Carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in clay stabilizer

Abstract

The invention discloses carboxylic acid higher alcohol ester-trimethyl ammonium chloride and application thereof in a clay stabilizer. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride has double functions of oil displacement and swelling prevention, is particularly suitable for a low-permeability and water-sensitive crude oil reservoir, and consists of the following main components in percentage by mass: 10 to 30 percent of carboxylic acid higher alcohol ester-trimethyl ammonium chloride, 1 to 20 percent of trimethylamine hydrochloride and 50 to 90 percent of water. The carboxylic acid higher alcohol ester-trimethyl ammonium chloride is realized by the technical scheme of: adding an excessive trimethylamine aqueous solution and alpha-chlorinated fatty acid into a pressure reaction kettle; under the condition of the stirring, controlling the reaction temperature to between 50 and 100 DEG C, the reaction pressure to be between 1 and 0.2 MPa, and the reaction time to be between 3 and 5 hours; after the reaction is finished, reducing the temperature to between 40 and 50 DEG C; dripping 30 percent hydrochloric acid into a reaction solution so as to control the pH value of the reaction solution to between 6 and 8; and then diluting the reaction solution to certain concentration by using clear water to obtain an oil displacing type surfactant used for preventing swelling.

Description

technical field [0001] The invention relates to carboxylic acid higher carbon alcohol ester group trimethyl ammonium chloride and its application in clay stabilizer. Background technique [0002] Domestic oilfield reservoirs contain more or less clay minerals. Due to the high water sensitivity of clay minerals, during water injection, acidification, and fracturing development, these clays will swell when they encounter water or water-based substances. Then further dispersed into fine particles. Swelling of clay and dispersion of particles can reduce the permeability of the formation or block the passage of the wellbore, resulting in a significant loss of well production. At present, domestic oil fields mainly use cationic polymer clay anti-swelling stabilizer as the main method for low-permeability and water-sensitive oil layers. Since the cationic polymer dissociates in water and hydrates into cations with certain surface activity, it is adsorbed on the clay surface and c...

AI Technical Summary

Problems solved by technology

[0004] Simple mixing of clay anti-swelling stabilizer and oil-displacing agent to achieve both anti-swelling and oil-displacing properties. In addition to poor product stability and low efficiency, the application cost is relatively high

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