1887

Abstract

Summary

Recent advances of tracer technology have induced a step-change in surveillance opportunities for EOR and IOR projects. Two particularly interesting methodologies, both targeting assessment of how remaining oil saturation can be minimized, are the partitioning inter-well tracer test (PITT) and the single-well chemical tracer test (SWCTT). Upon completion of a SWCTT or a PITT, the remaining oil saturation (ROS) can be estimated from this time-lag and the partitioning coefficient, through a simple relation. Regarding PITTs, new and stable, oil-water partitioning tracers were developed and has now matured into a well-established methodology applicable for a wide range of reservoir conditions. For SWCTTs, new and significantly improved tracers were recently applied in the field and pilot testing demonstrated that required tracer amounts are reduced from tonnes to grams. The reduction in required tracer amounts solves several operational and logistical issues. It also allow for injection of several tracers simultaneously, without compromising the chemical composition of the reservoir fluids. The tracers can be designed to span a wide range of partitioning coefficients. By analysis of interpretation of the production curves from the individual partitioning tracers, an in-situ assessment of fractional flow and how EOR chemicals can affect this fractional flow, can be made.

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2017-04-24
2021-01-27
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