Composite cutting diamond drill bit

Abstract

The invention relates to a composite cutting diamond drill bit. The drill bit comprises a drill bit body, fixing blades, disc cutters, water channel grooves and water passages or spray nozzles. The fixing blades extend from the drill bit body and are fixedly connected with the drill bit body, the water channel grooves are located among the fixing blades, blade cutting elements are arranged on thefixing blades, and one or more disc cutter cutting units are arranged on the drill bit body, wherein each disc cutter cutting unit is composed of a disc cutter, disc cutter cutting teeth on the disc cutter and a disc cutter shaft; the disc cutters are installed on the disc cutter shafts or are integrated with the disc cutter shafts, and the deviation angle alpha of the disc cutters is larger thanor equal to 20 degrees and smaller than or equal to 90 degrees. The composite cutting diamond drill bit is characterized in that one or more disc cutters are arranged on one fixing blade or in the water channel groove between every two fixing blades, the two sides of each disc cutter cutting unit are supported on supporting bodies respectively and rotatably connected with the supporting bodies, the service life of disc cutter bearings can be effectively prolonged, the safety performance of the disc cutter cutting units during use is improved, the rock breaking efficiency of the drill bit is effectively improved, and the service life of the drill bit is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical equipment fields of petroleum and natural gas drilling engineering, mining engineering, building foundation engineering construction, geological drilling, tunnel engineering, hydrology and non-excavation, and specifically relates to a composite cutting diamond drill bit. Background technique [0002] The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. Tri-cone bits and PDC (polycrystalline diamond compact) bits are the most widely used bits in drilling engineering today. [0003] Tri-cone bits mainly break rock in the form of impact crushing. Most of the cone offset angles of the existing tricone bits do not exceed 5°. When the drill bit rotates and drills at the bottom of the well, the wheel body speed ratio (the ratio of the cone speed to the drill bit speed when the drill bit rotates and drills) is greater than 1. The rotation speed of the wheel around the jou...

AI Technical Summary

Problems solved by technology

Because the bearing system adopts a single-side support structure, there are deficiencies or defects in the bearing system. If the drill bit encounters shock or vibration during drilling, it will affect the service life of the bearing system, and then affect the service life of the drill bit.

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