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Sandstone reservoir retarded acid, application and sandstone reservoir yield increase transformation method

A technology of retarded acid and reservoir, which is applied in the production stimulation and transformation of sandstone reservoirs, and in the field of sandstone reservoir retarded acid, which can solve the problems of fast reaction rate and difficulty in realizing deep acidification of sandstone reservoirs, and achieve small corrosion and damage, The effect of reducing acidity and avoiding cumbersome processes

Inactive Publication Date: 2021-10-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a sandstone reservoir retarding acid, its application and a method for increasing production of sandstone reservoirs, so as to at least solve the problem in the prior art that the reaction rate is too fast and it is difficult to realize sandstone reservoirs during production stimulation and transformation of sandstone reservoirs. The problem of deep acidification

Method used

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  • Sandstone reservoir retarded acid, application and sandstone reservoir yield increase transformation method
  • Sandstone reservoir retarded acid, application and sandstone reservoir yield increase transformation method
  • Sandstone reservoir retarded acid, application and sandstone reservoir yield increase transformation method

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Embodiment 1

[0038] Present embodiment provides a kind of sandstone reservoir retarded acid, and this sandstone reservoir retarded acid is made up of the formic acid of 15g, the hydroxyethylidene diphosphonic acid of 5g, the hydrofluoric acid of 0.5g, the corrosion inhibitor of 2g and 77.5g Among them, the corrosion inhibitor is composed of Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propynyl alcohol, Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propyne The mass ratio of alcohol is 30:35:15:20, and the quinoline type quaternary ammonium salt is 1,2-dibromoquinoline ethane.

Embodiment 2

[0040]Present embodiment provides a kind of sandstone reservoir retarded acid, and this sandstone reservoir retarded acid is made up of the formic acid of 15g, the hydroxyethylidene diphosphonic acid of 5g, the hydrofluoric acid of 3g, the corrosion inhibitor of 2g and the water of 75g Composition; Wherein, corrosion inhibitor is made up of Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propynyl alcohol, the composition of Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propynyl alcohol The mass ratio is 50:25:5:20, and the quinoline-type quaternary ammonium salt is 1,3-dichloroquinoline-2-hydroxypropane.

Embodiment 3

[0042] Present embodiment provides a kind of sandstone reservoir retarded acid, and this sandstone reservoir retarded acid is made up of the formic acid of 15g, the hydroxyethylidene diphosphonic acid of 5g, the hydrofluoric acid of 5g, the corrosion inhibitor of 2g and the water of 78g Composition; Wherein, corrosion inhibitor is made up of Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propynyl alcohol, the composition of Mannich base, quinoline type quaternary ammonium salt, chromium chloride and propynyl alcohol The mass ratio is 40:30:15:15, and the quinoline-type quaternary ammonium salt is benzyl quinoline chloride.

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Abstract

The invention provides a sandstone reservoir retarded acid, an application and a sandstone reservoir yield increase transformation method. According to the retarded acid for the sandstone reservoir, appropriate raw materials such as the organic weak acid, the chelating agent, the hydrofluoric acid, the corrosion inhibitor and the water are selected and matched with the appropriate proportion of the raw materials, the retarded acid for the sandstone reservoir is prepared, when the retarded acid is used for increasing the yield of the sandstone reservoir, the reaction rate can be effectively reduced, and the effect of deeply acidizing the sandstone reservoir is achieved. The yield increase transformation method comprises the step of injecting retarded acid of the sandstone reservoir into the sandstone reservoir to achieve the purpose of yield-increasing transformation.

Description

technical field [0001] The invention belongs to the technical field of oil field stimulation and transformation, and in particular relates to a slow acid for sandstone reservoirs, its application and a method for production stimulation and transformation of sandstone reservoirs. Background technique [0002] The goal of sandstone reservoir stimulation is to reduce the damage caused by drilling, production and completion in the production area of ​​the oil well. Acidizing is an important method of oil field stimulation and transformation. The use of acid liquid to dissolve rocks can expand the seepage channels of oil layer rocks, dissolve blockages in seepage channels or break rocks to form new artificial fractures, thereby improving oil and gas permeability. , the channel is unblocked. [0003] As we all know, sandstone reservoirs generally contain four types of minerals: quartz, feldspar, clay and carbonate. In order to stimulate production of sandstone reservoirs, hydroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74C09K8/76C09K8/54
CPCC09K8/74C09K8/76C09K8/54C09K2208/32
Inventor 刘洪涛周福建彭建新彭芬姚二冬李伟刘豇瑜赵容怀陈飞张伟军朱饶云邹国庆任慧宁谭艳新
Owner PETROCHINA CO LTD
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