As water production in mature oil fields continues to increase, we as an industry are continually challenged with how to handle the ever-increasing volumes of produced water. Downhole separation is attractive but needs further investigation about oil in water content after separation and its effect on formation damage of injection zone This paper is a description of field testing of Down hole Oil/Water Separation technology in well LA 90, Lacq Superieur field, SW France where oil and water streams are separately produced to surface in order to control fluids quality

The deviated well produces an heavy oil with high water cut from a carbonate reservoir. The new well completion consists of a hydrocyclone for oil/water separation and of electric submersible pump. The system can handle a flow rate from 150 to 270 m3/d with a water cut of about 97%. All parameters including the two well head string pressures, flow rate and pump speed were investigated during the flowing periods. Water cut, oil in water and droplet size were measured

Issues revolving around the quality of produced fluids are reviewed and preliminary results from the field trial are presented, specially the remaining oil in the water stream The improved knowledge of emulsion characterization leads to a better use of downhole separation system and a more accurate prediction of formation damage in the injection zone

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