Soft coal seam controllable jet punching pressure relief antireflective device and method thereof

Abstract

The invention discloses a soft coal seam controllable jet punching pressure relief antireflective device and a method thereof. The device comprises a blowout prevention hole protective screen pipe, anend head protective cover, a hole sealing solid pipe, an orifice flange plate, a gas-slag-water separator, a high-pressure reverse rotation spray head, a high-pressure pipe and a high-pressure supplyassembly, wherein the orifice flange plate is arranged on an orifice, the hole sealing solid pipe and the blowout prevention hole protective screen pipe are arranged on the hole wall, the end head protective cover is arranged on the hole bottom, the high-pressure pipe extends into the hole from the orifice flange plate, the high-pressure reverse rotation spray head is arranged at the tail end ofthe high-pressure pipe, the rear end of the high-pressure pipe is connected to the high-pressure supply assembly, and the orifice is provided with the gas-slag water separator. According to the device, raw materials are convenient to obtain, the operation is simple, the implementation process is safe and controllable, the drilling gas extraction efficiency can be improved, the drilling engineeringquantity is reduced, and the coal outlet quantity and the gas emission amount in the hydraulic punching process can be effectively controlled while the gas extraction effect of the soft and strong outburst coal seam is improved.

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...

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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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