Gas extraction well location method based on overlying rock fracture shell

A technology of drilling layout and gas drainage, which is applied in the direction of gas discharge, safety devices, mining equipment, etc., can solve the problems of short effective drainage time, poor safety, disadvantages, etc., and achieve the reduction of drilling and drainage process and simplify the process Technical links, the effect of saving money

Inactive Publication Date: 2013-06-19
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Some drainage methods in mining fracture areas need to drill a separate roof drainage roadway, and use roof roadway drilling or roof roadway for pressure relief gas drainage. These methods increase the amount of gas control engineering and investment, and the drainage roadway It is itself a gas accumulation area with poor security
In addition, i

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  • Gas extraction well location method based on overlying rock fracture shell
  • Gas extraction well location method based on overlying rock fracture shell

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Embodiment Construction

[0020] Such as figure 2 The present invention is based on the principle diagram of the gas drainage drilling layout of the overlying stratum fissure shell, and the present invention divides the gob overlying strata from bottom to top into a low-position fissure shell 1, a middle-position fissure shell 2, and a high-position fissure shell 3. The low-level fractured shell 1 is mainly the vertical fracture development area of ​​the goaf, which is located in the upper part of the caving zone and the lower part of the fractured zone, and has strong vertical penetration. The low-level fractured shell near the working face 4 area is affected by the air leakage of the goaf Larger, the pressure relief gas in the upper and adjacent layers is easy to flow into the caving area 5 under the action of ventilation negative pressure; The lower part of the subsidence zone has strong connectivity in the horizontal direction and is less affected by the air leakage of the goaf. It is a stable ac...

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Abstract

The invention discloses a gas extraction well location method based on an overlying rock fracture shell. The gas extraction well location method based on the overlying rock fracture shell is characterized by comprising the step of drilling tilting holes with large diameters in multiple areas of a gob overlying rock from a gas tail lane (6) directly. The multiple areas of the gob overlying rock comprise a low post fracture shell (1), a middle post fracture shell (2) and a high post fracture shell (3) from bottom to top, wherein the low post fracture shell (1) is a gob fracture vertical destroying development zone, the high post fracture shell (3) is a gob separation layer fracture and micro fracture development zone, and the middle post fracture shell (2) is located between the high post fracture shell and the low post fracture shell. The construction of extracting and drilling is carried out directly by using the existing gas tail lane, and extraction drilling holes are respectively arranged in the multiple areas of the overlying rock. Not only can gas with high concentration be effectively extracted, but also a seepage field on a gob return air side zone is interfered. Extraction efficiency is high, the processes of digging, drilling and drainage lane are reduced, the link of process engineering is simplified, and cost is lowered.

Description

technical field [0001] The invention relates to the field of gas drainage in coal mines, in particular to a drilling arrangement method for gas drainage in overlying strata in goafs. Background technique [0002] At present, according to the theory of mine pressure strata control, the overlying strata of the goaf are generally divided into "three vertical zones" and "three horizontal zones" according to the characteristics of mining cracks in the overlying strata of the goaf. The "three vertical zones" can be divided into the curved subsidence zone, the roof fissure zone and the caving zone from top to bottom. Drainage is mainly aimed at the fractured zone development area. For example, the Chinese patent application No. 03113021.6 discloses a "Method of Gas Drainage from the Roof of the Mined Coal Seam", on the roof of the mined coal seam, for the desorbed gas that comes from the mining and pressure relief coal seam and collects in the "annular fracture circle" through the ...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 何富连谢生荣张守宝
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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