PDC drill bit with module cutting teeth

Abstract

The invention relates to a PDC drill bit with module cutting teeth. The PDC drill bit comprises a drill bit body (1) and a drill bit joint (2) arranged at one end of the drill bit body (1); multiple main blades (3) and multiple secondary blades (4) are arranged at the other end of the drill bit body (1) at intervals; multiple main cutting teeth are respectively arranged on the nose parts and the side surfaces of the main blades (3) and the secondary blades (4); the main cutting teeth comprise wear-resisting module cutting teeth (7) and impact-resisting module cutting teeth (8), wherein the wear-resisting module cutting teeth (7) and the impact-resisting module cutting teeth (8) are of cylindrical structures, the wear-resisting module cutting teeth (7) are composed of a base A (9) and a composite sheet A (10), and the impact-resisting module cutting teeth (8) are composed of a base B (11) and a composite sheet B (12). The PDC drill bit disclosed by the invention has the advantages that the high drilling speed can be maintained, and the long service life is guaranteed, the PDC drill bit is especially suitable for the drilling operation of the complex and abrasiveness stratum.

Description

technical field [0001] The invention relates to a downhole tool drill bit in the field of oil and gas field drilling operations, in particular to a PDC drill bit with modular cutting teeth. Background technique [0002] During the drilling process, the total footage is an index to measure the drilling performance of the drill bit, including the ROP and the service life of the drill bit. During the drilling process of the drill bit, the length of the effective cutting edge in contact with the rock during the initial drilling is relatively short, the specific pressure is high, and the ROP is high; when the drill bit is continuously drilling, the wear amount of the drill bit and the effective cutting edge As the length increases, the specific pressure decreases, resulting in a decrease in ROP. For example, if the cutting unit is a circular composite sheet, the length of the cutting edge increases continuously during the drilling process, resulting in a rapid drop in specific p...

AI Technical Summary

Problems solved by technology

For example, if the cutting unit is a circular composite sheet, the length of the cutting edge increases continuously during the drilling process, resulting in a rapid drop in specific pressure, which will sharply reduce the rock breaking efficiency and drilling efficiency

At the same time, the effective wear volume of the cutting unit corresponds to the mission of the drill bit, resulting in a reduction in the service life of the drill bit

[0003] In the current research at home and abroad, in order to improve the drilling speed of the drill bit and the service life of the drill bit, relevant experts and scholars in this field have conducted a lot of research, but most of the research is by optimizing the structural parameters of the drill bit and improving the material of the drill bit. Performance can be changed, or combined with downhole vibration to accelerate rock breaking, but these methods have failed to make a major breakthrough and change in improving the drilling speed and service life of the drill bit.

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