Hydraulic oil well pumping apparatus
AssigneeLufkin Industries, Inc.
InventorsKenneth H. VINCENT, Joel LASSEIGNE
Life of this patent
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Abstract
A hydraulic oil well pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. In one embodiment, a time delay halts the movement of the sucker rod or pumping string to allow accumulation of oil in a slow following well. In another embodiment, the pumping string rapidly falls to the bottom of the stroke in order to shake or jar debris from the string.
Claims20
A hydraulic oil well pumping apparatus, comprising:
- a) a hydraulic cylinder having a rod that is movable between an upper rod position and a lower rod position;
- b) a control system that controls movement of the rod as it moves between the upper and lower rod positions;
- and
- c) wherein the control system includes a cleaning cycle, wherein the rod falls from the upper to the lower rod position without choking until the lower rod position is detected and the rod is jarred by the control system abruptly choking flow when the rod reaches the lower rod position.
A method of controlling a hydraulic oil well pumping apparatus, the method comprising:
- a) providing a hydraulic cylinder having a rod that is movable between an upper rod position and a lower rod position;
- b) providing a control system that controls movement of the rod as it moves between the upper and lower rod positions;
- c) allowing the rod to fall from the upper to the lower rod position without slowing until the lower rod position is detected;
- and
- d) abruptly stopping the rod when it reaches the lower rod position so that the rod is jarred to provide a cleaning cycle.
A storage medium readable by a machine tangibly embodying a set of instructions for controlling a well pumping apparatus, the instructions for configuring the machine to permit:
- user enablement of a cleaning cycle,
- wherein when the machine is used to control the well pumping apparatus,
- the machine controls the pumping apparatus to permit the rod to fall from an upper rod position to a lower rod position in such a manner that pumping apparatus is jarred when the rod reaches the lower rod position.
Dependencies are inferred from the claim text.