System for drilling deviated boreholes

Details System for drilling deviated boreholes System for drilling deviated boreholes

1996-01-02

1998-05-12

Tsay, Frank

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

By shaft speed or torque responsive means

175 41, 175 45, 175 50, 175 61, 175107, 367 83, E21B 708, E21B 4712

Patent

active

RE0357901

ABSTRACT:
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-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.

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Proceedings, Measurement While Drilling Symposium, Louisiana State University; Telemetry Using the Propagation of an Electromagnetic Wave Along A Drill Pipe String; Baton Rouge, LA, Feb. 26-27, 1990, pp. 47-58, by R. Grudzinski and O. Issenmann.
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A relevant portion of a videotape entitled: "MWD: An Idea Whose Time Has Come".
A photographic image of the tool shown at the lecture, the photographic image being taken off the videotape.
A portion of a lecture recorded on videotape entitled: "MWD: An Idea Whose Time Has Come", by Kenneth R. Weeks, beginning at position 28:23, the lecture was given on Jul. 25, 1990.
A transcript of a relevant portion of the lecture recorded on Videotape.
"Field Measurements of Downhole Drillstring Vibrations", Wolf et al, SPE 14330, 1985.
"Downhole Recording System for MWD", Franz, SPE 10054, 1991.
"NL MWD Services", NL Industries, Inc., Houston, Texas.
"NL Sperry-Sun", 1987.
"Sperry-Sun Horizontal Drilling: A Total Engineering Concept", 1989.

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