High-temperature-resistant and viscosity-changing integrated fracturing fluid drag reducer and preparation method thereof

CN122302859APending Publication Date: 2026-06-30CHINA NAT PETROLEUM CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT PETROLEUM CORP
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing slickwater fracturing fluids have low viscosity and poor proppant carrying capacity in medium-deep unconventional oil and gas reservoirs, making it difficult to form an effective fracture network. Furthermore, their temperature resistance is insufficient, affecting the stimulation effect.

Method used

A high-temperature resistant, viscosity-modifying integrated fracturing fluid drag-reducing agent is used. Through the combination of viscosity improver, suspension, demulsifier, and clay stabilizer, a high-molecular polymer network structure is formed, which improves viscosity and temperature and shear resistance.

Benefits of technology

Under high temperature conditions, fracturing fluid has high efficiency in drag reduction, strong sand suspension capacity, high viscosity increase rate, and significantly improved viscosity, which meets the needs of medium and deep oil and gas stimulation and greatly improves reservoir stimulation efficiency by reducing drag.

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Abstract

This invention discloses a high-temperature resistant, viscosity-modifying integrated fracturing fluid drag-reducing agent and its preparation method. The drag-reducing agent comprises the following components by weight: 30-45 parts by weight of a thickener, 49-67 parts by weight of a suspension, 0.5-2.0 parts by weight of a demulsifier and drainage aid, and 1.0-3.0 parts by weight of a clay stabilizer. The thickener is polymerized from acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, and octadecyl methacrylate. The drag-reducing agent provided by this invention has a molecular structure based on the supramolecular aggregation principle, forming a high-molecular polymer containing a large number of strongly hydrophilic groups and a small number of hydrophobic carbon chains. Under low dosage conditions, the polymer exhibits a linear discrete distribution, resulting in a highly efficient drag-reducing effect. Under high dosage conditions, the polymer molecular chains form a highly viscoelastic three-dimensional network structure through hydrophobic association, thereby giving the fracturing fluid strong temperature and shear resistance and sand-suspending capacity.
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