Dual Completion Linear Rod Pump

摘要

A dual completion linear rod pumping apparatus for imparting reciprocating vertical motion to a pair of rods for respective sucker-rod pumps. The dual completion linear rod pumping apparatus includes first and second linear mechanical actuator systems disposed in a single housing. These linear mechanical actuator systems impart and control vertical motion of the pair of rods. Each linear mechanical actuator system includes a rack and pinion gearing arrangement. The rack is operatively connected in a gear-mesh relationship with the pinion. The pinion is operatively connected to a rotating output of a motor. Rotation of the motor in a first direction results in an upward motion of the rack and connected sucker rod pump. Rotation of the motor in a second direction opposite the first direction results in a downward motion of the rack and connected sucker rod pump. An electronic controller is operatively connected to the motor.

主权项

1. A dual completion linear rod pumping apparatus, for imparting reciprocating vertical motion to a pair of rods for respective sucker-rod pumps, the dual completion linear rod pumping apparatus comprising:
first and second linear mechanical actuator systems for imparting and controlling vertical motion of the pair of rods, the first and second linear mechanical actuator systems constructed to operate within a single housing, each linear mechanical actuator system comprising: a rack and pinion gearing arrangement, the rack configured to impart a reciprocating motion along a pumping axis; the rack being operatively connected in a gear-mesh relationship with the pinion, the pinion being operatively connected to a rotating output of a motor, such that rotation of the motor in a first direction results in an upward motion of the rack along the pumping axis, and rotation of the motor in a second direction opposite the first direction results in a downward motion of the rack along the pumping axis, the rack also being operatively connected to the rod of the sucker-rod pump such that vertically-upward motion of the rack imparts a vertically-upward motion to the rod of the sucker-rod pump, and such that the rod of the sucker-rod pump exerts a vertically-downward-directed force on the rack, along the pumping axis, during a portion of a pump stroke; a motor having a reversibly rotatable element operatively connected to the pinion which engages the rack to establish a fixed relationship between the rotational position of the pinion and the vertical position of the rack; and an electronic controller operatively connected to the motor, for controlling the motor, wherein the electronic controller operates the motor in a driving mode to urge upward movement of the rack and of the rod, and operates the motor in a braking mode during downward movement of the rack on a downward portion of the stroke of the rod, the electronic controller including one or more sensors for sensing at least one of linear position of the rack along the pumping axis, rotational position of the pinion about the pinion axis, motor torque, motor speed, motor acceleration, and motor input power.