Sulfamic acid type surfactant as well as preparation method and application thereof

Abstract

The invention relates to the technical field of oilfield chemistry, in particular to a sulfamic acid type surfactant as well as a preparation method and application thereof.The sulfamic acid type surfactant is prepared according to the following steps: step one, after fatty amine and a first solvent are mixed, adding a 3-chloro-2-hydroxypropyl sodium sulfonate aqueous solution, and stirring to obtain a first mixture; reacting to obtain 3-(long-chain alkylamino)-2-hydroxypropane-1-sodium sulfonate; and 2, dissolving a required amount of 3-(long-chain alkylamino)-2-hydroxypropane-1-sodium sulfonate in a second solvent, adding a required amount of methyl acrylate, and reacting to obtain the sulfamic acid type surfactant. The sulfamic acid type surfactant disclosed by the invention contains long-chain alkyl, amino, ester group, hydroxyl and sulfonic acid group, so that the sulfamic acid type surfactant has good surface activity and meets the development requirements of oil and gas fields, and the microemulsion cleanup additive prepared by utilizing the sulfamic acid type surfactant has excellent water solubility and surface activity and meets the industrial use standards of non-fluorocarbon cleanup additives.

Description

Technical Field

[0001] This invention relates to the field of oilfield chemical technology, specifically to an aminosulfonic acid type surfactant, its preparation method and application, as well as a method for preparing a microemulsion drainage aid. Background Technology

[0002] Acidizing and fracturing are effective methods for the stimulation of low-permeability reservoirs. After the operations are completed, the fluids that have entered the formation should be promptly returned to the formation to reduce reservoir damage. Flowback assistance is a common method to improve the flowback rate. Adding flowback aids to the stimulation fluid can reduce interfacial tension and increase the contact angle, thereby reducing capillary resistance and allowing the stimulation fluid to be smoothly returned to the formation, preventing it from clogging and damaging the formation, and improving the reservoir's conductivity. This method is characterized by low cost, ease of operation, and high flowback rate.

[0003] Currently, there are many types of fracturing and acidification aids used both domestically and internationally, but most are prepared by compounding fluorocarbon surfactants with other surfactants. Chinese patent document CN102127414A discloses a microemulsion-type fracturing and acidification aid and its preparation method. It uses the green surfactant sodium fatty acid methyl ester sulfonate and biodiesel as main raw materials, compounded with n-butanol, sodium chloride, etc., to prepare a medium-phase microemulsion. This microemulsion is then combined with sodium perfluorononylbenzene sulfonate and Span 80 to obtain the fracturing aid, achieving a fracturing aid rate of 87.07%. Chinese patent document CN109575903A discloses a formulation and preparation method of a fracturing aid containing fluorocarbon compounds. This aid is prepared by compounding perfluoroalkyl butyramide, cationic surfactant, fluorocarbon surfactant, alkylphenol polyoxyethylene ether, fatty alcohol, and sodium sulfonate. It exhibits good salt, acid, and temperature resistance, significantly reduces interfacial tension, and achieves rapid and efficient fracturing and backflow prevention. All of the above drainage aids use fluorocarbon surfactants as the main component and low molecular weight alcohols such as methanol, ethanol, and n-butanol as solubilizers.

[0004] Fluorocarbon surfactants are not only expensive but also biotoxic; low-molecular-weight alcohols are not only toxic but also flammable and explosive, posing safety risks. Therefore, developing green and environmentally friendly emission-aiding agent systems has become an urgent problem to be solved. Summary of the Invention

[0005] This invention provides an aminosulfonic acid-based surfactant and its preparation method, which overcomes the shortcomings of the prior art and can effectively solve the problem that the surfactants used in existing fracturing operations are difficult to degrade and have high biotoxicity.

[0006] One of the technical solutions of this invention is achieved through the following measures: an aminosulfonic acid type surfactant with the following chemical structural formula: Where R is C12 To C 16 Aliphatic hydrocarbon groups.

[0007] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The above-mentioned aminosulfonic acid type surfactants were prepared according to the following steps: Step 1: After mixing the fatty amine with the first solvent, add an aqueous solution of sodium 3-chloro-2-hydroxypropyl sulfonate to react and obtain sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate. Step 2: Dissolve the required amount of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate in a second solvent, add the required amount of methyl acrylate, and after the reaction, obtain an aminosulfonic acid type surfactant.

