CPC E21B 7/064 (2013.01) [E21B 7/068 (2013.01); E21B 7/061 (2013.01)] | 20 Claims |
9. A method comprising:
receiving, at a rotary steerable system, pressure from upstream with respect to the rotary steerable system;
directing, by the rotary steerable system, the pressure to an actuation cylinder of the rotary steerable system, the actuation cylinder sealed by a radial seal that is positioned in a groove and between the actuation cylinder and a steering collar of the rotary steerable system, wherein the groove is positioned in the steering collar or in the actuation cylinder, the radial seal stationary with respect to movement of a piston positioned in the actuation cylinder, wherein the piston is slidably coupled to the actuation cylinder and to a steering pad of the rotary steerable system for actuating the steering pad, the piston comprising an orifice to allow a mud jet to be ejected from the orifice in response to the actuation cylinder actuating, the piston positioned in the actuation cylinder to define a gap between the piston and the actuation cylinder to facilitate flow of wellbore fluid, wherein the rotary steerable system includes:
a mud inlet line that is positioned from an upstream location and the actuation cylinder; and
a piston hanger positioned in the piston and adjacent at least to the steering pad for transferring pressure from the piston to the steering pad, the piston hanger including a grooved surface; and
applying, by the rotary steerable system, a steering force to a wall of a wellbore for altering a drilling direction of the rotary steerable system in the wellbore.
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