Underground gas injection leakage position detection device

Abstract

The utility model discloses an underground gas injection leakage position detection device which comprises an extraction pipe, an outer hole sealing capsule and an inner hole sealing capsule, the extraction pipe extends into an extraction drill hole, and a primary hole sealing section is arranged on the rear portion of the extraction drill hole; the extraction pipe extends into the extraction drill hole in front of the primary hole sealing section and is connected with the outer hole sealing capsule; a gas injection pipe and a water injection pipe are arranged in the extraction pipe; the water injection pipe is forwards connected with the inner and outer hole sealing capsules; the extraction drill hole between the inner hole sealing capsule and the outer hole sealing capsule forms a gas injection experiment section for detecting a gas leakage position; the water injection pipe backwards extends out of the extraction pipe and is connected with a manual hydraulic pump; the manual hydraulic pump is communicated with a water source; the inner hole sealing capsule, the outer hole sealing capsule and the gas injection pipe between the inner hole sealing capsule and the outer hole sealing capsule are provided with gas injection openings communicated with a gas injection experiment section of the extraction drill hole; and the gas injection pipe backwards extends out of the extraction pipe and is connected with a high-pressure gas source. The device is simple in structure, a section of extraction drill hole is conveniently plugged after water is filled through the inner hole sealing capsule and the outer hole sealing capsule, then a gas injection experiment is conducted on the extraction drill hole, finally the gas leakage position of the extraction drill hole is obtained, and an accurate basis is provided for secondary plugging of secondary cracks.

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