[0008] In step one above, the reaction temperature is 75℃ to 85℃, and the reaction time is 8h to 24h.

[0009] In step one above, the pH of the reaction system is adjusted to between 7.0 and 7.5 during the reaction.

[0010] In step one above, the molar ratio of fatty amine to sodium 3-chloro-2-hydroxypropylsulfonate is 1.1 to 1.3:1.

[0011] The first solvent is anhydrous ethanol, and the second solvent is methanol.

[0012] In step two above, the molar ratio of methyl acrylate to sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate is 1.1 to 1.3:1.

[0013] In step two above, the reaction is a reflux reaction, and the reaction time is 4 to 12 hours.

[0014] The second technical solution of the present invention is achieved through the following measures: a method for preparing an aminosulfonic acid type surfactant, comprising the following steps: Step 1: After mixing the fatty amine with the first solvent, add an aqueous solution of sodium 3-chloro-2-hydroxypropyl sulfonate to react and obtain sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate. Step 2: Dissolve the required amount of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate in a second solvent, add the required amount of methyl acrylate, and after the reaction, obtain an aminosulfonic acid type surfactant.

[0015] The third technical solution of the present invention is achieved through the following measures: the application of an aminosulfonic acid type surfactant in reservoir fracturing and stimulation construction.

[0016] The fourth technical solution of the present invention is achieved through the following measures: A method for preparing a microemulsion drainage aid includes the following steps: The required amount of aminosulfonic acid surfactant is dissolved in kerosene to obtain the first mixture; Dissolve the required amount of sodium fatty alcohol polyoxyethylene ether carboxylate in water to obtain a second mixture; The second mixture is added to the first mixture, stirred and mixed, and after emulsification, it is allowed to stand and separate into layers. The lower microemulsion phase is taken out to obtain the microemulsion drainage aid.

[0017] The following are further optimizations and / or improvements to the fourth technical solution of the invention described above: The mass ratio of the above-mentioned aminopropanesulfonic acid type surfactant, kerosene, sodium fatty alcohol polyoxyethylene ether carboxylate and water is 2 to 10:50 to 100:0 to 5:50 to 100.

[0018] The stirring speed is from 500 r / min to 3000 r / min.

[0019] This invention provides an aminosulfonic acid-based surfactant, its preparation method, and its application. This surfactant contains long-chain alkyl, amino, ester, hydroxyl, and sulfonic acid groups, giving it excellent surface activity to meet the needs of oil and gas field development. The method is reliable in principle, simple to operate, and operates under mild conditions, making it suitable for industrial production. The microemulsion drainage aid prepared using the aminosulfonic acid-based surfactant exhibits superior water solubility and surface activity, meeting the industry standards for non-fluorocarbon drainage aids. Detailed Implementation

[0020] This invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solution of this invention and the actual situation. Unless otherwise specified, all chemical reagents and chemical products mentioned in this invention are well-known and commonly used chemical reagents and chemical products in the prior art; unless otherwise specified, all percentages in this invention are mass percentages; room temperature in this invention generally refers to a temperature between 15°C and 25°C, and is generally defined as 25°C.

[0021] The present invention will be further described below with reference to embodiments: Example 1: The chemical structural formula of this aminosulfonic acid type surfactant is as follows: Where R is C 12 To C 16 Aliphatic hydrocarbon groups.

[0022] Example 2: As an optimization of the above example, the aminosulfonic acid surfactant was prepared according to the following steps: Step 1: After mixing the fatty amine with the first solvent, add an aqueous solution of sodium 3-chloro-2-hydroxypropyl sulfonate to react and obtain sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate. Step 2: Dissolve the required amount of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate in a second solvent, add the required amount of methyl acrylate, and after the reaction, obtain an aminosulfonic acid type surfactant.

[0023] Example 3: As an optimization of the above example, in step one, the reaction temperature is 75°C to 85°C and the reaction time is 8h to 24h.

[0024] Example 4: As an optimization of the above example, in step one, the pH of the reaction system is adjusted to between 7.0 and 7.5 during the reaction. Specifically, during the reaction of sodium 3-chloro-2-hydroxypropylsulfonate and aliphatic amine, sodium hydroxide solution is used to adjust the pH so that the reaction system remains weakly alkaline at all times.

