Environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation

A technology of working fluid and coalbed methane, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of coal mine groundwater threat, well pipe corrosion, and adverse effects of coal mine groundwater quality, so as to enhance the dissolution ability and reduce corrosion , low corrosion effect

Active Publication Date: 2019-05-28
XIAN AODE PETROCHEM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of its existence is that a large amount of hydrazine hydrochloride and fluorine-containing compounds are added to its formula, which poses a potential threat to the underground water of coal mines
[0008] Hydrochloric acid, hydrofluoric acid or soil acid, etc. are directly used in low-permeability coalbed methane reservoir stimulation, which will cause serious well pipe corrosion problems, and will also have a certain degree of adverse effects on the quality of coal mine groundwater

Method used

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  • Environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation
  • Environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation
  • Environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the environmentally friendly acidification working fluid of Example 1 of the present invention is as follows:

[0025] Take appropriate amount of formic acid with a mass concentration of 88%, add water to make the volume to 100mL, dilute the formic acid concentration to 3%, then add 4g of citric acid, 4g of citric acid and formic acid to form an organic acid; then add 3g of potassium chloride and 1g of ammonium chloride , 3g potassium chloride and 1g ammonium chloride form an anti-swelling agent; then add 3g GLDA and 2g HEDTA, 3g GLDA and 2g HEDTA to form a chelating agent; finally add 0.5g of water-soluble imidazoline as a corrosion inhibitor to prepare an environmentally friendly acidification Working fluid.

[0026] In addition, only 2g of potassium chloride and 2g of ammonium chloride are added to 100mL of water to form a pre-fluid / post-fluid.

Embodiment 2

[0028] The preparation method of the environment-friendly acidification working fluid of Example 2 of the present invention is as follows:

[0029] Take appropriate amount of formic acid with a mass concentration of 88%, add water to make the volume to 100mL, dilute the formic acid concentration to 5%, then add 3g of citric acid, 3g of citric acid and formic acid to form an organic acid; then add 2g of potassium chloride and 2g of ammonium chloride , 2g potassium chloride and 2g ammonium chloride constitute an anti-swelling agent; then add 4g GLDA and 1g HEDTA, 4g GLDA and 1g HEDTA to constitute a chelating agent; finally add 0.8g water-soluble imidazoline as a corrosion inhibitor to prepare an environmentally friendly acidification Working fluid.

Embodiment 3

[0031] The preparation method of the environmentally friendly acidification working fluid of Example 3 of the present invention is as follows:

[0032] Take an appropriate amount of formic acid with a mass concentration of 88%, add water to make the volume to 100mL, dilute the formic acid concentration to 4%, then add 5g of citric acid, 5g of citric acid and formic acid to form an organic acid; then add 1g of potassium chloride and 3g of ammonium chloride , 1g potassium chloride and 3g ammonium chloride form an anti-swelling agent; then add 3g GLDA and 1g HEDTA, 3g GLDA and 1g HEDTA to form a chelating agent; finally add 1g water-soluble imidazoline as a corrosion inhibitor to prepare an environmentally friendly acidification work liquid.

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Abstract

The invention provides environment-friendly acidizing working fluid suitable for low-permeability coalbed methane reservoir stimulation, and belongs to the technical field of coalbed methane development. The environment-friendly acidizing working fluid is composed of organic acid, a chelating agent, an anti-swelling agent and a corrosion inhibitor, and every 100 parts of water includes the following components in parts by mass: 7-9 parts of organic acid, 4-5 parts of the chelating agent, 4 parts of the anti-swelling agent and 0.5-1 part of the corrosion inhibitor; and the organic acid is composed of formic acid and citric acid, the chelating agent is composed of glutamic acid N,N-oxalic acid (GLDA) and N-beta-hydroxy ethyl ethylenediamine triacetic acid (HEDTA), and the anti-swelling agentis composed of potassium chloride and ammonium chloride. The environment-friendly acidizing working fluid has the good corrosion effect on crystalline minerals in coal rock, can increase the crack width and porosity of the coal rock, and thus increase the gasometry permeability; and meanwhile, the corrosivity of the environment-friendly acidizing working fluid to pipes is low, pollution to coal mine groundwater cannot be caused, the quality of coal products produced in the later period cannot be affected, and the environment-friendly acidizing working fluid has good application prospects in low permeability coalbed methane reservoir stimulation.

Description

Technical field [0001] The invention relates to the technical field of coalbed methane development, in particular to an environmentally friendly acidizing working fluid suitable for increasing production of low-permeability coalbed methane reservoirs. Background technique [0002] CBM is a very important unconventional natural gas, which is adsorbed on the surface of coal matrix particles or exists in the pores and cracks of coal in a free state, and is an associated mineral resource of coal. Although my country has very rich CBM resources, its low permeability (generally 0.001-0.1mD) restricts the development and utilization of CBM. [0003] Although the hydraulic fracturing technology widely used in the stimulation of low-permeability coalbed methane can effectively communicate the cleats and structural fissures in the coal and rock, because coal and rock have strong stress sensitivity, the fissures will close under high pressure, which affects CBM desorption and the final gas p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 陈书雅伦玉鹏石彦平蔡记华
Owner XIAN AODE PETROCHEM ENG TECH CO LTD
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