Construction method for achieving blowout prevention during drilling pressure relief of mine

Abstract

The invention discloses a construction method for achieving blowout prevention during drilling pressure relief of a mine. According to the construction method for achieving blowout prevention during drilling pressure relief of the mine, firstly, two steel pipes with the same diameter are combined together through a flange plate, one steel pipe serves as a hole mouth fixing pipe which is inserted into a drilled hole, the other steel pipe serves as a blowout prevention pipe arranged outside the hole, a circular plate with an insertion hole is welded to one end of the blowout prevention pipe, the diameter of the insertion hole needs to meet the requirement that a drill bit can right pass through the insertion hole, two to four pressure relief holes are machined in the side face, facing downwards, of the blowout prevention pipe, and a protection pipe is welded to each pressure relief hole; an installation hole is firstly formed in the position where a hole needs to be drilled, and the hole mouth fixing pipe is installed and fixed in the installation hole; a drill stem of a drilling machine is inserted into an insertion hole of a blowout prevention device and extends to the bottom of the insertion hole, and then the drilling machine can be started normally to conduct drilling; in this way, coal and rock particles and gas are splashed into the blowout prevention pipe from the drilled hole at a high speed, and impact pressure of the gas is relieved through the pressure relief holes. According to the construction method for achieving blowout prevention during drilling pressure relief of the mine, through the blocking function and the buffering function of the blowout prevention device, the problems of coal and rock particle splashing and gas impact are effectively solved during drilling pressure relief of the mine.

Description

technical field [0001] The invention relates to a mine drilling pressure relief method. Background technique [0002] At present, in the mining of coal mines containing gas, rock burst has always been a major safety issue that threatens the normal production of coal mines. Existing solution is drilling pressure relief method. That is to drill a hole for pressure relief in a specific location of the coal wall, and at the same time inject water into the hole to a certain pressure for pressure relief. During the operation of the drilling rig, a large amount of gas often gushes out, resulting in impact pressure and the phenomenon of drilling holes. Cannot continue. Contents of the invention [0003] In order to solve the problems of gas impact and coal rock particle splashing during mine borehole pressure relief, the invention designs a construction method for preventing blowout. [0004] A construction method for blowout prevention and anti-scouring during mine borehole p...

AI Technical Summary

Problems solved by technology

During the operation of the drilling rig, a large amount of gas often gushes out, resulting in impact pressure and the phenomenon of drilling holes. can't continue

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