Abstract: A hydraulic pumping assembly provides reciprocating motion to a sucker rod string coupled to a downhole pump. The pumping assembly includes a hydraulic cylinder, a cylinder rod, a telescoping cylinder sleeve for increasing the effective stroke length, and a cylinder base positioned below the hydraulic cylinder. The hydraulic cylinder includes a cylinder barrel, a cylinder head, a piston, and a port configured to direct hydraulic fluid to and from the cylinder barrel. The piston is coupled to the cylinder rod at an upper end of the rod. The cylinder rod slides within the cylinder sleeve, which passes slideably through the cylinder head. The cylinder sleeve moves between an extended position and a retracted position as the piston reciprocates within the cylinder barrel. The cylinder base accommodates the cylinder rod and the telescoping cylinder sleeve in a collapsed position.

Abstract: A hydraulic pumping assembly provides reciprocating motion to a sucker rod string coupled to a downhole pump. The pumping assembly includes a hydraulic cylinder, a cylinder rod, a telescoping cylinder sleeve for increasing the effective stroke length, and a cylinder base positioned below the hydraulic cylinder. The hydraulic cylinder includes a cylinder barrel, a cylinder head, a piston, and a port configured to direct hydraulic fluid to and from the cylinder barrel. The piston is coupled to the cylinder rod at an upper end of the rod. The cylinder rod slides within the cylinder sleeve, which passes slideably through the cylinder head. The cylinder sleeve moves between an extended position and a retracted position as the piston reciprocates within the cylinder barrel. The cylinder base accommodates the cylinder rod and the telescoping cylinder sleeve in a collapsed position.