Duplex hydraulic and air oil well pump
A pump is disclosed for use in pumping a fluid from a borehole to the surface. The pump includes a first and second pumping string extending into the borehole and a return string extending from the borehole. First and second pistons are slidably mounted at the ends of the first and second puming strings within the borehole, respectively for reciprocation between extended and retracted positions. First and second pumping cylinders are secured in fixed relation to the first and second pumping strings so that the first and second pistons are slidable therein. The pistons and pumping cylinders define first and second pumping chambers. Each of the first and second pistons includes a gear rack having teeth meshing with the teeth on a stroke return gear. Introduction of pressurized fluid into one of the pumping strings urges the associated piston into the extended position, pumping fluid within the associated pumping chamber through one of the orifices into a holding chamber and thereafter through a standing valve into the return string. The gear forces the opposite piston toward the retracted position, opening a inlet valve to permit fluid from the borehole to enter the associated pumping chamber. Fluid flow between the two pumping chambers is prevented by a valve ball cooperating with the orifices interconnecting the pumping chambers with the holding chamber.
- Assignee:
- Flying K Equipment System, Inc.
- Patent Number(s):
- US 4427348
- OSTI ID:
- 6927923
- Country of Publication:
- United States
- Language:
- English
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