System for drilling deviated boreholes

Details System for drilling deviated boreholes System for drilling deviated boreholes

E - Fixed Constructions

21

B

325/27, 349/5, 3

E21B 47/022 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 47/01 (2006.01) E21B 47/12 (2006.01) E21B 47/16 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2024061

Improved 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-whils-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.

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