CN113667465A - Surfactant for improving recovery ratio based on static emulsification and preparation method thereof - Google Patents
Surfactant for improving recovery ratio based on static emulsification and preparation method thereof Download PDFInfo
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- 239000004094 surface-active agent Substances 0.000 title claims abstract description 105
- 238000004945 emulsification Methods 0.000 title claims abstract description 43
- 230000003068 static effect Effects 0.000 title claims abstract description 41
- 238000011084 recovery Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims abstract description 24
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims abstract description 24
- 229960003237 betaine Drugs 0.000 claims abstract description 24
- -1 alcohol amine Chemical class 0.000 claims abstract description 22
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 22
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 22
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 17
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 15
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 10
- BTMZHHCFEOXAAN-UHFFFAOYSA-N 2-[bis(2-hydroxyethyl)amino]ethanol;2-dodecylbenzenesulfonic acid Chemical group OCCN(CCO)CCO.CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O BTMZHHCFEOXAAN-UHFFFAOYSA-N 0.000 claims description 7
- 229940105956 tea-dodecylbenzenesulfonate Drugs 0.000 claims description 7
- 230000033558 biomineral tissue development Effects 0.000 claims description 5
- 238000013329 compounding Methods 0.000 claims description 4
- 239000000693 micelle Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 3
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 125000001421 myristyl 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])[H] 0.000 claims description 3
- 229940117986 sulfobetaine Drugs 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 2
- 239000003921 oil Substances 0.000 abstract description 33
- 239000010779 crude oil Substances 0.000 abstract description 16
- 238000006073 displacement reaction Methods 0.000 abstract description 11
- 238000009736 wetting Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000013375 chromatographic separation Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding 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
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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 discloses a surfactant for improving recovery efficiency based on static emulsification and a preparation method thereof, belonging to the technical field of oilfield development; the surfactant is prepared from the following raw materials in parts by weight: 10-20 parts of fatty alcohol-polyoxyethylene ether, 25-60 parts of betaine surfactant, 5-12 parts of alcohol amine surfactant, 5-8 parts of triethanolamine, 5-10 parts of sulfamic acid and 2-5 parts of butyl glycol ether; compared with the existing surfactant for oil displacement, the surfactant provided by the invention has the advantages that the comprehensive performance is greatly improved, the surfactant has higher wetting reversion and static emulsification performances aiming at different types of crude oil, and the recovery ratio of the crude oil in a reservoir can be effectively improved.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a surfactant for improving recovery efficiency based on static emulsification and a preparation method thereof.
Background
In recent years, aiming at the development of the surfactant for improving the recovery efficiency, in the industry, in order to pursue the ultra-low interfacial tension index of the surfactant, the surfactant for oil displacement is produced by compounding surfactant products with multiple components to different degrees, so that the synergistic effect among the components can obtain the ultra-low interfacial tension index; however, after the compounded surfactant product is injected into the stratum, due to the chromatographic separation effect generated in the process of flowing of the aqueous solution in the porous medium, the multi-component surfactant product is separated, the original multi-component synergistic effect is lost, the index of ultralow interfacial tension is distorted, the oil displacement effect is deteriorated, and meanwhile, the action mechanism of the interfacial tension in the oil displacement process cannot be completely suitable for all types of crude oil, especially for high-viscosity oil.
In addition, the current surfactant for improving the recovery ratio basically neglects the key functions of static emulsification capacity (low shear) and wetting inversion in the oil displacement process, the water displacement process is actually an oil-carrying emulsification process, crude oil adsorbed on the stratum is stripped through static emulsification and wetting inversion, and the crude oil is carried out from the stratum; in addition, certain external force such as stirring and emulsification is given in the current emulsification capability test process, the injection radius is increased, the drainage area of the stratum is increased, the shearing force applied to the fluid in the stratum is gradually reduced, and the shearing force applied to the crude oil in the stratum by the surfactant aqueous solution is reduced or even is shear-free in the oil displacement process neglected in the surface activity; it is therefore necessary to develop a surfactant based on static emulsification (low shear, no shear).
Disclosure of Invention
The invention aims to: the surfactant for improving the recovery rate based on static emulsification and the preparation method thereof are provided, the comprehensive performance of the surfactant is greatly improved, the surfactant has higher wetting inversion and static emulsification performance aiming at different types of crude oil, and the recovery rate of the reservoir crude oil can be effectively improved.
The technical scheme adopted by the invention is as follows:
in order to achieve the aim, the invention provides a surfactant for improving the recovery ratio based on static emulsification, which is prepared from the following raw materials in parts by weight: 10-20 parts of fatty alcohol-polyoxyethylene ether, 25-60 parts of betaine surfactant, 5-12 parts of alcohol amine surfactant, 5-8 parts of triethanolamine, 5-10 parts of sulfamic acid and 2-5 parts of butyl glycol ether.
