Colloid acid system for acid fracturing of carbonate reservoir and preparation method thereof

A technology of carbonate rock storage and jelly acid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of fast reaction speed of acid rock, short retention time of high viscosity process, inability to effectively reduce formation condition filtration loss, etc. question
CN103374345AActive Publication Date: 2013-10-30PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2013-10-30

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Abstract

The invention relates to a colloid acid system for the acid fracturing of a carbonate reservoir and a preparation method thereof. The colloid acid system is characterized by being prepared by adding 0.8% of CYY-160, 1% of CYY-1 cross-linking agent and 1% of CYY-3 cross-linking retarder in HCl with the mass concentration of 20% in terms of the weight of HCl with the mass concentration of 20% as 100%, wherein the CYY-160 is a copolymer of 2-sulfoacrylamide-methylpropanesulfonic acid and N,N-dimethacrylamide; the CYY-1 is a compound of zirconium acetate, zirconium lactate and zirconium oxide; the CYY-3 is one of citric acid and lactic acid; and under a condition of 90 DEG C, the viscosity of a basic acid of the colloid acid system is more than 1000 mPa.s, the retardant rate is more than 85%, and the viscosity of gel breaking liquid is less than 15 mPa.s.
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Description

technical field

[0001] The invention relates to an acid liquid system applied to acid fracturing reformation of carbonatite reservoirs and its preparation. Background technique

[0002] The deep acid fracturing technologies used in deep acid fracturing of carbonate reservoirs can be summarized into the following technical series.

[0003] 1) Gelled acid (thickened acid) acid fracturing technology

[0004] The optimal viscosity of thickening acid in the ground is generally around 25mPa.S-30mPa.S, and the flowback viscosity of residual acid is generally between 5mPa.S-14mPa.S, which is easy to flow back and can carry the residual acid in formation fractures after reaction. solid particles.

[0005] 2) Slow acid process technology

[0006] Chemical retarded acid is a conventional acid added with surfactant. This system has a large fluid loss and is mainly suitable for medium and low temperature dolomite reservoirs. Due to the poor control of fluid loss, this technology is c...

Claims

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