Category: Monthly Articles

Gridding in Reservoir Simulation

Author: Ilina Yusra One of the key questions that reservoir engineers come across in their work is how to determine the minimum number of grid blocks required in a reservoir model. Whether it is a full-field model or a simpler model, determining the number of grid blocks needed is not necessarily trivial, and failing in […]

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Global Component Lumping for EOS Calculations

Author: Ahmad Alavian Did you develop a detailed equation of state (EOS) model and you do not know how to lump the components? Here is how we do it! The EOS model must provide an accurate prediction of phase and volumetric behavior of relevant mixtures flowing through a given system being modeled. Properties of density, […]

Monthly Articles, News

Estimating In-Situ Reservoir Fluid Compositions

Author: Markus Hays Nielsen Having a good estimate for the in-situ fluid composition is crucial for modeling and forecasting surface gas and oil rate (GOR) behavior, resulting in enhanced reserves estimation. Moreover, if we have in-situ compositions for all wells, it is possible to generate a compositional map which can be used for optimizing the […]

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Consistent Fluid Management from Reservoir to Sales

Author: Mathias Lia Carlsen PVT and fluid characterization are fascinating! Unlike other parameters needed for petroleum engineering calculations, PVT properties have an impact on essentially every discipline in the petroleum domain. Just think about it: whether you do engineering related to reservoir, production, pipeline, facility or process you need PVT. Even geologists need PVT to […]

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Ensuring Consistent EOS Model Transfer from one PVT Package to Another

Author: Bilal Younus There are many commercial PVT packages in the oil and gas industry (e.g. PhazeComp, PVTi, PVTp, PVTSim, WinProp, PVTx). These PVT packages are either used for EOS model development or leverage an existing EOS model for different engineering applications or both. Occasionally, an EOS model is developed in a different (external) PVT […]

Monthly Articles, News

ASTM D2892 Data for Better C7+ Characterization in EOS Modelling

Author: Bilal Younus An EOS model requires five properties for each component in a mixture: critical pressure (pc), critical temperature (Tc), acentric factor (ω), molecular weight (M) and volume shift (s). The three first properties define the vapor pressure curve of the component, and the last two properties (parameter) ensures accurate prediction of liquid density […]

Practical Aspects of EOS Treatment in Compositional Simulators

Author: Stian Mydland When running compositional reservoir simulations, it is always good practice to quality check that the equation of state (EOS) model developed in a standalone PVT package is exported correctly to the simulator. This is achieved by taking the fluid related output from e.g. CMG GEM, Eclipse 300, or Sensor, and compare it […]