Preferably, the cleaning agent comprises 20 parts of fatty alcohol-polyoxyethylene ether, 60 parts of betaine surfactant, 12 parts of alcohol amine surfactant, 8 parts of triethanolamine, 10 parts of sulfamic acid and 5 parts of ethylene glycol monobutyl ether.
Preferably, 10 parts of fatty alcohol-polyoxyethylene ether, 25 parts of betaine surfactant, 5 parts of alcohol amine surfactant, 5 parts of triethanolamine, 5 parts of sulfamic acid and 2 parts of ethylene glycol monobutyl ether.
Preferably, the betaine surfactant is one selected from the group consisting of lauryldimethylhydroxypropylsulphobetaine, cocamidopropyl betaine, and tetradecyldimethyl betaine.
Preferably, the chemical formula of the fatty alcohol-polyoxyethylene ether is R-O (CH)2CH2O) n-H, wherein R is C12N is 3 to 5.
Preferably, the alcohol amine surfactant is triethanolamine dodecylbenzene sulfonate.
Preferably, the mineralization degree of the surfactant is more than or equal to 20x104mg/L, temperature resistance is more than or equal to 140 ℃.
A preparation method of a surfactant for improving recovery efficiency based on static emulsification comprises the following preparation steps:
(1) putting fatty alcohol-polyoxyethylene ether and sulfamic acid into a membrane reactor, and sulfonating under the catalysis of triethanolamine to obtain fatty alcohol-polyoxyethylene ether sulfate;
(2) and (3) carrying out 1: 1, then compounding with betaine surfactant and alcohol amine surfactant, keeping the temperature of 80 +/-5 ℃, stirring for 4 hours to form a long-chain surfactant micelle system, and adjusting the pH value of the system to 7 to obtain the surfactant for improving the recovery ratio based on static emulsification.
The fatty alcohol-polyoxyethylene ether is sulfonated to form C12The linear alkyl substituted group anionic surfactant is compounded and synthesized with betaine, alcamines and sulfamic acid to form a low-interface surfactant system, so that the oil-water interface activity is increased, and a reasonable lipophilic group (C) is added12—C18) So that the system is easy to form O/W emulsion or dispersed phase under static or low shearing force;
at the same time, C is formed12With a linear alkyl substituent of the formula (I) is readily reacted with C12—C18The betaine surfactant forms winding micelle, the system viscosity is obviously enhanced, and the similar and strong oleophylic group substituent (C)12—C18) The surfactant system is vertically arranged on an oil-water interface due to the steric hindrance of the system to form a thick compact viscoelastic interface film with high strength, high interfacial activity and high strength, so that the surfactant system is easier to stabilize O/W emulsion or dispersed phase, changes the phase state of crude oil, exists in the system in an emulsion state and is extracted;
furthermore, C12The surfactant system compounded and synthesized by the linear alkyl substituent group anionic surfactant, a small amount of fatty alcohol ether surfactant and the alcohol amine surfactant has strong hydrophilicity and wetting and overturning capacity, is mainly reflected in that the system is easy to drag and wrap an oil layer on the surface of an oil-containing rock into a water phase by using a special oleophylic group of the oil layer to form a stable O/W emulsion or a dispersed phase, can permeate a stubborn oil phase adsorption layer on the surface of the rock, peels the stubborn oil phase adsorption layer on the surface of the rock by using the hydrophilic group of the oil phase adsorption layer, and then adsorbs part of the surfactant on the surface of the rockThe original oil-wetted rock surface is changed into water-wetted rock surface, so that the oil phase in the later-period produced liquid is not adsorbed or acted with the stratum any more, and the oil phase permeability and the crude oil recovery rate are increased.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, fatty alcohol-polyoxyethylene ether and sulfamic acid are sulfonated and then subjected to alkaline compound reaction with betaine and alcohol amine surfactants to obtain a surfactant product with enhanced recovery ratio based on static emulsification performance, and the surfactant product has higher wetting inversion and static emulsification performance for different types of crude oil, and the mineralization resistance is more than or equal to 20x104mg/L, can resist the temperature of more than 140 ℃, and has better adsorption resistance and chromatographic separation resistance.
2. The surfactant product for improving the recovery ratio based on static emulsification has better self-emulsifying capacity on crude oil under low shear, and can effectively improve the recovery ratio of reservoir crude oil and reduce the load of an oil pumping unit of an oil well by emulsifying and viscosity reducing the water-containing thickened oil and the high-asphalt-containing colloid crude oil, so that the maintenance period of the oil well is greatly prolonged while the recovery ratio of the oil well is improved.
