Thick coal seam top and bottom linkage horizontal well subsection seam making, coal washing and outburst eliminating method

Abstract

The invention discloses a thick coal seam top and bottom linkage horizontal well subsection seam making, coal washing and outburst eliminating method. The method comprises the steps that an L-shaped top horizontal well and an L-shaped bottom horizontal well are arranged, hydraulic seam making is conducted through a directional hydraulic perforation tool dragged by an oil pipe with a bottom seal, circulating pulse well washing and coal drawing are conducted on connected cracks, and after seam making and coal washing work of the whole well section is completed section by section, water drainageand pressure reduction gas production are conducted in different wells. Therefore, the outburst elimination construction difficulty and the construction workload of the thick coal seam can be reduced,the outburst elimination standard reaching time is shortened, the comprehensive treatment cost is reduced, and the purposes of rapid and large-range striped pressure relief and outburst elimination of the thick coal seam are achieved.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a method for segmentally creating seams, washing coal and eliminating outbursts in a horizontal well linked to the top and bottom of a thick coal seam. Background technique [0002] In view of the coal and gas outburst problems faced in the process of tunneling in thick coal seams, the current common practice is to develop a bottom drainage roadway first, and then use through-bed holes for gas drainage. This method has the following limitations: (1) the underground space is limited, the construction is difficult, the construction time is long, and it needs to be planned and deployed a long time in advance, and the contradiction between stubbornness and pumping is very prominent; High-efficiency excavation needs; (2) The underground construction conditions are poor, and the construction technology of the through-layer hole is limited, resulting in a small impact area of ​...

AI Technical Summary

Problems solved by technology

This method has the following limitations: (1) the underground space is limited, the construction is difficult, the construction time is long, and it needs to be planned and deployed a long time in advance, and the contradiction between stubbornness and pumping is very prominent; High-efficiency excavation needs; (2) The underground construction conditions are poor, and the construction technology of the through-layer hole is limited, resulting in a small impact area of ​​the underground drilling. High cost; (3) The construction of long drilling holes in thick coal seams is easy to collapse and bury the drill holes, which is difficult to form and has high construction risks, which also affects the effect of gas drainage in the later stage

[0003] To sum up, at present, there are heavy construction workload, great difficulty, long drainage time, low extraction efficiency, high extraction cost, and contradictions in time and space in the drainage of the drainage hole through the bottom of the thick coal seam. Outburst and other problems, it is difficult to achieve the goal of rapid and large-scale strip outburst elimination, which seriously affects the safe and efficient excavation of thick coal seam roadways

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