Four-period-five-purpose hole-drilling high-efficiency gas extracting process

Abstract

The invention discloses a four-period-five-purpose hole-drilling high-efficiency gas extracting process, comprising the steps of: drilling a measure hole from a rock stratum tunnel wall of a coal seam top plate rock stratum tunnel to one side of the rock stratum tunnel and drilling a extracting hole from the rock stratum tunnel wall of the coal seam base plate rock stratum tunnel to a coal seam working face; performing shock blasting and/or hydrofracture to the measure hole for increasing the permeability of the coal seam, wherein the measure hole is a rock hole in the top plate or base plate rock stratum of the coal seam and positioned over or under the coal seam working face; sealing the measure hole and the extracting hole for extracting gas, and then tunneling the tunnel of the coal seam; continuously extracting the gas in the coal seam through the measure hole and/or the extracting hole when before and in stope. According to the four-period-five-purpose hole-drilling high-efficiency gas extracting process, the high-efficiency gas extraction in periods of tunneling the coal seam tunnel, and before, in and after stoping on the working face can be achieved. And simultaneously, the four-period-five-purpose hole-drilling high-efficiency gas extracting process can shield the tunneling of double coal seam tunnel of the working face.

Description

technical field [0001] The invention relates to an underground gas drainage technology in a coal mine. Background technique [0002] Coal seam gas is a kind of clean energy, but it is also a source of disaster for coal mine production. How to achieve gas drainage before excavation, before mining, during mining, and after mining (goaf), to achieve the dual purposes of resource development and utilization and coal mine disaster reduction, has always been the focus of attention. [0003] Before coal mining in our country, we must first realize the pre-pumping of the coal seam area. After the pre-pumping reaches the standard, technologies such as pre-pumping before digging and pumping while digging are generally used to cover the tunneling of coal seam roadways. However, most mines in my country are In coal and gas outburst mines, there are difficulties in drilling construction, and phenomena such as jacking, sticking, and injection holes are prone to occur, which seriously rest...

AI Technical Summary

Problems solved by technology

In this way, the waste of the rock formation roadway and the drilling holes for cross-bed drainage is caused, and even in some soft coal seams, it is difficult to construct through-bed drilling, and it is impossible to talk about gas control.

[0005] For mines with high gas outbursts, rock formation roadways are often constructed on the upper part of the pre-excavation roadway, and a large number of through-bed drilling holes are constructed in the rock formation roadway to the coal seam for drainage. Working face recovery speed

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