Active water fracturing technology of coal-bed gas well

A coalbed methane well and water fracturing technology, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., can solve the problems of poor fracturing effect and inability to effectively increase coalbed methane production, and achieve improved flow conductivity, Improve fracturing effect and increase production effect

Active Publication Date: 2011-06-15
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an active water fracturing process for coalbed methane wells in order to solve the problems of poor fracturing effect of the existing hydraulic fracturing technology and the inability to effectively increase the output of coalbed methane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The active water fracturing process of coalbed methane wells is realized by the following steps: (1) Circulation: use the fracturing pump to drive the fracturing fluid from the tank truck to the tank truck and then return to the tank truck, so as to check the fracturing pump. Water conditions and pipeline connections; (2) Pressure test: close the main gate of the wellhead, hold the pressure on the ground high-pressure pipeline, wellhead, connecting thread, oil nonel, etc., and keep the pressure test qualified if it does not puncture or leak; (3) Squeeze test: After passing the pressure test, open the main gate of the wellhead, and use the fracturing pump to squeeze the fracturing fluid into the coal seam until the pressure is stable, so as to check whether the downhole pipe string and downhole tools are normal, and grasp the water absorption capacity of the coal seam; ( 4) Fracturing: After the test squeeze is completed, the fracturing pump is used to inject fracturing f...

Embodiment 2

[0010] The active water fracturing process of coalbed methane wells is realized by the following steps: (1) Circulation: use the fracturing pump to drive the fracturing fluid from the tank truck to the tank truck and then return to the tank truck, so as to check the fracturing pump. Water conditions and pipeline connections; (2) Pressure test: close the main gate of the wellhead, hold the pressure on the ground high-pressure pipeline, wellhead, connecting thread, oil nonel, etc., and keep the pressure test qualified if it does not puncture or leak; (3) Squeeze test: After passing the pressure test, open the main gate of the wellhead, and use the fracturing pump to squeeze the fracturing fluid into the coal seam until the pressure is stable, so as to check whether the downhole pipe string and downhole tools are normal, and grasp the water absorption capacity of the coal seam; ( 4) Fracturing: After the test squeeze is completed, the fracturing pump is used to inject fracturing f...

Embodiment 3

[0012] The active water fracturing process of coalbed methane wells is realized by the following steps: (1) Circulation: use the fracturing pump to drive the fracturing fluid from the tank truck to the tank truck and then return to the tank truck, so as to check the fracturing pump. Water conditions and pipeline connections; (2) Pressure test: close the main gate of the wellhead, hold the pressure on the ground high-pressure pipeline, wellhead, connecting thread, oil nonel, etc., and keep the pressure test qualified if it does not puncture or leak; (3) Squeeze test: After passing the pressure test, open the main gate of the wellhead, and use the fracturing pump to squeeze the fracturing fluid into the coal seam until the pressure is stable, so as to check whether the downhole pipe string and downhole tools are normal, and grasp the water absorption capacity of the coal seam; ( 4) Fracturing: After the test squeeze is completed, the fracturing pump is used to inject fracturing f...

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PUM

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Abstract

The invention relates to the coal-bed gas exploitation technology, and in particular relates to an active water fracturing technology of a coal-bed gas well, which is used for solving the problem that the yield of coal-bed gas can not be effectively improved by the existing hydraulic fracturing technology owing to a poor fracturing effect. The fracturing technology comprises the following steps: (1) circulation; (2) pressure test; (3) extrusion test; (4) fracturing; (5) support; and (6) pressure release, wherein, in steps (1), (3), (4) and (5), a fracturing fluid is prepared from clear water, a surfactant and a bactericide based on the volume ratio of 2000:1:1; in steps (4) and (5), the pumping delivery of a fracturing pump is 5-9m<3>/min; and the fracturing fluid is infused into the well via a sleeve by utilizing the fracturing pump. By utilizing the fracturing technology, the problem that the yield of coal-bed gas can not be effectively improved by the existing hydraulic fracturing technology owing to a poor fracturing effect is effectively solved, thus the technology is applicable to coal-bed gas exploitation.

Description

technical field [0001] The invention relates to coal bed gas mining technology, in particular to a coal bed gas well active water fracturing process. Background technique [0002] From the perspective of the development status of coalbed methane in my country, the main technical obstacle affecting the exploitation of coalbed methane in China is the low permeability of coal reservoirs; the permeability of coalbeds in most areas of my country is low, usually in the range of 0.1-0.001×10 μm , according to the standard of oil and gas reservoir permeability, the coal seam belongs to the ultra-low permeability reservoir, which makes it possible to extract the coalbed methane in the coal seam near the well when drilling and mining on the ground, resulting in that once the coal seam near the drilling hole After the gas is exhausted, the gas farther away cannot be replenished into the well in large quantities, resulting in gas supply failure, resulting in a sharp drop in productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
Inventor 王保玉田永东何辉王峰明刘刚白建平王宇红赵祉友赵小山焦海滨
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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