simulator
DESCRIPTION
Initial Condition for simulatorTRANSCRIPT
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Initial Condition
P(x,0) = Pi
x
y
z
For simulation)
oz
k,j,iz(
op
n
k,j,ip
Po @ zo
Zo – datum depthPo – initial pressure at datum depth
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Initial Condition
x
y
z
Initialization in Simulator
1. Direct input into each gridblock
Use keywords (for black oil):PRESSURESWATSGASRS or PBUB
Gas
oil
Wtr
![Page 3: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/3.jpg)
Initial Condition
x
y
z
How initialize phase pressures and saturations; i.e., oil, gas, water?
Initialization in Simulator2. Calculated by equilibration - initial conditions determined on the basis of
hydrostatic equilibrium (EQUIL)
Data requirementsa. Pressure at datum depthb. Gas-oil and water-oil contactsc. Capillary pressure at each contactd. Rs or Pb optional as f(D)
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Initial Condition
Sw P P
pw (also po, pg)
po (also pw, pg)
pg (also po, pw)
z
pw
pw
pw
po (also pg)
po (also pg)
po
pg
Oil+Wtr pcow0
Water
Gas
OIL
0pcog
zones
A
B
C
D
E
VerticalSaturationdistribution
VerticalPhase pressure
DistributionsIncluding Pc
VerticalPhase pressure
Distributionsneglecting Pc
Gas+Oil
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Initial Condition
• Zone A – Gas Cap
– Gas phase is only continuous phase, thus
– With So = 0, we can find,
– Also Sw = Swi, thus
– And last, Sg = 1 – So - Sw
gdz
gdp
maxg
Scog
pg
po
p
)wi
S(cow
po
pw
p
![Page 6: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/6.jpg)
Initial Condition
• Zone B – Oil/Gas Transition
– Both oil and gas phases are continuous, thus
– From the oil and gas pressures, find Pc
– Which allows the determination of gas saturation distribution
– Also Sw = Swi, thus
– And last, So = 1 – Sg - Sw
odz
odp
andgdz
gdp
op
gp
gS
cogp
)wi
S(cow
po
pw
p
![Page 7: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/7.jpg)
Initial Condition
• Zone C – Oil Zone
– oil phase is only continuous phase, thus
– With Sg = 0, we can find,
– Also Sw = Swi, thus
– And last, So = 1 – Sg - Sw
odz
odp
)0(cog
po
pg
p
)wi
S(cow
po
pw
p
![Page 8: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/8.jpg)
Initial Condition
• Zone D – Oil/water Transition
– Both oil and water phases are continuous, thus
– From the oil and water pressures, find Pc
– Which allows the determination of water saturation distribution
– Also Sg = 0, thus
– And last, So = 1 – Sg - Sw
odz
odp
andwdz
wdp
wp
op)
wS(
cowp
)0(cog
po
pg
p
![Page 9: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/9.jpg)
Initial Condition
• Zone E – water Zone
– water phase is only continuous phase, thus
– With So = 0, we can find,
– Also Sg = 0, thus
– And last, Sw = 1
wdz
wdp
)max,w
S(cow
pw
po
p
)0(cog
po
pg
p
![Page 10: Simulator](https://reader035.vdocument.in/reader035/viewer/2022080222/563dba1a550346aa9aa2c1ad/html5/thumbnails/10.jpg)
Initial Condition
Example: Initialization of Tutorial 2
x
y
zzo= 3000m
Pa =337.582 bar
Po=331.65 bars
WOC = 3085m Pcow=0 bars
GOC = 3000m Pcog=0 bars
Aquifer datum depth = 3113.2m