Split three-flange drill pipe centralizer for coal mine

Abstract

The invention discloses a split three-flange drill pipe centralizer for a coal mine. The centralizer comprises a main centralizer body, a centralizing assembly and a spring clamp; the main centralizerbody is a triangular prism body with the diameter identical to that of a three-flange drill pipe, sliding grooves are formed in the three flanges of the main centralizer body respectively, and each sliding groove is divided into a dovetail groove segment and a square groove segment; the centralizing assembly comprises three centralizing blocks, the bottom of each centralizing block is fixedly connected to a dovetail sliding key, the dovetail sliding keys are slidingly connected into the sliding grooves, and the length of the dovetail sliding keys is equal to that of the dovetail groove segments; the shape of the spring clamp is matched with that of the cross section of the main centralizer body, a spring clamp mounting groove is formed in the main centralizer body in the circumference direction, the spring clamp is installed in the spring clamp mounting groove, and the side face of the spring clamp is in press contact with the centralizing blocks. The split three-flange drill pipe centralizer can be connected with the three-flange drill pipe and achieves the functions of drilling inclination increasement or inclination stabilization or inclination reduction in the drilling process, the centralizing blocks are detachably connected with the main centralizer body through the dovetail grooves, and connection is reliable.

Description

technical field [0001] The invention relates to the field of underground drilling in coal mines, in particular to a split-type triangular drill pipe centralizer for coal mines. Background technique [0002] Downhole drilling is an indispensable project in the daily production process of coal mines. On the one hand, it is an important means of geological detection in the daily production of coal mines, such as coal seam stability detection, small structure detection, hydrogeological detection, etc.; Gas drainage holes, etc. [0003] Before drilling, the technicians design the opening position and the final hole position according to the purpose of drilling, which determine the design path of drilling—that is, the design axis of the drilling hole. During the construction process, with the extension of the drill pipe length, under the influence of the self-weight of the drill pipe, and the influence of the soft and hard changes of the formation, the pressure on bit, and the d...

AI Technical Summary

Problems solved by technology

However, as a device for increasing, stabilizing or reducing the inclination of the drill hole during the drilling process, centralizers are all cylindrical and only suitable for round drill pipes. At present, there is no centralizer suitable for the drilling effect of triangular drill pipes. device

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