[0025] Example 5: As an optimization of the above example, in step one, the molar ratio of fatty amine to sodium 3-chloro-2-hydroxypropylsulfonate is 1.1 to 1.3:1.

[0026] Example 6: As an optimization of the above examples, the first solvent is anhydrous ethanol and the second solvent is methanol.

[0027] Example 7: As an optimization of the above example, in step two, the molar ratio of methyl acrylate to sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate is 1.1 to 1.3:1.

[0028] Example 8: As an optimization of the above example, in step two, the reaction is a reflux reaction, and the reaction time is 4h to 12h.

[0029] The aminosulfonic acid type surfactant of the present invention is prepared by substitution and Michael addition reaction. The chemical reaction process of the preparation method is as follows: (1) Preparation of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate: (2) Preparation of aminosulfonic acid type surfactants: In the above structural formula, R is C 12 To C 16 Aliphatic hydrocarbon groups.

[0030] Example 9: Application of this aminosulfonic acid surfactant in reservoir fracturing and stimulation operations.

[0031] Example 10: The preparation method of this microemulsion drainage aid includes the following steps: The required amount of aminosulfonic acid surfactant is dissolved in kerosene to obtain the first mixture; Dissolve the required amount of sodium fatty alcohol polyoxyethylene ether carboxylate in water to obtain a second mixture; The second mixture is added to the first mixture, stirred and mixed, and after emulsification, it is allowed to stand and separate into layers. The lower microemulsion phase is taken out to obtain the microemulsion drainage aid.

[0032] Example 11: As an optimization of Example 11 above, the mass ratio of aminopropanesulfonic acid surfactant, kerosene, sodium fatty alcohol polyoxyethylene ether carboxylate and water is 2 to 10:50 to 100:0 to 5:50 to 100.

[0033] Example 12: As an optimization of Example 11 above, the stirring speed is 500 r / min to 3000 r / min.

[0034] Example 13: (1) Preparation of aminosulfonic acid type surfactants: Step 1: Mix 0.13 mol of dodecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to be slightly alkaline (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter and dry to obtain sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.6%.

[0035] Step 2: Dissolve 0.05 mol of sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, heat to reflux until homogeneous, slowly add 0.065 mol of methyl acrylate, reflux for 12 h, and rotary evaporate to obtain sodium 3-(dodecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, an aminosulfonic acid type surfactant, with a yield of 98.8%.

[0036] (2) Preparation of microemulsion drainage aid: Dissolve 10 parts of sodium 3-(dodecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene, stir at 1500 r / min, slowly add 100 parts of tap water, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0037] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: at a concentration of 0.3% by mass, the surface tension is 24.483 mN / m and the interfacial tension is 0.007 mN / m, which meets the industry standards for non-fluorocarbon drainage aids.

[0038] Example 14: (1) Preparation of aminosulfonic acid type surfactants Step 1: Mix 0.12 mol of dodecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to be slightly alkaline (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter and dry to obtain sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.4%.

[0039] Step 2: Dissolve 0.05 mol of sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, reflux until homogeneous, slowly add 0.065 mol of methyl acrylate, reflux for 6 h, and rotary evaporate to obtain the aminosulfonic acid surfactant sodium 3-(dodecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, with a yield of 98.8%.

[0040] (2) Preparation of microemulsion drainage aid Dissolve 9.5 parts of sodium 3-(dodecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene and stir until homogeneous to obtain the first mixture. Dissolve 0.5 parts of sodium fatty alcohol polyoxyethylene ether carboxylate in 100 tap water and stir until homogeneous to obtain a second mixture; Start stirring at 1500 r / min, slowly drip the second mixture into the first mixture, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0041] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: surface tension of 24.061 mN / m and interfacial tension of 0.197 mN / m at a concentration of 0.3% by mass, which meets the industry standards for non-fluorocarbon drainage aids.

[0042] Example 15: (1) Preparation of aminosulfonic acid type surfactants Step 1: Mix 0.12 mol of dodecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to be slightly alkaline (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter and dry to obtain sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.4%.

[0043] Step 2: Dissolve 0.05 mol of sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, heat to reflux until homogeneous, slowly add 0.06 mol of methyl acrylate, reflux for 6 h, and rotary evaporate to obtain the aminosulfonic acid surfactant sodium 3-(dodecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, with a yield of 98.8%.

