emulsified, and the average particle size of the obtained emulsion is 0.8 mu m.
Example 3
The self-emulsifying ultralow interfacial tension oil displacement agent comprises the following components in percentage by mass: 20% coal-based C 18～24 AOS,5% coal-based C 12～16 LAS,5% sodium bis hexadecyl diphenyl ether disulfonate, 5%C 1214 P 8 E 5 And (3) mixing 65% of water, and uniformly stirring the raw material components to obtain the self-emulsifying ultralow interfacial tension oil displacement agent.
Diluting the prepared oil displacement agent with mineralized water of a Changqing oilfield to respectively prepare an oil displacement agent aqueous solution with the mass concentration of 0.05%, an oil displacement agent aqueous solution with the mass concentration of 0.3% and an oil displacement agent aqueous solution with the mass concentration of 1%.
The interfacial tension between 0.05% of the aqueous solution of the oil displacement agent and long-term crude oil is measured by a TX-500C interfacial tension meter to be 0.005mN/m in 10min, and the interfacial tension is measured after 2h to be 0.005mN/m; the interfacial tension between the 1% aqueous solution of the oil-displacing agent and the long-term crude oil for 5min is 0.002mN/m, and after 2 hours, the interfacial tension is measured to be 0.002mN/m.
Adding long-day crude oil and an oil displacement agent aqueous solution with the concentration of 0.3% into a sample bottle according to the oil-water volume ratio of 7:3, placing the sample bottle in a 50 ℃ constant temperature box for sealing and standing for 1h, and turning the sample bottle over for 5 times, so that the crude oil and water can be subjected to self-emulsification, and the average particle size of the obtained emulsion is 1.2 mu m.
Example 4
The self-emulsifying ultralow interfacial tension oil displacement agent comprises the following components in percentage by mass: 25% coal-based C 9～13 AOS,13% coal-based C 14～16 LAS,5% sodium dodecyl diphenyl ether disulfonate, 3%C 1214 P 5 E 8 54% of water, and uniformly stirring the raw material components after mixing, thus obtaining the self-emulsifying ultralow interfacial tension oil displacement agent.
Diluting the prepared oil displacement agent with mineralized water of northwest oil fields to respectively prepare an oil displacement agent aqueous solution with the mass concentration of 0.05%, an oil displacement agent aqueous solution with the mass concentration of 0.3% and an oil displacement agent aqueous solution with the mass concentration of 1%.
The interfacial tension between 0.05% of the aqueous solution of the oil displacement agent and northwest crude oil is measured by a TX-500C interfacial tension meter to be 0.003mN/m/, and the interfacial tension is measured after 2 hours to be 0.005mN/m; the interfacial tension between the 1% aqueous solution of the oil-displacing agent and northwest crude oil is 0.004mN/m for 5min, and the interfacial tension is 0.003mN/m after 2 h.
Adding northwest crude oil and an oil displacement agent aqueous solution with the concentration of 0.3% into a sample bottle according to the oil-water volume ratio of 7:3, placing the sample bottle in a 50 ℃ constant temperature box for sealing and standing for 1h, and turning the sample bottle over for 5 times, so that the crude oil and water can be subjected to self-emulsification, and the average particle size of the obtained emulsion is 1 mu m.
From the above examples, the oil-displacing agent of the present invention has an interfacial tension between the oil-displacing agent and crude oil of 0.001-0.005 mN/m when the concentration of the oil-displacing agent is 0.05% and 0.1%, and the oil-water interfacial tension of the oil-displacing agent of the present invention can be reduced to ultra-low, and the interfacial tension between the oil and the water is below 0.003mN/m within 2 hours, i.e. the ultra-low interfacial tension maintaining time is long. The oil displacement agent prepared by the invention can enable oil and water to be self-emulsified under the condition of small external force or no external force, and the particle size of the obtained emulsion is small and uniform, and the average particle size is below 2 mu m.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The self-emulsifying ultralow interfacial tension oil displacement agent is characterized by comprising the following components in percentage by mass: 15-25% of coal-based olefin sodium sulfonate, 5-15% of coal-based alkyl benzene sodium sulfonate, 5-10% of alkyl diphenyl ether disulfonate, 3-10% of fatty alcohol polyoxypropylene polyoxyethylene ether and the balance of water.
2. The self-emulsifying ultralow interfacial tension oil displacement agent according to claim 1, wherein the coal-based sodium olefin sulfonate is obtained by sulfonation, neutralization, hydrolysis and separation of a C8-C24 fraction section of a Fischer-Tropsch synthesis alkane olefin mixture.
3. The self-emulsifying ultralow interfacial tension oil displacement agent according to claim 1, wherein the coal-based sodium alkylbenzene sulfonate is obtained by alkylation, sulfonation, neutralization and separation of a C10-C16 fraction section of a Fischer-Tropsch synthesis alkane olefin mixture.
4. The self-emulsifying ultralow interfacial tension oil-displacing agent as claimed in claim 2 or 3, wherein the alkyl diphenyl ether sodium disulfonate has a structural formula:
wherein R is C m H 2m+1 M is any integer from 8 to 16; r' is C n H 2n+1 N is 0 or an integer of 8 to 16.
5. The self-emulsifying ultralow interfacial tension oil-displacing agent as claimed in claim 4, wherein the molecular formula of the fatty alcohol polyoxypropylene polyoxyethylene ether is C x P y E z Wherein x is any integer from 8 to 16, y is any integer from 3 to 9, and z is any integer from 2 to 8.
6. The method for preparing the self-emulsifying ultralow interfacial tension oil-displacing agent as claimed in any one of claims 1 to 5, wherein the self-emulsifying ultralow interfacial tension oil-displacing agent is obtained by mixing coal-based sodium olefin sulfonate, coal-based sodium alkylbenzenesulfonate, alkyl diphenyl ether disulfonate, fatty alcohol polyoxypropylene polyoxyethylene ether and water.
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