Controllable jet punching pressure relief device and method for soft coal seam

Abstract

A controllable jet punching pressure relief and anti-reflection device for soft coal seam and its method, the device may include a blowout protection hole screen, an end cover, a solid pipe for sealing holes, an orifice flange, an air slag water separator, The high-pressure reverse rotation nozzle, high-pressure pipe and high-pressure supply assembly, the orifice flange is set on the orifice, the sealing pipe and the blowout protection hole screen are set on the hole wall, and the end cover is set on the At the bottom of the hole, the high-pressure pipe extends into the hole from the flange of the orifice and the end is provided with a high-pressure reverse rotation nozzle. The rear end of the high-pressure pipe is connected to the high-pressure supply component, and the orifice is provided with an air slag water separator Thereby, the present invention is convenient to obtain materials, easy to operate, and the implementation process is safe and controllable, can improve drilling gas extraction efficiency, reduce drilling engineering quantity, can also effectively improve gas drainage effect in soft and strong outburst coal seams Control the amount of coal output and gas emission during the hydraulic punching process.

Description

technical field [0001] The invention relates to the technical field of pressure-relief and anti-reflection enhanced gas drainage through bed-through drilling in soft coal seams, and in particular to a controllable jet punching and pressure-relieving and anti-reflection device for soft and soft coal seams and a method thereof. Background technique [0002] Most mining areas in my country have the characteristics of complex geological conditions, soft coal seams, poor air permeability, and high gas pressure. The use of dense drilling through layers for gas pre-extraction has become the main means of gas control. The low efficiency of gas drainage and the large amount of drilling work restrict the safe and efficient mining of mines. Increasing the air permeability of coal seams has become the key to improving gas drainage. At present, the technologies that are more suitable for improving gas permeability in soft and low-permeability outburst coal seams mainly include hydraulic s...

AI Technical Summary

Problems solved by technology

[0002] Most mining areas in my country have the characteristics of complex geological conditions, soft coal seams, poor air permeability, and high gas pressure. The use of dense drilling through layers for gas pre-extraction has become the main means of gas control. Problems such as low gas drainage efficiency and large drilling workload restrict the safe and efficient mining of mines

Increasing the air permeability of coal seams has become the key to improving gas drainage. At present, the technologies that are more suitable for improving gas permeability in soft and low-permeability outburst coal seams mainly include hydraulic slotting, hydraulic punching, and integrated drilling and cutting. The amount of coal and gas gushing out is uncontrollable, and cinders block the holes, which may easily cause gas overrun and scrapped drilling, and even cause outburst accidents

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