A dredging and re-draining method for borehole collapse in coal seam gas drainage

Abstract

The invention belongs to the field of coal mine safety, and relates to a dredging and re-draining method for coal seam gas drainage borehole collapse. If it is a soft coal seam, a gear conveying device is opened to transport the threaded outer rod with the cutting part of the soft coal seam to the place where the collapse occurs. The high-pressure air inside the threaded outer rod drives the rotating blades to rotate, and then drives the ellipsoid drill bit to rotate and penetrate the collapsed coal body; if it is a hard coal seam, the rubber hose with an air motor and hard coal drill bit is conveyed to the collapsed place, and conveyed by high-pressure air The pipe enters the air intake end of the air motor, and then drives the rotating blade to rotate, so that the rotating shaft rotates and drives the hard coal drill bit to rotate to cut the collapsed coal; Then the corresponding device can be exited; through the unique drilling process, the coal body at the collapsed place can be penetrated, the drainage property of the drilling hole can be restored, the gas drainage efficiency of the mine can be effectively guaranteed, and the occurrence of gas accidents can be effectively prevented.

Description

technical field [0001] The invention belongs to the field of coal mine safety, and relates to a dredging and re-drainage method for coal seam gas drainage borehole collapse. Background technique [0002] Coal mine gas is an unconventional natural gas that is associated with coal and is mainly stored in coal seams in an adsorbed state. Its main component is methane, and a small amount of ethane, propane and butane. And water vapor, and trace amounts of inert gases, such as helium and argon. Gas is the main threat to safe production in mines. At present, my country mainly adopts the methods of ground drilling drainage and underground gas extraction in coal mines to control mine gas disasters. In the process of using underground gas drainage in coal mines to implement mine gas disaster control, it is necessary to use drilling rigs in coal mines to drill holes for gas drainage in coal seams. Therefore, it often leads to the phenomenon that the borehole collapses after the cons...

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Problems solved by technology

[0004] In view of this, the present invention provides a coal seam gas drainage drill in order to solve the problem that after the construction of the underground gas drainage borehole in the coal mine is completed, the gas drainage borehole fails due to collapse and blockage of the borehole, which leads to gas accidents. The dredging and re-drainage method of hole collapse, through the unique drilling technology, penetrates the coal body at the collapsed place, and then restores the drainage properties of the borehole, effectively guarantees the gas drainage efficiency of the mine, and effectively prevents the occurrence of gas accidents

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