... Abstract Field data for the compositional variation with depth in five petroleum reservoirs have been analyzed including one rich in asphaltenes with a very high compositional gradient. The data follows the well-known pattern with an increasing concentration of heavy components with depth...

... samples based on lab adjustments along with saturation pressure and reservoir pressure comparison and apply the compositional gradient approach on the most representative dataset. Finally, a common EOS model for the field was developed, tuned, and validated through quality checks by a simulation model...

... below. Only part of the compositional variation can be explained by gravity segregation. A temperature increase with depth also contributes to the compositional gradient. While the theory behind gravity segregation is well established, there is more uncertainty about the influence of a thermal...

... Abstract Phase behavior of a highly rich gas condensate reservoir, especially near critical one, is very difficult to predict. Presence of compositional gradient in these reservoirs further adds to the complexity. In these circumstances, it is very important that precise and detailed field...

... … , N where J i is the mass flux of component i . The superscripts Chem, Gr, Therm and Press stand for the fluxes due to chemical, gravitational, thermal, and pressure forces, respectively. To calculate compositional gradients with depth in a hydrocarbon reservoir using cubic EOS...

... Downhole Fluid Analyzer (DFA), and then to use the DFA measurement as well as the available PVT data from nearby wells to understand reservoir connectivity through the use of a compositional gradient concept. Reservoir fluids that deviated from the compositional gradient were considered...

... analysis (DFA) is an essential tool for determination of the compositional gradients in real time at reservoir conditions. However, analysis of flow connectivity in the reservoir by DFA can be complex, especially when the reservoir fluid compositional gradients are small with depth. In this case...

... , and Kabir, 2006 ) that have dealt with complex fluid columns showing compositional gradients for columns in thermodynamic equilibrium or under steady state conditions. Montel et al. (2002) discuss processes that arise from recent charging of these reservoirs, which are not in equilibrium but still...

... compressibility viscosity density sensor compositional gradient filtrate prediction density measurement fluid density live fluid density pressure gradient reservoir Exhibition application resistivity gradient fluid sample sensor contamination Introduction Precise fluid characterization...

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... of the compositional gradient are developed, the engineer can proceed using either black oil or compositional model to match the history and predict the performance of the reservoir under the acting drive mechanism. nuk ss prediction compositional variation valid sample field case pvt measurement reservoir...

... is particularly important because it enables operators to make sampling decisions based on real-time fluid analysis results rather than a predetermined job plan. wavelength fluid analysis spectroscopy hydrocarbon compositional gradient gradient laboratory analysis analyzer well logging spe 89704...

... variation simulation enthalpy segregate fluid modeling concentration coefficient specific enthalpy compositional gradient expression upstream oil & gas ga enthalpy Introduction For an isothermal reservoir the following equilibrium relation 1 will apply between component i in depth...

... is an important challenge for the petroleum industry. There are already a number of tools available for calculating the compositional gradient within a reservoir, including the contribution of gravity and thermal gradient. In many field cases, the actual profile differs from the one calculated. The discrepancies...

... Abstract Several factors, such as gravity, temperature, type of reservoir fluid, geological structure, accumulation process, etc., may have important effects on the spatial compositional variation of hydrocarbon fluids in reservoirs. Compositional gradients, which may be considerable in near...

.... This involves the synthesis of measured sample data and theoretical models. Specific recommendations are given for interpolation and extrapolation of vertical compositional gradients. The importance of dewpoint on the estimation of a gas-oil contact is emphasized, particularly for newly-discovered reservoirs...

... a Gulf of Mexico field, Bullwinkle J2-RB sand, exhibiting compositional gradients was segregated in the centrifuge. Experimental results from the centrifuge were similar to field values indicating that the large variation in composition observed for this field may be attributed to gravitational...

... reservoir fluid composition is either constant with depth or exhibits a vertical compositional gradient. Scenarios both with saturated and undersaturated GOC are considered. The reservoir performance for the two PVT models is also compared for different permeability distributions. Reservoir simulation...