Large-dip-angle long drilling construction process for broken soft coal seam

Abstract

The invention relates to the technical field of large-dip-angle drilling construction, and discloses a large-dip-angle long drilling construction process for broken soft coal seam broken soft coal seam. The large-dip-angle long drilling construction process comprises the following steps that (1) drilling equipment is prepared and comprises a drilling machine, a drilling rod, a drilling bit, a hole sealing pipe, an air compressor, an air storage tank and an orifice deslagging mechanism, and the orifice deslagging mechanism comprises a dust separator, a sprayer and a cylindrical dust collector; (2) drilling is performed, wherein the drilling machine drives the drilling rod and the drilling bit to rotate so as to drill holes; and (3) in the deslagging and drilling process, compressed air generated by working of the air compressor passes through the air storage tank and then is fed into the sprayer, a water supply pipeline is additionally connected to the upper portion of the sprayer, water entering the sprayer is atomized by the compressed air and then enters the bottom of the hole through the drill rod, large-particle-size particles in the air carrying coal cinder directly fall off at a hole opening, and fine dust is adsorbed and removed by the cylindrical dust collector. According to the large-dip-angle long drilling construction process, drilling cuttings in the drilling hole can be discharged in the drilling process.

Description

technical field [0001] The invention relates to the technical field of large-inclination-angle drilling construction, in particular to a construction technique for large-inclination-angle long drilling in broken soft coal seams. Background technique [0002] Gas pre-extraction in low-permeability broken soft outburst coal seams has not yet formed a complete and feasible technology and supporting drilling tools. The reason is that it is difficult to form holes in broken soft coal seams, especially in areas with high ground stress. Drilling construction is very difficult. In-hole accidents such as injection holes, collapsed holes, and drill sticking are prone to occur, resulting in low hole formation rate and shallow hole depth. So far, in the practical application of most coal mines in my country, the drilling depth of gas drainage in broken and soft coal seams is mostly 30-40m, generally not exceeding 60m, which seriously restricts the safe production of coal mines. [0003...

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Problems solved by technology

[0003] Aiming at the problems of difficult hole formation, shallow hole depth, and poor drainage effect in conventional rotary drilling using water as the flushing medium for drilling in broken and soft coal seams, coal mines in my country have gradually adopted air drilling technology to solve the problem of drilling holes in broken and soft coal seams along the bedding. In 2006, the Xi’an Research Institute of the Coal Research Institute undertook one of the National Development and Reform Commission’s “Coal Mine Gas Comprehensive Control and Utilization Key Technology Development and Equipment Development” project “Development and Development of Wind Pressure Air Drilling Equipment in Broken and Soft Coal Seams” Supporting process development", after nearly three years of research and research, important progress has been made in the development of drilling tools, the optimization of related supporting equipment, and the development of supporting processes. However, its theoretical analysis is only aimed at the level or near coal mine underground For horizontal drilling, there is no research on the downward long drilling process at high inclination angles, and no theoretical system for the long downward drilling process at high inclination angles has been established.

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