Construction method for coal mine downhole mining gas extraction roof plate pitch-up through stratum directional hole

Abstract

The invention relates to a construction method for a coal mine downhole mining gas extraction roof plate pitch-up through stratum directional hole. By using a drill site in a tunneled air inlet roadway of a working face adjacent to a working face to be mined, equipment such as pilot directional drill tools and impact composite reaming drill tools, a multi-stage revolving reaming process, a sliding directional drilling process, a composite directional drilling process and an impact composite reaming process, the roof plate pitch-up through stratum directional hole is obtained. The roof plate pitch-up through stratum directional hole enters a roof plate mining fissure zone and a separation area in advance and extends for a long distance at a large diameter. After drilling construction and during recovery of the working face to be extracted, an upward fracture formed in a roof plate stratum under the influence of mining communicates with the roof plate pitch-up through stratum directional hole, gas generated during mining enters the roof plate pitch-up through stratum directional hole, and therefore extraction and use of mining gas is realized. The defects that an existing mining gas extraction drilling hole is small in aperture, the extension distance of a fracture zone is short, the drilling efficiency is low, the cost is high, and the construction period is long are overcome, and the mining gas extraction effect is improved.

Description

technical field

[0001] The invention relates to a directional hole construction method and equipment, which belong to the field of coal mine underground tunnel drilling, in particular to a method for constructing directional holes on an upward penetration layer on an underground gas drainage roof of a coal mine. Background technique

[0002] Coal mine gas disaster is one of the main safety disasters in the process of mine construction and mine production. It is extremely destructive and brings great hidden dangers and losses to coal mine safety production. In recent years, this coal seam gas pre-drainage technology has significantly reduced the coal seam gas content in the working face. However, with the development of comprehensive mechanized coal mining technology in coal mines, the advancement of the working face has accelerated, and the amount of gas emitted during mining has increased sharply, which has become a constraint for some mines. A key factor in safe and effici...

Images