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Drilling with casing method for gas extraction hole of soft broken coal seam

A coal seam gas and pipe drilling technology, which is applied to drilling equipment and methods, gas discharge, drilling equipment, etc., can solve the problems of difficult deep hole drilling and poor hole forming effect of gas extraction holes, and achieves the goal of construction method Science, improvement of working environment, effect of increasing drilling depth

Inactive Publication Date: 2014-04-16
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] In view of the above situation, in order to solve the defects of the prior art, the purpose of the present invention is to provide a method for drilling gas extraction holes in soft and broken coal seams with pipes, which can effectively solve the difficulties of deep hole drilling of gas drainage holes in soft and broken coal seams and The problem of poor hole forming effect

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  • Drilling with casing method for gas extraction hole of soft broken coal seam
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  • Drilling with casing method for gas extraction hole of soft broken coal seam

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Embodiment Construction

[0014] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] Depend on Figure 1-8 Given, the present invention utilizes the gas extraction hole and pipe drilling device of the soft broken coal seam to carry out according to the following steps:

[0016] The first step is to stabilize the drilling rig. The base of the drilling rig support 11 is anchored to the roadway floor with a short anchor rod 14. The guide rail 13 is installed on the support 11. The drilling rig motor 12 and the drilling rig slip 10 are installed on the guide rail 13. The casing propeller 9 Installed on the front end of the slipper 10 of the drilling rig, connected to the power supply of the drilling rig and the hydraulic oil pipe, the slag discharge hole 17 in the casing thruster 9 is connected to the sewage hose to the ditch or the water tank;

[0017] The second step is to install the drilling ...

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Abstract

The invention relates to a drilling with casing method for a gas extraction hole of a soft broken coal seam. The problems that a deep gas extraction hole in a soft broken coal seam is difficult to drill and the hole forming effect is poor can be effectively solved. According to the technical scheme for solving the problems, the method comprises the following steps: 1, stabilizing a drilling machine; 2, installing a drilling tool; 3, drilling; 4, carrying out drilling with casing operation; 5, connecting a long sleeve and a drill stem; 6, rinsing boring mud; 7, drilling the deep hole in circulation; and 8, retreating the drilling tool. The construction method disclosed by the invention is scientific and reasonable, the collapse of a hole wall is avoided, and meanwhile, a smooth slag discharge channel is provided for the boring mud at the bottom of the hole, so that not only are the drilling speed and the drilling depth of the gas hole improved, but also the target of protecting the hole is achieved, and the gas extraction efficiency is significantly improved. The method is simple and practical in operation, the operation environment is improved, and the drilling with casing method is an innovation of gas extraction methods of a soft broken coal seam.

Description

technical field [0001] The invention relates to the technical field of gas drainage in coal mines, in particular to a drilling method for gas drainage holes and pipes in soft and broken coal seams. Background technique [0002] For a long time, gas drainage in high-gas mines is the premise of safe and efficient production in coal mines, and is the key factor to realize the maximum economic benefits of mines. At present, gas drainage holes are generally drilled by using extensions of drill bits and drill pipes. After the holes are formed, drainage is carried out without any treatment on the boreholes. This hole-forming process is more suitable for medium-hard coal seams, but in soft and broken coal seams, it often shows: ①During the drilling process, the drilling stability is poor, the hole wall often collapses before drilling, and the hole-forming quality is poor; ②Due to The wall of the borehole collapses in a large area, the discharge channel of the drilling slag is block...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B7/00
Inventor 张辉刘少伟常建超师小勇郑伟李梦珍徐佑林
Owner HENAN POLYTECHNIC UNIV
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