Tricone PDC concentric drill bit

Abstract

The invention provides a tricone PDC concentric drill bit. The tricone PDC concentric drill bit consists of a tricone PDC concentric drill bit and a PDC drill bit, wherein a pilot bit at the front endof the lower part of the tricone PDC concentric drill bit is the tricone PDC drill bit, and an reaming bit following an opening of the tricone PDC concentric drill bit is the PDC drill bit, so that atwo-stage drill bit is formed; the rotating axes of the upper and lower two-stage drill bits are overlapped; and the tricone PDC drill bit and the PDC drill bit are connected in a regular buckling manner through conical threads. The tricone PDC concentric drill bit is the combination of the tricone drill bit and the PDC drill bit; the tricone drill bit is the pilot bit with smaller diameter, thePDC drill bit is an expanding bit with larger diameter, and the rotating axes of the tricone drill bit and the PDC drill bit are overlapped, so that the advantages of the tricone drill bit and the PDCdrill bit are combined, and the efficient rock breaking of the two-stage drill bits is realized; the mechanical drilling speed potential is high; the mechanical drilling speed is improved; the drilling footage of the drill bit is increase; the underground accidents such as mud bags are decreased; the stratum applicability is wide; and a new technical scheme for improving the speed and the efficiency of the ground drilling operation with high deep hardness is supplied.

Description

technical field [0001] The invention relates to the technical field of a PDC drill bit, in particular to a tricone PDC concentric drill bit. Background technique [0002] Drilling is an important link in the exploration and development of oil and gas and deep mineral resources. As an important tool for breaking rocks in the drilling process, the ability to select an appropriate drill bit according to the formation characteristics and drilling process conditions is the main factor affecting the drilling speed and cost. Drill bits used in oil and mineral exploration drilling are divided into three categories: roller cone bits, diamond material bits and scraper bits. That is, there are three types of TSP drill bits. At present, drilling operations are developing into deep and complex formations, and the number of deep and ultra-deep wells has increased. The traditional tricone and PDC bits have low rock breaking efficiency, slow ROP, short footage of a single bit, serious dri...

AI Technical Summary

Problems solved by technology

At present, drilling operations are developing towards deep and complex formations, and the number of deep wells and ultra-deep wells is increasing. The traditional three-cone and PDC bits have low rock-breaking efficiency, slow mechanical drilling speed, short footage of a single bit, serious drill bit effectiveness, and short service life. Frequent drilling changes cannot meet the requirements of increasing drilling speed and efficiency in deep complex formations. There is an urgent need to develop new drill bits with higher rock breaking efficiency, wide application range and long service life.

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