PVT EXPERIMENTS
View: Process Flow Diagram
View: Simulation Results
XPSIM provides the possibility of simulating a number of laboratory experiments that are usually carried out on samples of reservoir fluids for the characterization of the heavy hydrocarbon fraction.
Since these experiments are based on the measure of pressure, volume and temperature (PVT) of a fluid sample they are usually defined as PVT ANALYSIS.
Using this feature it is possible to simulate four experiments that are usually carried out on samples of reservoir fluids.
The experiments simulated are:
|
Experiment |
Keyword |
|
Constant composition expansion |
CCE |
|
Constant volume depletion |
CVD |
|
Differential liberation |
DIFF |
|
Swelling test |
SWELL |
|
Test separations |
SEP |
that are usually performed at the well head pressure, atmospheric pressure and other intermediate values.
The user may specify any number of experiments and for each experiment an unlimited number of data points may be supplied. For each experiment the initial fluid composition must be specified.
All the experiments are performed at constant temperature. In some experiments, the total composition varies due to the liberation of the gas initially dissolved in the sample.
At each point the liquid and vapor volumes, gas and oil densities and eventually the liquid and gas viscosities are measured. In certain cases the liquid and vapor phases are analyzed and their compositions reported.
In the following example 3 experiments are performed:
CCE (Constant Composition Expansion)
CVD (Constant Volume Depletion)
SEP (Test separation)
The aim of the calculation is to verify the characterization of heavy components and the interaction coefficients supplied for the SRK (Soave-Redlich-Kwong) and PR (Peng-Robinson) equation of state
In the process flow diagram some dew-point, flash and phase-envelope calculations are used to test the reservoir composition (stream WEST).
<XPSIM> ...generated by XpsimWin v.1.06 ...
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RUN ID=PVT05A CUSTOMER=STAFF PROJECT='NORTH AFRICA RESERVOIR'
DESC PVT EXPERIMENTS FOR OIL CHARACTERIZATION
DESC PRELIMINARY STUDY REQUIRED FOR
DESC GATHERING SYSTEM HYDRAULIC STUDY - 24/09/2002
DIMENSION INPUT SI PRES=BAR STDVAP=23.69 RTEMP=15.5 RPRES=1
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Petroleum Data
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HYPO ID=C5+ NAME=C5+ SPGR=.637 MW=71.97 / ID=C6+ NAME=C6+ SPGR=.707 +
MW=84.77 / ID=C7+ NAME=C7+ SPGR=.736 MW=98.27 / ID=C8+ NAME=C8+ +
SPGR=.752 MW=112.09 / ID=C9+ NAME=C9+ SPGR=.767 MW=125.51 / ID=C10+ +
NAME=C10+ SPGR=.761 MW=140.27 / ID=C11+ NAME=C11+ SPGR=.756 +
MW=155.54 TCRIT=370 PCRIT=21.2 / ID=C12+ NAME=C12+ SPGR=.826 +
MW=198.68 TCRIT=425 PCRIT=19.87
CALC CRIT=CAVETT
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Thermodynamic Data
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METHOD METHOD=SRK
BINARY=C1,C5+ KIJ=0.05,,,,,,,,,,,,,,,,,,,
BINARY=C1,C6+ KIJ=0.03,,,,,,,,,,,,,,,,,,,
BINARY=C1,C7+ KIJ=0.015,,,,,,,,,,,,,,,,,,,
BINARY=C1,C8+ KIJ=0.055,,,,,,,,,,,,,,,,,,,
BINARY=C1,C9+ KIJ=0.07,,,,,,,,,,,,,,,,,,,
BINARY=C1,C10+ KIJ=0.08,,,,,,,,,,,,,,,,,,,
BINARY=C1,C11+ KIJ=0.12
BINARY=C1,C12+ KIJ=0.15
METHOD METHOD=PR
BINARY=C1,C5+ KIJ=0.05,,,,,,,,,,,,,,,,,,,
BINARY=C1,C6+ KIJ=0.03,,,,,,,,,,,,,,,,,,,
BINARY=C1,C7+ KIJ=0.015,,,,,,,,,,,,,,,,,,,
BINARY=C1,C8+ KIJ=0.055,,,,,,,,,,,,,,,,,,,
BINARY=C1,C9+ KIJ=0.07,,,,,,,,,,,,,,,,,,,
BINARY=C1,C10+ KIJ=0.10,,,,,,,,,,,,,,,,,,,
BINARY=C1,C11+ KIJ=0.17
BINARY=C1,C12+ KIJ=0.22
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System Data
