Authigenic acid system and its application

An autogenous acid and system technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult use, difficult preparation, limited penetration distance, etc., and achieve the effect of convenient liquid preparation and simple composition.
CN103450872AActive Publication Date: 2013-12-18PETROCHINA 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
2013-12-18

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Abstract

The invention relates to an authigenic acid system and its application. The authigenic acid contains ZX-339 and ZX-368 components, the mole ratio of n(ZX-339) to n(ZX-368) is 5:8. Under a reaction temperature of 70DEG C-100DEG C, 19%-21% hydrochloric acid can be produced. The ZX-339 is any one of allyl chloride, benzoyl chloride, and a chlorinated organic ammonium salt. The ZX-368 is any one of polydimethylaminobenzaldehyde and polyhexa aldehyde. A clean acid fracturing fluid system is employed to carry the authigenic acid system to deep stratum. During application, the authigenic acid is compounded from, by weight: 2% of ZX-19, 15-20% of hydrochloric acid, 2% of ZX-09, 1% of ZX-10, (12-18)% of ZX-339, (10-16)% of ZX-368, and the balance water. The corrosion ability of the authigenic acid is equivalent to 70%-74% of that of isoconcentration hydrochloric acid.
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Description

technical field

[0001] The invention relates to an autogenous acid system and its application. Specifically, it is an acid liquid system suitable for deep acid fracturing of high-temperature carbonate rock reservoirs and its application. Background technique

[0002] In recent years, the development of carbonate reservoirs has attracted more and more attention. Carbonate reservoirs generally have the characteristics of low permeability and strong heterogeneity, and often need to be stimulated to improve their productivity. Acid fracturing is one of the commonly used stimulation measures for carbonate rock reservoirs. Its mechanism is: use acid liquid to etch the walls of artificial fractures non-uniformly, so that the walls of the fractures cannot be completely closed after the construction pressure is removed, thus forming a certain fracture wall. Flow channel with diversion capacity. The effect of acid fracturing mainly depends on the conductivity of acid-etched fractur...

Claims

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