Dual stimulus-responsive supramolecular gel temporary plugging agent and preparation method thereof

Through the dual stimulation-responsive supramolecular gel temporary plugging agent, a tertiary amine surfactant and temperature-responsive autogenic acid form a worm-like micelle structure in the reservoir, solving the problem that the existing gel temporary plugging agent is difficult to control the glue formation time and glue breaking time in the reservoir, achieving rapid sealing and glue breaking, reducing environmental damage, and is suitable for efficient transformation of low-permeability dense reservoirs.

CN120442229APending Publication Date: 2025-08-08SOUTHWEST PETROLEUM UNIV +1
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Patent Information

Application Number
CN202510571556.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-06
Publication Date
2025-08-08

AI Technical Summary

Technical Problem

The glue formation time and glue breaking time of existing temperature-responsive gel temporary plugging agents in the reservoir are difficult to control, and the solvent is harmful to the environment, and the degradation rate and degree of fiber temporary plugging agents are not easy to control. The existing supramolecular gel temporary plugging agents are suitable for a narrow temperature range and small phase change in phase change, making it difficult to meet the efficient transformation needs of low-permeability dense reservoirs.

Method used

A double stimulus-responsive supramolecular gel temporary plugging agent is used, consisting of a tertiary amine surfactant and a temperature-responsive autogenic acid. It forms a worm-like micelle structure through hydrogen ions triggering a protonation reaction, achieving rapid glue formation and glue breaking. Water is used as a solvent, externally adjusting the pH value or high-temperature glue breaking without residue.

Benefits of technology

It realizes rapid sealing and rubber breaking in low-permeability tight reservoirs, reducing damage to the reservoir, is environmentally friendly, simple to construct, low cost, wide applicable temperature range, good sealing performance, no residue after rubber breaking, and quickly restores production capacity.

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Abstract

The invention discloses a dual stimulus-responsive supramolecular gel temporary plugging agent and a preparation method thereof, and relates to the technical field of oil-gas field development. The supramolecular gel temporary plugging agent comprises the following components in percentage by mass: 5wt%-10wt% of a tertiary amine surfactant; the temperature response authigenic acid accounts for 0.2 wt%-2wt%; and the balance of water. Wherein the tertiary amine surfactant is prepared by reacting fatty acid and N, N-dimethyl-1, 3-diaminopropane according to the molar ratio of 1: 1, and the temperature response authigenic acid is composed of methyl formate, ethyl formate, methyl acetate, ethyl acetate and the like; the dual-stimulus-responsive supramolecular gel temporary plugging agent disclosed by the invention has the plugging strength of 4.3 MPa, takes water as a solvent, and is simple in process, high in yield, strong in environmental protection property, stable in performance and low in cost.
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