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Gas extraction tube drilling feeding method

A gas extraction and gas drainage technology, which is applied in the field of gas extraction pipe drilling and transportation, can solve the problems of complicated and slow operation process, poor effect, affecting the mining speed, etc., and achieves high efficiency, simple operation and reduced mining cost. Effect

Inactive Publication Date: 2014-07-23
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is the operation process complex and slow, but the effect is not good, and it will also affect the overall mining speed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: A drilling method for gas drainage pipes, using PVC drill pipes and PVC drill bits instead of metal drill pipes and drill bits. The hollow PVC drill pipe carries the PVC drill bit to drill holes deep into the coal seam. When the drilled hole reaches the target position (for example, 60m), the PVC drill pipe is then sealed, and the hollow PVC drill pipe is used as a gas drainage pipe. Then the end of the PVC drill pipe is sealed and connected to the air extraction device for gas extraction. Wherein, the PVC drill pipe can be sealed and butted section by section, so that it can be continuously extended until it is drilled into a suitable position. In this embodiment, the hardness of the PVC drill bit is selected so that it reaches the optimum value with the hardness of the coal seam to be mined, so that the PVC drill pipe and drill bit of the disposable drilling tool are sufficient to withstand the working strength requirements of coal seam drilling.

[00...

Embodiment 2

[0012] Embodiment 2: On the basis of the method in Embodiment 1, the PVC drill is improved, that is, a metal blade is embedded in the drill edge to form a composite drill. For example, protruding ribs can be provided at the root of the metal blade, and matching grooves can be provided on the base of the drill bit, and the protruding ribs can be embedded in the grooves to form a composite body through a heat sealing process.

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PUM

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Abstract

The invention discloses a gas extraction tube drilling feeding method. A hollow PVC drill pipe carrying a PVC drill bit to drill to the deep position of a coal seam, then, hole sealing processing is carried out on the PVC drill pipe, and finally the tail end of the PVC drill pipe is connected to a gas extraction device in a sealed mode so that gas drainage operation can be carried out. According to the gas extraction tube drilling feeding method, the PVC drill pipe and the PVC drill bit serve as disposable drilling tools, and also have the gas drainage function, the gas drainage working procedure is simplified, and the hole collapse of drilled holes in the drill withdrawal process can be avoided; even though hole collapse occasionally happens due to the drilling process, the PVC drill pipe and the PVC drill bit cannot hinder extraction, and the extraction progress is not influenced; it is clear that the gas extraction tube drilling feeding method is easy and convenient to operate, high in efficiency and good in effect, the extraction cost can be reduced, the extraction progress is not influenced, and the gas extraction tube drilling feeding method is very beneficial for popularization and implementation.

Description

technical field [0001] The invention relates to a gas drainage technology in the field of coal mines, in particular to a gas drainage pipe drilling method. Background technique [0002] The coal seam has been buried deep underground for a long time, and its internal pressure is relatively high. The continuously produced coal bed gas (gas) is compressed in the coal seam and is in a stable state, but in the process of mining the coal seam, the balance of the coal seam is destroyed, and the high-pressure gas stored in the coal seam The gas can burst out suddenly causing a prominent accident. Gas outburst is a serious disaster in coal mines, which restricts the safe production of coal mines. On the other hand, because coalbed methane is partially sealed, it is not easy to be excluded under normal circumstances. According to the standard mining steps, it is necessary to drill holes in the coal seam and drain the gas before mining. For a long time, metal drilling tools have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B7/00E21B10/00E21B17/00
Inventor 李辉刘娟周霏李超岳志奇王新伟肖云涛
Owner HENAN POLYTECHNIC UNIV
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