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Track varying drilling method and device

A drilling device and trajectory technology, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., can solve the problems of incomplete gas drainage and single drilling form, so as to improve the gas drainage effect and increase the gas consumption. The effect of extraction volume

Inactive Publication Date: 2017-05-10
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the single drilling form in the existing field of gas drainage in coal mines, resulting in incomplete gas drainage, and provides a variable trajectory drilling method and device, which can form branch holes by changing the trajectory of the drilling tool, thereby improving gas Drain effect

Method used

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  • Track varying drilling method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: A drilling method with variable trajectory, comprising the following steps: the first step is to drill a 100m deep hole with a diameter of 113mm into the coal seam with a drilling tool, and take out the drilling tool to form a main borehole 10 . The second step is to insert a track-changing drill pipe 1 with a diameter of 89 mm into the main borehole 10. An inclined side port 3 is arranged in front of the track-changing drill pipe 1. The centerline of the inclined side port 3 is aligned with the track-changing drill pipe 1 There is an included angle α on the axis line of , and the included angle α is 45°. In the third step, a bendable anchor cable drill 7 is set inside the track-changing drill pipe 1, and the front end of the anchor cable drill 7 is provided with a drill bit that can swing and can change the drilling trajectory along the inclined guide mechanism; Four steps, according to the different depths of the track-changing drill pipe 1 going deep in...

Embodiment 2

[0021] Embodiment 2: A trajectory-changing drilling device, referring to Fig. 1 and Fig. 2, comprising a trajectory-changing drill pipe 1 and an anchor cable drill 7, an inclined guide mechanism is arranged in front of the orbit-changing drill pipe 1, and the anchor cable drill 7 Set in the track changing drill pipe 1. The drilling rod of the anchor cable drill 7 is that there are many sections of short drill rods connected together by universal joints. The drill rod of the anchor cable drill 7 is provided with a drill bit that can swing, and the drill bit that can swing can change the drill bit along the inclined guide mechanism. into the track.

[0022] The inclined guide mechanism is provided with an inclined side port 3 on the front end side of the track changing drill pipe 1 , and there is an angle α between the center line of the inclined side port 3 and the axis line of the track changing drill pipe 1 . The included angle α ranges from 25° to 60°.

Embodiment 3

[0023] Embodiment 3: On the basis of Embodiment 2, the drilling rod of the cable anchor drill 7 is formed by a rigid hose.

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Abstract

The invention discloses a track varying drilling method and device. Firstly drilling is conducted on a coal bed, then a track varying drilling pipe is inserted into a main drill hole, the front part of the track varying drilling pipe is provided with a tilting guide mechanism, an anchor cable drill of which a drill rod is capable of crooking is arranged in the track varying drilling pipe in a sleeved mode, and tilting drilling is conducted on the side wall of the main drill hole according to the various depths degree to which the track varying drilling pipe penetrates into the main drill hole.On the basis of the main drill hole and through reasonable redrilling by using a track varying drilling device, a drill hole area in which the main drill hole is regarded as a center, and a lateral drill hole is regarded as the radius is finally formed, in this way, a coal body can be loosened, the gas can be extracted, thus the extraction quantity of the gas in the drill hole is increased, and the gas extraction effect in the coal bed can be improved.

Description

technical field [0001] The invention belongs to an improved drilling tool in the technical field of coal mine gas drainage, and in particular relates to a method and a device for forming branch boreholes by changing the trajectory of the drilling tool. Background technique [0002] The gas content of some coal seams is high, and the air permeability of the coal seams is poor, which brings difficulties to the gas prevention and control work, and there is a danger of coal and gas outburst, which endangers the safety of miners. Gas pre-extraction is an important measure for gas control, but the soft coal seam has poor air permeability and the effect of pre-extraction is poor. At present, in my country, the outer hole diameter of outburst coal seam drilling is required to be no more than 120mm, and the inside of the hole can be reamed. In case of outstanding events, the coal wall plays a protective role. [0003] There are many technical means about reaming, for example, the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04E21B7/06E21D20/00
CPCE21B7/04E21B7/061E21D20/003
Inventor 李辉魏建平
Owner HENAN POLYTECHNIC UNIV
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