A segmented test device and test method for the air permeability of boreholes in the fissure zone of the goaf in the working face

Abstract

The invention belongs to the field of gas treatment in goafs of mines, and in particular relates to a segmented testing device and a testing method for gas permeability of boreholes in fissures in goafs of working faces. Including the plugging water injection device, the water pump is connected with the hose with scale, the hose with scale is connected with the plugging water injection device, the plugging water injection device includes No. 2 bag, No. 2 slider, water injection hard pipe, water spray power Head water injection pipe, No. 1 slider, No. 1 bag and water spray power head. The water injection pipe of the water spray power head is set inside the water injection hard pipe. The No. 2 slider and the No. 1 slider are fixed on the outside, and the position of the water injection hard pipe corresponding to the No. 2 slider and the No. 1 slider is provided with the A valve and the C valve. No. sac, No. 2 slider and No. 1 slider block A valve and C valve respectively, and a B valve is set between the water injection hard pipe A and C valves, and a spring and a stopper are set in front of No. 1 slider.

Description

technical field [0001] The invention belongs to the field of gas treatment in goafs of mines, and in particular relates to a subsection testing device and a testing method for the permeability of boreholes in fissure zones of goafs of working faces. Background technique [0002] Gas drainage is the most important method to solve the gas problem of coal mining working face. The drainage of pressure relief gas (gas adjacent layer) in the fissure zone above the goaf of the working face, due to the development of fissures, good permeability and large drainage volume, It has become the first choice for working face gas drainage. Therefore, the determination of the permeability of the fracture zone becomes the key to the positioning of the borehole or the high pumping roadway. At present, there is no special device for measuring the permeability of the fissure zone in the goaf. The setting of the drilling hole and the position of the high-drainage roadway in the fissure zone is m...

AI Technical Summary

Problems solved by technology

At present, the method used to measure rock permeability is to take out cores for testing, but it is very difficult to take cores downhole, and it is difficult to take out complete cores where fissures are developed, so the method of using cores to test rock permeability is not suitable. Applicable to the determination of air permeability in fractured zones

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