A drill pipe for directional expansion of coal seam crack scale and its application method

A drill pipe and coal seam technology, which is applied in the direction of drill pipe, drill pipe, drilling equipment, etc., can solve the problems of coal seam crack ductility uncontrollable, small crack size, uncontrollable direction, etc., to save manpower, increase depth, and improve production efficiency effect

Inactive Publication Date: 2016-08-17
LOGISTICS UNIV OF CAPF
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, a single drilling device is used to inject water into the coal seam to weaken the cracks. The cracks generated in the coal seam are small in scale and uncontrollable in direction, and the cracks cannot be expanded in the predetermined direction.
At present, the biggest problem of this technology is that the crack ductility of the cracked coal seam cannot be controlled, and the effect is poor.

Method used

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  • A drill pipe for directional expansion of coal seam crack scale and its application method
  • A drill pipe for directional expansion of coal seam crack scale and its application method
  • A drill pipe for directional expansion of coal seam crack scale and its application method

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0026] Such as figure 1 , figure 2 As shown, the present invention provides a drill pipe for directionally expanding the scale of coal seam cracks. The angle between them ranges from 0° to 90°. The handle 11 is inserted into the bottom of the outer sleeve through the iron ring 14, and the handle 11 is welded on the circumference of the iron ring 14. Generally, there are 1 or 2 handles 11. In actual production, according to the hardness of the coal seam, adjust the angle of the handle 11 to control the angle range of high-pressure water injection to the outer sleeve 1, thereby ensuring the water injection velocity and flow rate. A first water injection slit 12 is arranged on the bottom circumference of the outer casing 1, a water outlet hole 13 is arranged on the top of the outer casing, an inner casing 2 is arranged inside the outer casing, and a flow divider is a...

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Abstract

The invention discloses a drilling rod for directionally expanding the coal bed cracking scale and a using method thereof. The drilling rod comprises a hollow outer sleeve tube, a handle is arranged on the outer side of the bottom of the outer sleeve tube, and a first water injecting seam is formed in the bottom circumference of the outer sleeve tube. A water outlet hole is formed in the top of the outer sleeve tube, an inner sleeve tube is arranged in the outer sleeve tube, and a flow splitter is arranged on the top of the inner sleeve tube. A second water injecting seam is formed in the bottom circumference of the inner sleeve tube, and a valve is arranged between the first water injecting seam and the second water injecting seam. Through the drilling rod and the using method thereof, cracks generated by cracked coal beds extend in a preset direction on a large scale, the gas permeability of the coal beds is improved, the strength of the coal beds is lowered, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a mining method in the coal mine industry, in particular to a drill pipe for directionally enlarging the scale of coal seam cracks and a method for using the same. Background technique [0002] The coal mining industry is a supporting industry for economic development. How to mine coal mines efficiently, safely and environmentally friendly is a technical issue that is constantly being studied. Considering the strong hardness and high density of coal seam rock mass, the use of hydraulic fracturing technology in the mining process can reduce the strength of coal seam rock mass and enhance the gas permeability of coal seam. In the prior art, a single drilling device is used to inject water into the coal seam to weaken the cracks. The cracks generated in the coal seam are small in scale and uncontrollable in direction, and the cracks cannot be expanded in a predetermined direction. At present, the biggest problem of this technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B17/00
Inventor 王有熙
Owner LOGISTICS UNIV OF CAPF
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