CN107916096B - Viscoelastic surfactant composition for oil displacement and preparation method and application thereof - Google Patents
Viscoelastic surfactant composition for oil displacement and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a composition of a viscoelastic surfactant for oil displacement,mainly solves the problems that the surfactant used as an oil displacement agent in the prior production technology has poor oil displacement effect in a high-temperature medium-low permeability reservoir, and simultaneously causes great damage to a stratum and an oil well due to alkali. The composition for oil displacement viscoelastic surfactant is adopted, and comprises amphoteric surfactant shown in formula (I) and organic acid salt; the organic acid salt is selected from at least one of (II) in the formula; r 1 Is selected from C 8 ～C 29 Any one of alkyl and alkenyl of (A), R 2 And R 3 Are all independently selected from C 1 ～C 5 X is selected from any one of carboxylate and sulfonate, and the molar ratio of the amphoteric surfactant to the organic acid salt is 1:0.01 to 1: the technical scheme of 100 better solves the technical problem and can be used for oil displacement production of oil fields.
Description
Technical Field
The invention relates to synthesis of a composition of a viscoelastic surfactant for oil displacement and application of the composition as an oil displacement agent.
Background
With the rapid growth of national economy, the contradiction between the supply and demand of domestic petroleum is increasingly prominent, which is mainly manifested by relatively poor oil and gas resources, exploration and development of petroleum and undetermined reserves which cannot keep up with the growth of demand, and relatively low crude oil extraction degree. In order to relieve the shortage of petroleum resources in China, reduce the gap of crude oil yield and guarantee the petroleum safety in China, one of the important measures to be taken is to greatly improve the recovery ratio of crude oil in China. For example, the average oil recovery rate of China petrochemical is only 28%, and more than 70% of oil resources are still not effectively developed and utilized, so that a large amount of residual reserves are left underground. How to further develop potential and efficiency and develop tertiary oil recovery has become one of the problems to be solved urgently.
In tertiary oil recovery, chemical flooding is the main attack technique and direction for improving the recovery ratio in China, and comprises alkali water flooding, surfactant flooding (micelle flooding and microemulsion flooding), polymer flooding and compound flooding. In these chemical flooding techniques, highly effective surface activity cannot be isolatedAgents for lowering the oil-water interfacial tension to an ultra low level (less than 10) -2 mN/m) to cause the residual oil to flow for the purpose of improving the recovery efficiency of crude oil. At present, the surfactant for oil displacement mostly adopts a multi-component compound system, and simultaneously comprises a non-ionic surfactant and an ionic surfactant, and auxiliary agents such as alkali, alcohol and the like are added into part of the formula. For example, patent CN101024764A provides a surfactant for thick oil wells in oil fields, which is composed of water, caustic soda flakes, ethanol, oleic acid, alkylphenol ethoxylates and sodium dodecylbenzenesulfonate. Further, patent CN1394935 discloses a chemical oil-displacing agent, which mainly comprises a sodium octylbenzenesulfonate anionic surfactant, a surfactant auxiliary, a surfactant synergist and a surfactant solubilizer. The oil displacement agent can obviously reduce the structural viscosity of the thickened oil and can reduce the oil-water interfacial tension, thereby improving the crude oil recovery rate. However, the surfactant for tertiary oil recovery still has more problems, the salt tolerance of the anionic surfactant is poor, the nonionic surfactant is sensitive to temperature, is easy to precipitate at high temperature, and is not suitable for being used in large quantities. Therefore, people begin the research of the anionic-nonionic surfactant, namely two nonionic groups with different properties and an anionic group are designed in the same surfactant molecule, so that the anionic-nonionic surfactant has the advantages of both anionic surfactants and nonionic surfactants, has complementary advantages, has excellent temperature resistance and salt resistance, and shows good application prospect. The gemini surfactant has a special structure different from the traditional surfactant, has a series of unique properties such as ultra-low interfacial tension, low critical micelle concentration, low Krafft point, excellent wettability and the like, and also arouses great interest. However, the gemini surfactants developed at home at present are mainly cationic bis-quaternary ammonium salt type, have the defects of large adsorption loss, high cost and the like, and lose the economic basis of application. Most of the special surfactants stay in the indoor basic research stage due to extremely high price, and are difficult to popularize and apply on site. The zwitterionic surfactant has both anionic hydrophilic group and cationic hydrophilic group to exhibit amphiphilicity, can adapt to wide pH value range, has strong chelating effect on metal ions, and can be used for high mineOil layer with high chemical degree and high temperature can displace oil, and the chromatographic separation effect of the composite of non-ionic surfactant and anionic surfactant can be greatly reduced. Therefore, the research and development of the zwitterionic surfactant are receiving more and more attention and attention, and especially the betaine amphoteric surfactant has become one of the hot spots of research in the field of tertiary oil recovery.
