Multi-stage under-pressure sealing pressure measuring device and method for ultra-long spongy coal seam drilling

Abstract

The invention discloses a multi-stage under-pressure sealing pressure measuring device and method for ultra-long spongy coal seam drilling. The device comprises a pressure measuring device body including a galvanized pipe, a gas pipeline, a grouting pump and a pressure gauge. An inlet head is arranged at the top of the galvanized pipe; a plurality of expansion capsules are arranged at the body ofthe galvanized pipe at intervals; d an opening is formed in the body of the galvanized pipe in the first expansion capsule at the front end of the galvanized pipe; and explosion valves are arranged atthe body of the galvanized pipe in the rest of expansion capsules and the body of the galvanized pipe among the expansion capsules. Besides, the grouting pump is connected to the pipe orifice at therear end of the galvanized pipe. The gas line is arranged inside the galvanized pipe; and the pressure gauge is connected to one end of the gas pipeline at the pipe orifice of the rear end of the galvanized pipe. A phenomenon that the pressure measuring device is fed after a drilling rod is retracted is avoided and a problem that the pressure measuring device does not arrive at a correct place issolved. On the basis of multi-stage grouting sealing, problems of too long drilling hole, inaccurate grouting, and too small grouting pressure penetration radius are solved.

Description

technical field [0001] The invention relates to a multi-stage belt pressure sealing pressure measuring device and method for super-long soft coal seam drilling, belonging to the field of coal mine safety. Background technique [0002] Coal seam gas pressure is one of the most basic coal seam parameters, how to quickly and accurately measure coal seam gas pressure is an urgent technical problem to be solved. Ordinary coal and rock drilling is sealed by "two blocks and one injection" pressure grouting or viscose injection, which can basically achieve a better sealing effect and measure the real gas pressure of the coal seam; , if the drill pipe is pulled out and then sent to the pressure measuring device, the pressure measuring device will not be delivered properly due to reasons such as borehole collapse, bending, and too deep, so that it is impossible to measure the coal seam gas pressure. Contents of the invention [0003] The purpose of the present invention is to provi...

AI Technical Summary

Problems solved by technology

Ordinary coal and rock drilling is sealed by "two blocks and one injection" pressure grouting or viscose injection, which can basically achieve a better sealing effect and measure the real gas pressure of the coal seam; , if the drill pipe is pulled out and then sent to the pressure measuring device, the pressure measuring device will not be delivered properly due to reasons such as borehole collapse, bending, and too deep, so that it is impossible to measure the coal seam gas pressure

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