Liquid wormhole acid system and preparation method thereof

An acid-acid and wormhole technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of fast reaction speed of acid rock, serious secondary precipitation, short effective distance of acid solution, etc., and achieve long-term effective Effective distance, high chelating ability and good retarding performance

Inactive Publication Date: 2017-07-14
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of fast reaction speed of acid rock, short effective action distance of acid liquid, serious secondary precipitation and other problems in conventional acidification transformation process of existing carbonate rock reservoirs

Method used

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  • Liquid wormhole acid system and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] This embodiment provides a kind of wormhole acid liquid system, which is composed of the following substances in mass percentage: organic acid 10%, clay stabilizer 3%, polyglucoheptonate 15%, surfactant 3%, water 69%.

[0020] making process:

[0021] Under the experimental conditions of 50~60°C in a water bath, add the formula amount of organic acid and water into the round bottom flask, then add the clay stabilizer and polyglucoheptonate in turn under the action of stirring, and finally add the surfactant and keep stirring. Stir until the solution is transparent, clear, and free from precipitation, stop stirring, and let it stand for 1 hour.

[0022] In this embodiment, the organic acid is formic acid; the clay stabilizer is type II polyaminomethacrylamide, the degree of polymerization is greater than 3000, and the manufacturer is Chengdu Anshide Petroleum Technology Development Co., Ltd.; polyglucoheptonate is Sodium polyglucoheptacarbonate, the relative molecular ...

Embodiment 2

[0024] This embodiment provides a wormhole acid liquid system, which is composed of the following substances in mass percentage: 20% organic acid, 3% clay stabilizer, 15% polyglucoheptonate, 3% surfactant, water 59%.

[0025] The preparation method is the same as in Example 1.

[0026] In this example, the organic acid is acetic acid; the clay stabilizer is type II polyaminomethacrylamide, the degree of polymerization is greater than 3000, and the manufacturer is Chengdu Anshide Petroleum Technology Development Co., Ltd.; polyglucoheptonate is Potassium polyglucoheptate carbonate, the relative molecular weight is greater than 100,000; the surfactant is a nonionic amphoteric surfactant, hydroxyl synthetic alcohol polyoxyethylene ether, and the degree of polymerization is greater than 3,000.

Embodiment 3

[0028] The present embodiment provides a wormhole acid liquid system, which is composed of the following substances in mass percentage: 25% organic acid, 3% clay stabilizer, 15% polyglucoheptonate, 3% surfactant, water 49%.

[0029] The preparation method is the same as in Example 1.

[0030] In this embodiment, the organic acid is ammonium triacetate, the clay stabilizer is type II polyaminomethacrylamide, the degree of polymerization is greater than 3000, and the manufacturer is Chengdu Anshide Petroleum Technology Development Co., Ltd.; polyglucoheptonic acid The salt is sodium polyglucoheptacarbonate, the relative molecular weight is greater than 100,000; the surfactant is anionic surfactant ammonium lauryl sulfate.

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Abstract

The invention provides a liquid wormhole acid system, which is composed of the following substances in percentage by weight: 10 to 25% of organic acid, 1 to 5% of clay stabilizing agent, 15 to 20% of polyglucoheptonate, 1 to 5% of surfactant, and the balance being water. The provided liquid wormhole acid system has a good retarding performance. The used organic acid is a polyatomic acid. The H<+> ionization speed is slow, thus the H<+> concentration is low, the acid-rock reaction speed is reduced from the source, the deep penetration of liquid acid is realized, a longer distance of useful effect is formed, and the flow conductivity is enhanced.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a wormhole acid liquid system and a preparation method thereof, which are used for inhibiting secondary and tertiary precipitation of scale during acidification of carbonate rock reservoirs. Background technique [0002] In view of the characteristics of low porosity, low permeability and strong heterogeneity of domestic carbonate gas reservoirs, acidizing technology can effectively develop this part of the reservoir. However, there are many significant problems in the reaction process between the conventional acid liquid system and the carbonate rock reservoir. For example, the conventional hydrochloric acid system has problems such as fast acid-rock reaction speed, short effective action time, excessive dissolution near the wellbore, and the precipitation generated during the acidizing process will cause serious secondary damage to the reservoir. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K2208/12
Inventor 池晓明张冕姬随波李年银胡光明陶长州高燕袁海平袁伟文李泽锋张楠林刘平礼罗志锋雷璠赵立强陈伟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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