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CHEMCOMP H2O / H2S / N2 / CO2 / C1 / C2 / C3 / IC4 / NC4
THERMSET UID=SETF
WOPT K=2
METHODS K=SRK HS=LK CP=IDEAL DV=LK DL=SRK-P IV=LK VIS=IDEAL THC=IDEAL +
SURT=IDEAL
PRINT PETRO METHOD
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PVT Analysis
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STREAM=OIL1
COMP H2O:0 / H2S:0.37 / N2:6.13 / CO2:15.56 / C1:65.85 / C2:4.40 / +
C3:2.18 / IC4:0.56 / NC4:0.95 / C5+:1.03 / C6+:0.66 / C7+:0.65 / +
C8+:0.53 / C9+:0.37 / C10+:0.26 / C11+:0.17 / C12+:0.33
CCE TEMP(CENT)=140 REFSTR=OIL1 DENS=1000 UID=CCE1
DATA PRES=310.3 RV=0.8538 LVF=0.0000 Z=0.980
DATA PRES=303.4 RV=0.8681 LVF=0.0000 Z=0.974
DATA PRES=298.2 RV=0.8792 LVF=0.0000 Z=0.970
DATA PRES=293.5 RV=0.8900 LVF=0.0000 Z=0.966
DATA PRES=288.7 RV=0.9014 LVF=0.0000 Z=0.962
DATA PRES=282.6 RV=0.9167 LVF=0.0000 Z=0.958
DATA PRES=275.9 RV=0.9347 LVF=0.0000 Z=0.954
DATA PRES=270.3 RV=0.9503 LVF=0.0000 Z=0.950
DATA PRES=262.0 RV=0.9755 LVF=0.0000 Z=0.945
DATA PRES=254.4 RV=1.0000 LVF=0.0000 Z=0.941
DATA PRES=248.6 RV=1.0203 LVF=0.00056
DATA PRES=240.6 RV=1.0500 LVF=0.00139
DATA PRES=228.9 RV=1.0979 LVF=0.00268
DATA PRES=215.5 RV=1.1597 LVF=0.00429
DATA PRES=191.0 RV=1.2982 LVF=0.00750
DATA PRES=160.6 RV=1.5404 LVF=0.01079
DATA PRES=123.1 RV=2.0188 LVF=0.01342
DATA PRES=100.8 RV=2.4827 LVF=0.01423
DATA PRES=80.6 RV=3.1345 LVF=0.01439
DATA PRES=59.0 RV=4.3389 LVF=0.01392
CVD TEMP(CENT)=140 REFSTR=OIL1 UID=CVD1
DATA PRES=254.4 RV=0.0000 LVF=0.0000 Z=0.941
DATA PRES=247.9 RV=0.0208 LVF=0.00042 Z=0.919
DATA PRES=237.2 RV=0.0590 LVF=0.00167 Z=0.913
DATA PRES=212.7 RV=0.1483 LVF=0.00432 Z=0.902
DATA PRES=185.2 RV=0.2542 LVF=0.00771 Z=0.893
DATA PRES=153.1 RV=0.3834 LVF=0.01009 Z=0.885
DATA PRES=118.2 RV=0.5285 LVF=0.01167 Z=0.881
DATA PRES=79.8 RV=0.6878 LVF=0.01143 Z=0.882
DATA PRES=38.2 RV=0.8484 LVF=0.01080 Z=0.893
SEP REFSTR=OIL1 STOD=759 GG=1.268 GOR=1000 UID=SEP1
DATA TEMP(K)=307.6 PRES=37.6
LCOMP H2O:0 / H2S:0.20 / N2:0.24 / CO2:4.95 / C1:10.24 / C2:3.15 / +
C3:4.42 / IC4:2.00 / NC4:6.01 / C5+:11.59 / C6+:10.54 / C7+:11.74 / +
C8+:10.63 / C9+:7.90 / C10+:5.60 / C11+:3.67 / C12+:7.13
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Flowsheet Data
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EQUI 3PHASE LLSM=LHLW KEY1=H2O
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STREAM=WEST TEMP=40.55 PRES=172.8 RATE(M)=100 NORM XBASIS=M
COMP H2O:0 / H2S:0.37 / N2:6.13 / CO2:15.56 / C1:65.85 / C2:4.40 / +
C3:2.18 / IC4:0.56 / NC4:0.95 / C5+:1.03 / C6+:0.66 / C7+:0.65 / +
C8+:0.53 / C9+:0.37 / C10+:0.26 / C11+:0.17 / C12+:0.33
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PHASENV IN WEST UID=PHASE1
CALC PMAX=400
PRINT PLOT
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FLASH IN WEST OUT GASA0065(V) LIQA0065(L) UID=CYLIND
CALC ISO TEMP=34.4 PRES=37.6
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FLASH IN LIQA0065 OUT SGS03(V) STDLIQ(L) UID=STD
CALC ISO TEMP=15.56 PRES=1.013
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FLASH IN GASA0065 SGS03 OUT STDGAS UID=RECOMB
CALC ISO TEMP=15.56 PRES=1.013
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FLASH IN WEST OUT DEW UID=DEW
CALC DEW TEMP=140.55 PEST=250
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VLE Analysis
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VLECURVE STR=WEST
CALC ISO TEMP=140.5 PRES=100,300 POINTS=11
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Output Data
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PRINT FORMAT=2 MFRAC
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END