This paper presents the results of a field trial conducted in Saskatchewan, Canada to investigate drive string dynamics between conventional and continuous rod and the impact of interference fit between rotor and stator in progressing cavity pumps (PCP).

In August 2009, a well was completed with a downhole monitoring system and a PCP driven by a continuous rod string. At the same time, a second well was completed with a downhole monitoring system and a PCP driven by a conventional rod string. The pumps were identical with the exception of the interference fit of the rotor in the elastomeric stator.

Thousands of data values were collected over a period of several months and evaluated to better understand rod stretch, torsion, and axial movement during start-up, shut-down and normal operating conditions and how these values change as a function of the interference fit of the pump itself. While the data evaluation did provide answers to help ConocoPhillips improve their PCP operations, there were even more questions generated that will prove thought-provoking to the industry and stir some great discussion.

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