组分模型理论基础.ppt

* * * * * * Properties and definition of a Black Oil * Phase Diagram for a Black Oil – showing initial pressure(1), bubble point (2) and abandonment pressure (3) and separator conditions. * Properties and definition of a Volatile Oil * Phase Diagram for a Volatile Oil– showing initial pressure(1), bubble point (2) and abandonment pressure (3) and separator conditions. * Properties and definition of a Gas Condensate * Phase Diagram for a Gas Condensate – showing initial pressure(1), dew point (2) and abandonment pressure (3) and separator conditions. * Interesting plot of Gas-Oil Ratio Vs. C7+ mole % as one goes from a gas to an oil. * Properties and definition of a Wet Gas * Phase Diagram for a Wet Gas – showing initial pressure(1) and abandonment pressure (2) and separator conditions. * Properties and definition of a Dry Gas * * * * * Boyle’s Law is based on observations made around 1660 that for a fixed mass of gas at a fixed temperature, the product of pressure and volume is a constant, i.e.: * Determined P time V = constant * If gas volume is Vo at 0o C get the above equation with slope a. The gradient, a, is found to have the value 1/273, and as a consequence, when T=?273 ?C, the gas volume will become zero. By re-specifying a temperature scale T with the same spacing of degrees as the Centigrade scale, but starting with 0 at 273 ?C the volume/ temperature relationship becomes – see slide * Re-define T to be 0 at absolute zero get above equation. * Over a century later (1787), it was observed that for a fixed mass of gas at constant pressure, the volume varies linearly with temperature, i.e., if the gas had a volume V0 at 0??C, at a temperature T: Viscosity Correlations Cannot predict viscosities from EOS: phase flow property Two most widely used correlations Lohrenz-Bray-Clark (LBC) Pedersen et al Aasberg-Petersen – not yet available in Eclipse Compositional LBC OK for gases and volatile oils, very poor for heavier oils Pedersen better for gases