This is the
Next >> page accessed in WizGen (in "Flexible Project" mode) from the
Output - derived and user-defined properties page or by selecting the
Goto... button for
Two phase flow - specify inputs for grouping calculations from the
Contents page when the
Include two-phase fault rock calculations option has been toggled "on" via the
Title page of WizGen.
NOTE:- The next three pages can only be accessed in WizGen if the TransGen installation is licensed to support the Two-phase flow module (see section below on Using the Two-phase flow functionality).
The
Two phase flow - INPUT page of WizGen allows the user to:-
specify the file containing relative permeability tables.
define the source of across-fault flow rates.
input appropriate fluid properties.
HINT:- Use the Demo dataset released with TransGen version 3.2. to compare single-phase and two-phase runs. Two runfiles (SINGLE_PHASE.TGDATA & TWO_PHASE.TGDATA) are included with the Demo data set for the 3D model described in Manzocchi et al. 2002 (see below) The directory ECL_SINGLE_PHASE contains the input (i.e. the file SINGLE_PHASE_FAULTS.DATA) and output (all the other files) for two-phase Eclipse run using only single-phase fault properties (which are calculated from the SINGLE_PHASE.TGDATA file above). The Directory ECL_TWO_PHASE contains input and output for a two-phase Eclipse run using two-phase fault rock properties calculated from the TWO_PHASE.TGDATA file and uses one of the restart files from the Eclipse run above to get the across-fault flow rates.
Manzocchi, T., Heath, A. E., Walsh, J. J., & Childs, C., 2002. The representation of two phase fault-rock properties in flow simulation models.
Petroleum Geoscience, Vol.
8, 119-132.
Flow (from connection property)
If the across-fault flow rates are loaded
from connection property data, a single value of across- fault flow rate (Darcy velocity) should be loaded for each connection, using a user-defined keyword. The format of the file and the loading procedures are the same as for any other user-defined connection property,
i.e. the property must be declared on the
User-defined keywords page and the file loaded on the
Included data page of WizGen.
Both positive and negative values can be used, with a positive value signifying that the flow is from cell I1 J1 K1 to cell I2 J2 K2 and a negative value indicating flow from cell I2 J2 K2 to cell I1 J1 K1.
The units of across- fault Darcy velocity are metres/day (METRIC), ft/day (FIELD) or cm/hour (LAB).
Example:
DARCY_VEL
---I1 J1 K1 I2 J2 K2 VALUE
1 7 1 2 7 4 -0.001893 /
1 7 1 2 7 5 -0.003168 /
1 7 1 2 7 6 -0.000793 /
1 7 1 2 7 7 -0.001144 /
1 7 2 2 7 5 -0.002425 /
...
36 111 20 36 112 15 0.03253 /
36 111 20 36 112 16 0.4242245 /
/
Pressure (from cell property)
Alternatively the across- fault flow rate can be calculated from a grid of cell pressures. The data for these values are loaded into TransGen in the same way as any other user-defined cell property,
i.e. the property must be declared on the
User-defined keywords page and the file loaded on the
Included data page of WizGen.
The units of pressure are bars (METRIC), psi (FIELD) or atm (LAB).
Example:
CELL_PRESSURE
--at 2 years, using PDO U.
265.23 264.91 266.45 266.19 266.16 265.78 265.69 265.58
265.51 265.24 265.14 266.75 298.17 302.67 304.21 305.56
306.7 307.81 309.13 310.6 312.16 313.78 315.23 316.04
330.31 330.31 330.31 330.31 330.31 330.31 330.31 330.31
330.31 330.31 330.31 330.31 330.31 330.31 330.31 330.31
...
276.06 274.51 273.05 271.66 270.31 268.91 267.7 266.84
265.89 264.77 263.86 262.83 262.45 262.52 262.74 337.77
/
Pressure (from Eclipse restart file)
Alternatively the across-fault flow rates can be extracted from a specified Eclipse restart file (*.Xnnnn file output from Eclipse). Toggle the
Obtain from Eclipse restart file option "on" then use the
Browse... button to navigate to the relevant file.
Flows derived from connection property pressure data in an Eclipse restart file, while being less accurate than flow data derived directly from an Eclipse restart file (see below), are probably more generally applicable and have the advantage of always being possible assuming restart files have been output,
i.e. pressures are always written out when Eclipse writes restart files.
Flow (from Eclipse restart file)
Flows from connection properties in the Eclipse restart file can only be used if interblock flows (both neighbour and non-neighbour) are specified using the FLOWS option in the
RPTRST keyword in the Eclipse run. This ensures the connection flows are written to each restart file. The user chooses a particular restart file from which to read the connection flows.
NOTE:- When using either the Pressure or Flow (from Eclipse restart file) option as a source of across-fault flow rates, the EGRID file output by Eclipse is also necessary (and must be present in the same directory) as the particular restart file specified in WizGen. The EGRID file (one per Eclipse run) maps the order of the restart data to actual connections.
