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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 ...


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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
John D Barr: Modulated bias unit for rotary drilling. Camco Drilling Group, December 10, 1996: US05582259 (131 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 ...


4
Richard Edward Thorp: Modulated bias unit for rotary drilling. Camco Drilling Group of Hycalog, October 7, 1997: US05673763 (94 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 ...


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