Polymer thickening agent, preparation method thereof and prepared fracturing fluid

By designing polymer monomers with rigid ring structures and polysulfonic acid groups, and combining them with hydrophobic alkyl chains and physical crosslinking agents, a fracturing fluid with shear resistance, temperature resistance, and salt resistance was prepared. This solved the problems of insufficient temperature resistance, shear resistance, and proppant carrying capacity of existing fracturing fluids, and achieved safer gel breaking and lower reservoir damage.

CN121851252APending Publication Date: 2026-04-14张佑明
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Patent Information

Application Number
CN202311699377.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-12-12
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing fracturing fluid thickeners have shortcomings in terms of temperature resistance, shear resistance, salt resistance, and proppant carrying capacity. Furthermore, the residue after gel breaking can easily clog fractures, affecting the fracturing effect.

Method used

By using polymer thickeners, designing polymer monomers with rigid ring structures, polysulfonic acid groups, and quaternary ammonium salt structures, and adding hydrophobic alkyl chains, combined with physical crosslinking agents, fracturing fluids that are resistant to shear, temperature, and salt can be prepared.

Benefits of technology

It improves the viscosity-enhancing properties of fracturing fluid, reduces the acid-rock reaction rate, enhances sand-carrying capacity, leaves less residue after gel breaking, is safe and environmentally friendly, and has broad application prospects.

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Abstract

The invention provides a polymer thickening agent, a preparation method thereof and fracturing fluid prepared from the polymer thickening agent, and belongs to the technical field of fracturing fluid. The invention relates to a water-soluble polymer, which is prepared from a polymer monomer, acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and 1-vinyl-2-pyrrolidone according to a mass ratio of (111-218): (21-36): (16-23): (41-52). The polymer thickening agent prepared by the invention has better tackifying performance, shearing resistance, salt resistance, excellent temperature resistance, good sand-carrying performance and better acid resistance, reduces the acid rock reaction rate, improves the penetration depth of acid etching cracks, is non-toxic, safe and environment-friendly, is safer in gel breaking and lower in damage, and has a wide application prospect.
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