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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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