System process for conducting efficient strengthened extraction in surrounding rock

Abstract

The invention discloses system process for conducting efficient strengthened extraction in a surrounding rock. The system process includes that a common drilling machine is used for forming a drill hole through a pneumatic impacter in the surrounding rock, namely a top plate or a base plate, of a coal reservoir, wherein strengthened extraction is planned to be implemented on the coal reservoir, a plurality of spray holes for communicating a coal rock stratum and the drill hole are sprayed through a hydraulic sand blasting perforation method, a plurality of observing holes are distributed with the drill hole as a center, and hole sealing processing is conducted on the drill hole and the observing holes; and fracture is conducted through the drill hole, a fracture affecting range is determined through monitoring pressure change conditions of the observing holes, and operation of draining while extracting with negative pressure through the drill hole and the observing holes is conducted. Preferentially, hole sealing operation is conducted through a grouting hole sealing method. The system process has the advantage that a problem of hole collapsing, drilling machine blocking and the like during hole drilling in a minge layer can be solved; exposing area of a coal mass is increased due to branch holes formed by high-pressure spraying; and hydraulic fracture presses coal and rock mass among cracks, original cracks in a coal layer are fully opened, extend and are communicated with one another, large-range of pressure relief of the coal mass is achieved, and gas extraction rate is improved.

Description

technical field [0001] The invention relates to a local or regional outburst elimination method for easily outburst coal seams, in particular to a systematic process for highly efficient and enhanced drainage in surrounding rocks. Background technique [0002] Traditional underground gas control in coal mines mainly adopts parallel drilling, oblique drilling, grid drilling, shallow hole pressure relief drilling, high-level drilling, goaf buried pipe, layer-penetrating drilling, bedding drilling, Three-dimensional cross-drilling is used for gas drainage, but the effect mainly depends on the original air permeability of the coal reservoir. The drilling volume is large, the concentration of gas drainage is low, and the outburst elimination time is long. In order to improve the air permeability of coal reservoirs, hydraulic measures such as high-pressure water jet reaming, hydraulic extrusion, deep-hole high-pressure water injection, hydraulic slotting, hydraulic punching, and h...

AI Technical Summary

Problems solved by technology

However, for strip gas in the coal mining roadway, the cutting time is long due to the large cutting range, resulting in long preparation time and low efficiency for roadway excavation

Therefore, the existing coal seam gas pre-extraction met...

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