System for drilling deviated boreholes
Patent 5163521 Issued on November 17, 1992. Estimated Expiration Date: 
August 27, 2011. 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.
August 27, 2011. 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 References 3255353 3841420 3889228 3930220 Lock-in noise rejection circuit Acoustical pick-up for reception of signals from a drill pipe Angle adjustment sub Wellbore instrument hanger Bit identification system for borehole acoustical telemetry system Borehole telemetry system automatic gain control InventorsAssigneeApplicationNo. 750650 filed on 08/27/1991US Classes:175/40, WITH SIGNALING, INDICATING, TESTING OR MEASURING175/41, Ray energy detection or measuring175/45, Tool position direction or inclination measuring or indicating within the bore175/50, Indicating, testing or measuring a condition of the formation175/61, Boring curved or redirected bores175/107, Fluid rotary type367/83Through well fluidsExaminersPrimary: Novosad, Stephen J.Attorney, Agent or FirmForeign Patent References
International ClassesE21B 007/08E21B 047/12 Foreign Application Priority Data1990-08-27 CAAbstractImproved techniques are provided for drilling a deviated borehole through earth formations utilizing a rotary bit powered by a drill motor, and for obtaining information regarding the borehole or earth formations while drilling. An inclinometer is positioned below the drill motor and within a sealed cavity of a housing fixed to a drill motor sub, and a transmitter within the sealed cavity forwards acoustic or radial wave signals to a receiver provided in a measurement-while-drilling tool. The MWD tool may be provided within a non-magnetic portion of the drill string, and further houses an accelerometer for sensing borehole direction. Both borehole inclination and directional signals are transmitted to the surface by the MWD tool, and the drilling trajectory is altered in response to the signals.Other References
Field of SearchOf boring means including a below-ground drive prime moverOf advance or applied tool weight Tool position direction or inclination measuring or indicating within the bore Boring curved or redirected bores Fluid rotary type Ray energy detection or measuring WITH SIGNALING, INDICATING, TESTING OR MEASURING | |
