Device and method for drilling and forming hole in coal rock in structural belt

A technology of hole-forming device and structural belt, which is applied in the direction of drilling equipment and methods, safety devices, drill bits, etc., to achieve the effects of increasing hole-forming rate, improving safety, and life safety and reliability

Inactive Publication Date: 2011-11-02
HENAN POLYTECHNIC UNIV
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  • Application Information

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Problems solved by technology

At present, there is no device suitable for coal...

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  • Device and method for drilling and forming hole in coal rock in structural belt
  • Device and method for drilling and forming hole in coal rock in structural belt
  • Device and method for drilling and forming hole in coal rock in structural belt

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Embodiment Construction

[0041] The direction in this embodiment takes the drilling direction as the forward direction, that is, the outer drill bit is located at the front end of the coal and rock drilling device in the structural belt. figure 1 Middle mark 33 is the threaded joint between each part.

[0042] Such as Figure 1 to Figure 7 As shown, the coal rock drilling device in the structural zone of the present invention includes a power unit 1, a drill rod mechanism and a water injection mechanism.

[0043] Such as Figure 1 to Figure 7 As shown, the drill rod mechanism includes an outer drill rod, and the outer drill rod includes an outer wall 2 and an inner wall 3 that are sleeved together concentrically. The outer wall 2 includes more than two cylindrical outer wall sections that are connected together by screwing, Such as Figure 7 As shown, the outer wall 2 is cut with cracks 4 parallel to the axial direction of the drill pipe (of course, due to the needs of gas extraction, only the oute...

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Abstract

The invention discloses a device for drilling and forming a hole in coal rock in a structural belt. The device comprises a power device, a drilling rod mechanism and a water injection mechanism; the drilling rod mechanism comprises an external drilling rod; the external drilling rod comprises an external wall and an internal wall which are concentrically sleeved together; an external drilling rod cavity is formed between the external wall and the inner wall; a hollow internal drilling rod is concentrically sleeved in the inner wall; the external diameter of the inner drilling rod is smaller than the inner diameter of the inner wall so that an annular runner is formed between the internal drilling rod and the inner wall; the front end of the external drilling rod is provided with an annular external drilling head; the front end of the internal drilling rod is provided with a disc-shaped internal drilling head; the water injection mechanism comprises an internal drilling rod water injection device and an external drilling rod water injection device; and the power device is in transmission connection with the external drilling rod and the internal drilling rod by a transmission mechanism. By the device, the problems of easily-collapsed holes in the coal rock and difficulty in hole forming and gas drainage of a structural area can be solved, so that hole forming rate in the structural belt and around structural belt is improved, gas pre-drainage is effectively performed, and the safety of coal exploitation is further enhanced.

Description

technical field [0001] The invention relates to the technical field of coal bed methane development, in particular to the coal rock drilling technology in structural belts. Background technique [0002] Coal and gas outbursts have always been one of the main factors affecting the safety of coal mine production. This not only seriously restricts the rapid development of the coal industry, but most importantly, seriously threatens the life safety of coal miners. With the development of the economy and the improvement of people's living standards, the mining intensity of coal mines is continuously increasing, and the amount of gas gushing out during the mining process is also increasing, and the potential danger of existence is also increasing. Therefore, certain measures must be taken to reduce the gas in the mining area. Drilling holes for gas drainage is one of the important means to solve the gas outburst underground. [0003] Drilling and gas drainage is to drill a series...

Claims

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Application Information

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IPC IPC(8): E21B17/22E21B17/10E21B10/60E21B10/46E21B21/00E21B7/00E21F7/00
Inventor 倪小明贾炳吕闰生陈文学沈毅林然
Owner HENAN POLYTECHNIC UNIV
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