PVTsim for OLGA
PVTsim by Calsep Calsep a Danish alliance partner Founded in 1982 Specialists in PVT and fluid properties calculations Ensures most updated PVT calculation methods for OLGA users
PVTsim On the market since 1991 Developed for process, reservoir and laboratory engineers More than 200 installations worldwide
PVTsim 15 main window
PVTsim OLGA Version Limited version of full PVTsim package additional modules available through Calsep Use PVTsim to
characterize fluids tune characterized fluid to saturation points mix fluids by volume, by weight or on molar basis do flash calculations calculate phase envelopes calculate various fluid properties make OLGA fluid property tables (.tab files)
Basic Models in PVTsim Equation of state (EOS) Soave-Redlich-Kwong - Peneloux (SRK-P) default EOS Peng-Robinson - Peneloux (PR-P) Soave-Redlich-Kwong (SRK) Peng-Robinson (PR)
Water mixed with hydrate inhibitors EOS with Huron and Vidal (1979) mixing rule
C7+ Characterization Procedure Pedersen et al, 1984 - estimate distributions of mol fraction, density and molecular weight
Based on above estimates Calculate properties of carbon number fractions Tc , Pc ,acentric factor needed by EOS
Group the carbon number fractions TBP-fractions + estimated carbon number fractions of plus fraction into a user defined number of pseudo components (default 12)
Estimate Molar Distribution
Estimate Density Distribution
Estimate Molecular Weight Molecular weight versus carbon number fraction
MWN = 14 CN - 4 MWN : Molecular weight CN : Carbon number fraction
Transport Properties Viscosity Corresponding states principle (CSP) - default method Pedersen et al, 1987 Lohrenz-Bray-Clark (LBC) same 1964 Thermal Conductivity Pedersen et al, 1987
Transport Properties cont. Surface Tension Gas/oil: Weinaug & Katz 1943 Gas/pure water: API Technical databook, 1983 Oil/pure water: API Technical databook, 1983 Gas/salt water & oil/salt water: Firoozabadi & Ramey, 1988
OLGA Tables Content General specification Pressure, temperature, total water mass fraction, gas mass fraction, water vapor fraction of gas,
Physical properties for each phase density density derivatives enthalpy heat capacity entropy viscosity thermal conductivity surface tension
OLGA Tables - Water Flashing Complete three-phase flash is always performed when water and other aqeous components(MeOH, MEG etc.) are present, i.e. full miscibility. For two-phase tables two liquid phases are lumped into one liquid with average fluid properties.
OLGA Tables - Water Flashing cont.
Water properties from EOS Density and viscosity corrected for salts
References
Search in pvtdoc.doc in the PVTsim directory Characterization Pedersen: Ind. Chem. Process Des. Dev., 1984, 163 - 170 Mixing rule Huron, M. J. and Vidal, J.: Fluid Phase Eq. 3, 1979, 255.
Transport properties Weinaug, C. F. and Katz, D. L., Ind. Eng. Chem. 35, 1943, 239. Lohrenz, J.,, Bray, B. G. and Clark, C. R. J. Pet. Technol., Oct. 1964, 1171-1176. Pedersen et al: Chem. Eng. Sci. 42, 1987, 182-186 Pedersen et al: J. Can. Pet. Tech, 1988 Firoozabadi, A. and Ramey, H. J., Journal of Canadian Petroleum Technology 27, 1988, pp. 41-48.
PVTsim - Composition Input
PVTsim - Characterized Fluid
PVTsim - Mixing Fluids
PVTsim - Recombining Fluids
PVTsim - Phase EnvelopeTEST 4 BHS OIL C10+ 6000
5000
Crit P
4000
3000
2000
1000
0 -100 0 100 200 300 400 Temperature/F 500 600 700 800 900
PVTsim - OLGA fluid table file input
Specify a sufficiently wide region of P and T. Account for occasional peak (high and low) values. e.g.Tmin could be -10 C Pmin should be 0.5 Bara
Example
Extract of fluid table
Fluid tables - Check the Results! Check the fluid tables for discontinuities and strange tendencies as function of P and T e.g. Gas mass fraction Densities Derivatives of hydrocarbon liquid density
Check the single phase regions in particular (gas mass fraction equals 0 or 1) Use the plotting facility in the OLGA 5 GUI
OLGA 5 fluid plotting (open a
.tab file)
Densities as function of P at 200 Bara
