Using equation of state (EOS) to enhance characterisation of petroleum reservoir fluids with complex behaviours
For oil fields with complex fluid dynamics, to accurately simulate the oil and gas properties under pressure-volume-temperature (PVT) conditions it is often necessary to compartmentalise into sub-regions, collect and analyse many more fluid samples (in fact, in each hydrodynamic zone there must be at least one well to be sampled). However, the results are still not entirely correct. In addition, the level of detail is limited by a finite number of sub-regions while spatially, the fluid PVT properties of the reservoir change continuously. The paper presents the application of EOS in thermodynamic equilibrium in order to provide an effective method for modelling the fluid properties for each specific location in space (continuous variation) from Hamra reservoir in Touggourt, Sahara desert. Thus, it is possible to simulate the continuously variable fluid properties, minimise the need to carry out the collection and analysis of additional fluid samples and reduce costs.
Tarek Ahmed, Equation of state and PVT analysis: Application for improved reservoir modeling. Gulf Publishing Company, 2007.
Curtis H. Whitson and Michael R. Brule, Phase behavior. SPE Monograph Series, 2000.
Hanafy Hussein and Ismail Shaban Mahgoub, “Methodology of investgatin the commpositional gradient within the hydrocarbon column”, SPE Annual Technical Conference and Exhibition, Dallas, Texas, October 2005. DOI: 10.2118/95760-MS.
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