Patent ID: 9033058
Filing Date: 2015-05-19
Classification: E21B,F04C

Abstract:
1. A progressive cavity pumping system for pumping a fluid from a wellbore, comprising: a tubing string extending into the wellbore; a stator coupled to the tubing string, wherein the stator has a central axis, an upper end, and a lower end opposite the upper end; wherein the stator includes a stator housing and a stator liner disposed within the stator housing; wherein the stator liner extends along the central axis from a first end proximal the upper end of the stator housing and a second end distal the upper end of the stator housing, and wherein the stator liner includes a helical passage extending from the first end of the stator liner to the second end of the stator liner; a rod string extending through the tubing string; a helical rotor extending axially into the through passage of the stator liner, wherein the rotor has a first end coupled to a lower end of the rod string and a second end distal the rod string; and a tag insert positioned in the stator housing between the upper end of the stator housing and the first end of the stator liner, wherein the tag insert comprises a through passage including a tag shoulder; wherein the rotor extends axially through the passage of the tag insert, and wherein the tag shoulder is adapted to restrict the first end of the rotor from passing axially into the stator liner; wherein the tag insert has a central axis coaxially aligned with the central axis of the stator housing, a first end proximal the first end of the stator housing and a second end proximal the first end of the stator liner, the through passage of the tag insert extending axially from the first end of the tag insert to the second end of the tag insert; and wherein the passage in the tag insert includes a helical portion axially positioned between the second end of the tag insert and the tag shoulder.