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  • Downhole desander prevents ESP damage in high-watercut well


    S. Coffee and M. Briffett

    A field test in Canada demonstrated the effectiveness of a downhole desander to protect Electric Submersible Pumps (ESPs) from failure caused by the production of formation sand. An abrasive environment can cause radial wear of the pump bearings leading to vibration, which often results in equalizer and motor failure. Erosion of diffusers and impellers also reduces the efficiency of the pump, resulting in less than optimal production. Renaissance Energy tested the desander as part of its efforts to reduce operating costs, 24% of which it attributed to well workovers and related servicing costs. High-volume lift systems and sand production were the dominant factors contributing to these high costs. BACKGROUND Renaissance, which was purchased by Husky Energy after this study, identified its Cantuar Unit in southwestern Saskatchewan as one of its critical areas for cost reduction. In this unit, the producing reservoir is fine- to medium-grained quartz arenite...

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