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A low-friction emulsified acid solution for fracturing acidification and its application

A fracturing acidification, low friction technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limiting the popularization and application of emulsified acid, poor temperature resistance and shear resistance, and difficult liquid flowback, etc. Achieve the effects of excellent drainage performance, low construction friction and excellent retardation performance

Active Publication Date: 2016-03-09
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, and has special requirements for on-site construction equipment; conventional emulsified acid often uses diesel oil or crude oil as the external phase of emulsified acid, and the internal phase is generally It is hydrochloric acid or soil acid. Since the emulsified acid uses oil as the external phase, the acid liquid does not directly contact with the rock, so the acid liquid can enter the deep part of the reservoir and expand the treatment radius of the acid liquid to achieve the purpose of deep acidification of the formation. The disadvantage of high friction limits the popularization and application of emulsified acid

Method used

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  • A low-friction emulsified acid solution for fracturing acidification and its application
  • A low-friction emulsified acid solution for fracturing acidification and its application
  • A low-friction emulsified acid solution for fracturing acidification and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Slowly add 0.3 part of ODEA, 0.1 part of octadecyl primary amine, 0.2 part of n-octanoic acid, 1 part of drag reducer to diesel oil stirred at low speed, and stir thoroughly for 30 minutes to obtain an oil phase; add 1.5 parts of acid to 28% concentrated hydrochloric acid Liquid multi-effect additive, 1 part of drainage aid, fully stirred and circulated for 30 minutes to obtain the acid phase.

[0018] Emulsifying acid preparation: Slowly add 70 parts of acid phase liquid to 30 parts of oil phase in low-speed stirring circulation. After all the acid phase liquid is added, circulate at low speed for 30 minutes to fully emulsify.

[0019] The prepared emulsified acid solution is directly pumped into the fracturing manifold by a pump truck on site for acid fracturing construction.

[0020] Example 1 A low-friction emulsified acid system for fracturing and acidizing is suitable for acid fracturing of carbonate rock reservoirs at 60°C to 80°C.

Embodiment 2

[0022] Slowly add 0.4 parts of ODEA, 0.2 parts of octadecyl primary amine, 0.3 parts of n-octanoic acid, 2 parts of drag reducer to diesel oil stirred at low speed, and stir thoroughly for 30 minutes to obtain an oil phase; add 2 parts of acid to 28% concentrated hydrochloric acid Liquid multi-effect additives, 2 parts of drainage aids, fully stirred and circulated for 30 minutes to obtain the acid phase.

[0023] Emulsifying acid preparation: Slowly add 70 parts of acid phase liquid to 30 parts of oil phase in low-speed stirring circulation. After all the acid phase liquid is added, circulate at low speed for 30 minutes to fully emulsify.

[0024] The prepared emulsified acid solution is directly pumped into the fracturing manifold by a pump truck on site for acid fracturing construction.

[0025] Example 2 A low-friction emulsified acid system for fracturing and acidizing is suitable for acid fracturing of carbonate reservoirs at 80°C to 100°C.

[0026] The performance adva...

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Abstract

The present invention relates to a low friction emulsifying acid liquid for fracturing acidification. The low friction emulsifying acid liquid comprises an oil phase and an acid phase according to a volume ratio of 30:70, wherein the oil phase comprises, by volume, 0.25-0.5 part of ODEA, 0.1-0.3 part of C18-alkyl primary amine, 0.2-0.6 part of n-caprylic acid, 1-3 parts of a friction reduction agent, and the balance of diesel fuel, and the acid phase comprises, by volume, 1-3 parts of an acid liquid multiple effect additive, 1-2 parts of a cleanup additive, and the balance of 28% concentrated hydrochloric acid. The emulsifying acid is a stable acid-in-oil emulsion at a room temperature, has characteristics of high viscosity, low friction, high retardance capacity and good cleanup capability, and is provided for achieving expansion of the acid fracturing treatment radius and improvement of the acid-etched fracture conductivity.

Description

technical field [0001] The invention relates to a low-friction emulsified acid liquid for fracturing acidification. It is mainly used for deep acid fracturing of carbonate rocks. The acid solution system can reduce the reaction speed of acid rock, increase the effective distance of acid solution, and significantly improve the conductivity of acid-etched fractures. Background technique [0002] The acid fracturing of conventional carbonate rock reservoirs has problems such as too fast acid rock reaction speed, unable to form long acid-etched fractures, and unable 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 carbonate rocks, and proposed acid systems such as thickened acid (gelling acid), foam acid, and emulsified acid. 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 tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/602C09K8/604C09K8/725C09K8/74
Inventor 郝志伟王宇宾宋有胜徐鸿志汤发明王雪莹
Owner BC P INC CHINA NAT PETROLEUM CORP
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