PDC (Polycrystalline Diamond Compact) drilling bit with circular shoulders

Abstract

A PDC (Polycrystalline Diamond Compact) drilling bit with circular shoulders comprises an upper body and a lower body, wherein the upper end of the upper body is provided with screw threads, the lower body is provided with cutting teeth, the centers of the upper body and the lower body are provided with a water way, the upper part of the water way is a straight hole, and the lower part inclines radially. The PDC drilling bit is characterized in that the upper body and the lower body are in an integrated structure formed at one time, have circular shoulders and form a steel PDC drilling bit. The PDC drilling bit uses the integrated structure formed at one time, has circular transition shoulders, and has the characteristics of improving the flow field of drilling fluid in a downhole, being beneficial to cooling of the cutting teeth and cuttings logging, reducing repeated breaking of rock debris in the downhole, effectively preventing bit bailing, and reducing torque generated by reciprocity between the drilling bit and the rock debris. The PDC drilling bit has the advantages of few process, low difficulty, high precision, good quality, high speed of pulling out from a well, high efficiency, low cost, and the like. The PDC drilling bit is widely applied to geological exploration, drilling, and the like.

Description

1. Technical field [0001] The invention relates to a drill bit, in particular to a shoulder arc type PDC drill bit. 2. Background technology [0002] There is a PDC drill bit, the structure of which is a two-body structure in which the upper body and the lower body are welded together after processing respectively. The drill bit of this structure has made contributions to geological exploration, oil drilling and other projects, but it has the following disadvantages at the same time Or insufficient: ①Because the upper body and the lower body are processed separately and then welded together, there are many processing procedures, great difficulty, low precision, low efficiency, and difficult to guarantee the quality; ②Since the connection between the upper body and the lower body, that is, the shoulder is relatively large The angular structure is not conducive to cooling the cutting teeth; ③ aggravates the repeated crushing of cuttings at the bottom of the well; ④ is not cond...

AI Technical Summary

Problems solved by technology

[0002] There is a PDC drill bit, the structure of which is a two-body structure in which the upper body and the lower body are welded together after being processed separately. The drill bit of this structure has made contributions to geological exploration, oil drilling and other projects, but it has the following disadvantages at the same time Or insufficient: ①Because the upper body and the lower body are processed separately and then welded together, there are many processing procedures, great difficulty, low precision, low efficiency, and difficult to guarantee the quality; ②Since the connection between the upper body and the lower body, that is, the shoulder is relatively large The angular structure is not conducive to cooling the cutting teeth; ③ aggravates the repeated crushing of cuttings at the bottom of the well; ④ is not conducive to cuttings logging; ⑤ is easy to form mud balls on the drill bit;

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