Preparation method of multifunctional emulsion type drag reducer for shale gas fracturing

Abstract

The invention provides a preparation method of a multifunctional emulsion type drag reducer for shale gas fracturing. The preparation method comprises steps as follows: (1) firstly, an aqueous phase is prepared from water, anionic monomers, nonionic monomers and cationic monomers, the anionic monomers are added to the water, the mixture is neutralized to have the pH of 7 by the aid of a functional base, and then the nonionic monomers, the cationic monomers and an aid are added; (2) an oil phase is prepared from a solvent and an emulsifier which accounts for 5%-20% of the solvent in mass; (3) the aqueous phase and the oil phase are mixed, the water accounts for 10%-60% of the mixture in mass in the aqueous phase and oil phase mixture, high-speed shearing emulsification is performed, and then an initiator is slowly added at the reaction temperature of 20-80 DEG C under protection of nitrogen so as to initiate an emulsion polymerization reaction; (4) after the reaction is ended, a product is cooled to the room temperature, a low-surface-tension reverse phase agent is added, and the multifunctional drag reducer is obtained. The preparation method has the benefits as follows: the anti-swelling ability is outstanding, the discharge aiding effect is good, the drag reducer is multifunctional, and construction is convenient.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a preparation method of a multifunctional emulsion type drag reducer for shale gas fracturing. Background technique [0002] In recent years, the development of unconventional oil and gas resources of shale gas has been carried out rapidly in China, setting off an upsurge of unconventional oil and gas exploitation. The fracturing fluids used in the volume fracturing of tight shale gas reservoirs in the United States and my country at this stage are all so-called "slick water" systems, usually composed of anionic polyacrylamide water-in-oil emulsion drag reducers and drainage aids It is composed of three main agents, clay stabilizer and clay stabilizer. During the continuous mixing process on site, three sets of pipelines are required to meter and pump them to the mixing cage of the sand mixer respectively, and the way of dosing is relatively cumbersome. [0003] Do...

AI Technical Summary

Problems solved by technology

The fracturing fluids used in the volume fracturing of tight shale gas reservoirs in the United States and my country at this stage are all so-called "slick water" systems, usually composed of anionic polyacrylamide water-in-oil emulsion drag reducers and drainage aids It consists of three main agents, clay stabilizer and clay stabilizer. During the continuous mixing process on site, three sets of pipelines are required to meter and pump them to the mixing cage of the sand mixer respectively, and the method of dosing is relatively cumbersome.

[0003] Domestic research on "water-in-oil" emulsion polyacrylamide drag reducer is still in its infancy

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