Low-torque diamond drill bit

Abstract

The invention discloses a low-torque diamond drill bit, and belongs to the field of drilling. The low-torque diamond drill bit comprises a drill bit body, multiple blades which stretch from the drillbit body or are fixed to the drill bit body, water holes or spray nozzles and passageways. At least one blade is provided with hanging cutting teeth, at least one blade is only provided with a normalwheel unit, or bases and / or a base stretching from the blade are / is arranged at the front end and / or the rear end of the at least one blade, and normal wheel units are arranged on the bases. The working torque of the drill bit under complex working conditions can be remarkably reduced, overloading or premature failure, caused by too high torque of the drill bit, of the drill bit and matching toolsis reduced, the working stability of the drill bit is improved, and the service life of the drill bit is prolonged. Especially, during directional drilling, by means of the low-torque PDC drill bit,the adjusting time of tool surfaces during directional sliding drilling can be shortened.

Description

technical field [0001] The invention belongs to the field of technical equipment such as oil and gas drilling engineering, mining engineering, building foundation engineering drilling construction, geological drilling, geothermal drilling, hydrological drilling, tunnel engineering, shield tunneling and non-excavation, and in particular relates to a drilling bit. Background technique [0002] Drill bits are rock-breaking tools used to break rocks and form wellbores in drilling engineering. Polycrystalline diamond compact drill bits (PDC bits), roller cone bits and impregnated diamond bits are commonly used. The PDC bit relies on the polycrystalline diamond composite sheet with high hardness, high wear resistance and self-sharpening ability to shear the rock. The PDC bit has the advantages of high penetration rate, long life and low drilling cost in soft to medium hard formations. , It has been widely used in oil and gas exploration, geothermal drilling operations and other pr...

AI Technical Summary

Problems solved by technology

This phenomenon is easy to cause the high-speed rotation and twisting of the drill bit and drilling tool, so that the cutting teeth of the drill bit bear a large circumferential impact load, resulting in chipping, damage, breakage of the drilling tool, and damage to other downhole tools and measuring instruments. , which seriously affects the drilling efficiency

In addition, since the penetration depth of the PDC bit into the formation is particularly sensitive to changes in WOB, coupled with the complexity of the interaction between the cutter and the rock, the PDC bit also has longitudinal vibration along the axial direction of the bit, which will also affect the life of the bit and the ROP. have an impact

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