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Aquifer Modelling
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Aquifer Modeling
ECLIPSE Blackoil provides these aquifer options:
Numerical Aquifer
Analytical Aquifer
Carter-Tracy aquifer
Fetkovich aquifer
Flux Aquifer
Grid Cell Aquifer
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Nominate grid cells below the OW contact (AQUNUM)
Attach the aquifer to the reservoir using AQUCONLeave a row of water cells between the aquifer & oil zone
Oil Zone
No Flow
Aquifer Cells
GRID
AQUNUM
--Aq# I J K Area Length
1 3 7 1 1E2 1E2 0.3 /
1 4 7 1 1E4 1E3 0.3 /
1 5 7 1 1E6 1E4 0.3 /
AQUCON
--Aq# I1 I2 J1 J2 K1 K2 Face
1 1 1 2 6 1 1 I- /
Numerical Aquifer
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Fetkovich Aquifers
Fetkovich aquifers are based on a pseudo-steady stateproductivity index and material balance between aquifer
pressure and cumulative influxThey are best suited for smaller aquifers which mayapproach psuedo steady state quickly
In the Solution Section:
Set up lists of aquifers AQUALIST
Define the aquifer with AQUFETP Connect the aquifer with AQUANCON
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Carter-Tracy Aquifers
Carter-Tracy aquifers use tables of dimensionless time tdversus dimensionless pressure Pd(td)to determine the influx
Carter-Tracy approximates a fully transient model
In the Solution Section:
Set up lists of aquifers AQUALIST
Define the aquifer with AQUCT
Define pressure response with AQUTAB
Connect the aquifer with AQUANCON
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Flux Aquifers
The flux rate is specified directly by the user:
It may be negative, representing flux out of the reservoir
The flux rate may be modified in the Schedule Section
In the Solution section
Set up lists of aquifers AQUALIST
Specify the aquifer using AQUFLUX
Attach the aquifer using AQUANCON
iiaai mAFQ =
Fa is the flux
Ai the area of the connecting cell block
mi is an aquifer influx multiplier
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Grid Cell Aquifer
Simulation model extends over the water zone
No extra keywords necessary
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Output Controls
Summary Quantities
Analytic aquifers
AAQR, AAQT, AAQP
Numerical aquifers
ANQR, ANQT, ANQP
Print file data
RPTGRID, RPTSCHED, RPTSOL
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9This slide does not appear in the manual