A device and method for multi-stage pressure-sealed pressure measurement of ultra-long soft coal seam drilling

Abstract

The invention discloses a multi-stage pressurized sealing pressure measuring device and method for drilling holes in an ultra-long soft coal seam. It includes the body of the pressure measuring device; the pressure measuring device includes a galvanized pipe, a gas pipeline, a grouting pump and a pressure gauge; the top of the galvanized pipe is provided with an air inlet head; the body of the galvanized pipe is provided with a plurality of expansion capsules at intervals, Openings are provided on the body of the galvanized pipe in the first section of the expansion capsule at the front end of the galvanized pipe; on the body of the galvanized pipe in the remaining expansion capsules and the body of the galvanized pipe between the expansion capsules Blast valves are installed on both sides; the back end of the galvanized pipe is connected to the grouting pump; the gas pipeline is installed inside the galvanized pipe, and the pressure gauge is connected to one end of the gas pipeline at the back end of the galvanized pipe. The invention does not need to exit the drill pipe and send it into the pressure measuring device, which avoids the problem that the pressure measuring device cannot be delivered in place; at the same time, the multi-stage grouting seal solves the problem that the drill hole is too long, the grouting is not in place, and the penetration radius of the grouting pressure Too small a problem.

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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