National Oilwell Varco, L.p.

Denis J Blaquiere

Tariq Ahmed

A stator for a progressive cavity pump comprises a stator housing having a central axis, a first end, and a second end opposite the first end. In addition, the stator comprises a stator liner disposed within the stator housing. The stator liner has a first end and a second end opposite the first end. The first end of the stator liner is axially spaced from the first end of the stator housing. Further, the stator comprises a tag insert positioned in the stator housing between the first end of the stator housing and the first end of the stator liner. The tag insert has a through passage defining a radially inner surface that includes a tag shoulder.

No-Go tag systems and methods for progressive cavity pumps

A system comprises a progressive cavity pump including a helical rotor disposed within a mating stator. In addition, the system comprises a rod string having a longitudinal axis, a first end, and a second end coupled to the rotor. Further, the system comprises a rotation retarding device coupled to the first end of the rod string, wherein the rotation retarding device retards the rotation of the rod string relative to the stator. Still further, the system comprises a lifting device coupled to the rotation retarding device, wherein the lifting device is operable to apply an axial lifting force to the rotor.

Systems for retarding rod string backspin

A progressive cavity pump system. In an embodiment, the system comprises a tubing string disposed within a borehole. The tubing string including a seating nipple disposed at a predetermined depth in the tubing string. In addition, the system comprises a stator positioned within the tubing string. The stator includes a radially outer housing having an upper end and a lower end, a radially inner liner having a helical-shaped inner surface, a seating mandrel coupled to the upper end of the housing. Further, the system comprises a seal element disposed about the seating mandrel. The seal element forms a static seal with the inner surface of the seating nipple.

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Lloydminster, Canada

Denis J Blaquiere