Amphoteric ionic polymer water base fracturing fluid thickening agent and preparation method thereof

Abstract

The invention relates to an amphoteric ionic polymer water base fracturing fluid thickening agent and a preparation method of the amphoteric ionic polymer water base fracturing fluid thickening agent, and belongs to the technical field of propping agent fracturing fluid used for oil and gas reservoir volume increase and injection increasing measures. The amphoteric ionic polymer water base fracturing fluid thickening agent is prepared through copolymerization of alkyl group acrylic amide, acrylic amide, 2-acrylic amide group-2-methyl propane sulfonic acid sodium aqueous solution, cationic monomers, vinyl monomers and polymerizable surface active agent monomers. The amphoteric ionic polymer water base fracturing fluid thickening agent and the preparation method of the amphoteric ionic polymer water base fracturing fluid thickening agent have the advantages that raw materials used for the amphoteric ionic polymer water base fracturing fluid thickening agent are all industrial products, purification treatment is not needed before a reaction, a complexing agent is added so that polymerization of the complexing agent and an initiating agent can be initiated at an appropriate temperature, and the preparation technology is simple; due to the fact that the surface active agent monomers are added, an obtained polymer has a hydrophobic association function and is higher in shearing stability, easy to dissolve, free of pollution and harm and good in sand carrying performance; and the amphoteric ionic polymer water base fracturing fluid thickening agent can be resistant to the high temperature of 180 DEG C, is suitable for fracturing of high temperature strata, has high shearing-resistant performance to meet the requirement of high-flow fracturing construction, has high sand carrying performance and no-residue performance, and causes no harm to reservoir strata.

Description

Technical field: [0001] The invention relates to a zwitterionic polymer water-based fracturing fluid thickener and a preparation method thereof, and belongs to the technical field of proppant fracturing fluids for oil and gas reservoir production enhancement and injection enhancement measures. technical background: [0002] In the middle and late stages of oilfield development, hydraulic fracturing of subsurface formations is a known method of increasing the permeability of subsurface formations while recovering petroleum product substances, and is one of the most effective production stimulation measures. Due to the low porosity and permeability of the rock formation, it cannot be put into production without fracturing. In this method, a viscous liquid fracturing fluid is poured into the wellbore and pressure is applied to cause the fracture. The proppant in the fluid keeps the fracture open . Thickener is one of the essential substances in fracturing construction. Before ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art, such as high content of water-insoluble matter in the thickener, weak thickening ability, unsatisfactory salt resistance, shear resistance and temperature resistance, and provide zwitterionic polymerization Water-based fracturing fluid thickener; Another object is to provide the preparation method of the above-mentioned zwitterionic polymer water-based fracturing fluid thickener

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