Drilling interval variable-diameter spiral drill pipe for soft-hard composite coal seam

A soft-hard composite and helical drill pipe technology, which is applied in the direction of drill pipe, drill pipe, drilling equipment, etc., can solve the problems of low drilling efficiency, shallow drilling depth, frequent drilling accidents, etc.

Inactive Publication Date: 2014-12-17
王永龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention combines the problems existing in the use of the existing auger drill rods, and through the innovation of the cross-sectional shape of the drill rods, the slag discharge space and the migration characte

Method used

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  • Drilling interval variable-diameter spiral drill pipe for soft-hard composite coal seam
  • Drilling interval variable-diameter spiral drill pipe for soft-hard composite coal seam
  • Drilling interval variable-diameter spiral drill pipe for soft-hard composite coal seam

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Effect test

Embodiment 1

[0016] Embodiment one: if figure 1 , figure 2 As shown, the variable-diameter helical drill rod used for drilling intervals in soft and hard composite coal seams of the present invention includes a high helical blade 1, a low helical blade 2, and a drill pipe body 3, and the high helical blade 1 and the low helical blade 2 are fixed on the On the drill pipe body 3. The high helical blade 1 is designed in two ways: no air hole 4 or air hole 4 is provided. The height of the low helical blade 2 is lower than that of the high helical blade 1, and the height of the high helical blade 1 is 2 to 10 times that of the low helical blade 2. The drill pipe body 3 is composed of a female joint 7, an intermediate rod body 6, and a male joint 5. The female joint 7 and the male joint 5 are connected to both ends of the intermediate rod body 6. The female joint 7 and the male joint 5 are designed to be threaded or plugged in.

[0017] The following introduces the principle of embodiment on...

Embodiment 2

[0020] Embodiment two: if Figure 4 , Figure 5 As shown, the difference from Embodiment 1 is that the connection mode of the drill pipe joint is changed. The female joint 12 and the convex joint 11 are designed as a hexagonal structure, and a pin hole 13 is designed on one side, and the convex joint 11 is provided corresponding to the pin hole 13. groove 14.

Embodiment 3

[0021] Embodiment three: as Image 6 As shown, the difference from Embodiment 1 and Embodiment 2 is that the cross-sectional shape of the vent hole 4 on the high helical blade 1 is changed, and a larger area of ​​slag discharge channel is formed between the vent holes 4 of the high helical blade 1, which can The effect of pressure-assisted slag removal can be more fully exerted, and the drilling effect of spaced and variable-diameter auger drill pipes in soft-hard composite coal seams can be better utilized in areas with serious drilling deformation.

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Abstract

The invention discloses a drilling interval variable-diameter spiral drill pipe for a soft-hard composite coal seam. The drilling interval variable-diameter spiral drill pipe comprises a high spiral blade, a low spiral blade and a drill pipe body, wherein the high spiral blade is higher than the low spiral blade, and due to the different heights of the blades, the maximum outer diameter tangent line of the drill pipe axially forms a periodic high-low fluctuation state. According to the drilling interval variable-diameter spiral drill pipe disclosed by the invention, the migration of drilling cuttings is in a continuous fluctuation state and accumulation is not liable to cause by virtue of an interval high-low fluctuation-type deslagging space formed by the height different of the spiral blades, thus reducing the occurrence probability of accumulation blockage between conventional spiral drill pipe blades; meanwhile, air vents are formed in the high spiral blade to realize compressed air drilling, thus expanding the functions of the drill pipe. The drilling interval variable-diameter spiral drill pipe disclosed by the invention is novel in design; the characteristics of the deslagging space in a drill hole are changed, the deslagging efficiency is increased, and the problems of low drilling depth, low drilling efficiency, frequent drill hole accidents and the like of the conventional spiral drill pipe are overcome due to innovation for the section shape of the drill pipe; the drilling interval variable-diameter spiral drill pipe is especially suitable for the soft-hard composite coal seam with a firmness coefficient f of greater than 0.5 and not greater than 1.

Description

technical field [0001] The invention belongs to the technical field of coal seam drilling engineering under complex conditions in coal mines, and in particular relates to a variable-diameter helical drill rod for drilling intervals in soft-hard composite coal seams. Background technique [0002] Gas drainage is the premise to ensure the safe mining of gas mines and realize the comprehensive utilization of gas. Limited by the geological conditions of coal seams and the existing drilling construction technology, the drilling technology of coal seams with complex conditions is a recognized problem at home and abroad. Since the coal seam in many mining areas in my country is a typical soft-hard composite coal seam, compared with the soft and soft coal seam with low strength, although the stability of drilling has been improved, it is affected by factors such as ground stress, gas pressure, structural stress and drill pipe disturbance. , Local drilling is easy to form "drill hole...

Claims

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Application Information

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IPC IPC(8): E21B17/22
Inventor 王永龙
Owner 王永龙
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