Coal bed gasification method and coal bed gasification furnace based on branch well

Abstract

The invention discloses a gasification method and gasification furnace of coal seams based on branch wells, and aims to solve the problems that a gasification technique of coal seams is high in cost and low in recovery ratio in the prior art. The gasification method comprises the following steps: after finishing drilling construction, enabling gasification channels to be run-through, respectively downwards placing packers or guidance devices in different branch wells, downwards placing gas injecting devices in corresponding branch wells through the guidance devices, injecting a gasifying agent, confirming the gasifying time of coal seam regions to be gasified through calculation, and completing the gasifying process of the coal seam regions to be gasified; replacing the packers or the guidance devices in the branch wells, completing the gasifying process of the coal seam regions to be gasified of all branch wells, and outputting generated fuel gas to the ground through gas exhaust wells. Through the adoption of the gasification method disclosed by the invention, the fixed point quantitative controllable injection of the gasifying agent is realized, the process of gas generation is stable, the demands of the deep processing of fuel gas are satisfied, the gasification coal mining output and the recovery ratio of single well are effectively increased, besides, the service life of each gas injection well is prolonged, the cost of building furnaces and drilling is reduced, and the cost of ground construction and operation is reduced.

Description

technical field [0001] The invention belongs to the technical field of coal resource mining, and in particular relates to a coal bed gasification method and a coal bed gasification furnace based on branch wells. Background technique [0002] With the rapid development of the national economy, the amount of coal resources mined in my country has increased rapidly, the shallow and easy-to-mine coal has gradually decreased, the depth and difficulty of mining have continued to increase, and the cost of conventional well construction and coal mining has become higher and higher. Coal bed gasification (UCG, Underground Coal Gasification) technology has emerged due to the rich coal bed methane in coal seams and the exploitation of coal resources. [0003] At present, coalbed gasification (UCG, Underground CoalGasification) technology is mostly used in the mining process of coal resources in my country. When using UCG technology to mine underground coal seams, it is necessary to dr...

AI Technical Summary

Problems solved by technology

When using UCG technology to mine underground coal seams, it is necessary to drill wells from the ground and build coal seam gasifiers in the coal seams to be gasified. When using conventional vertical wells and directional wells to build coal seam gasifiers in deep coal seams or complex coal seams, mining Compared with conventional coal mining methods, UCG technology needs to meet higher technical standards, so UCG technology mining coal seam construction is difficult and costly

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