With the increasing deepening of the exploitation degree of the oil field, the surfactant with better performance applied to a common oil reservoir cannot form ultra-low interfacial tension with crude oil in a high-temperature medium-low permeability oil reservoir, so that the oil displacement efficiency is poor, and the improvement of the oil field recovery rate is seriously restricted. In order to reduce the oil/water interfacial tension to a greater extent, high-concentration alkali (such as sodium hydroxide, sodium carbonate and the like) is often added, for example, patent CN1439689A discloses an alkali-mixed surfactant-polymer ternary complex oil displacement system and application thereof, wherein the selected alkali is Na 2 CO 3 . However, the alkali brings great damage to the stratum, the oil well and the like in the using process, seriously corrodes equipment and pipelines, expends a large amount of funds on maintenance and repair, and greatly increases the economic cost of tertiary oil recovery. Patent CN201310166961.5 proposes an oil displacement composition of wormlike micelles formed by anionic surfactants, which can improve recovery efficiency to a certain extent. Therefore, aiming at the defects of the prior art and the difficulty that a single surfactant can not meet the oil displacement requirements of lowering the oil-water interfacial tension to be ultralow, good thermal stability, good compatibility and the like under the high-temperature medium-low permeability oil reservoir condition, the provision of a surfactant which is stable in chemical structure and can form 10 with crude oil under the alkali-free, high-temperature medium-low permeability oil reservoir condition is urgently needed －3 ～10 －4 The novel oil displacement system with the ultra-low interface tension of mN/m and the effective improvement of the crude oil recovery efficiency expands the range of the improved recovery efficiency into the application of high-temperature medium-low permeability harsh oil fields.
Disclosure of Invention
One of the technical problems to be solved by the invention is the problem that the surfactant in the prior art has low oil displacement efficiency under the conditions of high temperature, medium and low permeability, and the invention provides a novel viscoelastic surfactant composition which has the characteristic of high oil displacement efficiency and is particularly suitable for Huosu oilfield Sanchi oil fields.
The second technical problem to be solved by the present invention is to provide a method for preparing a viscoelastic surfactant composition corresponding to the first technical problem.
The invention also provides an application of the composition of the viscoelastic surfactant in oil displacement of oil fields.
In order to solve one of the above technical problems, the technical scheme adopted by the invention is as follows: a composition of viscoelastic surfactants comprising an amphoteric surfactant and an organic acid salt; the molar ratio of the amphoteric surfactant to the organic acid salt is 1:0.01 to 1:100, respectively; the amphoteric surfactant is selected from at least one of structures shown in a formula (I); the organic acid salt is selected from at least one of structures shown in a formula (II);
r in the formula (I) 1 Is selected from C 8 ～C 29 Any one of alkyl and alkenyl of (A), R 2 And R 3 Are all independently selected from C 1 ～C 5 Any one of alkylene and hydroxy-substituted alkylene of (1), said R 4 And R 5 Are all independently selected from C 1 ～C 4 At least one of alkyl and hydroxyl-substituted alkyl; in the formula (II), X is selected from any one of carboxylate and sulfonate, and Y is selected from any one of hydrogen, alkyl, hydroxyl, halogen and amino.
In the above technical scheme, R 4 And R 5 Are all independently preferably selected from C 1 ～C 4 Alkyl groups of (a); more preferably R 4 And R 5 Are all selected from methyl, in which case the betaine surfactant is selected from at least one of the structures shown in formula (I'):
in this case, the interfacial tension property is more excellent in combination with the organic acid salt.
