Design method of PDC drill bit internal nozzle structure

Abstract

The present invention relates to a design method of a nozzle structure inside a novel PDC drill used in the oil drilling industry, the design method is characterized in that the number of the drill blades is designed to distribute in evenly numbered way; one drill nozzle of the flow passage and one drill nozzle of the opposite flow passage are placed in the same surface; and the central axis of two drill nozzle branches must be designed to intersect at the central axis of the drill. The detail steps are that firstly the position of a blade is fixed, and than the position of a corresponding drill nozzle branch is fixed, and the central axis of the drill nozzle branch is intersected with the central axis of the drill; the axis of another drill nozzle branch which can be fixed from a point of intersection A, and determined together by the design obliquity Theta thereof and the point A; and then the position of the drill nozzle can be fixed according to the axis; the structure of the drill nozzle designed according to the present invention has the advantages that the structure can eliminate the caused torquemoment and the transverse acting force of dill caused by jet stream after mud jets stream through the drill nozzle, thereby guaranteeing the stability of the drill working performance and non-deviation of the well eye.

Description

[0001] Technical field [0002] The invention relates to a design method for a novel PDC drill bit internal nozzle structure used in the oil drilling industry. Background technique [0003] PDC bit (Polycrystalline Diamond Compact Bit) uses polycrystalline diamond compact as a cutting element to break rock by cutting. It has good comprehensive economic performance and is a practical drilling tool in the oil drilling industry. PDC drill bits are widely used all over the world. In homogeneous medium to soft formations, the PDC bit has the advantages of high rock breaking efficiency, fast drilling speed, large footage and long service life. However, in the process of research, development and use, the PDC bit still has problems such as wear, tooth loss, fracture and bit balling of the PDC bit, which seriously reduces the service life of the expensive PDC bit. It was found that these damages were mainly caused by the inability of the drill bit to work stably downhole. [0004] ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the stability of the drill bit, and at the same time prevent the drill bit from deviating from the center of the borehole to cause well deviation, thereby solving the problems of tooth wear, tooth loss, and fracture in the use of the PDC bit, improving the stability of the PDC bit, and providing a drill bit that is beneficial The Design Method of Stable Drill Bit Internal Nozzle Structure

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