Mihaela Gabriela Zecheru, Dan JacoTA, Valentin Balteanu<br>Tracer Tests vs RST Studies in Romanian reservoirs <br><br><br>

Mihaela Gabriela Zecheru, Dan JacoTA, Valentin Balteanu
Tracer Tests vs RST Studies in Romanian reservoirs

Abstract:

The mature oil reservoirs are interesting because of the continuously increasing need for oil and also due to the significant investments implied in discovering new reservoirs. This interest is closely related to accurately knowing the hydrocarbon saturation and its distribution inside the reservoir. There is a series of methods, investigations and tests which allows measuring the residual oil saturation in the reservoir. The geophysical investigations in cased wells and the tracer tests are only two of these methods, frequently used in the case of water injection processes.Likewise, single well chemical tracer test plays an important role to evaluate the efficiency of oil recovery process by determining the amount of oil displaced due to injection of IOR/EOR agent. Thepartition coefficient of chemical tracers, a ratio of chemical tracer concentration in oil to concentration in brine, is a critical parameter for designing a single well chemical tracer test. Brine salinity, oil composition, temperature and sometimes, laboratory procedure for measuring the partition coefficient can directly influence this critical parameter. Results of laboratory test performed for measuring the partition coefficient of the ethyl acetate, under reservoir conditions are discussed in this paper. This paper presents an analysis of the measurements’ results of three SWCTT (Single Well Chemical Tracer Test) tests and three RST (Reservoir Saturation Tool) investigations performed in the same wells, on different structures in Romania, aiming to obtain information about the saturation state of the area around the well bore, as well as a comparative analysis of the results obtained by using these two methods. Keywords: oil saturation, mature oil reservoirs, investigation techniques, SWCTT, RST

Issue: 2016, Volume 67, Issue 12

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