A kind of extended pdc drill bit with centralizer

Abstract

The invention belongs to the field of PDC drill bits, and in particular relates to an extended PDC drill bit with a centralizer, which includes a rear connection structure and a front control structure. The front control structure is composed of a PDC drill bit, a centralizer mechanism and a rotating mechanism. The PDC The right side surface of the drill bit is threadedly connected to the left side surface of the rotating mechanism, the right side surface of the rotating mechanism is fixedly connected to the left end surface of the centralizer mechanism, and the right side of the PDC drill bit is slidably connected to an extension mechanism. The present invention arranges the extension mechanism so that when the PDC drill bit at the front end of the extension mechanism contacts the rock and grinds the rock, the rear end of the extension mechanism fixedly connected passes through the spring rod on the surface on the left side of the block. And compress the spring, so that the connecting rod connected with the middle part on the left side of the block can slide in the slide tube, so that the elongation drill bit in the PDC drill bit stretches out and contacts with the rock in the middle part, and realizes the lengthening effect of the PDC drill bit.

Description

technical field [0001] The invention belongs to the field of PDC drill bits, in particular to an extended PDC drill bit with a centralizer. Background technique [0002] The polycrystalline diamond compact drill bit is a composite sheet whose shape is circular and welded on a cylindrical cutting tool, and the cutting tool is mounted on the bit body to become a PDC drill bit, which is mainly used for geological exploration and exploration. It is suitable for soft to medium-hard rock formations, and now some manufacturers have newly developed new composite sheets that can be applied to rock formations with tenth hardness. [0003] The traditional PDC bit has a single bit body structure, and long-term use of it for exploration or oil well drilling may cause greater wear and tear on the PDC bit, resulting in shortened service life of the PDC bit, and in the exploration of the well. The PDC bit equipment equipped with centralizers may cause the shaft to fail to drill according t...

AI Technical Summary

Problems solved by technology

[0003] The traditional PDC bit has a single bit body structure, and long-term use of it for exploration or oil well drilling may cause greater wear and tear on the PDC bit, resulting in shortened service life of the PDC bit, and in the exploration of the well. PDC bit equipment equipped with centralizers may cause the shaft to fail to drill according to the preset movement trajectory, while the PDC bits currently on the market are all fixed structures and cannot be extended

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