Polycrystalline diamond compact (PDC) bit with rotatable cutting tooth

Abstract

A polycrystalline diamond compact (PDC) bit with a rotatable cutting tooth comprises a bit body, the bit body is provided with a tool wing, a nozzle and a main fluid channel, and the cutting tooth isinstalled on the tool wing. The PDC bit is characterized in that a first fluid channel connected with the main fluid channel is arranged in the bit body; the cutting tooth is formed by a central rotating tooth, a bush, a limiting device and a hydraulic drive rotator; the bush is provided with a hole connected with the first fluid channel, and a second fluid channel is formed between the bush and the central rotating tooth; a flow channel space is arranged in the central rotating tooth to form a third fluid channel; the main channel, the first fluid channel, the second fluid channel and the third fluid channel communicate in sequence; and the central rotating tooth is provided with a limiting groove, the bush is provided with a limiting hole or a limiting groove, and the central rotating tooth is connected with the bush through the limiting device. The utilization rate of a cutting tooth diamond layer can be improved through the cutting tool of the structure, meanwhile cooling and cleaning of the cutting tooth can be realized, and the service life of the cutting tool is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a rotatable cutting tooth used to be embedded and fixed on a drill bit, and a drill bit with the cutting tooth. Background technique [0002] Polycrystalline diamond tooth (referred to as PDC tooth) is a cutting tooth used to be fixed on the drill body. The cutting teeth are mainly composed of a diamond layer and a cemented carbide matrix. The diamond layer has the characteristics of high hardness, high wear resistance and self-sharpening. The drill bit equipped with PDC teeth is called PDC bit, which is widely used in the field of drilling technology, and has many advantages such as high mechanical drilling speed, long service life and high drilling safety. [0003] In recent years, with the improvement of materials and manufacturin...

AI Technical Summary

Problems solved by technology

When shearing rock, relatively few cutting edges will wear to a certain extent, and the friction between the cutter and the rock will also increase, resulting in an increase in the temperature of the cutter, which in turn causes a larger area of ​​wear, and the drill bit penetrates Efficiency is drastically reduced and the drill bit fails quickly

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