Drilling assembly for drilling holes in subsurface formations

Details Drilling assembly for drilling holes in subsurface formations Drilling assembly for drilling holes in subsurface formations

E - Fixed Constructions

21

B

E21B 4/02 (2006.01) E21B 7/06 (2006.01)

Patent

CA 2188332

A drilling assembly for drilling holes in subsurface formations comprises a drill bit, a drive unit including a housing and a rotor operatively coupled to the drill bit to rotate the drill bit relative to the housing, and a modulated bias unit coupled to rotate with the drive unit housing and apply a lateral bias thereto in synchronism with rotation of the housing. The modulated bias unit comprises one or more hydraulic actuators including members which, in use, bear against the sides of the borehole, and means for modulating the pressure of fluid supplied to the actuators in synchronism with rotation of a component of the drilling assembly, and in selected angular phase relation thereto, whereby each hydraulic actuator is actuated in a selected rotational position of the component.

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