Acid liquid for acid fracturing and preparation method thereof

A technology of acid liquid and acid fracturing, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex process, high cost, high toxicity, etc., and achieve the effect of simple process, good elasticity, and low toxicity
CN102433111AActive Publication Date: 2012-05-02CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2012-05-02
Patent Text Reader

Abstract

The invention relates to acid liquid for acid fracturing and a preparation method thereof. The acid liquid for acid fracturing consists of the following substances: 5-40 weight percent of acid, 0.3-2.0 weight percent of polyacrylamide polymer, 0.03-1.5 weight percent of zirconium oxychloride, 0.03-1.5 weight percent of aldehyde cross-linking agent, 0.03-1.5 weight percent of phenol cross-linking agent and remaining weight percent of water, wherein the aldehyde cross-linking agent is at least one of aldehyde compounds and derivatives thereof, and the phenol cross-linking agent is at least one of phenol compounds and derivatives thereof. The acid liquid provided by the invention has the advantages of high viscosity, high adjustability, high elasticity and high temperature resistance after cross-linking, thereof the goals of acid liquid deep penetration and acid fracturing slot creation can be achieved, the cost is reduced, the harm to human bodies and the environmental pollution during construction are reduced and the acid fracturing reconstruction effect can be effectively improved.
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Description

technical field

[0001] The invention relates to an acid liquid in the technical field of oil field chemistry, in particular to an acid liquid used for acid fracturing stimulation measures for low-permeability reservoirs. Background technique

[0002] Acid fracturing is one of the important measures for improving production of low-permeability reservoirs. With the in-depth development of low-permeability reservoirs in my country, acid fracturing has been more and more widely used.

[0003] The performance of the acid fluid plays a key role in the effect of acid fracturing. In order to obtain a better acid fracturing effect, the acid fracturing fluid has the following requirements: increase the penetration of acid, delay the reaction speed of acid rock, and increase the action distance of acid fluid , to maximize acid-etched fractures to obtain high conductivity fractures close to hydraulic fracturing techniques.

[0004] The acid liquid commonly used in acid fracturing mainl...

Claims

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