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A Method for Draining Gas in Multiple Goafs Combined with Short Shafts and Boreholes

A goaf and vertical well technology, used in gas discharge, earth-moving drilling, directional drilling, etc., can solve problems such as large engineering volume and many pipelines, and achieve the effects of strong applicability, huge promotion value, and considerable economic benefits.

Active Publication Date: 2020-07-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For multiple mined-out areas with a length of more than 1500m in the original working face, if single drilling is continued for drainage, the engineering volume will be large, and more pipelines need to be arranged to form centralized transportation on the ground

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  • A Method for Draining Gas in Multiple Goafs Combined with Short Shafts and Boreholes
  • A Method for Draining Gas in Multiple Goafs Combined with Short Shafts and Boreholes

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Embodiment Construction

[0016] refer to figure 1 and figure 2 And in conjunction with embodiment, the present invention is further elaborated, and a mine in Jincheng, Shanxi mines No. 2, No. 3, and No. 6 coal seams. The coal mining method is a comprehensive mechanical direction longwall type, and the average inclination angle of the coal seam is less than 8°. The mine mining area prepares the roadway panel area single-story layout. The overlying No. 2 coal seam has been mined. The thickness of the coal seam is 1.5-2.4 m, with an average of 1.9 m. The No. 2 coal is high-quality anthracite, and a large amount of gas resources are expected to remain in the goaf. The thickness of the topsoil layer on the No. 2 coal seam is 180-420 m, with an average of 300 m. The original coal seam has two mining areas, and each mining area has more than ten working faces. The average advancing length of the original working face is 1800 m. For efficient drainage and utilization of gas resources in these goafs, the in...

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Abstract

The invention relates to a short shaft and boring combined multi-goaf gas extraction method, belongs to the field of goaf gas extraction utilization, and aims at solving the problem that extraction, via single drilling well, in multiple goafs with a relatively large working face is large in engineering amount and needs layout of a lot of pipelines in the ground. According to the method of the invention, a short shaft is constructed downwardly in the vertical direction, extraction bores are constructed in a fissure zone 10-30m over the goafs on the basis of the shaft, and gas extraction is carried out. Via the method, gas in multiple goafs can be extracted simultaneously aimed at production practicality of a large goaf cluster, the economic benefit is high, and the method is worthy of popularization.

Description

technical field [0001] The invention belongs to the field of gas drainage and utilization in goafs, and in particular relates to a method for gas drainage in multiple goafs combined with short vertical shafts and boreholes. Background technique [0002] With the popularization and application of comprehensive mechanized coal mining methods, the advance length of coal mining face is constantly breaking new records. Generally, the advance length of fully mechanized mining face can reach more than 1500m, and the speed of coal mining is also accelerating. These working faces are very Soon a large number of gobs with huge area and regular distribution were formed. Moreover, 70% of the goafs in my country are high-gas goafs, and these clustered goafs contain extremely considerable reserves of gas resources. As a harmful gas, the greenhouse effect of gas emitted into the atmosphere is 21 times that of carbon dioxide. Once these massive gases escape from the goaf due to surface sub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/12E21B43/34E21B7/04
CPCE21B7/04E21B43/121E21B43/34E21F7/00
Inventor 冯国瑞崔家庆李振姜海纳宋诚牛小红胡胜勇韩艳娜
Owner TAIYUAN UNIV OF TECH