Technical reference PVT • E02-1
Emeraude V2.42 - © KAPPA Engineering 1994-2005 (Doc V2.42.01 – 02/05)
E02 • PVT
An Emeraude interpretation relies on the definition of a PVT model describing the nature of the flowing
mixture, and giving the associated PVT properties as a function of T and P. Each property is represented by
a user selected Black-Oil correlation, possibly constrained to match some entered measurements. The
flowing mixture is defined as a hydrocarbon model with or without water:
For hydrocarbons involving potentially 2 phases, the PVT model does not pre-suppose the
existence/presence of a given phase at downhole conditions. This is delayed until the actual rate
calculations.
The calculation engine invokes the PVT model dynamically when PVT properties are required, which makes
the PVT model an independent and self-contained component of the interpretation. In the data browser, a
PVT node appears inside an interpretation (once the PVT model has been defined). This node can be copied
from one interpretation to another using drag and drop in the data browser. It can be saved to a file, and
loaded from a file.
E02.1 • Gas PVT
The available correlations for the gas phase are:
Z factor µg ρg
Dranchuk Lee et al. Katz
Beggs and Brill Carr et al.
Hall-Yarborough
Technical reference PVT • E02-2
Emeraude V2.42 - © KAPPA Engineering 1994-2005 (Doc V2.42.01 – 02/05)
E02.2 • Oil PVT
The available oil phase correlations are:
Rs, Pb Bo µo Co
Lasater Standing Beggs & Robinson Vasquez & Beggs
Standing Vasquez & Beggs Beal Petrosky & Farshad
Vasquez & Beggs Glaso Glaso (dead oil)
Glaso volatile Petrosky & Farshad
Lasater-Standing
Petrosky & Farshad
E02.3 • Water PVT
The water phase correlations are:
Bw Cw Muw
Gould Dodson and Standing Van-Wingen + Frick
McCain Osif
A working subset as well as the default for each property can be defined in the Interpretation Settings option.
It is possible to constrain the followings with entered match points: Rsw, Cw, Bw, µw, ρw
E02.4 • Condensate PVT
The Black-Oil condensate model available in Emeraude uses a parabolic relation for the disolved
condensate as a function of pressure. The relation is set from tank and separator conditions. The required
input parameters are:
• Tank gas gravity
• Tank GOR
• Separator gas gravity
• Separator GOR
• Separator P and T
• Dewpoint P and T
• Liquid Gravity
• Sour gas content
The condensate model is based on a special correlation for the vaporized condensate. This correlation is
initialized from the knowledge of the dew point conditions, the separator, and the tank conditions. The tank
values can be calculated automatically using the method after D.K. Gold, W.D. McCain Jr & J.W. Jennings
described in their paper “An improved method for the Determination of the Reservoir-Gas Specific Gravity for
Retrograde Gases”, Journal of Petroleum Technology, July 1989.
