Coal mine working face top plate high position directional drill hole group pressure relief gas extraction method

Abstract

The invention discloses a coal mine working face top plate high position directional drill hole group pressure relief gas extraction method. According to the principle, the coal mine working face topplate high position directional drill hole group pressure relief gas extraction method comprises the steps that before a working face is stoped, by constructing a high position directional drill holegroup along the working surface in an air return way of the working surface, main hole sections of high position directional drill holes are extended in an O-shaped circle fissure zone of a goaf formed after the working face is stoped, and lower position drill holes are appropriately lowered at the position of open-off cut close to the working face, crossing branch holes facing upward are constructed in upper position drill holes, after the working face is mined by adopting the combining extraction of all drill holes, gas guiding of the fissure zone is carried out, and pressure relief and desorption of gas in the fissure zone are carried out. The coal mine working face top plate high position directional drill hole group pressure relief gas extraction method can play a dual role of reducing the gas concentration in the corners of the working surface and in the return current and extracting high-concentration gas in the pressure relief and desorption zone of the goaf, gas control of theworking face is achieved, and the recycling of gas resources is realized.

Description

technical field [0001] The invention relates to a gas drainage method, which belongs to the field of underground gas control and gas drainage in coal mines, and in particular to a pressure relief gas drainage method for a group of high-level directional drilling holes on the roof of a coal mining face. Background technique [0002] The geological conditions of my country's coal fields are complex, which can easily lead to various major safety accidents. Among them, the gas associated with coal and existing in coal seams is one of the biggest disaster-causing factors that threaten the safety of my country's coal mines. At the same time, gas is a clean and efficient energy source. If these gas resources are effectively extracted, it will greatly alleviate the energy shortage in our country. Therefore, no matter from the perspective of ensuring mine safety production or resource utilization, coal mine gas should be extracted. [0003] During coal mining, due to the pressure di...

AI Technical Summary

Problems solved by technology

The excavation of high-level pumping roadway requires a large amount of excavation, long construction period, and high cost; the pipeline of the return air buried pipe is easily crushed by the overlying rock that falls across, and the drainage effect is not good; The drilling trajectory is uncontrollable, and the drilling trajectory cannot be guaranteed to extend in the fracture zone; the construction of L-shaped wells in the ground mining area is difficult and costly, and the construction conditions are affected by the topography

[0005] In addition, the existing methods of gas drainage in the goaf of the working face can only extract the gas in the air-conducting fracture zone of the goaf, and this part of the gas is mixed with a large amount of air introduced by the ventilation of the working face, so it is difficult to realize resource utilization of the extracted gas

Images