Rotary steerable drilling assembly with a rotating steering device for drilling deviated wellbores

摘要

A drilling assembly for drilling deviated wellbores is disclosed that in one embodiment includes a steering unit having an upper section coupled to a lower section through a tilt device, wherein an electro-mechanical actuation device tilts the tilt device about a selected location in the drilling assembly to cause the lower section to tilt relative to the upper section along a selected direction while the drill string is rotating.