Abstract: A surface-driven fluid recovery system for recovery of hydrocarbons, having an uphole prime mover, typically an electric motor, and an uphole speed-reduction transmission to reduce speed of rotation supplied by the prime mover to a rod string to thereby reduce frictional and cyclic fatigue stresses imparted on the rod string. A downhole speed-increasing transmission is provided to increase rotational speed prior to supply of rotational energy to a downhole centrifugal or progressive cavity pump. A magnetic coupling is interposed between the prime mover and the speed reduction gearbox or between the speed reduction gearbox and the rod string, to provide damping of high transient rotational stresses between the prime mover and the rod string and/or provide a method for selectively coupling or partially coupling/decoupling the rod string to the prime mover.

Abstract: A surface-driven fluid recovery system for recovery of hydrocarbons, having an uphole prime mover, typically an electric motor, and an uphole speed-reduction transmission to reduce speed of rotation supplied by the prime mover to a rod string to thereby reduce frictional and cyclic fatigue stresses imparted on the rod string. A downhole speed-increasing transmission is provided to increase rotational speed prior to supply of rotational energy to a downhole centrifugal or progressive cavity pump, to thereby allow optimal rotational speeds to be supplied to the downhole pump. A magnetic coupling is interposed between the prime mover and the speed reduction gearbox or between the speed reduction gearbox and the rod string, to advantageously provide damping of high transient rotational stresses between the prime mover and the rod string and/or provide a means for selectively coupling or partially coupling/decoupling the rod string to the prime mover.