This paper describes the use of pulsed photoacoustics to measure ppm concentrations of oil in treated/separated water from subsea and downhole separators. The principle of operation and the system for the pulsed photoacoustic Oil-In-Water Monitor (OIWM) prototype is described. Main test results for the prototype sensor are presented, with focus on the impact on measurement by changes in temperature, pressure and salinity. Following, a model used to compensate such variations is shown. The paper finally addresses the implications of using pulsed photoacoustic measurement principle to measure oil entrainment in produced water from subsea and downhole separators.

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