Schlumberger Technology Corporation

Dean Gardner

Ashley Bernard Johnson

Walter David Aldred

Maurice Ringer

Edward Richards

Devi Putra

Peter Tutton

Angie Theresia

A downhole communication system includes a mud pulse generator that generates a set of pressure pulses in a pattern, the pattern including encoded data. A roll stabilized platform includes a turbine that is rotatable in response to the pressure pulses. The rotational rate of the turbine is correlated with a pressure value. A processor on the roll stabilized platform demodulates the pressure pulse pattern, and then decodes the encoded data.

Systems and methods for downhole communication

A drill string suitable for use in directional drilling of a borehole, comprising a rotatable shaft at the leading end of which is a drill bit, and wherein the shaft comprises a variable friction inducing member, which provides rotational friction by physical contact with an inside face of the borehole, the friction inducing member being arranged to exert a first rotational frictional force when the shaft in the vicinity of the member is substantially rotating and a second rotational frictional force when the shaft in the vicinity of the member is substantially not rotating, wherein the first rotational frictional force is less than the second rotational frictional force.

Method for torque stabilization of a drilling system

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Selsdon, United Kingdom

Dean Gardner