[0044] (2) Preparation of microemulsion drainage aid Dissolve 9.5 parts of sodium 3-(dodecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene and stir until homogeneous to obtain the first mixture. Dissolve 0.5 parts of sodium fatty alcohol polyoxyethylene ether carboxylate in 100 tap water and stir until homogeneous to obtain a second mixture; Start stirring at 1500 r / min, slowly drip the second mixture into the first mixture, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0045] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: surface tension of 23.961 mN / m and interfacial tension of 0.264 mN / m at a concentration of 0.3% by mass, which meets the industry standards for non-fluorocarbon drainage aids.

[0046] Example 16: (1) Preparation of aminosulfonic acid type surfactants Step 1: Mix 0.11 mol of dodecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to a slightly alkaline state (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter, and dry to obtain sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.0%.

[0047] Step 2: Dissolve 0.05 mol of sodium 3-(dodecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, heat to reflux until homogeneous, slowly add 0.06 mol of methyl acrylate, reflux for 4 h, and rotary evaporate to obtain the aminosulfonic acid surfactant sodium 3-(dodecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, with a yield of 97.9%.

[0048] (2) Preparation of microemulsion drainage aid Dissolve 9.0 parts of sodium 3-(dodecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene and stir until homogeneous to obtain the first mixture. Dissolve 1.0 part of sodium fatty alcohol polyoxyethylene ether carboxylate in 100 ml of tap water and stir until homogeneous to obtain a second mixture. Start stirring at 1500 r / min, slowly drip the second mixture into the first mixture, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0049] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: at a concentration of 0.3% by mass, the surface tension is 23.425 mN / m and the interfacial tension is 0.548 mN / m, which meets the industry standards for non-fluorocarbon drainage aids.

[0050] Example 17: (1) Preparation of aminosulfonic acid type surfactants Step 1: Mix 0.12 mol of tetradecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to be slightly alkaline (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter and dry to obtain sodium 3-(tetradecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.2%.

[0051] Step 2: Dissolve 0.05 mol of sodium 3-(tetradecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, heat to reflux until homogeneous, slowly add 0.06 mol of methyl acrylate, reflux for 6 h, and rotary evaporate to obtain sodium 3-(tetradecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, an aminosulfonic acid type surfactant, with a yield of 98.1%.

[0052] (2) Preparation of microemulsion drainage aid Dissolve 9.0 parts of sodium 3-(tetradecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene and stir until homogeneous to obtain the first mixture. Dissolve 1.0 part of sodium fatty alcohol polyoxyethylene ether carboxylate in 100 ml of tap water and stir until homogeneous to obtain a second mixture. Start stirring at 1500 r / min, slowly drip the second mixture into the first mixture, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0053] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: at a concentration of 0.3% by mass, the surface tension is 23.137 mN / m and the interfacial tension is 0.446 mN / m, which meets the industry standards for non-fluorocarbon drainage aids.

[0054] Example 18: (1) Preparation of aminosulfonic acid type surfactants Step 1: Mix 0.12 mol of hexadecylamine with 200 mL of anhydrous ethanol and stir until homogeneous. Add 0.1 mol of sodium 3-chloro-2-hydroxypropylsulfonate and 20 mL of tap water. Heat to 80 °C and react for 24 h. During this period, use 10% sodium hydroxide solution to adjust the pH to a slightly alkaline state (maintain the pH of the reaction system between 7.0 and 7.5). After stopping the reaction, refrigerate at low temperature, filter, and dry to obtain sodium 3-(hexadecylamino)-2-hydroxypropane-1-sulfonate with a yield of 97.3%.

[0055] Step 2: Dissolve 0.05 mol of sodium 3-(hexadecylamino)-2-hydroxypropane-1-sulfonate in 100 mL of methanol, heat to reflux until homogeneous, slowly add 0.06 mol of methyl acrylate, reflux for 6 h, and rotary evaporate to obtain the aminosulfonic acid surfactant sodium 3-(hexadecyl(3-methoxy-3-oxypropyl)amino)-2-hydroxypropane-1-sulfonate, with a yield of 98.2%.

[0056] (2) Preparation of microemulsion drainage aid Dissolve 9.0 parts of sodium 3-(hexadecyl(3-methoxy-3-oxopropyl)amino)propanesulfonate in 100 parts of kerosene and stir until homogeneous to obtain the first mixture. Dissolve 1.0 part of sodium fatty alcohol polyoxyethylene ether carboxylate in 100 ml of tap water and stir until homogeneous to obtain a second mixture. Start stirring at 1500 r / min, slowly drip the second mixture into the first mixture, emulsify evenly, let stand and separate into layers, take the lower microemulsion phase to obtain the microemulsion drainage aid.

