Method for improving crossing-hole gas extraction concentration

A technology of drilling through layers and gas drainage, which is applied in the field of increasing gas drainage concentration, can solve the problems of gas drainage concentration decrease, shorten the effective drainage life of drainage drilling, reduce the utilization rate of drilling and other problems, and achieve reduction Emissions, promotion of coal mine safety production, significant effect

Active Publication Date: 2011-01-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0003] The drainage cycle of the pre-extraction of coal seam gas by drilling through the bed is generally more than one year. During this period, the drilling through the bed is inevitably affected by the ground stress, so that the cracks around the drilling through the bed begin to develop, expand and communicate. Finally, the outside air easily enters the drainage boreholes from these cracks under the nega

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  • Method for improving crossing-hole gas extraction concentration
  • Method for improving crossing-hole gas extraction concentration
  • Method for improving crossing-hole gas extraction concentration

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Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] figure 1 As shown, firstly, the position of layer-penetrating drill holes 1 is arranged in the rock roadway 9 near the coal seam 8 area where gas drainage is required, and the number of layer drill holes 1 is determined according to the actual situation on site. figure 2 The layout of the holes shown in the layout is taken as an example. Two rows and two columns of four bed-through drill holes 1 are arranged at intervals, and each bed-through drill hole 1 with a diameter of Φ75 mm to Φ95 mm is constructed one by one in the direction of the coal seam 8. Stop drilling when the layer-penetrating drilling 1 penetrates the coal seam 8, pull out the drill pipe, install the extraction pipe and seal the hole, the sealing depth is 6-10m; connect each extraction pipe to the extraction system for extraction.

[0021] When the concentration of gas drainage in ...

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Abstract

The invention discloses a method for improving crossing-hole gas extraction concentration, which is particularly applied to crossing-hole later-stage pre-extraction coal bed gas in a hole cluster mode. When the gas extraction concentration is lower than 30 percent, a plurality of small peripheral holes are formed around the crossing-hole cluster, and at least one inner small hole is formed insidethe hole cluster; powder conveying pipes are arranged inside the small peripheral holes and the inner small hole and hole openings are sealed by a polyurethane sealant; and fine powder is respectively blown into the small peripheral holes and the inner small hole through the powder conveying pipes due to an underground air pressure system, and the fine powder enters fracture air leakage channels around crossing holes and blocks channels through which airflows enters the crossing holes in a tunnel under the coaction of positive pressure of the underground air pressure system and negative pressure of extracting the gas. The method for improving the crossing-hole gas extraction concentration has the advantages of capacity of greatly improving the crossing-hole gas extraction concentration, prolonging the drilling hole effective extraction period, along with simple, convenient and rapid operation.

Description

technical field [0001] The invention relates to a method for increasing the concentration of gas extraction, in particular to a method for increasing the concentration of gas extraction after long-term pre-extraction of coal seam gas through bed-through drilling arranged in the form of hole groups. Background technique [0002] The pre-extraction of coal seam gas by drilling through the bed is one of the main measures taken to prevent and control coal and gas outburst. However, due to the long period of gas extraction, the succession of mine excavation is tense. In order to improve the effect of pre-extraction of coal seam gas, most of the outburst mines in my country adopt high negative pressure and large flow drainage system, which will inevitably increase the amount of gas leakage and reduce the concentration of gas extraction. The tight problem of excavation replacement makes the concentration of the gas drainage pumping station lower than 30%, so that the gas utilization...

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Application Information

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IPC IPC(8): E21B43/267E21F7/00
Inventor 周福宝胡胜勇胡东亮刘应科夏同强王圣程宋小林刘春
Owner CHINA UNIV OF MINING & TECH
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