Water-phase suspension fracturing fluid and preparation method thereof

By preparing an aqueous suspension fracturing fluid using modified polyacrylamide as a raw material, the problem of low viscosity of polyacrylamide fracturing fluids under high salinity was solved, achieving high viscosity and rapid gel breaking under high salinity, thus improving the efficiency and effectiveness of fracturing operations.

CN122168261APending Publication Date: 2026-06-09PETROCHINA CO LTD
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Patent Information

Application Number
CN202411799567.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing polyacrylamide fracturing fluids have low viscosity and poor salt resistance under high salinity conditions, and are prone to phase separation, which affects the fracturing effect.

Method used

Modified polyacrylamide was used as raw material, and a flow aid, xanthan gum, suspending agent and highly mineralized water were compounded to prepare an aqueous suspension fracturing fluid. The intermolecular association and solubility were improved by introducing fluorocarbon chains and quaternary ammonium salt groups, and the viscosity was enhanced by using nano-inorganic materials.

Benefits of technology

It maintains high viscosity under high salinity, has a short breaking time, and low viscosity and surface tension of the breaking fluid, meeting industry standards and improving the efficiency and effectiveness of fracturing operations.

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Abstract

The invention relates to the technical field of water-based fracturing fluids, in particular to a water-phase suspension fracturing fluid and a preparation method thereof.The water-phase suspension fracturing fluid is prepared by taking modified polyacrylamide as a raw material and then compounding a cleanup additive, xanthan gum, a suspending agent, organic matter and highly mineralized water, and the water-phase suspension fracturing fluid has high viscosity under high salinity. Meanwhile, the gel breaking time of the gel breaking liquid obtained after the gel breaker is added into the water-phase suspension fracturing liquid is shorter than 3 h, the apparent viscosity of the gel breaking liquid is lower than 5 mPa.s, the surface tension of the gel breaking liquid is lower than 28 mN / m, and the interfacial tension of the gel breaking liquid and kerosene is lower than 2 mN / m, all the requirements of industrial standards are met, and the fracturing construction progress and effect are greatly improved.
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