Rotary steerable system with rolling housing

A directional drilling system for drilling a directional wellbore having a wellbore wall, comprising:

• an outer housing;
• a driveshaft located at least partially within the housing and rotatable with respect to the housing;
• a drill bit rotatable by the driveshaft;
• extendable members movable to extend radially outwardly from the housing so as to apply a force onto the wellbore wall at a first radial orientation, thereby pushing the drill bit laterally at a first toolface, wherein decreasing the force applied by the extendable members onto the wellbore wall permits the outer housing to rotate with the driveshaft and into a second radial orientation;
• a hydraulic actuation system configured to control the extension and retraction of the extendable members, the hydraulic actuation system comprising a hydraulic pump located in a portion of the driveshaft and a piston device mechanically coupled to the extendable members and hydraulically coupled to the hydraulic pump so as to move the extendable members upon an increase or decrease in hydraulic pressure from the hydraulic pump;
• and
• a control system comprising a processor and a sensor, the control system configured to monitor positional parameters of the housing and control extension and retraction of the extendable members via the hydraulic actuation system.

A method of drilling a directional wellbore having a wall, comprising:

• rotating an outer housing of a drilling device to a first rotational orientation relative to the wellbore via rotation of a driveshaft;
• radially outwardly extending an extendable member from the outer housing into engagement with the wellbore wall via a hydraulic actuation system comprising a hydraulic pump located in a portion of the driveshaft and a piston device mechanically coupled to the extendable member and hydraulically coupled to the hydraulic pump, thereby restraining the outer housing from rotating with the driveshaft and pushing a drill bit off-center at a first toolface;
• and
• drilling the wellbore in the orientation of the first toolface to deviate the wellbore.