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Feeding method and device for hole protecting pipe for soft coal seam gas extraction hole

A technology for gas drainage and soft coal seam, applied in gas discharge, safety devices, mining equipment, etc., can solve the problems of residual coal chips in drilling, difficult to feed into local collapsed holes, etc., to achieve the effect of ensuring smooth passage

Active Publication Date: 2012-07-18
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for feeding the protection pipe of the gas drainage hole in the soft coal seam to solve the problem of feeding the protection pipe into the gas drainage hole of the soft coal seam. When drilling pipes, there are problems of drilling residual coal dust and partial hole collapse, which are difficult to feed.

Method used

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  • Feeding method and device for hole protecting pipe for soft coal seam gas extraction hole
  • Feeding method and device for hole protecting pipe for soft coal seam gas extraction hole

Examples

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Embodiment 1

[0026] Embodiment 1: When the borehole protection pipe is sent into the borehole, air with a certain pressure is pressed in to discharge the coal dust in front. The method scheme includes the following steps:

[0027] a. Use epoxy resin glue to fill the sieve holes of the perforated pipe, and install a vent on the top of the first section of the perforated pipe.

[0028] The hemispherical protective cover of the hole; a reducing joint is installed at the end of the last section of the hole protecting pipe, and the reducing joint is connected to the air intake pipe, and the air intake pipe is connected to the air compressor.

[0029] b. After the epoxy resin is solidified, make the air compressor work, and press air with a certain pressure into the hole protection pipe; send the first section of the hole protection pipe into the gas drainage borehole;

[0030] c. Turn off the air compressor, remove the variable diameter joint, connect the second protective tube to the first pro...

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Abstract

The invention relates to a feeding method for a hole protecting pipe for a soft coal seam gas extraction hole. The feeding method is characterized in that an epoxy resin adhesive is used for filling sieve pores of the hole protecting pipe before the hole protecting pipe is fed into a drill hole, air with a certain pressure is pressed into the hole protecting pipe in the process of feeding the hole protecting pipe into the drill hole, the air flows into the drill hole through a vent hole arranged at the top end of the hole protecting pipe, and high-speed air currents discharge coal dusts from an orifice along the hole protecting pipe and a gap of the wall of the drill hole. After the hole protecting pipe is fed into the bottom of the hole, an epoxy resin adhesive dissolving agent is injected into inner holes of the hole protecting pipe for dissolving the expoxy resin adhesive in the sieve pores so as to extract the gas. The feeding method is convenient in operation, can overcome the problem that the hole protecting pipe is difficult to feed into the drill hole due to the residual coal dusts in the gas extraction hole and local hole collapse, and has the advantages of long feeding distance of the hole protecting pipe, thereby ensuring the higher concentration and high flow of the soft coal seam gas extraction. The feeding method is particularly suitable for soft coals and very soft coal seams in which hole collapse easily occurs.

Description

technical field [0001] The invention relates to a method and a device for feeding a hole-protecting pipe into a gas extraction hole in a coal seam, in particular to a method and a device for feeding a hole-protecting pipe into a gas drainage hole in a soft coal seam. Background technique [0002] In my country, the proportion of soft coal seams is large and the gas content is generally high, and the collapse of soft coal seams is the main factor restricting gas extraction. At present, the measures to prevent hole collapse in soft coal seams are mainly to feed the hole protection pipe into the gas drainage hole (the hole protection pipe adopts screen pipe). However, due to factors such as soft and hard stratification of coal seams, deep high ground stress, and soft coal rheology, gas drainage drilling holes in soft coal seams will have different degrees of residual coal debris after the hole is formed, and it is easy to cause local coal dust in a short period of time. Deform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00
Inventor 周福宝高峰刘春王圣程刘应科肖翔
Owner CHINA UNIV OF MINING & TECH
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