Low-permeability high-outburst coal seam systematic gas production method

Abstract

The invention discloses a low-permeability high-outburst coal seam systematic gas production method. The low-permeability high-outburst coal seam systematic gas production method comprises the following steps that 1, a well field is divided into a planning area, a preparation area and a production area; 2, the planning area adopts ground drilling pressure relief permeability increasing per-pumping; 3, the preparation area adopts well up-down combined fracturing pressure relief permeability increasing extraction; and 4, the production area adopts a mining activity pressure relief coordinated hydraulic integrated extraction technology. According to the low-permeability high-outburst coal seam systematic gas production method, planning area ground drilling pressure relief permeability increasing extraction, preparation area well up-down combined hydraulic fracturing pressure relief permeability increasing extraction and production area mining activity pressure relief permeability increasing extraction are used as key links, removing of low permeability restricting gas efficient flow is used as a basic starting point, and through two kinds of permeability increasing types of artificialactive pressure relief and passive pressure relief influenced by mining activity, three-area linkage stereoscopic extraction is conducted on gas of the coal mine planning area, the preparation area and the production area; and a three-area linkage stereoscopic pressure relief permeability increasing efficiency extraction mode of gas production and then coal mining is formed, so that coordinated development of coal and the gas is achieved.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas control, and in particular relates to a systematic gas mining method for low-permeability and high-outburst coal seams. Background technique [0002] my country is not only rich in coal resources, but also an important coal producer and consumer in the world. For a long time to come, coal will still account for a large proportion of my country's energy structure. For a long time, while ensuring my country's energy demand and rapid economic development, coal has been facing many safety mining problems. Although the safety production situation of my country's coal mines has improved significantly in recent years, the death rate per million tons of coal in the country is still around 0.2, compared with developed countries. Compared with other countries, there is still a big gap, and serious accidents still occur from time to time. Especially with the gradual increase of mining depth, the mining...

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Problems solved by technology

In particular, the mechanism of coal and gas outburst is extremely complex, and the theoretical understanding of its occurrence worldwide is still in the stage of "hypothesis". Although the means and measures of prevention and control are extremely rich, it is difficult to fundamentally prevent the occurrence of prominent

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