Carbonate rock acid fracturing coupling agent screening method for regulating and controlling acid rock reaction based on interface film formation

By using a multi-dimensional screening method, coupling agents suitable for deep high-temperature carbonate reservoirs were selected, solving the problem of rapid acid reaction and significantly improving the effect of deep stimulation.

CN122329949APending Publication Date: 2026-07-03CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202610437066.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-03
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In acid fracturing operations in deep high-temperature carbonate reservoirs, the rapid reaction between acid and rock leads to the rapid consumption of acid in the near-wellbore area, making it difficult to achieve effective deep stimulation. Existing rate control systems lack stability and adaptability, and there is a lack of systematic methods for screening and evaluating coupling agents.

Method used

A multi-dimensional, multi-scale method for screening and evaluating coupling agents is established. By testing the basic physical properties, interfacial film-forming ability, compatibility with fracturing fluid systems, and acid-rock reaction regulation effect of coupling agents, coupling agents suitable for specific reservoir conditions are screened out, application parameters are optimized, and their ability to delay acid-rock reaction rate and increase effective action distance is quantitatively evaluated.

Benefits of technology

The coupling agent significantly reduces the reaction rate of acid-rock reaction, expands the effective action distance of acid, and improves the effect of deep reservoir stimulation. The selected coupling agent reduces the reaction rate by more than 70% under high temperature conditions, and increases the effective action distance by more than 72% compared with conventional methods.

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Abstract

The invention relates to the technical field of oil and gas field yield increase and transformation, and discloses a carbonate rock acid fracturing coupling agent screening method for regulating and controlling acid rock reaction based on interface film formation. The method comprises the following steps: firstly, carrying out basic physical property testing on different types of coupling agents to evaluate the wettability and spreading ability of the coupling agents on the surface of the carbonate rock; then, the adsorption and film forming behaviors of the coupling agent on the rock surface are represented; carrying out compatibility evaluation on the coupling agent and different fracturing fluid systems; analyzing the influence of the coupling agent concentration and the stirring condition on the acid rock reaction rate through an acid rock reaction experiment, and establishing an acid rock reaction speed control evaluation index; finally, reservoir adaptability evaluation is carried out under different temperature, mineral composition and porosity conditions, and the target coupling agent suitable for carbonate rock acid fracturing construction is comprehensively screened out. A set of systematic coupling agent screening process is established, the acid rock reaction rate can be effectively reduced, the acid liquor acting distance is increased, and therefore the carbonate rock reservoir acid fracturing transformation effect is improved.
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