3. The surfactant product for improving the recovery efficiency based on static emulsification has the emulsification rate of more than or equal to 90 percent on crude oil, the viscosity reduction rate of more than or equal to 95 percent and the interfacial tension of less than or equal to 10 percent-2The mN/m, the contact angle drop value is more than or equal to 50 degrees, the static oil washing capacity is more than or equal to 85 percent, and compared with the existing surfactant for oil displacement, the comprehensive performance of the surfactant is greatly improved.
Detailed Description
The technical solutions of the present invention are described clearly and completely below with reference to the following embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a surfactant for improving the recovery ratio based on static emulsification, which is prepared from the following raw materials in parts by weight: 20 parts of fatty alcohol-polyoxyethylene ether, 60 parts of betaine surfactant (dodecyl-tetradecyl dimethyl hydroxypropyl sulfobetaine), 12 parts of alcohol amine surfactant (triethanolamine dodecylbenzene sulfonate), 8 parts of triethanolamine, 10 parts of sulfamic acid and 5 parts of ethylene glycol monobutyl ether.
Example 2
The present example provides a surfactant for enhanced oil recovery based on static emulsification, which is different from example 1 in that the surfactant is prepared from the following raw materials in parts by weight: 15 parts of fatty alcohol-polyoxyethylene ether, 40 parts of betaine surfactant (dodecyl-tetradecyl dimethyl hydroxypropyl sulfobetaine), 10 parts of alcohol amine surfactant (triethanolamine dodecylbenzene sulfonate), 6 parts of triethanolamine, 10 parts of sulfamic acid and 4 parts of ethylene glycol monobutyl ether.
Example 3
The present example provides a surfactant for enhanced oil recovery based on static emulsification, which is different from example 1 in that the surfactant is prepared from the following raw materials in parts by weight: 10 parts of fatty alcohol-polyoxyethylene ether, 25 parts of betaine surfactant (cocamidopropyl betaine), 5 parts of alcohol amine surfactant (triethanolamine dodecylbenzene sulfonate), 5 parts of triethanolamine, 5 parts of sulfamic acid and 2 parts of ethylene glycol monobutyl ether.
Example 4
The present example provides a surfactant for enhanced oil recovery based on static emulsification, which is different from example 1 in that the surfactant is prepared from the following raw materials in parts by weight: 20 parts of fatty alcohol-polyoxyethylene ether, 50 parts of betaine surfactant (tetradecyl dimethyl betaine), 10 parts of alcohol amine surfactant (triethanolamine dodecylbenzene sulfonate), 6 parts of triethanolamine, 8 parts of sulfamic acid and 5 parts of ethylene glycol monobutyl ether.
Example 5
The present example provides a surfactant for enhanced oil recovery based on static emulsification, which is different from example 1 in that the surfactant is prepared from the following raw materials in parts by weight: 10 parts of fatty alcohol-polyoxyethylene ether, 30 parts of betaine surfactant (tetradecyl dimethyl betaine), 10 parts of alcohol amine surfactant (triethanolamine dodecylbenzene sulfonate), 5 parts of triethanolamine, 5 parts of sulfamic acid and 2 parts of ethylene glycol monobutyl ether.
Example 6
The embodiment provides a preparation method of the surfactant according to any one of preparation embodiments 1 to 5, which includes the following preparation steps:
(1) putting fatty alcohol-polyoxyethylene ether and sulfamic acid into a membrane reactor, and sulfonating under the catalysis of triethanolamine to obtain fatty alcohol-polyoxyethylene ether sulfate;
(2) and (3) carrying out 1: 1, then compounding with betaine surfactant and alcohol amine surfactant, keeping the temperature of 80 +/-5 ℃, stirring for 4 hours to form a long-chain surfactant micelle system, and adjusting the pH value of the system to 7 to obtain the surfactant for improving the recovery ratio based on static emulsification.
The surfactant for improving the recovery ratio based on static emulsification in example 1 was used for an in-situ oil displacement experiment, and the reagent materials included fracturing truck, the surfactant for improving the recovery ratio based on static emulsification, oxygen-reduced air, and the like.
Test 1: the method completes the measures of reducing oxygen in 8-19 wells by using air and emulsifying and reducing viscosity in 2018, 10 months and 3 days, and the liquid production is 6.85m before the air is reduced by using the wells3D, daily oil production is 2.29t/d, and the water content is 64 percent; daily liquid yield of 9.1m after huff and puff3And d, the daily oil yield is 6.37t/d, the water content is 25 percent, and the effect of the measures is obvious compared with the increase of 4.08t/d in the day before the measures.
Test 2: 4-6-well oxygen-reducing air huff and puff and emulsification viscosity reduction measures are completed in 2018, 9 months and 14 days, and the liquid production is 6.04m before the well measures3D, 1.35t/d of daily oil production and 76% of water; daily liquid yield of 17.5m after huff and puff3And d, the daily oil yield is 12.53t/d, the water content is 23 percent, and the effect of the measures is obvious compared with the increase of 11.18t/d in the day before the measures.
