A construction technique involving the raising method of a gas shaft passing through a strong water-rich rock formation
It is a construction technology and vertical well technology, which is applied in the direction of gas discharge, wellbore/well components, drilling equipment, etc., and can solve the problems of shortening the construction period and cost of gas riser installation and construction, large water gushing plugging, pressure difference inside and outside the pipe, etc. Achieve the effect of solving the problem of pressure difference inside and outside the pipe, shortening the construction period and cost, and broadening the application range
Active Publication Date: 2018-02-27
BEIJING CHINA COAL MINE ENG CO LTD +1
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Problems solved by technology
[0004] In view of this, the present invention is to provide a construction process related to the raising method of the gas shaft passing through the strong water-rich rock formation, which solves the problem of large water gushing plugging, the problem of pressure difference between the inside and outside of the pipe during filling, and the problem of filling compactness, and greatly shortens the gas vertical well. reduce the construction period and cost of pipe installation and construction, and further broaden the application range of raise drilling rigs
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[0042] In order to clearly illustrate the solutions of the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.
[0043] In this embodiment, the gas drainage shaft of Shihao Mine of Chongqing Songzao Coal and Electricity Company is taken as an example. The construction process of the gas drainage shaft includes the following steps:
[0044] (1) Gas shaft excavation.
[0045]In this embodiment, the gas shaft 14 is constructed by raising the drilling rig, and the pilot hole is reamed into a gas shaft 14 with a diameter of 1.65m. It is 20m3 / h, and the hole bottom deviation is 0.54%. . During the pilot hole drilling process, the drilling rig transmits the thrust and torque to the power head through the main thrust cylinder and the motor, and the power head transmits the thrust and torque to the pilot hole drill bit through the drill rod, and the hob on the pilot hole drill bit is cut by rollin...
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The invention discloses a construction process involving a gas vertical well passing through a strong water-rich rock formation, which comprises the following steps: (1) excavating the gas vertical shaft; (2) lowering the gas pipe; The bottom end of the annular space between the well wall and the gas pipe wall is sealed; (4) The gas shaft is filled afterward. The present invention solves the problem of large water gushing plugging, pressure difference inside and outside the pipe, and filling compactness by studying the lower port annulus plugging method and innovating the filling process, greatly shortening the construction period and cost of gas pipe installation and construction, and at the same time It also further broadens the application range of the raise drilling rig.
Description
technical field [0001] The invention relates to the field of mining machinery, in particular to a construction process involving a reverse well method for a gas shaft passing through a strong water-rich rock formation. Background technique [0002] In response to the safety requirements of the National Coal Safety Supervision Bureau, high-gas mines must be pumped before mining. After the coal mine gas is collected from the coal seam, it is pumped to the ground by a large-diameter gas riser (the inner diameter of the pipe is about 1m), and then the gas is treated and applied. Among them, the installation of the gas riser and the filling behind the wall become the key projects. [0003] At present, there are two methods for the installation and construction of gas risers, one is the raising drilling rig sinking method, and the other is the front shaft method. The disadvantage of the front shaft method is that the construction period is more than twice that of the raise drilli...
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IPC IPC(8): E21B7/00E21B33/12E21B33/13E21F7/00
Inventor 汪船程守业黄德辉荆国业李英全姜浩亮
Owner BEIJING CHINA COAL MINE ENG CO LTD