Drilling A Borehole With A Steering System Using A Modular Cam Arrangement

A rotary steerable system (“RSS”) comprising:

• a steering head;
• a cam system comprising:
• a housing;
• a cam positioned at least partially within the housing;
• and
• a solid cam shaft engaged with the cam and positioned at least partially within the housing, wherein the cam is operable to adjust an azimuthal orientation of the solid cam shaft;
• a shaft cap coupled to the solid cam shaft at an end opposite of the cam, wherein the shaft cap comprises a bore and a channel to allow a drilling fluid to flow from an area outside the shaft cap between the solid cam shaft and the housing into the bore of the shaft cap;
• a constant velocity shaft coupled to the shaft cap;
• and
• a drill bit engaged with the CV shaft.

A method for drilling a wellbore into a formation comprising:

• deploying a drill string comprising a rotary steerable system into the wellbore;
• adjusting an angular direction of a drill bit using a cam system comprising a solid cam shaft and a cam engaged with the solid cam shaft and operable to adjust an azimuthal orientation of the solid cam shaft;
• and
• drilling the borehole with the drill bit in the azimuthal orientation.