A coal mine gas measurement borehole water outlet detection and hole sealing drainage device

Abstract

The invention discloses a water outlet detecting and sealing hole water discharging device for a coal mine gas measuring drilling hole. The device comprises a drilling hole, a first capsule, a grouting pipe, a second capsule, a water discharging pipe, a gas pipe and a water stopping expansion rubber sleeve. The first capsule and the second capsule are arranged in the drilling hole. The drilling hole is communicated with a pressure detecting chamber. The drilling hole between the first capsule and the second capsule is set to a grouting plugging chamber. The first capsule and the second capsuleare connected with a mucus pipe. According to the device of the invention, the drilling hole is preliminarily plugged through the first capsule and the second capsule; then secondary plugging is performed on the drilling hole through grouting of the grouting pipe, thereby realizing high plugging effect of the drilling hole; furthermore the water stopping expansion rubber sleeve expands at the presence of water, thereby preventing water seepage and realizing higher tightness between the first capsule, the second capsule and the inner wall of the drilling hole. A water discharging valve on thewater discharging pipe is slowly opened, thereby detecting an actual value of a gas pressure in the pressure detecting chamber. The water in the pressure detecting chamber is discharged and a large amount of water accumulated in the pressure detecting chamber can be discharged in time, thereby improving gas pressure detecting accuracy.

Description

technical field [0001] The invention relates to the technical field of coal mine gas safety, more specifically, it relates to a water discharge detection and hole sealing drainage device of a coal mine gas measurement borehole. Background technique [0002] Underground coal mine hydrogeological conditions are complex, and water prevention and control projects require a large number of water exploration and grouting drillings. During the drilling process, the water output of multiple layers varies. Accurately judge the water level and timely and accurately observe the water output. [0003] In addition, during the preliminary exploration process of coal mines, a large number of boreholes were poorly sealed or not closed, which caused a major hidden danger to the safe mining of coal mines. Due to the difficulty of detection, many coal mines were exposed during roadway excavation or working face mining, resulting in water gushes The incident caused heavy losses to the safe min...

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Problems solved by technology

[0002] Underground coal mine hydrogeological conditions are complex, and water prevention and control projects require a large number of water exploration and grouting drillings. During the drilling process, the water output of multiple layers varies. Accurately judge the water level and timely and accurately observe the water output

[0003] In addition, during the preliminary exploration process of coal mines, a large number of boreholes were poorly sealed or not closed, which caused a major hidden danger to the safe mining of coal mines. Due to the difficulty of detection, many coal mines were exposed during roadway excavation or working face mining, resulting in water gushes The incident caused heavy losses to the safe mining of coal mines

[0004] Existing water flow observations mostly use the volumetric method for water flow observation, but the speed is slow and cannot meet the requirements of rapid drilling construction. During the drilling construction process, the water flow is mostly estimated by experience. Due to human subjective factors and personal actual experience Therefore, there is a certain error in estimating the water output of the borehole, and even the position of the water outlet cannot be judged in time; the existing water output measurement function is single, and the gas pressure in the borehole cannot be measured, and the measurement of the gas pressure needs to be re-measured, which is time-consuming and laborious.

[0005] In addition, for unsatisfactory drilling, the ground is mainly unsealed in advance. Once a water inrush accident occurs, there are not many ways to deal with the downhole drilling; due to long-term use, the water quality contains more sulfur and the environment is tidal, and the sealing place of the drilling is easy to crack and cause water inrush. , how to successfully block water is a big problem

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