Method for hydraulically drilling high-stress coal

Abstract

The invention discloses a method for hydraulically drilling high-stress coal, comprising the following steps of: distributing hydraulic drilling equipment in an excavating space area; selecting the position for drilling, placing a spray head of the hydraulic drilling equipment towards the hole-forming direction and starting the hydraulic drilling equipment; drilling the coal by using high-pressure water; continuously making the spray head and a high-pressure water pipe penetrate into the coal along with the hole depth in the hydraulically drilling process; when the drilling hole depth meets the design requirement, stopping the hydraulic drilling equipment, retracting the spray head and the high-pressure water pipe and finishing the drilling; and moving the spray head and the high-pressure water pipe to next hole position and continuously drilling the next hole until finishing the drilling of all holes. The method can be used for effectively preventing the drilling impact, the hole bombing and the drilling clamp and solving the problem of difficult high-stress coal drilling, is applied to preventing and controlling the coal and gas outburst, the rock burst and the gas drainage under suction and has the advantages of simple flow, easy operation and high hole-forming speed.

Description

technical field [0001] The invention relates to a method for forming holes in coal bodies by hydraulic punching and drilling, which belongs to the technical field of coal mine disaster prevention and coal mine safety, and is especially suitable for hydraulic punching drilling in high-stress coal bodies. Background technique [0002] When mining in coal mines, or in the prevention and control of coal and gas outburst, rock burst, water damage, gas drainage, water injection, etc., it is necessary to drill holes in the coal body, including detection drilling, pressure relief drilling, and blasting drilling. Drilling holes, water injection drilling and gas discharge or drainage drilling, etc., drilling is usually done with a drilling rig, which belongs to mechanical drilling. However, in high-stress areas such as mining-affected areas, coal pillar areas, and structurally-influenced areas, as well as high-risk areas of dynamic disasters such as rock bursts and coal and gas outbur...

AI Technical Summary

Problems solved by technology

However, in high-stress areas such as mining-affected areas, coal pillar areas, and structurally-influenced areas, as well as high-risk areas of dynamic disasters such as rock bursts and coal and gas outbursts, severe drilling impacts, blast holes, or drill pinching often occur during drilling. Under such circumstances, the coal rock on the drilling wall will be suddenly destroyed or a large amount of slow deformation (rheology or creep) will kill the drill pipe and the drilling operation cannot be completed.

In coal mines with rock burst, severe coal and gas outburst, or high ground stress, coal seam drilling can only be drilled 2 to 4 meters deep, which cannot meet the needs

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