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Special protection pipe for ground well holes in gas drainage in mining areas

A technology for gas drainage and mining areas, which is applied in the field of special protection pipes for gas drainage ground wells in mining areas, and can solve problems such as rock force damage

Active Publication Date: 2019-03-01
SHANDONG UNIV OF SCI & 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 special protection pipe for the surface wellhole of gas drainage in the mining area, so as to solve the technical problem that the ground wellhole of the gas drainage in the mining area is easily damaged by the force of the rock formation

Method used

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  • Special protection pipe for ground well holes in gas drainage in mining areas
  • Special protection pipe for ground well holes in gas drainage in mining areas
  • Special protection pipe for ground well holes in gas drainage in mining areas

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Embodiment Construction

[0028] Such as Figure 1 to Figure 7 As shown, this embodiment provides a special protection pipe for gas drainage ground well holes in the mining area, and the special protection pipe for gas drainage ground well holes in the mining area is arranged in the ground well holes for gas drainage in the mining area. In the process of gas drainage in the mining area, in the ground drilling (well) hole, a stainless steel casing with certain flexibility is installed at the position where the rock formation is prone to lateral movement, up and down expansion and stretching, lateral extrusion, and longitudinal extrusion. . The stainless steel sleeve 1 can achieve a certain degree of flexible deformation. A chain is arranged inside the casing 1 , and the chain can slide relative to the casing 1 . The chain includes several chain cylinders 2 and connecting pieces that movably connect adjacent chain cylinders 2. The chain can be bent with the bending of the sleeve 1, and automatically sl...

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Abstract

The present invention proposes a special protection pipe for gas drainage ground wellholes in the mining area. The special protection pipe for gas drainage ground wellholes in the mining area is arranged in the ground wellhole for gas drainage in the mining area. The special protection pipe for gas drainage ground wellbore includes casing and a chain arranged in the casing and can slide relative to the casing. The chain includes several chain drums and connecting pieces that movably connect adjacent chain drums. There are several ventilation holes in the axial direction. Beneficial effects of the present invention: it can simultaneously resist the change and failure of the casing caused by the shear force, extrusion force and tensile force caused by the displacement of the rock formation, no matter what happens to the protection area in the ground wellbore of the gas drainage area in the mining area The displacement and various forces can keep the gas passing under any force or multiple forces. Compared with traditional protection methods and devices, it is versatile, economical and applicable.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mine mining areas, in particular to a special protection pipe for well holes on the ground for gas drainage in mining areas. Background technique [0002] Gas drainage is carried out on "places where coal seams have been mined or loosened due to other reasons", which is generally referred to as gas drainage in mining areas. Specifically, it refers to drilling vertically to the top of the coal seam in ground construction, extracting the gas in the pressure relief area in front of the mining face and the gas in the subsequent goaf, and directly drilling in the old goaf to drain the gas in the old goaf. Since the gas drainage in the mining area is pressure relief drainage, the gas is relatively easy to extract. However, because it is a mining area, the drainage drilling channel passing through the rock formation and coal seam in the mining area is easily damaged by forces such as displa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00
CPCE21B17/00E21B17/1007E21B17/18E21F7/00E21B17/10E21B41/00
Inventor 陆伟胡千庭程卫民李金亮王栋刘震
Owner SHANDONG UNIV OF SCI & TECH
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