Low profile rod pumping unit with pneumatic counterbalance for the active control of the rod string

摘要

Adaptable systems for a surface pumping unit that includes a low inertia pumping unit mechanism having a pneumatic counterbalance assembly are described, as well as methods for the use of such systems for subterranean fluid recovery. The system is capable of being integrated with well management automation systems, thereby allowing for response to active control commands, and automatically altering and/or maintaining a counterbalance force in the pumping unit by adding or removing air mass from a containment vessel associated with the pumping unit.

主权项

1. A device for actuating a rod of a sucker rod pump assembly, the device comprising:
a motor; a linear actuator assembly operatively connected to the motor, wherein the linear actuator assembly is not a fixed geometry linkage system; and a counterbalance assembly operatively connected to the linear actuator assembly capable of alleviating a load imposed on the linear actuator assembly by the rod and a column of a first fluid to be pumped, wherein the counterbalance assembly includes a containment vessel.