Patent ID: 7419007
Filing Date: 2008-09-02
Classification: E21B,F04C

Abstract:
1. A pumping system for pumping fluid from the downhole well to the surface through a production tubing string using a downhole pump retrievable to the surface without retrieving the production tubing string, the system comprising: a landing nipple positioned at a lower end of the production tubing string; a rotatable drive rod extending from the surface to power the downhole pump, the drive rod including a plurality of rod couplings; the downhole pump including a pump stator and a rotor rotatable within the pump stator along a pump axis to pump fluid; a connector for releasably connecting the pump housing and the landing nipple; a drive coupling for interconnecting the drive rod with the rotor; a lifting member supported on the pump housing for engagement with the drive coupling to retrieve the pump from the well; and the lifting member having an internal shoulder tapered radially inwardly and upwardly relative to the pump axis, an upper shoulder tapered radially inwardly and downwardly relative to the pump axis, and a throughbore radially inward of the internal shoulder for passing a rod coupling from below to above the lifting member, such that the rod coupling above the drive coupling and below the internal shoulder engages the internal shoulder as the rotor is pulled upward to pass the rod coupling above the lifting member and raise the pump rotor above the pump stator, and a rod coupling above the lifting member engages the upper shoulder as the rotor is lowered toward the landing nipple.