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Tech Report: Elastomer Change Increases Pump Run Life More Than 8-Fold in High-GOR Well

PCP with constant-thickness elastomer also reduces workover costs by 65% for a Petrolera Sinovensa oil well in Venezuela

Elastomer Change Increases Pump Run Life More Than 8-Fold in High-GOR Well

Publication Date: 01/11/2017

Petrolera Sinovensa operates a number of wells in the Orinoco belt of eastern Venezuela. From 2012 to 2013, the progressing cavity pump (PCP) failure rate increased with field GOR. Engineering analysis determined that the most common failures were hysteresis, explosive decompression, and elastomer debonding—all common problems when gas causes pump elastomers to swell unevenly, creating stress sites that can lead to failure. In one well, pump run life was just 79 days before failure.

The high-GOR well with the 79-day pump lifetime was chosen for a field trial of the KUDU 75 K 1500 EW pump with constant-thickness elastomer. The pump survived a remarkable 675 days under the same conditions, an increase of more than 8.5 times over the conventional technology. The pump’s reliability also reduced workover costs by 65% and eliminated deferred production from the well during its extended lifetime.




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