AQUFETP
Recognised by the OPM Flow parserSOLUTIONSCHEDULE
Variant 1 — SOLUTION section
The AQUFETP keyword defines Fetkovich288 Fetkovich, M. J. “A Simplified Approach to Water Influx Calculations - Finite Aquifer Systems,” Journal of Petroleum Technology, (1971) 23, No. 7, 814-828. analytical aquifers and the aquifer properties. Each row entry in the AQUFETP keyword defines one Fetkovich analytical aquifer. In order to fully define this type of aquifer, the aquifer must be connected to the reservoir using the AQUANCON keyword in the GRID or SOLUTION sections.
Fetkovich, M. J. “A Simplified Approach to Water Influx Calculations - Finite Aquifer Systems,” Journal of Petroleum Technology, (1971) 23, No. 7, 814-828.
Notes:
The keyword is followed by up to NANAQ records as defined on the AQUDIMS keyword in the RUNSPEC section
Each record is terminated by a “/” and the keyword should be terminated by a “/”. Note the commercial simulator only requires a terminating “/” if the number of records on this keyword are less than NANAQ on the AQUDIMS keyword in the RUNSPEC section. If the number of records are equal to NANAQ and a terminating “/” has been entered then the commercial simulator will issue a warning message; however, the commercial simulator run will proceed as expected.
Note this keyword should only be used in equilibration and enumerated initialize runs, that is it should be omitted from RESTART runs.
Note
If the model is unstable then this may be due to an aquifer not being in equilibrium with the connecting reservoir blocks, for example if the aquifer is connected to some hydrocarbon reservoir cells. Try commenting out the aquifer and see if this resolves the instabilities, and if so amend the aquifer connections accordingly.
- Records
- One or more records, each terminated by
/ - Items per record
- 9
Parameters
| No. | Name | Description | Type | Dimension | Field | Metric | Lab | Default |
|---|---|---|---|---|---|---|---|---|
| 1 | AQUIFER_manual: AQUID | A positive integer greater than or equal to one and less than or equal to NANAQ on the AQUDIMS keyword in the RUNSPEC section, that defines the Fetkovich aquifer number. | INT | 1 | ||||
| 2 | DAT_manual: DATUM | DATUM is a single positive value that defines the Fetkovich reference datum depth for PRESS. | DOUBLE | Length | feet | m | cm | None |
| 3 | P0manual: PRESS | PRESS is a single positive value that defines the aquifer pressure at DATUM. If PRESS is defaulted then the simulator will set the aquifer’s initial reservoir pressure to be in equilibrium with the cells the aquifer is contacted to. Defaulting this parameter will avoid inconsistent equilibration pressures between the reservoir cells and the aquifer. | DOUBLE | Pressure | psia | barsa | atma | 1* |
| 4 | V0manual: PORV | A real positive value that defines the initial water volume of the aquifer. | DOUBLE | LiquidSurfaceVolume | stb | sm3 | scc | None |
| 5 | C_manual: COMP | COMP is a real number defining the total compressibility (Ct) of the aquifer, that is the rock compressibility (Cf) plus the water compressibility (Cw) at the aquifer datum pressure (DATUM) and is defined as: [C sub{t}~=~ C sub{f}`+`C sub {w}] | DOUBLE | 1/ | 1/ | 1/ | 1/ | None |
| 6 | PI | A real positive number that defines the aquifer productivity index based on the aquifer influx rate per unit pressure drop. | DOUBLE | LiquidSurfaceVolume/ | stb/ | sm3/ | scc/ | None |
| 7 | TABLE_manual: PVTW | A positive integer that defines the aquifer’s PVTW water property table. | INT | 1 | ||||
| 8 | SALINITYmanual: SALTCON | SALTCON is a real positive number that defines the initial salt concentration in the aquifer, for when the simulator's Brine Model has been activated via the BRINE keyword in the RUNSPEC section. This variable is ignored by OPM Flow. | DOUBLE | Concentration | lb/ | kg/ | gm/ | 0.0 |
| 9 | TEMP | TEMP is a real positive number that defines the initial temperature of the aquifer at DATUM for use with OPM Flow's thermal option. The THERMAL keyword in the RUNSPEC section must be activated to use this option. | DOUBLE | Temperature | °F | °C | °C | 1* |
Example
Given the following grid and aquifer dimensions in the RUNSPEC section:
-- ==============================================================================
--
-- RUNSPEC SECTION
--
-- ==============================================================================
RUNSPEC
--
-- MAX MAX MAX
-- NDIVIX NDIVIY NDIVIZ
DIMENS
20 1 5 /
-- AQF AQF AQF AQF AQF AQF AQF AQF
-- MXAQN MXNAQC NIFTBL NRIFTB NANAQU NCAMAX MXNALI MXAAQL
AQUDIMS
1* 1* 5 100 1 1* 1* 1* /
The Fetkovich analytical aquifer is defined in the SOLUTION sections as:
-- ==============================================================================
--
-- SOLUTION SECTION
--
-- ==============================================================================
SOLUTION --
-- FETKOVICH AQUIFER DESCRIPTION
--
-- ID DATUM AQF AQF AQF AQF AQF SALT
-- NUM DEPTH PRESS VOLM COMP PI PVT CONC
--
AQUFETP
1 1130. 1* 1.0E+12 3.0E-5 500E3 1 0.0 /
/
And the connection of the aquifer is set in the GRID or the SOLUTION sections as:
--
-- ANALYTIC AQUIFER CONNECTION
--
-- ID ---------- BOX --------- CONNECT AQF AQF ADJOIN
-- NUMBER I1 I2 J1 J2 K1 K2 FACE INFLX MULTI CELLS
AQUANCON
1 1 1 1 1 1 1 J- 1.0 1.0 'NO' /
/
Here one Fetkovich analytical aquifer is connected to a single cell (1, 1, 1) at the J- face (or Y- face) of the cell.
| Note If the model is unstable then this may be due to an aquifer not being in equilibrium with the connecting reservoir blocks, for example if the aquifer is connected to some hydrocarbon reservoir cells. Try commenting out the aquifer and see if this resolves the instabilities, and if so amend the aquifer connections accordingly. |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|Manual source: parts/chapters/subsections/10.3/AQUFETP.fodt
Variant 2 — SCHEDULE section
The AQUFETP keyword defines Fetkovich Analytical aquifers and the aquifer properties. Each row entry in the AQUFETP keyword defines one Fetkovich Analytical aquifer. In order to fully define this type of aquifer, the aquifer must be connected to the reservoir using the AQUANCON keyword in the GRID or SOLUTION sections.
See AQUFETP – Define Fetkovich Analytical Aquifers in the SOLUTION section for a full description.
- Records
- One or more records, each terminated by
/ - Items per record
- 9
Manual source: parts/chapters/subsections/12.3/AQUFETP.fodt