In the technical scheme, R is preferably selected 1 Is C 12 ～C 25 Any one of alkyl or alkenyl of (A), R 2 Is C 2 ～C 3 Any one of alkylene or hydroxy-substituted alkylene of (A), R 3 Is C 1 ～C 3 An alkylene group of (a).
From the viewpoint of improving the recovery ratio, the most preferable technical scheme is as follows: r 1 Is C 16 ～C 22 Any one of alkyl or alkenyl of (A), R 2 Is C 3 Any one of alkylene or hydroxy-substituted alkylene of (A), R 3 Is C 1 ～C 2 An alkylene group of (a); the organic acid salt is at least one selected from naphthalene sulfonate, amino-substituted naphthalene sulfonate, hydroxy-substituted naphthalene carboxylate and hydrocarbyl-substituted naphthalene carboxylate.
In the above technical scheme, the betaine surfactant is selected from two or more of structures shown in formula (I) or formula (I'), such as R, from the perspective of synergistically reducing interfacial tension and improving recovery efficiency 1 Two or more betaine surfactants having different carbon atoms, in which case R 1 Two or more betaine surfactants having different carbon atoms have a good synergistic effect with an anionic surfactant, and R is preferably represented by formula (I) or formula (I') 1 Is C 15 ～C 29 At least one of the long carbon chain amphoteric surfactants of (a) and R represented by formula (I) or formula (I') (I) 1 Is C 8 ～C 14 A combination of at least one of the short carbon chain amphoteric surfactants of (a).
In the above-mentioned embodiment, the molar ratio of the amphoteric surfactant to the organic acid salt is preferably (1.
In the technical scheme, the composition of the viscoelastic surfactant for oil displacement also comprises water, and is particularly suitable for water flooding by using the surfactant.
To solve the second technical problem, the invention adopts the following technical scheme: a process for the preparation of a viscoelastic surfactant composition according to one of the above technical problems, comprising the steps of:
a) Fatty acid or ester thereof reacts with required amidation reagent at 100-160 ℃ for 3-20 hours; then adding carboxylation reagent ZR 3 COOM continuously reacts for 2 to 20 hours at the temperature of between 50 and 100 ℃ to obtain the long-carbon-chain betaine surfactant shown in the formula (I); wherein, long carbon chain fatty acid methyl ester: amidation reagent: the molar ratio of carboxylation reagent is 1: (1-3): (1-4); z is selected from any one of hydrogen, hydroxyl, halogen and amino, and M is selected from any one of alkali metal, alkaline earth metal and ammonium ion;
b) Respectively dissolving organic acid salt and the amphoteric surfactant obtained according to the step a) into water, and then adding the organic acid salt and the amphoteric surfactant into the water according to a molar ratio of (1: 0.1 To (1: 10 Mixing uniformly to obtain the surfactant composition.
In the above technical scheme, in the step a), the preferable amidation reagent is NH 2 -R 2 -N(CH 3 ) 2 (ii) a The preferred range of the molar ratio of the amphoteric surfactant to the organic acid salt in the step b) is (1: 0.1 To (1: 10).
The technical scheme adopted by the invention for solving the technical problem is as follows: the application of the viscoelastic surfactant composition in oil displacement of oil fields is one of the technical problems.
The technical scheme adopted by the invention is as follows: the composition of the viscoelastic surfactant in any one of the technical schemes is applied to oil displacement in oil fields. The oil reservoir temperature is preferably 60-100 ℃. The oil displacement system has no special limitation on the permeability in an oil reservoir, and can achieve a good oil displacement effect, but the oil displacement system has outstanding technical difficulty in the field at medium and low permeability in the oil reservoir, and from the angle, the oil displacement system is particularly suitable for high-temperature medium and low permeability oil reservoirs, such as the oil reservoir temperature in the oil reservoir is 85 ℃, and the permeability is 30 millidarcy.
By adopting the technical scheme of the invention, the surfactant composition adopted in the tertiary oil recovery process has high interfacial activity: the composite surfactant composition still has the mineralization degree of 3 ten thousand mg/L and the calcium and magnesium ion content of 400mg/L in the sauerkraut field water under the condition that the using amount of the composite surfactant composition is 0.01-0.6 w.t%Can form 10 with underground crude oil -3 ～10 -4 Ultra-low interfacial tension of milli-newtons per meter; the oil washing capacity is strong, and the recovery ratio can be improved to 14.9%; the surfactant composition has the advantages of simple system and the like, and obtains better technical effect.
