Joint gas extraction method combining two-way stereo interlaced hole drilling with collaborative directional long hole drilling

Abstract

The invention relates to a joint gas extraction method combining a two-way stereo interlaced hole drilling with collaborative directional long hole drilling. The method comprises the following steps that in the tunneling process of back production of the working face roadway in coal mine underground, long distance directional drilling is constructed along the inclination of a back production working face track crossheading, and coal bodies belonging to the back production working face transportation crossheading and a crossheading of the working face to be mined is pre-pumped. The gas extraction drill hole in the coal seam is constructed along the inclination of the back production working face along with the driving of the back production working face track crossheading. In the process ofdriving the back production working face transportation crossheading, and the exposed long distance directional drill hole is sealed by applying a hole sealing material, at the same time, a gas extraction drill hole of the coal seam is constructed along the inclination direction in the back production working face transportation crossheading, and the gas extraction drill hole of the coal seam inthe back production working face transportation crossheading and the gas extraction drill hole of the coal seam in the back production working face track crossheading can form a plane or a three-dimensional cross. The joint gas extraction method combining the two-way stereo interlaced hole drilling with the collaborative directional long hole drilling improves the efficiency of coal mine gas disaster control, reduces the construction quantity of gas control project in the coal mine underground, and has extremely high technicality and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of gas drainage, and relates to a method for combining two-way three-dimensional staggered drilling and directional long drilling to jointly extract gas. Background technique [0002] With the rapid development of my country's national economy, the demand for energy is also increasing day by day. However, my country is a country poor in oil, low in gas, and rich in coal, so coal has long occupied the main position of my country's primary energy consumption. However, the depth of coal mining in my country is gradually increasing, and the degree of coal and gas dynamic disasters is showing a rising trend. my country's coal industry generally adopts mining protective layers or large-scale drainage methods to implement mine gas disaster control. However, some mines do not have the conditions to mine protective layers due to the occurrence of coal seams. Therefore, the use of underground drilling in constructi...

AI Technical Summary

Problems solved by technology

If the drainage boreholes in construction do not penetrate the gangue layer, there will inevitably be a certain blind area of ​​drainage, which will affect the gas drainage effect of medium-thick coal seams

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