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Extremely thick coal seam accurate danger relieving and yield increasing method based on directional drilling advanced high-pressure water injection

A technology for directional drilling and thick coal seam, which is applied in earth-moving drilling, wellbore/well components, dust prevention, etc., can solve the problems affecting the safety of roadway excavation construction and coal face mining construction, and achieve the effect of improving pressure relief and degree, strengthen the degree of pressure relief, reduce the effect of dust concentration

Pending Publication Date: 2022-07-05
SHENHUA GUONENG ENERGY GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the demand for pressure relief in layered mining of thick coal seams with strong impact tendencies cannot be met. The reason for rock bursts in thick coal seams with strong impact tendencies is that the coal body is in a state of high stress. Because the coal body is thick and hard, it can accumulate A large amount of elastic energy will impact when the load limit of the coal and rock mass is reached, which will greatly affect the safety of roadway excavation construction and coal face mining construction

Method used

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  • Extremely thick coal seam accurate danger relieving and yield increasing method based on directional drilling advanced high-pressure water injection
  • Extremely thick coal seam accurate danger relieving and yield increasing method based on directional drilling advanced high-pressure water injection
  • Extremely thick coal seam accurate danger relieving and yield increasing method based on directional drilling advanced high-pressure water injection

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Embodiment Construction

[0059] like Figure 1 to Figure 5 As shown in the present invention, the method for accurate risk resolution and production increase of huge thick coal seam based on directional drilling and advanced high pressure water injection is the same as the method for accurate risk resolution and production increase of top coal seam and middle coal seam. The construction method for precise crisis resolution and production increase includes the following steps:

[0060] Step 1. The pressure relief and excavation construction of the roadway:

[0061] The number of described roadways 2 is two, and the two roadways 2 are respectively an air inlet roadway and a return air roadway, and the pressure relief excavation construction method of the two roadways 2 is the same; the specific steps for any roadway 2 to carry out pressure relief excavation construction are as follows :

[0062] Step 101, dividing the roadway area to be constructed into a plurality of roadway sections 3 to be construc...

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Abstract

The invention discloses a precise danger relieving and yield increasing method for an ultra-thick coal seam based on directional drilling advanced high-pressure water injection. The method comprises the steps that firstly, pressure relief tunneling construction of a roadway is conducted; 2, dividing a pressure relief stoping construction section of the stoping face of the coal seam; thirdly, advanced water injection pressure relief construction is conducted on the pressure relief stoping construction section; 4, measuring the impact risk of the current pressure relief stoping construction section; 5, performing supplementary pressure relief on the current pressure relief stoping construction section; 6, the current pressure relief stoping construction section is subjected to stoping construction; and 7, correcting the long-distance directional advanced pressure relief drill hole group of the next pressure relief stoping construction section, and implementing advanced water injection pressure relief stoping construction. According to the method, the roadway section in the high-impact-tendency ultra-thick coal seam is always tunneled in the semi-surrounded water injection pressure relief area, so that the tunnelling speed is increased, and rock burst disasters are prevented; meanwhile, top coal seam water injection softening and pressure relief are achieved, and the purposes of pressure relief and scour prevention are achieved; in addition, the caving property of top coal can be improved, and the coal yield is increased.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for accurately resolving dangers and increasing production of huge thick coal seams based on directional drilling and advanced high-pressure water injection. Background technique [0002] my country is rich in coal resources, and the thickness of the coal seam is large. Especially in the coalfields in the northwest region, there are many extremely thick coal seams, and there are even huge thick coal seams with a single layer thickness of more than 200m. With the further increase in the demand for coal resources, the depth and intensity of coal mining continue to increase, and at the same time, natural disasters such as rock bursts are aggravated. Some mine disasters are coupled and superimposed, and the uncertainty of major risks is high and difficult, and the difficulty of prevention and control is further increased. Especially in the layered fully-mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/10E21D9/14E21B43/26E21F5/04E21C41/18
CPCE21D9/1066E21D9/14E21B43/26E21F5/04E21C41/18
Inventor 谭立刘生优来兴平张建功金波张琪师为战胡艳波崔峰冯港归
Owner SHENHUA GUONENG ENERGY GRP
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