The invention is further illustrated by the following examples.
Detailed Description
[ example 1 ] A method for producing a polycarbonate
1. Surfactant preparation
(1) Erucamide carboxybetaine amphoteric surfactant (R) 1 ＝C 21 ，R 2 ＝C 3 、R 3 ＝C 2 ) Preparation of
a) Adding 0.5 mol of methyl erucate and a required amount of amidation reagent N, N-dimethyl propane diamine into a reaction kettle, reacting for 8 hours at 140 ℃, starting a vacuum pump, pumping out methanol and excessive N, N-dimethyl propane diamine generated by the reaction to obtain an erucyl tertiary amine product, adding a required amount of sodium chloroacetate, reacting for 9 hours at 75 ℃, recrystallizing and purifying with absolute ethyl alcohol to obtain the long-carbon-chain betaine amphoteric surfactant; wherein the molar ratio of methyl erucate to N, N-dimethyl propane diamine to sodium chloroacetate is 1.
b) Naphthalene sulfonate and the prepared erucamide carboxyl betaine amphoteric surfactant are respectively dissolved in water, stirred for 30 minutes to prepare an aqueous solution, and then the surfactants are uniformly mixed according to the molar ratio of the amphoteric surfactant to the organic acid salt of 1.
2. Evaluation of surfactant Properties
a) Viscosity determination
Adopting a Brookfield DV-III viscometer at 85 deg.C and 7.34S -1 Under the conditions, the results of measuring the viscosity of the oil displacement agent with the concentration of 0.3 percent and the field water (shown in table 3) of the oil field of shaqi of Jiangsu province are shown in table 2.
b) Evaluation of interfacial tension
The results of measuring the interfacial tension between the oil-displacing agent of 0.1% concentration and the dehydrated crude oil of the oil field of Jiangsu shaqi at 85 ℃ and 6000 rpm by using a TX-500C rotary drop interfacial tension meter manufactured by Texas university, USA, are shown in Table 2.
c) Evaluation of oil displacement experiment
According to the test of the physical simulated oil displacement effect of the composite oil displacement system in the SY/T6424-2000 composite oil displacement system performance test method, a simulated oil displacement experiment is carried out on a rock core with the length of 30cm, the diameter of 2.5cm and the permeability of 30 millidarcy at 87 ℃. Firstly, water flooding is carried out until the water content is 98%, after the water flooding is finished, the oil displacement agent with the concentration of 0.3% is injected by 0.3pv (core pore volume), then the water flooding is carried out until the water content is 100%, and the result of improving the crude oil recovery ratio is shown in table 2.
[ example 2 ]
1. Surfactant preparation
(1) Triacontanoic acid amide carboxybetaine amphoteric surfactant (R) 1 ＝C 29 ，R 2 ＝C 2 、R 3 ＝C 2 ) Preparation of
a) Adding 0.5 mol of long-carbon-chain methyl triacontanoate and required amount of amidation reagent N, N-dimethylethylenediamine into a reaction kettle, reacting for 6 hours at 130 ℃, starting a vacuum pump, pumping out methanol and excessive N, N-dimethylethylenediamine generated by the reaction to obtain a triacontanoic acyl tertiary amine product, adding required amount of sodium chloroacetate, reacting for 15 hours at 85 ℃, and recrystallizing and purifying by absolute ethyl alcohol to obtain the long-carbon-chain betaine surfactant; wherein the molar ratio of methyl triacontanoate to N, N-dimethylethylenediamine to sodium chloroacetate is 1.
