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A hydraulic staggered depressurization and enhanced permeability drainage method for coal seam gas

A coal seam gas and hydraulic fracturing technology, which is applied in the direction of gas discharge, mining fluid, mining equipment, etc., to achieve the effects of preventing stress concentration effects, saving workload, and improving operating efficiency

Active Publication Date: 2018-06-29
河南能源集团研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of large-area pressure relief and permeability enhancement in low-permeability coal seams existing in existing projects, and to provide a hydraulic staggered pressure relief and permeability enhancement method for coal seam gas extraction

Method used

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  • A hydraulic staggered depressurization and enhanced permeability drainage method for coal seam gas
  • A hydraulic staggered depressurization and enhanced permeability drainage method for coal seam gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The hydraulic staggered pressure relief and anti-permeability drainage method for coal seam gas of the present invention, such as Figure 1-2 As shown, the specific steps are as follows:

[0027] (1) Use the integrated drilling and punching drill bit to drill from the floor drainage roadway 1 at the construction azimuth α=90° to the coal seam 9, discharge the powder under hydrostatic pressure, and drill through the coal seam 9 and enter the coal seam roof for 0.5m;

[0028] (2) Use high-pressure water as the medium and use hydraulic punching technology to punch the hole in step (1) from the bottom of the hole to the outside to form a hydraulic punching hole 2. The punching pressure is adjusted according to the coal seam firmness coefficient f It is 12f Mpa, and the amount of punched coal per meter of coal hole is not less than 1t, forming holes to relieve the pressure of the coal body;

[0029] Carry out sealing and continuous pumping to the hydraulic punching hole 2; ...

Embodiment 2

[0037] The hydraulic staggered pressure relief and anti-permeability drainage method for coal seam gas of the present invention, such as Figure 1-2 As shown, the specific steps are as follows:

[0038] (1) Use the integrated drilling and punching drill bit to drill from the floor drainage roadway 1 at the construction azimuth α=90° to the coal seam 9, discharge the powder under hydrostatic pressure, and drill through the coal seam 9 and enter the coal seam roof for 0.5m;

[0039] (2) Use high-pressure water as the medium and use hydraulic punching technology to punch the hole in step (1) from the bottom of the hole to the outside to form a hydraulic punching hole 2. The punching pressure is adjusted according to the coal seam firmness coefficient f It is 16f MPa, and the amount of punched coal per meter of coal hole is not less than 1t, forming holes to relieve the pressure of the coal body;

[0040] Carry out sealing and continuous pumping to the hydraulic punching hole 2; ...

Embodiment 3

[0048] The hydraulic staggered pressure relief and anti-permeability drainage method for coal seam gas of the present invention, such as Figure 1-2 As shown, the specific steps are as follows:

[0049] (1) Use the integrated drilling and punching drill bit to drill from the floor drainage roadway 1 at the construction azimuth α=90° to the coal seam 9, discharge the powder under hydrostatic pressure, and drill through the coal seam 9 and enter the coal seam roof for 0.5m;

[0050] (2) Use high-pressure water as the medium and use hydraulic punching technology to punch the hole in step (1) from the bottom of the hole to the outside to form a hydraulic punching hole 2. The punching pressure is adjusted according to the coal seam firmness coefficient f It is 20f MPa, and the amount of coal punched per meter of coal hole is not less than 1t, forming holes to relieve the pressure of the coal body;

[0051] Carry out sealing and continuous pumping to the hydraulic punching hole 2; ...

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Abstract

The invention provides a hydraulic diastrophism pressure relief and permeability increase coal seam gas extraction method suitable for efficient extraction of coal seam gas of low-permeability highly gassy mines. The method includes the steps that two rows of punched drill holes are constructed first through a punching drill, large-scale hydraulic punching is carried out, and two rows of pressure relief grooves formed by punched holes are formed in a coal seam; one or two fracturing drill holes are constructed between the two rows of punched drill holes, and steel pipes and cement are adopted for hole sealing; extraction pipes of the punched drill holes are disconnected, coal seam water injection is carried out on a coal body, the coal body is made to move towards the pressure relief grooves in the two sides, a large amount of coal powder and water are discharged, and hydraulic diastrophism pressure relief and permeability increase of the coal body are completed. By means of the method, the effect of permeability increase is achieved as a large number of fracture networks are generated when the coal body moves, the effect of coal body pressure relief is also achieved as a coal-water mixture is discharged, the stress concentration effect of the coal body is effectively prevented, coal seam gas desorption is promoted, the gas extraction effect is improved, and the method has high engineering practical value and good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas drainage, and in particular relates to a method for hydraulic staggered pressure relief and antireflection enhanced drainage of coal seam gas. Background technique [0002] Coal seam gas disaster is one of the five major disasters in mines, and it is an important factor restricting the efficient and safe production of coal mines. At the same time, gas is also a non-renewable clean energy. At present, mines mainly use construction drilling to extract coal seam gas to prevent and control gas disasters and improve resource utilization. For most single low-permeability outburst coal seams, low drainage efficiency, large drilling volume, and long drainage cycle become the technical bottlenecks faced by coal seam gas control, which seriously affects the normal succession plan of mines and restricts efficient production of mines. For this reason, coal practitioners at home and abroad have successi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/261E21F7/00
Inventor 陶云奇马耕刘东王洪盘孟杰杨程涛王峰李锋周正涛
Owner 河南能源集团研究总院有限公司
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