Multilayer coal seam gasification furnace and coal seam gasification method

Abstract

The invention discloses a multilayer coal seam gasification furnace and coal seam gasification method; the coal seam gasification furnace comprises the following structures: a gas-injection well, and each coal seam at least comprises one branch well connected with the gas-injection well; a gas outlet well; a gasification path; a blocking device; a guide device; a gas injection device. The blocking device is placed to a branch window of the branch well and used for blocking the branch well; the guide device is placed in the branch window of the branch well, and used for guiding the gas injection device into the branch well; the blocking device can separate and control different branch wells; the gas injection device can control a gasification process of different coal seam zones through different gas injection points of different branch wells under the guide device effect, thus realizing gasifying agent fixed point and quantification injection, controlling the gasification process of the multilayer coal seam, and preventing mutual interferences between the coal seams in the coal seam gasification process; the multilayer coal seam gasification furnace and coal seam gasification method are stable in a gas production process, improve coal seam recovery rate, reduce drilling well quantity, and reduce gasification exploitation cost.

Description

technical field [0001] The invention belongs to the technical field of coal resource mining, and in particular relates to a multilayer coal seam gasifier and a coal seam gasification method. Background technique [0002] Coal resources are one of the natural energy sources for human survival. The survey of coal resources found that due to the influence of the sedimentary environment and the geological structure of the surrounding areas, the coal seams in most coalfields present various shapes and irregular states of various qualities, which are manifested as multi-layer coal seams, and some coalfields have multiple coal seams. mineable coal seams. With the rapid development of the national economy, the amount of coal resources mined in my country has increased rapidly, the coal that is easy to mine in shallow areas 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...

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Problems solved by technology

[0003] Existing UCG technology research mainly focuses on the gasification mining of a single coal seam, and there are no relevant reports on the mining technology research involving multi-layer coal seams

When the existing UCG technology is applied to the mining of underground multi-layer coal seams, wells need to be drilled from the ground, and coalbed gasifiers are built in the coal seams to be gasified. Each coalbed gasifier can only gasify a single coal seam where it is mined. When large-scale mining is carried out, multiple drilling wells are required to build furnaces in each coal seam at the same time, which has the disadvantages of a large number of drilling wells and a large area. Furnaces interfere with each other, which is not conducive to the full mining of coal seams

[0004] At the same time, because the existing UCG technology is affected by the mining depth and ground environment, it has higher standard requirements than conventional coal mining technology. In deep coal seams or complex coal seams, conventional vertical wells and directional wells are used to construct coalbed gasifiers. Disadvantages of high cost, difficult construction and low recovery rate

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