Goaf roof high-position directional borehole gas extraction technology

Abstract

The invention relates to the gas extraction technology, and specifically relates to a goaf roof high-position directional borehole gas extraction technology, and solves problems that the goaf gas extraction is high in extraction cost and low in drivage efficiency and the like. The technical scheme is that a kilometer directional drilling machine is employed to construct high-position boreholes in a mining pressure field on the goaf, one high-position borehole is in the upper part, one high-position borehole is in the middle part, one high-position borehole is in the lower part, the goaf is divided into a coal pillar section and a goaf section, the coal pillar section is actual coal, the goaf high-position boreholes can be constructed in a caving zone and a fissure zone of the coal pillar section, after the boreholes come out from the coal pillar section and enter the goaf section, the boreholes need to be lifted to the fissure zone, and the lifting height is not less than 35 m. By researching the mine pressure rule of the coal working face, three zones of the goaf and the position of the gas enriched zone can be determined, by means of long-distance positioning capability of the directional drilling machine, directional boreholes are constructed in the gas enriched zone in the goaf overlying strata, goaf gas is extracted, and the aim of managing goaf gas is achieved.

Description

technical field [0001] The invention relates to gas drainage technology, in particular to a high-position directional drilling technology on the roof of a goaf. Background technique [0002] Goaf gas is the main source of gas gushing from coal mining face, and it is the focus and difficulty of mine gas control. The most important means of gas control in goaf is gob drainage. At present, the drainage of underground gobs in my country's coal mines is mainly the extraction of rock roadways with high roof and conventional drilling. Drainage of rock roadway with high roof is to excavate a rock roadway above the roof of the coal seam as a special gas discharge roadway. The technology and equipment are relatively simple, the drilling is mainly conventional drilling, the drilling distance is short, and there is no substantial breakthrough in the drainage of long-distance goaf roof high-level drilling. Contents of the invention [0003] In order to solve the problems of high drai...

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Problems solved by technology

[0003] In order to solve the problems of high drainage cost and low driving efficiency in gas drainage in the goaf, the present invention provides a high-position directional drilling technology on the roof of the goaf

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