1
John D Barr, Richard E Thorp, Robert A Russell: Modulated bias unit for rotary drilling. Camco Drilling Group, May 28, 1996: US05520255 (166 worldwide citation)

A modulated bias unit, for controlling the direction of drilling of a rotary drill bit when drilling boreholes in subsurface formations, comprises a number of hydraulic actuators spaced apart around the periphery of the unit, each having a movable thrust member which is hydraulically displaceable ou ...


2
Richard E Thorp: Modulated bias unit for rotary drilling. Camco Drilling Group, September 10, 1996: US05553679 (145 worldwide citation)

A modulated bias unit, for controlling the direction of drilling of a rotary drill bit when drilling boreholes in subsurface formations, comprises a number of hydraulic actuators spaced apart around the periphery of the unit. Each actuator comprises a movable thrust member which is hydraulically dis ...


3
Richard E Thorp, Raju M Eason, Charles Borsos: Pressure compensation and rotary seal system for measurement while drilling instrumentation. Schlumberger Technology Corporation, Chadwick A Sullivan, Brigitte Echols, June 3, 2014: US08739897 (2 worldwide citation)

A pressure compensation system for a wellbore instrument coupled to a drill string includes a shaft rotatably mounted with respect to an instrument housing. A lubrication chamber included in the instrument has at least one bearing for rotatably supporting the shaft. The lubrication chamber includes ...


4
Steven J Pringnitz, Brian E Boling, Richard E Thorp: Wellbore communication system. Schlumberger Technology Corporation, Schlumberger Oilfield Services, September 28, 2006: US20060214814-A1

A telemetry system for a downhole tool positionable in a wellbore penetrating a subterranean formation is provided. The telemetry system includes a telemetry tool engageable within the downhole tool. The telemetry tool including a telemetry unit, the unit being interchangeable between a mud pulse te ...


5
Richard E Thorp, Raju M Eason, Charles Borsos: Pressure compensation and rotary seal system for measurement while drilling instrumentation. Schlumberger Technology Corporation, Schlumberger Oilfield Services, May 28, 2009: US20090133930-A1

A pressure compensation system for a wellbore instrument coupled to a drill string includes a shaft rotatably mounted with respect to an instrument housing. A lubrication chamber included in the instrument has at least one bearing for rotatably supporting the shaft. The lubrication chamber includes ...