TABLE 1 comparison of oil displacement effect of surfactants for enhanced recovery based on static emulsification
As can be seen from Table 1, the oil recovery ratio is greatly improved after the surfactant for improving the recovery ratio based on static emulsification provided by the invention is used for oil displacement, and the surfactant has a good application effect.
Through detection, the surfactant for improving the recovery ratio based on static emulsification provided by the invention has the following properties:
(1) the crude oil emulsification rate is more than or equal to 90 percent, the viscosity reduction rate is more than or equal to 95 percent, and the interfacial tension is less than or equal to 10 percent-2mN/m, the reduction value of the contact angle is more than or equal to 50 degrees;
(2) the method is insensitive to the mineralization degree, and the index retention rate is more than or equal to 90 percent in a wide mineralization degree range;
(3) the method is insensitive to dilution, and the concentration is still over 90 percent of functionality when being reduced from 1 percent to 0.1 percent;
(4) insensitive to oil phase, with C10-16The action effect of the alkane is consistent;
(5) the static adsorption and dynamic adsorption capacity is small, and the adsorption has more than 90% of functionality;
(6) the static oil washing capacity is more than or equal to 85 percent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (8)
1. The surfactant for improving the recovery ratio based on static emulsification is characterized by being prepared from the following raw materials in parts by weight: 10-20 parts of fatty alcohol-polyoxyethylene ether, 25-60 parts of betaine surfactant, 5-12 parts of alcohol amine surfactant, 5-8 parts of triethanolamine, 5-10 parts of sulfamic acid and 2-5 parts of butyl glycol ether.
2. The surfactant for enhancing oil recovery based on static emulsification according to claim 1, wherein the surfactant is prepared from the following raw materials in parts by weight: 20 parts of fatty alcohol-polyoxyethylene ether, 60 parts of betaine surfactant, 12 parts of alcohol amine surfactant, 8 parts of triethanolamine, 10 parts of sulfamic acid and 5 parts of ethylene glycol monobutyl ether.
3. The surfactant for enhancing oil recovery based on static emulsification according to claim 1, wherein the surfactant is prepared from the following raw materials in parts by weight: 10 parts of fatty alcohol-polyoxyethylene ether, 25 parts of betaine surfactant, 5 parts of alcohol amine surfactant, 5 parts of triethanolamine, 5 parts of sulfamic acid and 2 parts of ethylene glycol monobutyl ether.
4. The surfactant for enhanced oil recovery based on static emulsification according to claim 1, wherein the betaine surfactant is one selected from the group consisting of dodecyl dimethyl hydroxypropyl sulfobetaine, cocamidopropyl betaine, and tetradecyl dimethyl betaine.
5. The surfactant for enhanced oil recovery based on static emulsification according to claim 1, wherein the fatty alcohol-polyoxyethylene ether has a chemical formula of R-O (CH)2CH2O) n-H, wherein R is C12N is 3 to 5.
6. The surfactant for enhanced oil recovery based on static emulsification according to claim 1, wherein the alcohol amine surfactant is triethanolamine dodecylbenzene sulfonate.
7. The surfactant for enhanced oil recovery based on static emulsification according to claim 1,the mineralization resistance of the surfactant is more than or equal to 20x104mg/L, temperature resistance is more than or equal to 140 ℃.
8. A preparation method of a surfactant for improving recovery efficiency based on static emulsification is characterized by comprising the following preparation steps:
(1) putting fatty alcohol-polyoxyethylene ether and sulfamic acid into a membrane reactor, and sulfonating under the catalysis of triethanolamine to obtain fatty alcohol-polyoxyethylene ether sulfate;
(2) and (3) carrying out 1: 1, then compounding with betaine surfactant and alcohol amine surfactant, keeping the temperature of 80 +/-5 ℃, stirring for 4 hours to form a long-chain surfactant micelle system, and adjusting the pH value of the system to 7 to obtain the surfactant for improving the recovery ratio based on static emulsification.
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| CN107936936A (en) * | 2017-11-30 | 2018-04-20 | 山东安捷宇石油技术服务有限公司 | A kind of oil displacement agent and preparation method thereof |
| CN109294548A (en) * | 2018-11-29 | 2019-02-01 | 西安长庆化工集团有限公司 | A kind of ageing oil low-temperature demulsification thinner and its preparation method and application |
| CN111732525A (en) * | 2020-07-31 | 2020-10-02 | 湖南丽臣奥威实业有限公司 | Method for preparing non-aqueous system fatty alcohol ether sulfuric acid organic alkanolamine salt product |
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