A temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application

A surfactant, temperature and salt resistance technology, applied in the preparation of sulfonic acid, the preparation of carboxylic acid amides, chemical instruments and methods, etc., can solve the problems of complex fracturing fluid system composition, inconvenient on-site fluid preparation, poor temperature resistance, etc. , to achieve the effect of excellent suspended sand performance, low cost and easy reaction

Active Publication Date: 2021-11-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned problems in the prior art, the present invention provides a temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application, in which sulfonate groups, ultra-long hydrophobic chains and cations are introduced into surfactant molecules, and then Compound it with counter ion salt to obtain clean fracturing fluid, which has excellent sand suspension performance, temperature and shear resistance and salt resistance, simple on-site preparation, low cost, automatic gel breaking, and little damage to the formation. Effectively solve the problems of poor temperature resistance, poor stability, complex composition of fracturing fluid system and inconvenient on-site fluid mixing

Method used

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  • A temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application
  • A temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application
  • A temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application

Examples

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Embodiment 1

[0044] A preparation method of a temperature-resistant and salt-resistant gemini amphoteric surfactant, comprising the following steps:

[0045] (1) Dissolve 100mmol of oleic amidopropyldimethylamine in 250mL of isopropanol, then add 120mmol of hydrochloric acid, stir at room temperature for 10min, then add 150mmol of epichlorohydrin dropwise, and react at 50°C for 3h , evaporated to remove solvent and excess with epichlorohydrin to obtain intermediate one;

[0046] (2) Add 120mmol of taurine, 250mL of distilled water and 200mL of isopropanol to intermediate one obtained in step (1), then add 130mmol of sodium bicarbonate, reflux at a temperature of 50°C for 10h, then add 300mL of acetone, and Standing at ℃ for 3h, intermediate 2 was obtained;

[0047] (3) Add 65mmol of 1,4-dibromobutane and 200mL of ethanol to intermediate 2 obtained in step (2), then add 130mmol of sodium bicarbonate, react at 60°C for 12h, then add 300mL of acetone, 3°C Recrystallize at high temperature f...

Embodiment 2

[0050] A preparation method of a temperature-resistant and salt-resistant gemini amphoteric surfactant, comprising the following steps:

[0051] (1) Dissolve 100mmol of erucamidopropyldimethylamine in 250mL of ethanol, then add 120mmol of hydrochloric acid, stir at room temperature for 10min, then add 150mmol of epichlorohydrin dropwise, react at 60°C for 2h, evaporate Remove the solvent and excess with epichlorohydrin to obtain intermediate one;

[0052] (2) Add 120mmol of taurine, 300mL of distilled water and 200mL of isopropanol to intermediate one obtained in step (1), then add 130mmol of sodium bicarbonate, reflux at a temperature of 50°C for 8h, then add 300mL of acetone, and Standing at ℃ for 3h, intermediate 2 was obtained;

[0053] (3) Add 70mmol of dibromoethane and 200mL of ethanol to intermediate 2 obtained in step (2), then add 130mmol of sodium bicarbonate, react at 50°C for 12h, then add 300mL of acetone, and recrystallize at 3°C After 4 hours, after removing ...

Embodiment 3

[0056] A preparation method of a temperature-resistant and salt-resistant gemini amphoteric surfactant, comprising the following steps:

[0057] (1) Dissolve 100mmol of erucamidopropyldimethylamine in 250mL of ethanol, then add 120mmol of hydrochloric acid, stir at room temperature for 10min, then add 150mmol of epichlorohydrin dropwise, react at 60°C for 2h, evaporate Remove the solvent and excess with epichlorohydrin to obtain intermediate one;

[0058] (2) Add 120mmol of taurine, 300mL of distilled water and 200mL of ethanol to intermediate one obtained in step (1), then add 130mmol of sodium bicarbonate, reflux at 50°C for 9h, then add 300mL of acetone, Stand still for 3h to obtain intermediate 2;

[0059] (3) Add 70mmol of dibromopentane and 200mL of ethanol to intermediate 2 obtained in step (2), then add 120mmol of sodium bicarbonate, react at 50°C for 11h, then add 300mL of acetone, and recrystallize at 3°C After 4 hours, after removing the solvent by evaporation, a ...

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Abstract

The invention provides a temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application, shows its specific structural formula, and provides a preparation method of a temperature-resistant and salt-resistant gemini amphoteric surfactant, and a temperature-resistant and salt-resistant Use of Gemini Amphoteric Surfactants in Cleaning Fracturing Fluids. The present invention introduces sulfonate groups, ultra-long hydrophobic chains and cations into surfactant molecules, and then compound them with counter ion salts to obtain clean fracturing fluid, which has excellent sand suspension performance, temperature resistance and shear resistance and Salt performance, simple on-site preparation, low cost, automatic gel breaking, little damage to the formation, effectively solves the problems of poor temperature resistance, poor stability, complex composition of fracturing fluid system and inconvenient on-site fluid mixing.

Description

technical field [0001] The invention belongs to the technical field of surfactants and their preparation, and in particular relates to a temperature-resistant and salt-resistant gemini amphoteric surfactant and its preparation method and application. Background technique [0002] With the rapid development of drilling technology, oilfield development is gradually oriented towards deep, high-temperature, low-permeability and difficult-to-produce reservoirs. However, due to the harsh downhole environment of deep wells, it is difficult for conventional mining techniques to obtain ideal recovery ratios. Therefore, hydraulic fracturing stimulation has become one of the important methods for the exploitation of unconventional low-permeability reservoirs. As the working fluid in the construction process, the performance of fracturing fluid directly affects the success of the construction and the stimulation effect of the reservoir after fracturing. [0003] The purpose of using f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/22C07C309/14C07C231/12C07C233/38B01F17/24C09K8/68C09K23/24
CPCC07C303/22C07C309/14C07C231/12C09K8/68C09K8/602C09K23/00
Inventor 毛金成杜安琪杨小江林冲毛金桦
Owner SOUTHWEST PETROLEUM UNIV
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