Working face goaf fissure zone drilling permeability segmented test device and test method

Abstract

The invention belongs to the field of gas treatment in goafs of mines, and particularly relates to a working face goaf fissure zone drilling permeability segmented test device and a test method. Including plugging water injection device. The working face goaf fissure zone drilling permeability segmented test device includes a blocking-off water injecting device, a water pump is connected to a hosewith scales, the hose with the scales is connected to the blocking-off water injecting device, the blocking-off water injecting device includes a No.2 bag, a No.2 slider, a water injecting hard pipe,a water injecting power head water injecting pipe, a No.1 slider, a No.1 bag and a water injecting power head, the water injecting power head water injecting pipe is arranged inside the water injecting hard pipe, the water injecting power head is arranged at the front end of the water injecting power head water injecting pipe, and the No.2 slider and the No.1 slider are fixed to the outer part ofthe water injecting power head water injecting pipe; and a valve A and a valve C are arranged at the positions, corresponding to the No.2 slider and the No.1 slider, of the water injecting hard pipe,the No.2 bag is arranged on the outer side of the valve A, the No.1 bag is arranged on the outer side of a valve B, the No.2 slider and the No.1 slider block off the valve A and the valve C correspondingly, the valve B is arranged between the valve A and the valve C of the water injecting hard pipe, and a spring and a limiting device are arranged in front of the 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 segmented testing device and a testing method for gas permeability of boreholes in fissures in goafs of working faces. Background technique [0002] Gas drainage is the most important means to solve the gas problem in the coal mining face. The gas drainage in the fissure zone above the goaf (adjacent layer gas) is drained due to the well-developed fissures, good air permeability and large drainage volume. Become the first choice for gas drainage in working faces. Therefore, the determination of the air permeability of the fractured zone becomes the key to the positioning of the drilling or high-pumping roadway. At present, there is no special device for measuring the air permeability of the fissure zone in the goaf, and the setting of the drainage boreholes and high-level drainage roadways in the fissure zone is more designed based on experience, so t...

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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