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Gas extraction equipment and method for low coal penetration layer

A coal seam gas and drainage technology, which is applied in the field of low-permeability coal seam gas drainage equipment, can solve the problems of small borehole spacing, poor gas permeability of coal reservoirs, and poor pre-extraction effect of gas, so as to increase and reduce the distance between gas drainage The amount of drilling work and the effect of improving the effect

Inactive Publication Date: 2011-05-25
HENAN POLYTECHNIC UNIV
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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 problems of poor air permeability of the coal reservoir, small borehole spacing, and poor pre-extraction effect during the gas pre-pumping process. Through the joint action of vibration and hydraulic jet, the stress of the coal reservoir can be effectively released and the coal reservoir can be improved. Low-permeability coal seam gas drainage equipment and method for reservoir conductivity, reducing drilling engineering, increasing coal mining speed, and reducing costs

Method used

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  • Gas extraction equipment and method for low coal penetration layer
  • Gas extraction equipment and method for low coal penetration layer
  • Gas extraction equipment and method for low coal penetration layer

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Embodiment 1

[0023] Depend on Figure 1-Figure 3 The shown low-permeability coal seam gas drainage equipment includes a hollow drill pipe 6, the end of the drill pipe 23 is connected to a high-pressure water pump 12 through a pipeline, and the high-pressure water pump 12 is connected to a water tank 15. The pipeline includes a high-pressure hose 2, and the high-pressure water pump 12 to the high-pressure hose 2 at the end of the drill rod 23, a control valve 4 and a flow meter 1 are arranged in sequence. Nozzles 7 are arranged at intervals on the drill pipe 6, and a vibrator is arranged in the drill pipe 6. The vibrator includes an eccentric block 9 driven by a motor 13 through a rotating shaft. The motor 13 is located outside the drill pipe 6. The axial section of the eccentric block 9 is Trapezoidal and the small end is towards the front end 24 of the drill pipe 6, the cross-section of the eccentric block 9 is in the shape of a 45° fan, and the radial section of the drill pipe part of th...

Embodiment 2

[0025]The low-permeability coal seam gas drainage method is realized on the basis of the low-permeability coal seam gas drainage equipment described in Embodiment 1. First set up the low-permeability coal seam gas drainage equipment as described in Example 1, send the drill pipe 6 into the borehole, inject water into the water tank 15, and choose whether to open the vibrator according to the coal structure. If it is a soft coal seam, it can be opened first. The vibrator vibrates the coal seam, and then sends high-pressure water to the drill pipe 6 through the high-pressure water pump 12 and sprays the coal seam through the nozzle 7; The nozzle 7 acts on the coal seam, or can carry out water jet and open the vibrator to vibrate the coal seam at the same time. When the vibrator is turned on, a steel bar 14 extending radially and obliquely is arranged around the hole wedge 10, and the steel bar 14 is inserted into the coal body. At this time, by rotating the drill pipe 6, while t...

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Abstract

The invention discloses gas extraction equipment and a gas extraction method for a low coal penetration layer. The gas extraction equipment for the low coal penetration layer comprises a hollow drill rod, wherein the tail end of the drill rod is connected with a high-pressure water pump through a pipeline; the high-pressure pump is communicated with a water tank; nozzles are arranged at intervalson the rod body of the drill rod; and a vibrator is arranged in the drill rod. The gas extraction method for the low coal penetration layer comprises the following steps of: arranging the gas extraction equipment for the low coal penetration layer, inserting the drill rod into a drill hole, determining whether to start the vibrator or not according to the structure of a coal body, starting the vibrator for vibrating a coal layer if the coal body is a soft coal layer, feeding high-pressure water to the drill rod by using the high-pressure water pump and spraying the high-pressure water to the coal layer through the nozzles; and if the coal body is a hard coal layer, starting the high-pressure water pump for feeding water into the drill rod and spraying the water onto the coal layer throughthe nozzles of the drill rod or vibrating during water jetting. Specific to the problems of poor air permeability and the like of a coal reservoir in a gas pre-extraction process, in the gas extraction equipment and the gas extraction method for the low coal penetration layer, the stress of the coal reservoir is released effectively.

Description

technical field [0001] The invention relates to low-permeability coal seam gas drainage equipment and a method. Background technique [0002] Coal and gas outburst is one of the important disasters that occur underground in coal mines. Gas pressure is one of the important conditions for coal and gas outburst, and the gas content directly affects the size of the gas pressure. In order to solve the many hazards caused by coal mine gas, after years of theoretical and practical exploration, gas control workers at home and abroad have mainly adopted mining protection layers, intensive drilling, high negative pressure drainage, coal seam water injection, advanced water injection, loose blasting, Hydraulic punching, hydraulic scouring, metal skeleton, hydraulic extrusion, hydraulic fracturing and other methods have carried out gas drainage, and at the same time assisted the gas ventilation system to greatly reduce coal and gas outburst accidents. However, most of my country's coal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00
Inventor 倪小明苏现波贾炳李金海吕闰生
Owner HENAN POLYTECHNIC UNIV
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