Side entry down hole pump for oil wells
A submersible pump is described for pumping fluid from an oil well, the pump comprising: a pump barrel in the well having a closed bottom end and a side surface provided with a fluid inlet port spaced above the bottom end but located below the level of the fluid in the well, the pump barrel defining a pump chamber therein between the bottom end and the inlet port; a pump element received in the barrel for reciprocating movement carrying the pump element past the inlet port during upstrokes and downstrokes of the pumping element, the pump element presenting a flow passage having an inlet for receiving fluid from the pump chamber; seal means on the pump element for sealing same to the pump barrel, the seal means being located above the inlet port in an open position of the pump to admit fluid through the port and into the pump chamber under the influence of gravity. The seal means is located below the inlet port in a closed position of the pump to seal the pump chamber from the port and apply pressure to the fluid in the chamber during downstrokes of the pump element therein; a pumping string connected to the pump element for effecting reciprocation of same in the barrel, the pumping string presenting a flow channel communicating with the flow passage to deliver fluid to the surface of the well during downstrokes of the pump element in the flow chamber; a check valve between the flow passage and flow channel permitting fluid flow upwardly therebetween but preventing fluid flow downwardly therebetween; and a fluid discharge port in the side of the pump barrel at a location above the inlet port and above the seal means in all positions thereof for discharging from the pump barrel fluid trapped above the seal means.
- Assignee:
- NOV; NOV-87-041322; EDB-87-043401
- Patent Number(s):
- US 4632647
- OSTI ID:
- 7187291
- Resource Relation:
- Patent File Date: Filed date 3 Jun 1985
- Country of Publication:
- United States
- Language:
- English
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