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Slow-speed low-friction acid solution system for acid fracturing

A low-friction, acidic liquid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of liquid not easy to flow back, high friction, filtration loss and low friction, etc., to avoid construction friction High performance and excellent retarding performance

Inactive Publication Date: 2015-05-20
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary thickened acid (gelled acid) reduces the reaction rate of acid rock by adjusting the viscosity of the acid liquid, but this type of system has poor temperature resistance and shear resistance, and the liquid is not easy to flow back after the gel is broken; foam acid has low filtration loss, It has the advantages of small frictional resistance and small amount of acid liquid, but it is only suitable for acid fracturing construction in well depths of 1500-2500m, not suitable for high-temperature deep well acid fracturing, and has special requirements for on-site construction equipment; emulsified acid often uses diesel oil or crude oil as emulsification The external phase of the acid, the internal phase is generally hydrochloric acid or earth acid, which has the disadvantage of high friction (20% higher than that of ordinary thickened acid), and the use of diesel oil causes safety hazards in on-site construction, and also limits the use of emulsified acid. Promote application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 6 parts of diesel oil, 0.08 parts of emulsifier, 0.7 parts of acid solution multi-effect additive, 13.22 parts of 31% hydrochloric acid are made into emulsified acid, 0.2 parts of thickener, 0.6 parts of drainage aid, 2.4 parts of high temperature corrosion inhibitor, 0.6 part of Iron ion stabilizer, 76.2 parts of 31% hydrochloric acid is made into thickening acid. At the same time, a pump truck is used to pump the emulsified acid and thickened acid into the high-pressure manifold at a volume ratio of 20:80 for acid pressure construction.

[0018] Example 1 A high-retardation and low-friction acid fluid system for acid fracturing is suitable for acid fracturing of carbonate rock reservoirs with a depth of 100°C and a well depth of more than 2500 meters.

Embodiment 2

[0020] 6 parts of diesel oil, 0.12 parts of emulsifier, 1.5 parts of acid solution multi-effect additive, 12.38 parts of 31% hydrochloric acid are made into emulsified acid, 0.4 parts of thickener, 0.7 parts of drainage aid, 3.0 parts of high temperature corrosion inhibitor, 0.7 parts of Iron ion stabilizer, 75.2 parts of 31% hydrochloric acid is made into thickening acid. At the same time, a pump truck is used to pump the emulsified acid and thickened acid into the high-pressure manifold at a volume ratio of 20:80 for acid pressure construction.

[0021] Example 2 A high-retardation and low-friction acid fluid system for acid fracturing is suitable for acid fracturing of carbonate rock reservoirs with a depth of 120°C and a well depth of more than 3000 meters.

Embodiment 3

[0023] 6 parts of diesel oil, 0.15 parts of emulsifier, 2.1 parts of acid solution multi-effect additive, 13.22 parts of 31% hydrochloric acid are made into emulsified acid, 0.6 parts of thickener, 0.8 parts of drainage aid, 3.6 parts of high temperature corrosion inhibitor, 0.8 parts of Iron ion stabilizer, 74.2 parts of 31% hydrochloric acid is made into thickening acid. At the same time, a pump truck is used to pump the emulsified acid and thickened acid into the high-pressure manifold at a volume ratio of 20:80 for acid pressure construction.

[0024] Example 3 A high-retardation and low-friction acid fluid system for acid fracturing is suitable for acid fracturing of carbonate rock reservoirs with a depth of 140°C and a well depth of more than 3500 meters.

[0025] In the above embodiment, emulsifier was purchased from Binzhou Guangyou Chemical Co., Ltd.; acid solution multi-effect additive was purchased from Beijing Shida Aode Technology Co., Ltd.; thickener was purchase...

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Abstract

Disclosed is a retardant low-friction acid liquid system for acid fracturing. The retardant low-friction acid liquid system for acid fracturing consists of 20-40 parts of emulsified acid and 60-80 parts of thickened acid, the total volume of emulsified acid and thickened acid being 100 parts. The retardant low-friction acid liquid system for acid fracturing has high viscosity, low leak-off, good retardancy, low friction and good discharge capacity under conditions of normal temperature and strong acid, facilitating fracture initiation, and can be used to enlarge the acid fracturing treatment radius and improve acid etched fracturing conductivity.

Description

technical field [0001] The invention relates to a slow-speed and low-friction acid liquid system for acid pressing. Background technique [0002] The acid fracturing of high-temperature carbonate reservoirs has problems such as too fast reaction rate of acid rock, inability to form long acid corrosion fractures, and inability to achieve deep acid fracturing. Experts and scholars at home and abroad have done a lot of research work to solve the deep acid fracturing of high-temperature deep wells in carbonate rocks, and proposed acid systems such as thickening acid (gelling acid), foaming acid, and emulsified acid. Ordinary thickening acid (gelling acid) reduces the reaction rate of acid rock by adjusting the viscosity of acid solution, but this type of system has poor temperature resistance and shear resistance, and the liquid is not easy to flow back after gel breaking; foam acid has low filtration loss, It has the advantages of low friction resistance and small amount of ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72
CPCC09K8/74C09K8/76C09K2208/32
Inventor 郝志伟宋有胜王宇宾徐鸿志赵文娜刘婧丹王雪莹叶松滨
Owner BC P INC CHINA NAT PETROLEUM CORP
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