Protected seam bottom plate upward comb-shaped drilled hole gas extraction method

A protected layer and gas drainage technology, applied in the direction of gas discharge, earth drilling, mining equipment, etc., can solve the problems of increasing the cost of extraction, affecting the mining efficiency and cycle, and the large amount of drilling engineering, so as to improve the gas consumption. Drainage efficiency, shorten the mining cycle, reduce the effect of construction costs

Active Publication Date: 2012-09-12
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, this method needs to arrange one or more rock roadways in the coal seam floor strata, construct a drilling field at intervals in the rock roadway, and construct a large number of upward cross-layer drainage drilling h

Method used

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  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method
  • Protected seam bottom plate upward comb-shaped drilled hole gas extraction method

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[0017] Such as figure 1 As shown, the comb-shaped borehole gas drainage method of the bottom plate of the protected layer of the present invention firstly arranges the drill site A in the bottom plate III of the protected layer, and first drills a main hole 1 in the drill site A along the direction of the working face. 1 The vertical distance between the horizontal position and the protected layer Ⅱ is 15-25m; after the main hole 1 is drilled 15m, stop drilling, ream the main hole 1, install the sealing pipe in the reaming hole, and install the sealing pipe The length of the hole is 8~15m; install the blowout preventer and the gas-water separator at the orifice; continue to drill the main hole 1 along the direction of the working face with near-horizontal directional drilling until the main hole 1 reaches the set depth; built into the main hole 1 Enter the packer whipstock 3 to the innermost end, and then set the position of the first strong manufacturing bevel point from the in...

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Abstract

The invention discloses a protected seam bottom plate upward comb-shaped drilled hole gas extraction method. The method comprises the following steps of: performing directional drilling on a protected seam bottom plate; after a drill is lifted, inserting a special packing deflecting device from a hole, and performing upward branch drilling by using a small-diameter large-bent angle hole bottom motor from inside to outside to form multiple groups of protected seam bottom plate upward comb-shaped drilled holes; and after all drilling construction is finished, sealing the holes, connecting a gas extraction pipeline and extracting gas. The method is used for extracting gas in a protective seam mining technology, and has the characteristic of one hole and multiple purposes; the gas of a protected seam can be pre-extracted before the protective seam is mined; after the protective seam is mined, the extraction of pressure-relief gas of the protected seam can be realized; and the construction cost is low, and a period is short.

Description

technical field [0001] The invention relates to gas extraction technology, in particular to a method for gas extraction with comb-shaped holes on the bottom of a protected layer. Background technique [0002] The "Regulations on the Prevention and Control of Coal and Gas Outburst" requires that regional outburst prevention measures must be taken before mining outburst coal seams. Protective layer mining technology is a major regional outburst prevention measure, which involves two coal seams, the protective layer and the protected layer. The coal seam that is first mined to eliminate the outburst danger of the adjacent coal seam (protected seam) is called the protective seam; due to the mining function of the protective seam and the simultaneous extraction of pressure relief gas, the adjacent outburst dangerous coal seam can be transformed into no outburst danger The coal seam, the adjacent protruding dangerous coal seam is called the protected seam. After the protective la...

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Application Information

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IPC IPC(8): E21F7/00
Inventor 王亮程远平金侃卢守青张晓磊安丰华
Owner CHINA UNIV OF MINING & TECH
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