Monitoring equipment for gas extraction negative pressure, extraction concentration and other indexes of directional long drill hole

Abstract

The invention relates to the technical field of gas extraction negative pressure monitoring equipment, and concretely relates to monitoring equipment for gas extraction negative pressure, extraction concentration and other indexes of a directional long drill hole. The monitoring equipment comprises a first limiting structure, a sealing structure, a driving structure, a monitoring structure, a second limiting structure and an angle adjusting structure. The first limiting structure used for limiting is arranged on the monitoring structure used for monitoring the gas extraction negative pressure,extraction concentration and other indexes of the directional long drill hole, the sealing structure used for sealing is arranged on the first limiting structure, and the monitoring structure is arranged in the sealing structure. The sealing structure is provided with the driving structure used for driving, so that the sealing structure is driven by the driving structure to expand to abut againstthe long drill hole, the sealing performance between the sealing structure and the long drill hole is better, the driving structure drives the first limiting structure to firmly abut against the sidewall of the long drill hole, and connection of the monitoring structure in the first limiting structure is firmer.

Description

technical field [0001] The invention relates to the technical field of monitoring equipment for gas drainage negative pressure, in particular to monitoring equipment for indicators such as gas drainage negative pressure and drainage concentration of directional long boreholes. Background technique [0002] With the increase of mining depth, the gas content and gas pressure also increase, and the risk of coal seam outburst is increasing. The gas problem has become the main factor restricting the efficient and safe production of coal mines. When mining outburst coal seams, regional outburst prevention measures mainly include mining protective layers and pre-pumping coal seam gas. When some mines do not meet the conditions for mining protective layers, pre-pumping coal seam gas must be used as regional outburst prevention measures; pre-pumping coal seam gas Under normal circumstances, we choose to arrange bed-by-bed or cross-bed boreholes for gas drainage; gas drainage is not o...

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Problems solved by technology

[0003] However, at present, most of the domestic and foreign scholars’ research results on the theory of mine gas drainage are aimed at shallow boreholes of tens of meters, without considering the influence of viscous mechanics of gas flowing in boreholes. increase, the problem of pressure drop cannot be ignored, and there will be a lack of theoretical guidance in the design of gas drainage, and there is a certain degree of blindness; The dynamic change characteristics along the borehole length, the determination of reasonable gas drainage parameters, and the matching between long boreholes and drainage negative pressure have become one of the main problems in improving the gas drainage effect. For the monitoring of boreholes and ordinary drainage boreholes, only one observation hole is set at the mouth of the hole, and various instruments are manually used to detect various parameters, and the operation is complicated; due to the short distance of ordinary boreholes, the negative pressure loss is small, and the negative The pressure also meets the requirements of drainage, but the negative pressure loss of the directional long drilling is large due to the long distance, and there may be no negative pressure or even positive pressure at the bottom of the hole, which affects the drainage effect and leads to the construction of too long drilling Drainage is meaningless, and it is not convenient to quickly seal and connect the end of the coal mine borehole, and the monitoring angle is not convenient for quick adjustment

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