Drill bit used for double-wall drill pipe reverse circulation drilling

A double-wall drill pipe and reverse circulation technology, which is applied to drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of incompatibility of manufacturing cost and structural strength, poor chip removal ability, etc., to ensure strength and reduce processing costs. , the effect of reducing manufacturing costs

Active Publication Date: 2017-07-04
大庆天瑞机械制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a drill bit for double-walled drill pipe reverse circulation drilling to solve the problems that the manufacturing cost and structural strength of the existing drill bit cannot be balanced and the chip removal ability is poor.

Method used

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  • Drill bit used for double-wall drill pipe reverse circulation drilling
  • Drill bit used for double-wall drill pipe reverse circulation drilling

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawing:

[0018] The present invention includes a drill bit body, the drill bit body includes a steel core and a tungsten carbide sintered layer 6, and an annular groove 5 is arranged on the outside of the steel core, and the tungsten carbide sintered layer 6 is sintered and filled around the steel core and on the drilling surface. In the annular groove 5 , the end of the tungsten carbide sintered layer 6 is provided with a blade 1 . The steel core is welded by the steel core main body 4 and the steel core end cover 3. The end of the steel core main body 4 away from the steel core end cover 3 is provided with threads for connecting double-walled drill pipes. The center of the steel core A chip removal flow channel 7 is provided, and a liquid injection flow channel 8 is arranged around the chip removal flow channel 7. One end of the liquid injection flow channel 8 located on the steel...

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PUM

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Abstract

The invention belongs to the field of drilling equipment, and especially relates to a drill bit used for double-wall drill pipe reverse circulation drilling. The drill bit comprises a drill bit body, and the drill bit body comprises a steel core and a tungsten carbide sinter layer. The outer side of the steel core is provided with an annular groove. The tungsten carbide sinter layer is sintered on the periphery of the steel core and a drilling surface, and is filled in the annular groove. The end of the tungsten carbide sinter layer is provided with a blade wing. The strength of the drill bit is ensured, and manufacturing cost of the drill bit is reduced. Specifically, a structure of attaching the tungsten carbide sinter layer out of the steel core is used, strength of the drill bit is ensured on structure, an integrated structure is abandoned, and a processing method of sintering silicon carbide after welding split steel cores, so that processing cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment, in particular to a drill bit for reverse circulation drilling of a double-walled drill pipe. Background technique [0002] Double-wall drill pipe reverse circulation drilling (Reel Well drilling) technology is a new drilling technology, it is based on double-wall drill pipe, drilling fluid is pumped into the well from the double-wall drill The cuttings are carried in the rod and returned to the ground, so as to realize the closed loop circulation of drilling fluid. The double-wall drill pipe reverse circulation drilling technology was originally proposed to solve the problem of borehole cleaning in coiled tubing drilling. Since the double-wall drill pipe reverse circulation drilling technology was established in 2004, it has been mainly carried out by Statoil and the Norwegian Scientific Research Council for theoretical research, R&D and testing of supporting equipment. In 2005, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46E21B10/60
CPCE21B10/46E21B10/60
Inventor 王跃忠
Owner 大庆天瑞机械制造有限公司
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