Hydrostatic and oil well pump
A pump is provided for pumping a fluid from a borehole. The pump includes first and second pumping strings extending into the borehole and a return string extending out of the borehole and to a storage tank. An upstroke cylinder is slidably mounted for reciprocation on the first pumping string and a downstroke cylinder is slidably mounted for reciprocation on the second pumping string. A pump barrel is slidably mounted to the return string and forms a pumping chamber. Fluid from the borehole enters the pump chamber through a one-way check valve to equalize the fluid pressures between the pumping chamber and borehole. A pumping fluid is then entered into the first pumping string to urge the upstroke cylinder to the extended position, tensioning a cable to move the pump barrel and downstroke cylinder to the retracted positions pumping the fluid in the pumping chamber up the return string. The pumping fluid at the predetermined pressure is then entered into the second pumping string to move the downstroke cylinder to the extended position, moving the upstroke cylinder to the retracted position. Interconnecting lugs on the downstroke cylinder and pump barrel cause the pump barrel to move to the extended position with the downstroke cylinder.
- Assignee:
- EDB-83-091841
- Patent Number(s):
- US 4373873
- OSTI ID:
- 6291986
- Resource Relation:
- Patent File Date: Filed date 4 May 1981; Other Information: PAT-APPL-259837
- Country of Publication:
- United States
- Language:
- English
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