| 主权项 |
1. A downhole system for drilling a wellbore with a portion having a short radius of curvature, which is less than 21.3 meters, the downhole system comprising:
a drill assembly having a leading end and a trailing end, the drill assembly comprising: a high-speed motor having a first longitudinal axis, wherein the high-speed motor has a free-spinning speed greater than 1000 revolutions per minute, a tubular housing having a second longitudinal axis, an actuator at least partially disposed within the tubular housing, the actuator coupling the motor to the tubular housing, and wherein the actuator is configured to selectively articulate between a straight configuration, where the first longitudinal axis of the motor is substantially coincident with the second longitudinal axis of the tubular housing, and a bent configuration, where the first longitudinal axis of the motor forms an angle with the second longitudinal axis of the tubular housing, wherein the angle in the bent configuration is at least four degrees; a first flexible conduit fluidly-coupling the motor to the tubular housing; at least one anti-torque anchor fluidly-coupled to the trailing end of the drill assembly, the at least one anti-torque anchor configured to engage a wall of the wellbore such that, when the at least one anti-torque anchor is deployed downhole, a rotational motion of the drill assembly is substantially restrained while a longitudinal motion is substantially allowed; and wherein the leading end of the drill assembly includes a drill bit coupled to the motor. |
