Patent ID: 8763725
Filing Date: 2014-07-01
Classification: E04D,E21B

Abstract:
1. A rotary steerable drilling system comprising: a rotatable housing having a plurality of pistons mounted thereon for reciprocal movement in a radial direction to provide steering inputs; a plurality of valves positioned to control a flow of high-pressure fluid to individual pistons of the plurality of pistons, the plurality of valves being electrically actuated; a control unit to control actuation of the plurality of valves during rotation of the rotatable housing, the control unit receiving drilling information from inclination and azimuth sensors, the control unit and the inclination and azimuth sensors being electrically powered; a battery positioned downhole during operation of the rotary steerable drilling system to supply electrical power to the valves for controlling actuation of the plurality of pistons, the battery also supplying electrical power to the control unit and the inclination and azimuth sensors; and a sleeve disposed around the plurality of pistons, the sleeve being pivotably mounted to a collar of the rotatable housing by a universal joint, the sleeve being coupled to a drill bit such that actuation of the pistons between retracted and extended positions causes adjustment of the angle of the axis of the sleeve, and the drill bit attached thereto, relative to the axis of the collar.