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Drill pipe for pressure relief and hole protection in soft coal and rock drilling

A technology for soft coal rock and hole protection, applied in the direction of drill pipe, drill pipe, drilling equipment, etc.

Inactive Publication Date: 2018-08-17
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 conventional hole protection drilling tools, fully exerts the mechanical slagging principle of the spiral width, and combines the hole protection function with the structure innovation of the spiral width. Drilling and slag removal are integrated to provide a drill pipe for pressure relief and hole protection in soft coal rock drilling, which has good hole protection effect, high slag discharge efficiency, and is conducive to improving drilling depth and efficiency.

Method used

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  • Drill pipe for pressure relief and hole protection in soft coal and rock drilling
  • Drill pipe for pressure relief and hole protection in soft coal and rock drilling
  • Drill pipe for pressure relief and hole protection in soft coal and rock drilling

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment one: if Figure 1 ~ Figure 4 As shown, the drill pipe used for drilling pressure relief holes in soft coal rocks of the present invention includes a hole-protecting helical blade 1, a drainage-assisting helical blade 2, and a hollow drill pipe body 3. 2 is coaxial with the hollow drill rod body 3, and the row-aiding helical blade 1 and the hole-protecting helical blade 2 are fixed on the hollow drill rod body 3. The row-aiding helical blade 2 is arranged in the middle of the pitch of the hole-protecting helical blade 1 , and the row-aiding helical blade 2 is located at the lower part of the tip 8 of the hole-protecting helical blade 1 . The hole-protecting spiral blade is composed of a blade top 8 and a petiole 9, and the width of the blade top 8 is L 1 Greater than petiole 9 width L 2 , blade top 8 width L 1 Width L for petiole 9 2 2 to 10 times of that. The hole-protecting helical blade 1 and the petiole 9 are structurally designed in two ways without ...

Embodiment 2

[0030] Embodiment two: if Figure 7 , Figure 8 As shown, the difference from the first embodiment is that the structure of the hole-protecting helical blade 1 is kept wide on the outside and narrow on the inside, the thickness of the blade tip is reduced, and the slag discharge space 14 is increased. When drilling in areas with high ground stress, high gas pressure, and coal-rock firmness coefficient f≤0.5, the deformation of the borehole is large and the wall of the borehole is seriously damaged. Under this condition, refer to Figure 8 , so that the width of the blade top 8 and the petiole 9 is relatively large, thereby expanding the area of ​​the hole protection, and at the same time, the slag discharge hole 4 is set on the petiole 9 of the hole protection spiral blade 1, and the slag discharge is assisted by compressed air, and the hole protection spiral blade 1 A slag discharge channel is formed between the slag discharge holes 4, which can effectively alleviate the pro...

Embodiment 3

[0031] Embodiment three: as Figure 9 , Figure 10 As shown, the difference from Embodiment 1 is that the cross-sectional shape of the slag discharge hole 4 on the petiole 9 is changed, and a larger area of ​​slag discharge channel is formed between the slag discharge holes 4 of the hole-protecting spiral blade 1, which can more fully Give full play to the effect of pressure-assisted slag removal.

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PUM

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Abstract

The invention discloses a pressure-relief and hole-protection drill pipe for soft coal and rock drilling. The pressure-relief and hole-protection drill pipe comprises hole-protection spiral blades, discharge aiding spiral blades and a hollow drill pipe body, wherein the height of the discharge aiding spiral blades is smaller than the height of the hole-protection spiral blades; and the cross section of the hole-protection spiral blades is designed into a structure with the wider outer side and the narrow inner side. The hole-protection effect is achieved on the soft and weak coal and rock layer drill hole wall by a wide blade structure arranged at the outer side of the hole-protection spiral blades; the slag discharge passage blockage due to drill hole deformation is effectively avoided, and drilling chips are discharged under the protection of the hole-protection spiral blades; and the slag discharge capability of the drill pipe can be improved by the discharge aiding spiral blades, and the drill chip accumulation blockage is prevented from being formed under the hole-protection spiral blades. The pressure-relief and hole-protection drill pipe has the advantages that the design is novel; the hole-protection spiral blades have the hole-protection and slag-discharge duplex effects; meanwhile, a separated hole-protection space is formed between the hole-protection spiral blades; the pressure-relief effect is achieved; the contact area between the hole-protection pipe wall and the drill hole wall is reduced; the rotating resistance of the drill pipe is reduced; the drill clamping occurrence probability can be reduced; and the drilling depth and the drilling efficiency are improved.

Description

technical field [0001] The invention belongs to the technical fields of coal seam drilling construction under complex conditions in coal mines, soft and broken rock formation drilling engineering, etc., and in particular relates to a drilling rod for pressure relief and hole protection in soft coal rock drilling. Background technique [0002] The difficulty of drilling in soft coal rock is a recognized worldwide problem. During the drilling construction process, due to the low strength of the coal and rock mass, the deformation of the borehole wall is large, local instability and damage are easy to occur, and drill cuttings are easy to accumulate in the borehole and cause the borehole to be blocked. Hole construction is difficult to carry out. In the past 10 years, my country's coal mining enterprises and drilling equipment production units have invested a lot of manpower and financial resources. On the whole, drilling equipment tends to have high power, high torque, and hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/22
Inventor 王永龙
Owner 王永龙