Drill rod adopting pangolin scale biomimetic structure

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...

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

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