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.

Active Publication Date: 2013-12-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are some acid liquid systems suitable for deep acid fracturing of carbonate rocks, such as gelling acid, emulsifying acid, viscous acid, surface active acid, etc., which increase the viscosity of acid liquid and reduce the contact area between acid and rock. It slows down the reaction rate of acid rock, but due to its various shortcomings, its scope of application is greatly limited
For example, gelled acid and viscous acid still have a fast reaction speed with rock at high temperature, and the penetration distance is limited; emulsified acid is not easy to prepare, and its friction is high, so it is difficult to use in deep wells and high-pressure reservoirs; surface active acid High cost, difficult to prepare, not suitable for promotion and use
Autogenic acid is an ideal deep-penetrating acid, but the current conventional autogenous acid system is mainly used for acidizing sandstone reservoirs; at present, there is no mature autogenous acid system for carbonate reservoirs at home and abroad

Method used

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  • Authigenic acid system and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Add 500ml of 18% hydrochloric acid into a clean 2000ml beaker, and the water quality requirement for acid preparation should be industrial clear water;

[0045](2) Add 2% EDTA tetrasodium salt (ZX-09) and 1% corrosion inhibitor cetyl mercaptan (ZX-10) according to the internal addition method, and stir evenly;

[0046] (3) Add 20 grams of benzenesulfonate (ZX-19) surfactant dry powder, and stir evenly;

[0047] (4) Add 340 grams of organic ammonium chloride salt (ZX-339) dry powder and stir well;

[0048] (5) Add 325 grams of polydimethylaminobenzaldehyde (ZX-368) dry powder and stir well.

Embodiment 2

[0050] (1) Add 500 ml of 15% hydrochloric acid into a clean 2000 ml beaker, and the water quality requirement for acid preparation is industrial clear water;

[0051] (2) Add 2% EDTA tetrasodium salt (ZX-09) and 1% corrosion inhibitor cetyl mercaptan (ZX-10) according to the internal addition method, and stir evenly;

[0052] (3) Add 20 grams of hydroxyethyl polyalkylamine (ZX-19) surfactant dry powder, and stir well;

[0053] (4) Add 350 grams of benzoyl chloride (ZX-339) dry powder and stir well;

[0054] (5) Add 325 grams of polyhexaldehyde (ZX-368) dry powder and stir well.

Embodiment 3

[0056] (1) Add 500ml of 16% hydrochloric acid into a clean 2000ml beaker, and the water quality requirement for acid preparation should be industrial clear water;

[0057] (2) Add 2% EDTA tetrasodium salt (ZX-09) and 1% corrosion inhibitor cetyl mercaptan (ZX-10) according to the internal addition method, and stir evenly;

[0058] (3) Add 20 grams of methane halide amine (ZX-19) surfactant dry powder, and stir well;

[0059] (4) Add 350 grams of allyl chloride (ZX-339) dry powder and stir well;

[0060] (5) Add 320 grams of polydimethylaminobenzaldehyde (ZX-368) dry powder and stir well.

[0061] Dosing Method 2: Concentrate Dosing

[0062] Dosing of concentrated liquid: first make ZX-339 into concentrated liquid, make ZX-368 into suspension with ZX-19, and then make liquid.

[0063] 1. The preparation method of ZX-339 concentrate, taking the preparation of 200ml as an example:

[0064] (1) Add 100ml of industrial water to a 300ml beaker;

[0065] (2) Add 160 grams of ZX-...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72
Inventor 张福祥周理志袁学芳杨向同刘举刘洪涛冯觉勇刘会锋
Owner PETROCHINA CO LTD
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