High-temperature-resistant degradable temporary plugging agent and fracturing fluid synergistic system and application method

By leveraging the synergistic effect of a core-shell structured pH-responsive temporary plugging agent and acidic fracturing fluid, the problem of controlling the strength and degradation behavior of the temporary plugging agent under high-temperature conditions was solved, achieving efficient plugging and rapid unplugging, making it suitable for fracturing stimulation of complex high-temperature reservoirs.

CN121249337APending Publication Date: 2026-01-02XI'AN PETROLEUM UNIVERSITY
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Patent Information

Application Number
CN202511450034.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-11
Publication Date
2026-01-02

AI Technical Summary

Technical Problem

Existing biodegradable temporary plugging agents cannot simultaneously maintain strength, toughness, and thermal stability under high-temperature conditions. Their degradation behavior passively depends on formation temperature and cannot work synergistically with fracturing fluid systems, leading to high risks of plugging failure or reservoir damage.

Method used

The pH-responsive temporary plugging agent adopts a core-shell structure. The core is composed of materials such as polyethylene glycol, and the outer layer is a blend of polylactic acid and pH-sensitive materials. When used with acidic fracturing fluid, the temporary plugging agent can achieve intelligent response and precise control by controlling the pH value.

Benefits of technology

It achieves strong and tough plugging and rapid degradation of temporary plugging agents under high temperature conditions, broadens the construction window, reduces reservoir damage risk, and improves fracturing efficiency and flowback rate.

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Abstract

The invention provides a high-temperature-resistant degradable temporary plugging agent and fracturing fluid synergistic system and an application method thereof, and the synergistic system maintains a weak acid environment in a construction stage, protects the core strength of the temporary plugging agent to be slowly attenuated, and ensures stable pressure bearing of a plugging layer; in the flow-back stage, a coating layer of the temporary plugging agent is rapidly damaged by injecting a strong acid activating solution, the specific surface area of the temporary plugging agent is rapidly increased, and rapid hydrolysis of an inner core polymer chain is commonly catalyzed by cooperating with high temperature, so that rapid and thorough degradation of the temporary plugging agent is realized. By means of the design, the temporary plugging agent perfectly balances the contradiction between tough plugging in the construction period and rapid plugging removal after construction is completed, the application window of the temporary plugging fracturing technology in a complex high-temperature reservoir is greatly widened, the reservoir damage risk caused by temporary plugging agent residues is effectively reduced, and the fracturing transformation efficiency and the oil and gas well flowback rate are improved.
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