Patent ID: 9309722
Filing Date: 2016-04-12
CPC Classification: E21B

Claim Text:
1. A system for drilling a borehole, comprising: a drill bit; a rotary steerable drilling system to which the drill bit is coupled in a bottom hole assembly, the rotary steerable drilling system being configured to receive a flowing drilling mud and comprising a mechanism for rotating the drill bit to drill the borehole, the rotary steerable drilling system also having a piston actuated mechanism which rotates with the rotary steerable drilling system and which selectively controls at least one of the directional bias or the axial orientation of the drill bit; a turbine powered independently of the mechanism for rotating the drill bit, the turbine being powered by the flowing drilling mud; and a pressurized oil system connected to the piston actuated mechanism, the pressurized oil system providing pressurized oil to pistons in the piston actuated mechanism, wherein the pressurized oil system comprises an oil pump driven by a shaft which, in turn, is driven by the turbine powered via the flowing drilling mud, the pressurized oil system further comprising an internal pressure relief valve positioned to maintain a constant pump pressure.