Baker Hughes Corporation

Douglas W Berry

Bruce Erwin Proctor

Nicholas Daniel Johnson

Kelley L Phillips

A tandem progressive cavity pump system lifts well fluids from a production zone to a well surface. The system provides a first pump and a second pump. The system positions the first pump at the production elevation within the well, and the second pump at an intermediate elevation within the well. The system then connects a discharge of the first pump to an intake of the second pump. The system is then operated so that the first pump lifts well fluids from the production zone to the intermediate zone, depositing the well fluids in the intake of the second pump. The second pump then lifts the well fluids from the intermediate zone to the surface of the well.

Tandem progressive cavity pumps

The bottom tag of the present invention comprises a tapered coupling that is secured below the stator housing. In one embodiment the smaller diameter of the coupling is smaller than the rotor minor diameter. In another embodiment the smallest diameter in the coupling tag is smaller than the major diameter of the rotor and longer than one half the rotor pitch, so that no more than one half of a rotor pitch can enter. In either case there are optional side openings to aid flow during operation. The taper in the coupling tag guides coiled tubing through when the rotor is removed to clean up the wellbore below by jetting through the coiled tubing. The taper can also guide measurement equipment through.

Bottom tag for progressing cavity pump rotor with coiled tubing access

A progressing cavity well pump system has a stator secured to a string of tubing. A drive head at the surface rotates the tubing and the stator. The pump rotor is held against rotation by an anchor mechanism. The tubing, stator, rotor and anchor mechanism are installed in the well in a single trip.

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Broken Arrow, OK, United States of America

Douglas W Berry