Well drilling arrangement method for extracting gas by imitating beech leaf vein structure

Abstract

The invention provides a well drilling arrangement method for extracting gas by imitating a beech leaf vein structure, and relates to the technical field of mine gas harnessing and utilizing. The well drilling arrangement method for extracting the gas by imitating the beech leaf vein structure conducts arrangement on a gas extraction drill hole by imitating the arrangement mode of a beech leaf vein in a leaf blade and mainly comprises the following steps that 1, the position of a well mouth of well drilling is selected; 2, construction is conducted on a main well of gas extraction well drilling by imitating the beech leaf vein structure; and 3, construction is conducted on branched wells of gas extraction well drilling by imitating the beech leaf vein structure. According to the well drilling arrangement method for extracting the gas by imitating the beech leaf vein structure, the positions of the main well and the branched wells are arranged according to the beech leaf vein structure, the range met by the well drilling lengths of the branched wells is given, and the well drilling construction length is reasonably reduced; and high-efficiency outburst elimination on a low-permeability coal seam is achieved, the coal seam gas extraction efficiency is improved, the gas emission quantity of a working face is reduced, the dangerousness of a coal seam outburst is eliminated, and the coal mine production safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of mine gas control and utilization, in particular to a gas drainage drilling layout method imitating the vein structure of beech leaves. Background technique [0002] With the development of the world economy, human beings are increasingly dependent on fossil energy, and large and extra-large mines have been put into operation in recent years. Mine gas is one of the important factors restricting the production and development of coal mines in my country. Gas accidents can cause hundreds of deaths and even destroy the entire mine. For the safe production of coal mines, gas is a kind of disaster gas, but from the perspective of resource utilization, gas is also a kind of clean energy. After burning, gas will not produce harmful gases and smoke that pollute the atmosphere. At the same time, methane is released during the combustion process. The heat is higher than that of coal. [0003] Gas drainage is the m...

AI Technical Summary

Problems solved by technology

[0004] The traditional method of gas drainage is to construct gas drainage in the original coal seam through the pre-excavated roadway. These drilling arrangements require that the drainage roadway be excavated in advance, and the number of sealed holes is large and As the load at the end of the roadway affects the development of cracks around the borehole, air enters the drainage system, resulting in low gas concentration in the drainage

[0005] In recent years, with the improvement of drilling tool design, improvement of drilling tool performance and optimization of drilling operation mode, the level of directional drilling technology has been significantly improved, and the gas drainage technology of multi-branch horizontal wells has been popularized and applied in many places, but its In terms of drilling layout, it is often based on engineering experience without specific basis. In order to ensure mine safety, people often rely on blindly increasing the drilling density to fully relieve the pressure of the coal seam, which increases a lot of unnecessary engineering investment.

Images