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An internally supported hole-protecting pipe for gas pumping in soft coal seams and its preparation method

A soft coal seam and supporting technology, which is applied in the field of soft coal seam gas pumping and the preparation of internally supported borehole protection pipes, can solve the problems of low hole collapse resistance of the borehole protection pipes, and facilitate the transportation of pipes and the operation of hole protection processes , tube body weight control, cost-saving effects

Active Publication Date: 2016-04-13
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 an internally supported borehole pipe for gas drainage in soft coal seams and its preparation method to solve the problem of low hole collapse resistance of the borehole pipe for underground gas drainage in coal mines

Method used

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  • An internally supported hole-protecting pipe for gas pumping in soft coal seams and its preparation method
  • An internally supported hole-protecting pipe for gas pumping in soft coal seams and its preparation method
  • An internally supported hole-protecting pipe for gas pumping in soft coal seams and its preparation method

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Embodiment 1

[0029] Embodiment 1: The pipe is made of antistatic and flame-retardant materials, and the internal structure of the pipe is arranged in a circular manner according to the inner support section and the hollow section; The inner support section is a herringbone inner support structure 1 or a cross-shaped inner support structure 8; the hollow section is a hollow structure 2, and there are screen holes 3 on the pipe body of the hollow structure 2.

[0030] The construction drilling diameter is 89mm and the hole depth is 100m. The pipe is a thin-walled hollow hard PE plastic pipe with a length of 4m and a wall thickness of 8mm. The internal structure of the tube is arranged circularly according to the herringbone inner support structure 1 and the hollow structure 2 (see attached figure 1 ), the length of the herringbone inner support structure 1 of the hole protection pipe is 20cm, the length of the hollow structure 2 is 100cm, and there are sieve holes 3 on the pipe body of the ...

Embodiment 2

[0038] Embodiment 2: The diameter of the construction drilling hole is 94mm, and the hole depth is 120m. The pipe is a thin-walled hollow PVC plastic pipe with a length of 4m and a wall thickness of 8mm. The internal structure of the tube is arranged circularly according to the cross-shaped inner support structure 8 and the hollow structure 2 (see attached Figure 5 ), the length of the cross-shaped inner support structure 8 of the hole guard pipe is 25cm, and the length of the hollow structure 2 is 120cm.

[0039] as attached Figure 6 As shown, the cross-shaped inner support structure 8 is composed of four support bodies distributed at an angle of 90°, the four support bodies are connected to the center of the pipe, and the ends are respectively connected to the pipe wall. The support body is in the shape of a cuboid with a thickness of 4-6 mm and a width equal to the inner diameter of the tube.

[0040] The processing technology of the inner support type protective hole ...

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Abstract

The invention discloses an inner support hole protection pipe for pumping gas from a soft coal seam and a manufacturing method, belonging to a pipe for pumping gas from a drill hole in a coal seam and preventing hole collapse. The pipe is made of an anti-static flame-retardant master batch, and inner support segments and hollow segments are arranged circularly in sequence inside the pipe. The processing process of the inner support hole protection pipe comprises the following steps: extruding the master batch into a neck mold by using a plastic extruder; arranging blocking covers which can be controlled to be opened and closed at the joint of the pipe body space of the neck mold and an inner support structural space as well as between the inner support structural space and the outlet of the extruder respectively; controlling a processing model of the hole protection pipe by adjusting the opening and closing of the blocking covers. Molded hole protection pipe support structures and unsupported structures are arranged alternatively to construct a beam structure, and the inner support structures include herringbone structures and crossed structures. By adopting the pipe, the compressive strength of the hole pipe can be enhanced effectively, the hole collapse resistance is enhanced, the drilling and gas pumping time is prolonged, and the gas pumping efficiency can be increased greatly. The pipe is particularly suitable for soft gas coal seams where collapse of drill holes occurs easily.

Description

technical field [0001] The invention relates to a coal seam drilling anti-collapse hole gas drainage pipe, in particular to an internally supported hole protection pipe suitable for soft coal seam gas drainage and a preparation method. technical background [0002] According to the requirements of the State's "Provisional Provisions on the Standards of Gas Drainage in Coal Mine" (2012), mines with serious gas disasters must conduct gas drainage and achieve drainage standards. However, soft coal seams account for a relatively large proportion of coal seams in my country, and hole collapse in soft coal seams is a major problem restricting gas drainage, which seriously hinders the process of mine gas drainage reaching the standard. There are few effective technical measures for the prevention and control of soft coal seam hole collapse at present, and the method of mainly adopting the hole-protecting pipe is sent into the borehole. This kind of grommet basically all belongs to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 周福宝刘春刘应科王建龙高峰
Owner CHINA UNIV OF MINING & TECH
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