[0057] The indoor test results of the microemulsion drainage aid in this embodiment are as follows: surface tension of 24.007 mN / m and interfacial tension of 0.326 mN / m at a concentration of 0.3% by mass, which meets the industry standards for non-fluorocarbon drainage aids.

[0058] In summary, this invention provides an aminosulfonic acid-based surfactant, its preparation method, and its application. This aminosulfonic acid-based surfactant is biodegradable, non-toxic, environmentally friendly, and possesses superior water solubility, surface activity, and temperature and salt resistance. This invention also provides a method for preparing a microemulsion drainage aid using the aminosulfonic acid-based surfactant as a raw material. The preparation process of this aminosulfonic acid-based surfactant and microemulsion drainage aid involves low reaction temperatures, is safe and reliable, simple to operate, requires minimal equipment, and achieves high yields, making it suitable for industrial production.

[0059] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. An aminosulfonic acid type surfactant, characterized in that... The chemical structural formula is: Where R is C 12 To C 16 Aliphatic hydrocarbon groups.

2. The aminosulfonic acid type surfactant according to claim 1, characterized in that... It is prepared according to the following steps: Step 1: After mixing the fatty amine with the first solvent, add an aqueous solution of sodium 3-chloro-2-hydroxypropyl sulfonate to react and obtain sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate. Step 2: Dissolve the required amount of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate in a second solvent, add the required amount of methyl acrylate, and after the reaction, obtain an aminosulfonic acid type surfactant.

3. The aminosulfonic acid type surfactant according to claim 2, characterized in that... In step one, the reaction temperature is 75°C to 85°C and the reaction time is 8h to 24h; or / and, in step one, the pH of the reaction system is adjusted to between 7.0 and 7.5 during the reaction.

4. The aminosulfonic acid type surfactant according to claim 2 or 3, characterized in that... In step one, the molar ratio of fatty amine to sodium 3-chloro-2-hydroxypropylsulfonate is 1.1 to 1.3:

1.

5. The aminosulfonic acid type surfactant according to any one of claims 2 to 4, characterized in that... The first solvent is anhydrous ethanol, and the second solvent is methanol.

6. The aminosulfonic acid type surfactant according to any one of claims 2 to 5, characterized in that... In step two, the molar ratio of methyl acrylate to sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate is 1.1 to 1.3:1; or / and, in step two, the reaction is a reflux reaction, and the reaction time is 4 h to 12 h.

7. A method for preparing an aminosulfonic acid type surfactant according to claim 1, 3, 4, 5, or 6, characterized in that... Includes the following steps: Step 1: After mixing the fatty amine with the first solvent, add an aqueous solution of sodium 3-chloro-2-hydroxypropyl sulfonate to react and obtain sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate. Step 2: Dissolve the required amount of sodium 3-(long-chain alkylamino)-2-hydroxypropane-1-sulfonate in a second solvent, add the required amount of methyl acrylate, and after the reaction, obtain an aminosulfonic acid type surfactant.

8. The application of an aminosulfonic acid type surfactant according to any one of claims 1 to 6 in reservoir fracturing and stimulation operations.

9. A method for preparing a microemulsion drainage aid using an aminosulfonic acid-type surfactant as a raw material according to any one of claims 1 to 6, characterized in that... Includes the following steps: The required amount of aminosulfonic acid surfactant is dissolved in kerosene to obtain the first mixture; Dissolve the required amount of sodium fatty alcohol polyoxyethylene ether carboxylate in water to obtain a second mixture; The second mixture is added to the first mixture, stirred and mixed, and after emulsification, it is allowed to stand and separate into layers. The lower microemulsion phase is taken out to obtain the microemulsion drainage aid.

10. The method for preparing the microemulsion drainage aid according to claim 9, characterized in that... The mass ratio of aminopropanesulfonic acid surfactant, kerosene, sodium fatty alcohol polyoxyethylene ether carboxylate and water is 2 to 10:50 to 100:0 to 5:50 to 100; or / and, the stirring speed is 500 r / min to 3000 r / min.

Images