This reference is for an abstract only. A full paper was not submitted for this conference.


The Duri field, in Riau province in central Sumatra, is currently the site of the largest steamflood project in the world. The older steamflood areas are in their mature stages, with majority of pattern experiencing steam breakthrough. This paper will describe the appropriate techniques that were applied in processing and interpretation of the Duri steamflood area by using the enhanced carbon-oxygen log (inelastic mode), sigma log (capture mode),pressure-volume-temperature formation fluid, production, well properties, and core data. These combination data make the interpretation results realistic when compared to reservoir conditions. The enhanced carbon-oxygen processing and interpretation are the key factors needed to improve the reliability of oil saturation results and to improve the accuracy and precision of the results.

The appropriate enhanced carbon-oxygen interpretation techniques that based on carbon oxygen ratio detection and formation fluid information in cased-hole conditions, give several benefits in formation evaluation such as an accurate and precise oil saturation determination, independent of formation water salinity. The sigma interpretation technique gives identification of steam conditions. It also works in high-temperature steam, which presents problems for some other evaluation methods in Duri steamflood area.

The enhanced carbon-oxygen and sigma evaluation is one of the solutions used to optimize the operating strategies for these mature steamflood areas. Updated information about oil saturation and steam indication was obtained for zones within the existing steam flood to determine the economic value/risk of producing bypassed oil, for effective heat management and also to optimize the development of steam flood drilling patterns for the Duri field.

Formation evaluation using enhanced carbon-oxygen technique has been used to improve oil recovery and identify additional oil in place that has not responded to conductive heating.

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