A drill pipe with a bionic structure on the surface of an earthworm

Abstract

The invention discloses a drill rod with an earthworm body surface bionic structure. The drill rod comprises a rod body and a spiral spring ring; the spiral spring ring is tightly wound on the round peripheral face of the rod body in a right-handed thread mode, and is fixed by glue; and the spiral spring ring is formed by injection molding of polyurethane elastomer, has a radius of R being equal to 2mm, and is fixed at the peripheral face of the rod body by the glue. Compared with the prior art, the drill rod with the earthworm body surface bionic structure can effectively prevent the locking phenomenon in the drilling process of a soft coal layer, and the drill rod can be easily withdrawn.

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 on the surface of an earthworm. Background technique [0002] Coal resources are the most important and important energy source in my country. The safety and efficient production of coal mines have an important impact on ensuring the security of energy supply in China and the development of my country's industry and economy. [0003] When drilling in a soft coal seam with high water content and poor soft cohesion, the borehole is 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 phenomenon. Once the drill pipe is locked, it will not be able to advance...

AI Technical Summary

Problems solved by technology

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, domestic and foreign research institutions have conducted a lot of research on the problem of sticking and sticking of ordinary drill pipes in soft coal seams, but they have not achieved ideal results. An effective method is urgently needed to solve this problem, so as to improve the quality of coal. Production efficiency guarantees the safe and stable development of my country's coal industry

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