Retrievable downhole pumping system

Wells – Processes – Producing the well

Reexamination Certificate

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Details

C166S377000, C166S068500, C166S105000, C417S360000

Reexamination Certificate

active

11248090

ABSTRACT:
A pumping system10is provided for pumping fluid from a downhole well to the surface through a production tubing string well. A rotatable drive rod18extends from the surface to power the downhole pump, and includes a plurality of rod couplings. The downhole pump includes a pump stator22and a rotor24rotatable within the pump stator. A lifting member36provided at the upper end of the stator is engaged by a drive coupling34to retrieve the pump from the well. The lifting member has an internal shoulder44tapered radially inwardly and upwardly, such that a rod coupling engages the internal shoulder and passes through the lifting member as the rotor is pulled upward.

REFERENCES:
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patent: 5143153 (1992-09-01), Bach et al.
patent: 5871051 (1999-02-01), Mann
patent: 5954483 (1999-09-01), Tetzlaff
patent: 6089832 (2000-07-01), Patterson
patent: 6675902 (2004-01-01), Rowan et al.
patent: 6695060 (2004-02-01), Guidry, Jr. et al.
patent: 6881045 (2005-04-01), Zitka et al.
patent: 6981045 (2005-12-01), Brooks
patent: 2003/0111221 (2003-06-01), Hill et al.

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