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Multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling and drilling method

An open, soft coal seam technology, applied in drilling equipment and methods, drill pipes, drill pipes, etc., can solve problems such as affecting the gas extraction range and extraction efficiency, low drilling efficiency, and easy blockage of drilling holes. Achieve the effect of preventing heat accumulation, improving drilling efficiency and increasing drilling depth

Active Publication Date: 2016-05-04
HENAN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, drilling construction in soft coal seams is a technical problem in gas drainage. Soft coal seams are dominated by Class III crushed coal (coal firmness coefficient f=0.25~0.5) and Class IV mylonitic coal (f<0.3). During the drilling process, due to factors such as ground stress, gas pressure, and coal body structural stress, the borehole shrinks seriously. Shallow drilling depth, low drilling efficiency, and low hole formation rate directly affect the range and efficiency of gas drainage, and indirectly affect the mining efficiency, safety production and economic benefits of coal seams

Method used

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  • Multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling and drilling method
  • Multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling and drilling method
  • Multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling and drilling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one: if Figure 1 ~ Figure 3As shown, the soft coal seam of the present invention is drilled into a multi-wing concave open type bionic resistance reducing drill pipe, including a multi-wing concave open type concave connector 1, a multi-wing concave open hollow rod body 2 and a multi-wing concave The open convex connector 3, the multi-wing concave open concave connector 1, the multi-wing concave open hollow rod body 2 and the multi-wing concave open convex connector 3 are coaxially arranged, and the multi-wing concave open concave The connector 1 and the multi-wing concave open convex connector 3 are respectively connected to the two ends of the multi-wing concave open hollow rod body 2, the multi-wing concave open concave connector 1, the multi-wing concave open hollow rod body 2 A fluid channel 8 communicating with the multi-wing inner concave open convex connector 3 is axially provided; the multi-wing inner concave open concave connector 1, the multi-wing...

Embodiment 2

[0054] Embodiment two: if Figure 4 ~ Figure 6 As shown, the difference from the first embodiment is that there are three arc-shaped wings 5 ​​designed for the cross-section of the drill rod, and the usage method of the second embodiment is the same as that of the first embodiment.

Embodiment 3

[0055] Embodiment three: as Figure 7 ~ Figure 9 As shown, the difference from Embodiment 1 and Embodiment 2 is that the cross-section of the drill rod is designed with four arc wings 5, and the usage method of Embodiment 3 is the same as that of Embodiment 1 and Embodiment 2.

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Abstract

Provided is a multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling. The drill rod comprises a multi-blade inwards-concave open-type concave connecting part, a multi-blade inwards-concave open-type hollow rod body and a multi-blade inwards-concave open-type convex connecting part; at least two long grooves are formed in the surfaces of the multi-blade inwards-concave open-type concave connecting part, the multi-blade inwards-concave open-type hollow rod body and the multi-blade inwards-concave open-type convex connecting part in the axial direction, all the long grooves are evenly arranged in the peripheral direction, and the cross section of each long groove is of an arc-shaped structure; the peripheral surfaces of the multi-blade inwards-concave open-type concave connecting part, the multi-blade inwards-concave open-type hollow rod body and the multi-blade inwards-concave open-type convex connecting part are separated by the long grooves to form arc-shaped wings for high-speed rotating drilling, bionic structures are evenly arranged on the outer peripheral surfaces of the multi-blade inwards-concave open-type concave connecting part, the multi-blade inwards-concave open-type hollow rod body and the multi-blade inwards-concave open-type convex connecting part, and the bionic structures are grooves and / or protrusions. By means of the multi-blade inwards-concave open-type bionic drag-reduction hole-protection drill rod for soft coal seam drilling, the drilling resistance of the drill rod is effectively reduced, and improvement of the drilling depth and drilling efficiency of soft coal rock is facilitated.

Description

technical field [0001] The invention belongs to the technical field of soft coal seam drilling engineering, and in particular relates to a multi-wing concave open-type bionic resistance-reducing hole protection drill pipe and a drilling method for drilling soft coal seams. Background technique [0002] Underground gas drainage mainly includes technical links such as hole formation, hole sealing, and connection of holes. Among them, hole formation technology is the most critical, and the depth and efficiency of hole formation determine the efficiency and scope of gas drainage. At present, drilling construction in soft coal seams is a technical problem in gas drainage. Soft coal seams are dominated by Class III crushed coal (coal firmness coefficient f=0.25~0.5) and Class IV mylonitic coal (f<0.3). During the drilling process, due to factors such as ground stress, gas pressure, and coal body structural stress, the borehole shrinks seriously. Shallow drilling depth, low dri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B7/00
CPCE21B7/00E21B17/00
Inventor 王永龙孙玉宁王振锋宋维宾王明中
Owner HENAN POLYTECHNIC UNIV
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