b) Naphthalene sulfonate and the triacontanoic amide carboxyl betaine amphoteric surfactant prepared by the method are respectively dissolved in water, stirred for 30 minutes to prepare an aqueous solution, and then the surfactants are uniformly mixed according to the molar ratio of the amphoteric surfactant to the organic acid salt of 1.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 3 ]
1. Surfactant preparation
(1) Pelargonic acid amide carboxybetaine amphoteric surfactant (R) 1 ＝C 8 ，R 2 ＝C 3 、R 3 ＝C 3 ) Preparation of
a) Adding 0.5 mol of methyl nonanoate and a required amount of amidation reagent N, N-dimethylpropylene diamine into a reaction kettle, reacting for 10 hours at 135 ℃, starting a vacuum pump, pumping out methanol and excessive N, N-dimethylpropylene diamine generated by the reaction to obtain a nonanoic acid acyl tertiary amine product, adding a required amount of beta-sodium chloropropionate, reacting for 10 hours at 75 ℃, and recrystallizing and purifying by absolute ethyl alcohol to obtain a long-carbon-chain betaine surfactant; wherein the molar ratio of methyl nonanoate to N, N-dimethylpropylenediamine to beta-sodium chloropropionate is 1.
b) The naphthalene sulfonate and the nonanoic acid amide carboxyl betaine amphoteric surfactant prepared by the method are respectively dissolved in water, stirred for 30 minutes to prepare an aqueous solution, and then the surfactants are uniformly mixed according to the molar ratio of the amphoteric surfactant to the organic acid salt of 1.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 4 ]
1. Surfactant preparation
(1) Lauric acid amide carboxybetaine amphoteric surfactant (R) 1 ＝C 11 ，R 2 ＝C 3 、R 3 ＝C 3 ) Preparation of (2)
a) Adding 0.5 mol of methyl laurate and required amount of amidation reagent N, N-dimethyl propane diamine into a reaction kettle, reacting for 10 hours at 140 ℃, starting a vacuum pump, pumping out methanol and excessive N, N-dimethyl propane diamine generated by the reaction to obtain a lauric acid acyl tertiary amine product, adding required amount of beta-sodium chloropropionate, reacting for 10 hours at 75 ℃, and recrystallizing and purifying with absolute ethyl alcohol to obtain the long-carbon-chain betaine surfactant; wherein the molar ratio of methyl laurate to N, N-dimethylpropylenediamine to beta-sodium chloropropionate is 1.
b) Respectively dissolving naphthalene sulfonate and the lauric acid amide carboxyl betaine amphoteric surfactant prepared by the invention in water, stirring for 30 minutes to prepare an aqueous solution, and then uniformly mixing the surfactants according to the molar ratio of the amphoteric surfactant to the organic acid salt of 1.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ example 5 ] A method for producing a polycarbonate
1. Preparation of surfactants
Erucamide carboxybetaine amphoteric surfactant in example 1, lauric acid amide carboxybetaine amphoteric surfactant in example 4, and naphthalene sulfonate were dissolved in water, respectively, and stirred for 30 minutes to prepare an aqueous solution, and then the surfactants were mixed uniformly in a molar ratio of erucamide carboxybetaine amphoteric surfactant, pelargonic acid amide carboxybetaine amphoteric surfactant, and organic acid salt of 0.5.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. For comparison, the compositions of the oil-displacing agents are shown in Table 1, and the evaluation results are shown in Table 2.
[ example 6 ] A method for producing a polycarbonate
1. Surfactant preparation
Erucamide carboxybetaine amphoteric surfactant in example 1, pelargonic acid amide carboxybetaine amphoteric surfactant in example 3, and naphthalenesulfonate were dissolved in water, respectively, and stirred for 30 minutes to prepare an aqueous solution, and then the surfactants were uniformly mixed according to a molar ratio of erucamide carboxybetaine amphoteric surfactant, pelargonic acid amide carboxybetaine amphoteric surfactant, and organic acid salt of 0.5.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 1 ]
1. Surfactant preparation
Respectively dissolving naphthalene sulfonate and docosyl carboxyl betaine amphoteric surfactants in water, stirring for 30 minutes to prepare an aqueous solution, and uniformly mixing the surfactants according to the molar ratio of the amphoteric surfactants to organic acid salts of 1 to obtain the viscoelastic surfactant composition.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 2 ]
1. Surfactant preparation
According to the method described in patent CN103242816B, the surfactant of the following structure is synthesized: c 11 H 23 CON(CH 2 CH 2 OH) 2 Respectively dissolving naphthalene sulfonate and a synthetic surfactant in water, stirring for 30 minutes to prepare an aqueous solution, and then uniformly mixing the surfactant according to the molar ratio of the synthetic surfactant to the organic acid salt of 1.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. For comparison, the compositions of the oil-displacing agents are shown in Table 1, and the evaluation results are shown in Table 2.
