US Patent 11852015 Rotary steerable drilling system

A bias subsystem for a steerable bottom hole assembly (BHA) includes a housing having a rotational axis; a plurality of flow conduits in the housing to convey drilling fluid received at an upstream end of the housing towards a downstream end of the housing; a plurality of hydraulic thrust structures each extending from within the housing to the periphery of the housing; and a plurality of valve conduits in the housing to each convey drilling fluid to a respective one of the hydraulic thrust structures, wherein the flow conduits are not intermediate the hydraulic thrust structures and the rotational axis.