Evaluation of Mathematical Models of PVT Properties for Nigerian Crude Oils
- Yisa A. Adeeyo (Universiti Teknologi Petronas) | Muhammad A. Marhoun (Restec)
- Document ID
- Society of Petroleum Engineers
- SPE Nigeria Annual International Conference and Exhibition, 5-7 August, Lagos, Nigeria
- Publication Date
- Document Type
- Conference Paper
- 2013. Society of Petroleum Engineers
- 4.2 Pipelines, Flowlines and Risers, 5.7 Reserves Evaluation, 4.3 Flow Assurance, 2 Well Completion, 5.2.1 Phase Behavior and PVT Measurements, 5.5 Reservoir Simulation, 5.2 Reservoir Fluid Dynamics, 5.6.4 Drillstem/Well Testing
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Reservoir fluid properties data are very important in reservoir engineering computations such as material balance calculations, well testing, reserve estimates, and numerical reservoir simulations. Ideally, those data should be obtained experimentally. On some occasions, these data are not available or reliable; then, empirically derived correlations are used to predict PVT properties. However, the success of such correlations in predicting the properties depends mainly on the range of data with which they were originally developed. A review of the frequently used correlations, along with the statistical accuracy of these correlations when compared to Nigerian data, is the focus of this paper.
More than 2500 unpublished PVT data sets from different locations in Nigeria were acquired for the evaluation of the most frequently used pressure-volume-temperature (PVT) empirical correlation for Nigeria data crude oil samples. The best available correlations were selected by comparison with a large database of reservoir-fluid studies of samples collected from different locations in Nigeria. The comparison is based on statistical error analysis. This paper gives the best correlations for field applications for estimating bubblepoint pressure, solution gas-oil ratio and oil formation volume factor at bubble point pressure.
The results of this study show that the present practice of arbitrarily choosing any correlations for bubblepoint pressure (Pb), Solution gas-oil ratio (Rs) and formation volume factor at bubblepoint (Bob) estimation is not the optimum.
Pressure-Volume Temperature (PVT) analysis is the study of the changes in volume of a fluid(s) as function of pressure and temperature. The essence of PVT analysis is to simulate what takes place in the reservoir and at the surface during production and to provide vital information about physical and thermodynamic behavior of the reservoir fluids. An accurate understanding of reservoir fluid PVT properties forms the basis of reservoir simulations, recovery estimates, well completion and facility design decisions, pipeline flow assurance choices, production optimization strategies. The PVT data analysis is often used in predicting future performance, design of experiments and fluid handling equipment, calculation of oil and gas recovery, design of future EOR schemes and optimum design of production and surface facilities. The calculation of reserves in an oil reservoir and the determination of its performance and economics require a good knowledge of the fluids' physical properties.
|File Size||354 KB||Number of Pages||14|