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Method for improving hole sealing effect based on drilled surrounding rock fracture structure

A fissure and hole sealing technology, which can be used in earth-moving drilling, sealing/sealing, gas discharge, etc.

Inactive Publication Date: 2017-01-25
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, during the gas drainage process, due to the large amount of water in the coal body, the drainage holes on the gas drainage pipes are easily blocked by coal slurry, resulting in a greatly reduced drainage efficiency

Method used

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  • Method for improving hole sealing effect based on drilled surrounding rock fracture structure
  • Method for improving hole sealing effect based on drilled surrounding rock fracture structure
  • Method for improving hole sealing effect based on drilled surrounding rock fracture structure

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Embodiment Construction

[0023] Such as Figure 1-Figure 4 As shown, the method for improving the sealing effect based on the crack structure of the drilling surrounding rock of the present invention comprises the following steps:

[0024] 1) First, confirm the U-shaped pressure-relieving coal mass area 5 affected by the roadway excavation, and obtain the annular pressure-relieving coal mass area 6 produced by the drilling from various parameters of the borehole, and then obtain the concentration of the coal mass affected by the borehole drilling. Coal body fracture area 7 that is jointly affected by the fractured zone caused by the influence of stress and the stress concentration zone caused by roadway excavation; figure 1 The winning mark 4 is the coal body that is not affected by roadway excavation and drilling;

[0025] 3) According to the geological characteristics of the coal field, analyze the development of primary fractures in the coal body structure, consider the stress of the surrounding r...

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Abstract

A method for improving the hole sealing effect based on a drilled surrounding rock fracture structure comprises the following steps that a crushed zone, generated due to the influence of roadway tunneling, of surrounding rock suffers from secondary influence in the hole drilling process, radial fractures are generated on a coal wall, besides, a large number of primary fractures are expanded again in the coal seam forming process, a large number of macroscopic and microcosmic hole channels can be formed in the extraction process, air enters the paths for extraction and hole drilling during negative pressure extraction, and then a pipeline is extracted. The drilled surrounding rock fractures are sealed at reasonable length by analyzing the range of the crushed zone generated due to hole drilling tunneling, an expandable hole sealing material high in strength and good in liquidity is adopted, the hole sealing length is properly controlled, and the hole sealing effect and the hole sealing quality are effectively improved. The proper hole sealing section position and hole sealing material are selected, the air leakage channels of hole drilling are reduced, it is avoided that air in a roadway enters an extraction device along the hole drilling fractures, the hole sealing material and cost are reduced, and the concentration and extraction efficiency of hole drilling extraction gas are improved.

Description

technical field [0001] The invention belongs to the technical field of hole sealing for gas drainage in coal seam drilling, and in particular relates to a method for improving the hole sealing effect based on the crack structure of the surrounding rock of the drilling hole. Background technique [0002] At present, the pre-extraction of coal seam gas by underground drilling in coal mines is the main technology for regional gas control, but the concentration of gas extracted by drilling holes is low, which seriously affects the effect of coal seam gas drainage. The reason is that a large number of primary cracks are further developed under the joint influence of the roadway stress concentration area and the borehole fracture area, and a large number of new cracks are generated at the same time. The development of coal fractures in the hole wall is the result of the combined effect of the existence of a large number of primary fractures in the coal and rock mass and the stress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B21/16E21F7/00
CPCE21B21/16E21B33/13E21F7/00
Inventor 张明杰李博刘伟冯阵东谭志宏贾文超
Owner HENAN POLYTECHNIC UNIV
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