PVTsim Nova 3.0RELEASE HIGHLIGHTS
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
EXTENDED GC ANALYSES
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
Over the years Gas Chromatographs (GC) have advanced. Most PVT laboratories report GC compositions to C36+. The GC technique does however not allow molecular weights and densities to be measured of the individual carbon number fractions. Use of default densities for the carbon number fractions will often create a mismatch with the plus fraction density and that may cause unphysical PVT simulation results.
The new PVTsim Nova GC input not only corrects for the above mentioned mismatch, but also allows the user to input compositional data in the format reported by a PVT lab.
A Carbon Number Distillation (ASTM D2892), also known as a True Boiling Point (TBP) distillation is carried out on a stock tank oil sample, most often taken during a separator test. A TBP analysis has the advantage over a GC analysis that it provides measured molecular weights and densities of the individual carbon number fractions and of the plus fraction. Molecular weights and densities are key parameters in the PVTsim Nova fluid characterization.
The new TBP input in Nova 3 allows the users to directly input measured cumulative weight%’s, distillation cut temperatures, molecular weights and densities of each distillation cut and have that input converted into a mole% composition.
TRUE BOILING POINT (TBP) INPUT
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
CUTPOINTS
C12
Tem
pera
ture
(˚F)
wt% distilled
216.8
196.4
Asphaltene modeling work is often documented through a PT diagram covering a limited temperature area as seen on the left hand plot. A new asphaltene phase tracking option allows the whole asphaltene phase envelope to be plotted. That is useful to check whether the model is physically sound or only matching a few data points measured in a limited temperature range. PVTsim Nova 3 supports cubic equations, PC-SAFT and CPA for asphaltene modeling.
ASPHALTENE PHASE TRACKING
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
JAMALUDDIN 2002
Temperature (˚C)
Pres
sure
(psi
a)
1200
1000
800
600
400
200
00 20 40 60 80 100 120 140 160 180 200 220
Upper Asphaltene Onset Pressure Saturation Pressure Lower Asphaltene Onset Pressure
EXPERIMENTAL BUBBLE POINTS EXPERIMENTAL ASPHALTENE ONSET PRESSURES
JAMALUDDIN 2002
Temperature (˚C)
Pres
sure
(psi
a)
800
700
600
500
400
300
200
100
00 100 200 300 400 500 600 700 800 900
Upper Asphaltene Onset Pressure Saturation Pressure Lower Asphaltene Onset Pressure
EXPERIMENTAL BUBBLE POINTS EXPERIMENTAL ASPHALTENE ONSET PRESSURES
Nova 2
Nova 3
Cubic Plus Association (CPA) was introduced in PVTsim Nova 2. As CPA reduces to the classical cubic EoS in the absence of polar components, it is possible for process and flow assurance engineers to make use of EoS models developed for hydrocarbon reservoir fluids and still use CPA and HV for the fluids with water and hydrate inhibitors added. All the user has to do is to select the polar model of preference on a new Polar Comps drop down menu.
ENHANCED POLAR COMPONENTS HANDLING
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
In Nova 3.0, the user can calculate viscosities of water-in-oil and oil-in-water emulsions. For each input temperature and pressure, viscosities can be calculated for water volume fractions ranging from 0 to 1. The emulsion viscosity may be calculated using the Rønningsen model (default) or the model of Pal and Rhodes.
VISCOSITY OF WATER-OIL EMULSIONS
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
0.00 0.10 0.20 0.30 0.40 0.50 0.70 0.80 0.90 1.00
VISC
OSI
TY (c
P)
WATER VOLUME
EMULSION VISCOSITY AT 60˚C AND 200 BARA
ETHANOL HURON-VIDAL PARAMETERS UPDATED
PVTsim Nova 3.0 uses HV parameters updated based on the measured data from the Dortmund Data Bank.Validation reports available for SRK-HV and PR-HV.
AC
T 8
49
04
PO
INT
S
AC
M 1
56
0 S
ET
S
CR
I 3
193
SE
TS
AZ
D 5
60
88
PO
INT
S
PO
W 1
40
40
CP
E 5
99
0 S
ET
S
EG
LE
25
75
SE
TS
EG
LE
10
84
0 S
ET
S
EC
ND
718
6 S
ET
S
EC
ND
43
59
SE
TS
PO
LY
ME
R 2
00
21
SE
TS
MT
CN
45
41
SE
TS
MS
OS
15
189
SE
TS
MS
FT
49
24
SE
TS
MP
VT
10
84
6 S
ET
S
GH
D 3
26
8 S
ET
SM
FL
P 4
20
SE
TS
VLE36415SETS
HPV38149SETS
HPV52568SETS
VF67423SETS
PCP270475
SETS
PCP VLE: 85404 SETS (VLE+HPV+ELE)
VAPOR (GAS) - LIQUID LIQUID - LIQUID EXCESS ADSORPTION TRANSPORT GAS - HYDRATE
X24166SETS
VIS36240SETS
ESLE38732SETS
HE22469SETS
LLE29489SETS
GLE22355SETS
SOLID - LIQUID
PURE
FURTHERDATA
ELECTROLYTESPOLYMER
FLASH POINTS
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
Taking the Huron Vidal parameter update project further, PVTsim Nova 3.0 will have updated parameters for Ethanol - Cx (x = 1, 2, 3) and Ethanol - H2O. The Ethanol - CO2 parameters were also reviewed and found to be acceptable.
CPA PARAMETERS FOR GLYCOLS & EtOH
The CPA model was introduced in PVTsim Nova 2.0. It has in Nova 3 been extended to also handle MEG, DEG, TEG and EtOH.
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
C O H H
H H
- +
C O H H
H
- +
C H
H H
OH H
-
+
S H H
C OO
C H H
OC H
H O
H H
- -
+ +
C O C H
H
H
H C H
H C H
H O
C H H
OC H
H O
H H
- -
+ +
C H H
OC H
H O
H H
- -
+ +
C O C H
H
H
H
OO O H
H + + -
- O
OH
+ -
O H + -
OO
O H H + + - -
PVTsim Nova 3 can model hydrates formation based on the phase equilibria calculated by the Cubic Plus Association (CPA) equation-of-state. Hydrate inhibition equilibrium can also be modeled by CPA.
CPA FOR HYDRATES
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
Gas Molecules
Water Molecules
ENHANCED ECLIPSE BLACK OIL INTERFACE
Eclipse Black Oil has strict input checks. Bo, Rs, and other black oil properties must be monotonic with pressure. Eclipse Black Oil further checks for negative oil and gas compressibilities (Co and Cg). These are defined in terms of black oil properties and not to be mistaken for isothermal gas and oil compressibilities. PVTsim Nova 3 has enhanced procedures for adjusting black oil properties to comply with the input check in Eclipse Black Oil without sacrificing a physical meaningful fluid description. PVTsim Nova 3 also supports Eclipse Black Oil API vs. Depth.
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
0 100 200 300 400 500 600
Bo
(m3 /
Sm
3 )
Pressure (bara)
PVTO - Bo vs. Pressure1.400
1.350
1.300
1.250
1.200
1.150
1.100
1.050
1.000
0 100 200 300 400 500 600
Oil
Visc
osity
(cP)
Pressure (bara)
PVTO - Oil Viscosity vs. Pressure25.0
20.0
15.0
10.0
5.0
0.0
New interface options for t-NavigatorReservoir Simulator
New interface for UniSim Design Process Simulator
NEW PVTsim Nova INTERFACES
HOUSTON | COPENHAGEN | DUBAI | KUALA LUMPUR
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