Fixed-point monitoring and maintenance device and method for gas extraction drilling hole stability

Abstract

The invention discloses a fixed-point monitoring and maintenance device and method for gas extraction drilling hole stability. The fixed-point monitoring and maintenance device comprises a drilling hole deformation monitoring system, a fixed-point supporting system, an end part fixing device and a supporting power applying device, wherein the drilling hole deformation monitoring system has a bearing sieve pipe, a strain sheet, a lead, a stress strain monitor; the strain sheet is tightly applied to the inner wall of the bearing sieve pipe and connected with the stress strain monitor via the lead; the fixed-point supporting system has a transmission rod, a supporting shaft, supporting rods and supporting contact plates; the supporting contact plates are hinged with the transmission rod and the supporting shaft via the supporting rods; the end part fixing device is fixed on a drilling hole port coal wall; the transmission rod passes through a center of the end part fixing device; the supporting power applying device has a scale, a pointer and a rocking handle; and the rocking handle enables the transmission rod to rotate, so supporting power can be provided. Deformation quantity of different positions of a drilling hole can be monitored by the drilling hole deformation monitoring system, and then fixed-point support and protect can be provided to a position having great deformation quantity, so hole collapse can be effectively prevented and gas extraction rate can be improved.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage drilling equipment, in particular to a device and method for fixed-point monitoring of gas drainage drilling stability, directional maintenance and anti-collapse holes. Background technique [0002] my country is rich in coal resources, but coal seams generally have the characteristics of "three highs and one low". During the coal mining process, the problems of gas exceeding the limit and gas outburst are particularly obvious, which seriously affect the safe and efficient production of mines. At present, the technical measure that can effectively solve the mine gas problem is to carry out gas drainage on high-gas coal seams. During the gas drainage of this coal seam, it is necessary to drill multiple sets of drill holes into the coal seam. If drilling is used for protection, the phenomenon of hole collapse will often occur, causing the drilling to fail, which is time-consuming and ...

AI Technical Summary

Problems solved by technology

[0002] my country is rich in coal resources, but the coal seam generally has the characteristics of "three highs and one low". During the coal mining process, the problem of gas exceeding the limit and gas outburst is particularly obvious, which seriously affects the safety and efficient production of mines.

At present, the technical measure that can effectively solve the mine gas problem is to carry out gas drainage on high-gas coal seams. During the gas drainage of this coal seam, it is necessary to drill multiple sets of drill holes into the coal seam. Drilling for protection will often cause hole collapse, resulting in failure of the drilling, time-consuming and labor-intensive

At present, most of the borehole construction technologies in engineering do not have any monitoring and maintenance measures for borehole stability. After the gas drainage borehole is drilled, the borehole is subject to strong ground stress and frequent dynamic disturbances, and local collapse of the borehole is prone to occur.

In terms of technical equipment to prevent borehole collapse, the usual measure is to add a sleeve to the entire borehole, and support the hole wall through the sleeve. This support method cannot accurately locate the position where the borehole is prone to collapse. Realize precise and fixed-point support for drilling, and the sleeve cannot be recycled, wasting materials

Images