[ COMPARATIVE EXAMPLE 3 ]
1. Surfactant preparation
Respectively dissolving the erucamide carboxybetaine amphoteric surfactant in example 2 and the pelargonic acid amide carboxybetaine amphoteric surfactant in example 6 in water, stirring for 30 minutes to prepare an aqueous solution, and uniformly mixing the erucamide carboxybetaine amphoteric surfactant and the pelargonic acid amide carboxybetaine amphoteric surfactant according to a molar ratio of 1.
2. Evaluation of surfactant Properties
The performance evaluation method was the same as in example 1 except that the oil-displacing agent composition was different. The compositions of the oil-displacing agents are shown in Table 1 for comparison, and the evaluation results are shown in Table 2.
TABLE 1 compositions of surfactant compositions in examples and comparative examples
TABLE 2 evaluation of oil-displacing agent Performance in examples and comparative examples
| Viscosity (mPa.s) | Interfacial tension (mN/m) | Enhanced recovery ratio% | |
| Example 1 | 20.1 | 0.00086 | 14.0 |
| Example 2 | 15.2 | 0.0062 | 13.3 |
| Example 3 | 15.0 | 0.0089 | 12.1 |
| Example 4 | 15.7 | 0.0082 | 12.0 |
| Example 5 | 20.5 | 0.00037 | 14.9 |
| Example 6 | 19.9 | 0.00060 | 14.5 |
| Comparative example 1 | 8.5 | 0.013 | 7.5 |
| Comparative example 2 | 2.5 | 0.017 | 5.0 |
| Comparative example 3 | 9.0 | 0.0018 | 6.9 |
TABLE 3 field Water of Jiangsu Odong san Qi
| Unit of | Na + +K + | Mg 2+ | Ca 2+ | Cl - | SO 4 2- | HCO 3 - | TDS |
| mg/L | 8730.8 | 154 | 220 | 10224 | 1507.7 | 5152.5 | 25830 |
Claims (6)
1. A viscoelastic surfactant composition for oil displacement,comprises amphoteric surfactant and organic acid salt; the molar ratio of the amphoteric surfactant to the organic acid salt is 1:0.1 to 1:10; the amphoteric surfactant is selected from R shown as a formula (I 1 Is C 21 At least one of the long carbon chain amphoteric surfactants of (a) and R represented by the formula (I') (II) 1 Is C 8 、C 11 A combination of at least one of the short carbon chain amphoteric surfactants of (a); the organic acid salt is selected from amino-substituted naphthalene sulfonate;
in the formula (I'), said R 2 Is C 2 ～C 3 Alkylene of (A), R 3 Is C 1 ～C 3 An alkylene group of (a).
2. The surfactant composition according to claim 1, characterized in that the composition comprises water.
3. The method for preparing the viscoelastic surfactant composition for oil displacement according to any one of claims 1 to 2, comprising the steps of:
a) Fatty acid or ester thereof reacts with required amidation reagent at 100-160 ℃ for 3-20 hours; then adding carboxylation reagent ZR 3 COOM continuously reacts for 2 to 20 hours at the temperature of between 50 and 100 ℃ to obtain the amphoteric surfactant shown in the formula (I); wherein, fatty acid methyl ester: amidation reagent: the molar ratio of carboxylation reagent is 1: (1-3): (1-4); z is selected from any one of hydrogen, hydroxyl, halogen and amino, and M is selected from any one of alkali metal, alkaline earth metal and ammonium ions;
b) Respectively dissolving organic acid salt and the amphoteric surfactant obtained in the step a) into water, and then mixing the organic acid salt and the amphoteric surfactant in a molar ratio of (1: 0.1 To (1: 10 Mixing evenly to obtain the viscoelastic surfactant composition for oil displacement.
4. Use of the viscoelastic surfactant for flooding according to any one of claims 1 to 2 in oil field flooding.
5. The use of a viscoelastic surfactant according to claim 4 for oil displacement in oil fields, characterized in that the reservoir to which the use is applied is a hypotonic reservoir.
6. The use of the viscoelastic surfactant according to claim 5 in oil displacement in oil fields, characterized in that the temperature of the low-permeability reservoir is 60-100 ℃.
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