PUMPING ASSEMBLY

摘要

A pumping assembly includes a hydraulic pump having a hydraulic ram tied to a reciprocating annular piston having a central bore. When the annular piston moves in an upward direction, the hydraulic ram moves toward an extended position extending from the housing. When the annular piston moves in a downward direction, the hydraulic ram moves toward a retracted position retracted within the housing. A polish rod extends up through the central bore of the annular piston and is held in position by a polish rod clamp positioned on top of the hydraulic ram. The polish rod moves with the hydraulic ram. Other pumping systems, devices, and methods are also disclosed.

主权项

1. A pumping assembly comprising:
a well head; a hydraulic pump including: an external housing coupled to the well head; a secondary tube inside the external housing and extending from the bottom toward the top of the external housing; a hydraulic ram tied to an annular piston mounted on the secondary tube inside the external housing to allow the annular piston to move along the secondary tube during operation of the hydraulic pump; a rod disposed in the secondary tube and connected to the hydraulic ram; and a hydraulic chamber that is positioned below the annular piston within the external housing and extends continuously from the secondary tube to the external housing such that hydraulic fluid pumped into the hydraulic chamber during operation urges the annular piston in the upward direction to cause the hydraulic ram to lift the rod and move toward an extended position from the external housing.