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AssigneeShell Oil Company
InventorsSebastien Arnaud Chevallier, Alban Michel Faure, Peter Oosterling
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A downhole tool for providing a thrust force to an elongate body extending in a borehole formed in an earth formation is provided. The tool comprises at least one rotatable body provided with a plurality of rollers, each roller being expandable against the borehole wall at a selected contact force between the roller and the borehole wall. The rollers are oriented when expanded against the borehole wall so as to roll along a helical path on the borehole wall, and a motor is provided to rotate each rotatable body. The tool further comprises a device to measure the thrust force provided by the tool and a control system to control the thrust force provided by the tool by regulating the rotative torque of the rotatable body, in response to the measured thrust force.
A downhole tool for providing a thrust force to an elongate body extending in a borehole formed in an earth formation, the tool comprising at least one rotatable body provided with a plurality of rollers, each roller being expandable against the borehole wall at a selected contact force between the roller and the borehole wall, the rollers being oriented when expanded against the borehole wall so as to roll along a helical path on the borehole wall, and a motor to rotate each rotatable body, wherein the tool further comprises measuring means to measure the thrust force provided by the tool and a control system to control the thrust force provided by the tool by regulating the rotative torque of the rotatable body, in response to the measured thrust force.
A downhole tool for providing a thrust force to a drilling assembly extending in a borehole formed in an earth formation, the tool comprising at least one rotatable body provided with a plurality of rollers, each roller being expandable against the borehole wall at a selected contact force between the roller and the borehole wall, the rollers being oriented when expanded against the borehole wall so as to roll along a helical path on the borehole wall, and a motor to rotate each rotatable body, wherein the direction of rotation of the rotatable body is opposite to the direction of rotation of a drill bit located at the lower end of the drilling assembly.
Dependencies are inferred from the claim text.