PDC (Polycrystalline Diamond Compact) drill bit applicable to high temperature well drilling

Abstract

The invention discloses a PDC (Polycrystalline Diamond Compact) drill bit applicable to high temperature well drilling, and belongs to the fields of petroleum and natural gas drilling engineering, mine engineering, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shield and trenchless technical equipment. The PDC drill bit comprises a drill bit body, water holesor nozzles arranged on the drill bit body, an inner flow channel arranged on the drill bit body and a plurality of blades extending from the drill bit body, wherein each blade is provided with fixedcutting elements. The PDC drill bit is characterized in that at least one cutting element is provided with a jet hole; the drill bit further comprises branch flow channels extending from the inner flow channel to the blades; the jet holes are communicated with the corresponding branch flow channels; the branch flow channels are used for forming passing channels of a liquid in the inner flow channel; and the jet holes are channels through which the liquid in the inner flow channel sprays out. The invention aims to provide a PDC drill bit applicable to high temperature well drilling, which effectively improves problems of the shortening of the working life and the declining of the drilling ability of the drill bit due to insufficient cooling of the cutting elements during the rock breaking process of the drill bit.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling engineering, mining engineering, building foundation engineering drilling construction, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shield tunneling and trenchless technical equipment, and particularly relates to a high-temperature drilling PDC drill bit. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. In addition to the cutting structure, the hydraulic structure on the drill bit also plays an important role in the rock-breaking efficiency and service life of the drill bit, that is, cooling the cutting teeth, cleaning the bottom of the well, transporting cuttings, and assisting in rock breaking. At present, the design of the hydraulic structure on the drill bit is to arrange nozzles or water holes at different positions on the drill bit body, and the drilling fluid or co...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to: aim at the deficiency of the hydraulic structure of the existing drill bit, propose a PDC drill bit suitable for high-temperature drilling, effectively improve the shortening of the working life of the drill bit due to insufficient cooling of the cutting element during the rock breaking process and the drilling The problem of reduced capacity

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