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Drilling device with gas extraction hole radius adjustable while drilling and working method thereof

A gas extraction and drilling device technology, applied in drilling equipment and methods, drill bits, drill pipes, etc., can solve the problems of misjudgment of extraction effect, blind area of ​​drilling and extraction, long extraction time, etc. Gas content and the effect of eliminating blind spots in drainage

Pending Publication Date: 2019-08-27
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of mining activities and the effect of geological structure, the distribution of permeability in different regions of the coal seam is different.
Especially for bedding drilling, due to the influence of the roadway layout, as the distance from the orifice increases, the stress distribution of the coal seam has successively experienced the pressure relief area, the stress concentration area, and the original rock stress area from the outside to the inside, resulting in the original distribution Uneven permeability, becoming more uneven
[0005] For this reason, using the existing conventional gas drilling technology to perform drainage under the same aperture may result in areas with different depths inside the borehole and different drainage efficiencies. Insufficiencies such as misjudgment of long-term drainage and extraction effect pose a great threat to the safety and high-efficiency production of coal mines

Method used

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  • Drilling device with gas extraction hole radius adjustable while drilling and working method thereof
  • Drilling device with gas extraction hole radius adjustable while drilling and working method thereof
  • Drilling device with gas extraction hole radius adjustable while drilling and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1, a gas drainage hole radius adjustable drilling device, such as Figure 1-4 , including a drill bit 1 and a drill pipe 2 connected together, one end of the drill bit 1 is provided with annular uniformly distributed drill teeth 1-1, the other end is a threaded connecting pipe 1-2, the middle part of the drill bit 1 is a cone and the surface is provided with Including radial teeth, the drill pipe 2 is a hollow pipe structure, the center of the drill bit 1 is provided with a water outlet hole 1-3 communicating with the drill pipe 2, one end of the drill pipe 2 is provided with internal thread I2-4, and the other end is provided with a threaded nozzle Ⅰ2-3, the threaded connecting pipe 1-2 cooperates with the internal thread Ⅰ2-4 of the drill pipe 2, and the surface of the drill pipe 2 is provided with at least one set of ring-shaped and concave bracket grooves 2-1, and the bracket grooves 2- 1 is placed with a bracket body, the notch of the bracket groove 2-1 ...

Embodiment 2

[0054] Embodiment two is basically the same as embodiment one, the difference is: as Figure 1-9 , there are three sets of bracket grooves 2-1 on the surface of the drill pipe 2, and the three groups of bracket grooves 2-1 are arranged in sequence from left to right, and the first bracket body 3, the second bracket body 4, and the first bracket body 4 are placed in sequence. Three brackets 5, the bracket baffle below the first bracket 3 is turned outwards and is the first bracket 3-1, the first bracket 3-1 and its corresponding notch baffle 2-2 cooperation; the bracket baffle below the second bracket 4 is turned inward and is the second bracket baffle 4-1, and the tubular structure of the second bracket 4 is provided with a The primary extension tube 8, the top of the primary extension tube 8 is provided with a first extension baffle 8-1 that is turned outward, and the bottom is provided with a second extension baffle 8-2 that is turned outward, and the first extension The ba...

Embodiment 3

[0056] Embodiment three is basically the same as embodiment two, the difference is: as Figure 10 and 11 , the gas injection pipe 6 includes a base pipe 6-2 and an extension pipe 6-3, one end of the base pipe 6-2 is closed, the other end is open and provided with internal thread II 6-8, both ends of the extension pipe 6-3 are open and one end It is threaded pipe port Ⅱ6-9, and the other end is internal thread Ⅱ6-8. The internal thread Ⅱ6-8 of the base pipe 6-2 is matched with the threaded pipe port Ⅱ6-9. There are multiple extension pipes 6-3, and every two phases The adjacent extension pipe 6-3 is connected through the threaded nozzle II 6-9 and the internal thread II 6-8, the base pipe 6-2 and the extension pipe 6-3 are equipped with a self-sealing gas injection system, and the self-sealing gas injection system includes a The filling and deflation valve 6-7, the sealing structure positioned at the rear, the sealing structure includes a plugging ball 6-4 positioned at the ce...

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Abstract

The invention relates to a drilling device with the gas extraction hole radius adjustable while drilling and a working method of the drilling device. The drilling device comprises a drill bit and a drill rod, wherein the drill bit and the drill rod are connected together. At least one group of radius enlarging grooves are formed in the surface of the drill rod. Radius enlarging bodies are arrangedin the radius enlarging grooves. Telescopic bodies positioned in tubular structures are fixedly connected below the radius enlarging bodies and are fixed to the bottoms of the radius enlarging grooves. Gas injection pipes positioned in the centers are arranged in rod bodies of the telescopic bodies. The lateral sides of the gas injection pipes are connected with annularly and uniformly distributed branch pipes connected to the bottoms of the radius enlarging grooves. The radius enlarging bodies are arranged in the radius enlarging grooves of the drilling device and can inject gas into the telescopic bodies in the radius enlarging grooves through the gas injection pipes to enable the radius enlarging bodies to extend out, so that the drilling radius can be enlarged. When the gas in the telescopic bodies is discharged, the radius enlarging bodies can return back into the radius enlarging grooves under the action of external pressure and restoring force of the telescopic bodies. By meansof the working method, gas in an extraction drilled hole can be extracted uniformly, extraction blind areas can be eliminated, and the gas content in an extraction area can be comprehensively reduced.

Description

technical field [0001] The invention relates to the technical field of coal seam gas drainage drilling, in particular to a gas drainage hole radius adjustable drilling device and a working method thereof. Background technique [0002] With the increase of coal mining depth, the in-situ stress and gas content of coal seams increase, leading to a greater potential risk of coal and gas outbursts, and the control of coal seam gas must be strengthened. Especially as the country's requirements for safe production increase, it becomes more urgent to strengthen gas control. [0003] At present, there are many methods of gas control, which mainly include ground gas drainage and underground gas drainage. Among them, the underground gas drainage method has become the most widely used gas control method due to its advantages of perfect drainage theory, mature drainage technology and good drainage effect. This method is mainly to drill holes in the coal seam. By reducing the pressure o...

Claims

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Application Information

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IPC IPC(8): E21B7/28E21B17/042E21B10/26E21B10/60E21B17/00
CPCE21B7/28E21B10/26E21B10/60E21B17/00E21B17/042
Inventor 贾炳万祥云孙兰会彭荣富田好敏王文军黄战峰杨豪
Owner HENAN UNIV OF URBAN CONSTR
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