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Drill rod adopting pangolin scale biomimetic structure

A technology of pangolin scales and drill pipes is applied in the field of drill pipes with bionic structures of pangolin scales, which can solve the problems of increasing the risk of coal mine accidents, increasing friction, and easy collapse of drilled holes, so as to prevent the phenomenon of drill pipe locking and easy withdrawal. Effect

Inactive Publication Date: 2015-07-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when drilling in a soft coal seam, the borehole is prone to collapse under the action of in-situ stress
After the hole collapses, due to the large-area wrapping and extrusion of the surrounding wet coal seam and soil, the force-bearing area of ​​the ordinary drill pipe increases, resulting in a greatly increased friction force, which will be locked by the coal seam, resulting in the phenomenon of drill sticking.
Once the drill pipe is locked, it will not be able to advance, retreat and rotate, which not only seriously affects the progress of the operation, but also greatly increases the risk of coal mine accidents
[0004] At present, a lot of researches have been done by domestic and foreign scientific research institutions on the problem of sticking and sticking of ordinary drill pipes in soft coal seams, but the desired results have not been obtained. An effective method is urgently needed to solve this problem. Safe and efficient coal mining provides reliable guarantee

Method used

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  • Drill rod adopting pangolin scale biomimetic structure
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  • Drill rod adopting pangolin scale biomimetic structure

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0022] please see figure 1 , figure 2 , image 3 , the technical solution adopted in the present invention is: a drill rod with a pangolin scale bionic structure, comprising a rod body and 30 hollow frustum-shaped units, the inner holes of the hollow frustum-shaped units are cylindrical inner holes, and the longitudinal intervals are distributed on the outer circumferential surface The ridges and grooves, and the heads and tails of the hollow frustum-shaped units are inlaid together and then tightly sleeved on the rod body and fixed with glue.

[0023] The hollow frustum-shaped unit is injection molded from polyurethane elastomer. The angle between the outer peripheral surface of the hollow frustum-shaped unit and its inner peripheral surface is 10°. Ridges and grooves are longitudinally distributed on the outer peripheral surface of the hollow frustum-s...

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Abstract

The invention discloses a drill rod adopting a pangolin scale biomimetic structure. The drill rod comprises a rod body and hollow circular truncated cone units, wherein an inner cavity of each hollow circular truncated cone unit is cylindrical, bulged ridges and grooves are longitudinally formed in the outer circumference surface of each hollow circular truncated cone unit at intervals, the hollow circular truncated cone units are inlaid together end to end, tightly nested on the rod body and then fixed by glue. Compared with the prior art, the drill rod adopting the pangolin scale biomimetic structure can effectively prevent locking phenomenon of the drill rod during a drilling process of a soft coal seam, so that the drill rod is easy to retreat.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a drill pipe with a bionic structure of pangolin scales. Background technique [0002] Coal resources play a dominant role in my country's energy consumption structure, and the safety and efficient production of coal mines have an important impact on ensuring the security of my country's energy supply and my country's industrial and economic development. [0003] Coal seam drilling is the main link that restricts the safe and efficient production of coal mines. However, when drilling operations in soft coal seams, the boreholes are prone to collapse under the action of in-situ stress. After the hole collapses, the ordinary drill pipe is wrapped and squeezed by the surrounding wet coal seam and soil in a large area, and the stress area increases, resulting in a greatly increased frictional force, which will be locked by the coal seam and cause the drill sticking phenom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00
Inventor 杨晓峰郑海舟巫世晶
Owner WUHAN UNIV
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