Drag bits with predictable inclination tendencies and behavior
Patent 6308790 Issued on October 30, 2001. Estimated Expiration Date: 
December 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 22, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDownhole weight-on-bit control for directional drilling Curved drilling apparatus Method and system of trajectory prediction and control using PDC bits Drill bit with performance-improving cutting structure Stability enhanced drill bit and cutting structure having zones of varying wear resistance Drill bits with predictable walk tendencies Patent #: 5937958 InventorsAssigneeApplicationNo. 470525 filed on 12/22/1999US Classes:175/73, MEANS TRAVELING WITH TOOL TO CONSTRAIN TOOL TO BORE ALONG CURVED PATH76/108.4, Well drill175/398, Nonsymmetrical bit175/431Having a particular orientation or locationExaminersPrimary: Neuder, William P.Attorney, Agent or FirmForeign Patent References
International ClassE21B 010/46AbstractA drill bit with dropping tendencies includes an active region, a passive region, a biased mass distribution, an uneven torque generation, and an imbalance force vector directed toward the middle of the active region. Cutting elements in the active region of the drill bit may be more aggressive than those in the passive region through manipulation of, e.g., backrake angle, blade length, cutter sizes, blade angles and bit profile. The imbalance force vector may be achieved by manipulation of bit geometric parameters such as cutter radial position, angular position, longitudinal position, and rake angle. | |
