OPERATE — OPM Flow Keyword Reference

Variant 1 — GRID section

The OPERATE keyword performs a mathematical operation on a specified array or part of an array, optionally using another specified array as input to the operation. The keyword allows for various mathematical functions and their associated variables to be defined and applied to the specified array. Input constants can be integer or real valued depending on the array type; however, the arrays that can be operated on are dependent on which section the OPERATE keyword is being applied in.

Notes:

Where NX, NY and NZ are the dimensions of the model as defined on the DIMENS keyword in the RUNSPEC section.

Each record must be terminated by a “/” and the keyword is terminated by a “/”.

Examples of the arrays most commonly operated on in each section are given in Table 6.95. Cells colored red indicate arrays that are not supported by OPM Flow operations.

OPERATE Keyword and Variable Options by Section

DX

DEPTH

SWL

ENDNUM

PRESSURE

DY

PORV

SWCR

EQLNUM

SWAT

DZ

TRANX

SWU

FIPNUM

SGAS

PERMX

TRANY

SGL

IMBNUM

RV

PERMY

TRANZ

SGCR

MISCNUM

RS

PERMZ

DIFFX

SGU

PVTNUM

TBLK

MULTX

DIFFY

KRW

ROCKNUM

GI

MULTY

DIFFZ

KRO

SATNUM

OILAPI

MULTZ

TRANR

KRG

WH2NUM

SALT

DR

TRANTHT

PCG

GASCONC

DTHETA

DIFFR

PCW

SOLVCONC

PERMR

DIFFTHT

SOLVFRAC

PERMTHT

SFOAM

DZNET

SPOLY

PORO

NTG

FLUXNUM

MULTNUM

MPFANUM

DIFFX

DIFFY

DIFFZ

DIFFR

DIFFTHT

Table 6.95: OPERATE Keyword Applicable Arrays by Section

Double precision and integer work arrays may also be used to hold temporary values for use in more complex operations. Note that these work arrays are reset to zero at the start of each section of the data file. The names of the double precision work arrays should be of the form 'WORKn', where n is a positive integer that defines the work array index, for example 'WORK1', 'WORK2', and so on. Similarly, the names of integer work arrays should be of the form 'IWORKn', for example 'IWORK1', 'IWORK2', and so on. OPM Flow currently only supports double precision work arrays, and does not currently support using work arrays with "global" arrays (MULTZ*). Note that the permeability arrays (PERM*) are treated as "global" arrays in the GRID section only. In the commercial simulator the maximum number of double precision and integer work arrays are specified using the REGDIMS keyword. Whereas, OPM Flow does not impose a limit on the maximum number of work arrays.

Note that care should be exercised when performing operations on integer array data as all transforms are performed using floating point arithmetic operations. In addition, operations on any of the transmissibility arrays (TRANX, TRANX-, TRANY, TRANY-, TRANZ, and TRANZ-) may result in untended consequences as these arrays have zero values on the boundary of the grid. In this use OPM ResInsight to verify and visually inspect the results.

Records: One or more records, each terminated by /
Items per record: 11

Parameters

No.	Name	Description	Type	Default
1	`TARGET_ARRAY` manual: `Y`	A character string of up to eight characters in length that defines the keyword identifying the array to be modified.	STRING	None
2	`I1`	A positive integer that defines the lower bound of the array in the I-direction to be modified must be greater than or equal to one and less than or equal to I2 and NX.	INT	1
3	`I2`	A positive integer that defines the upper bound of the array in the I-direction to be modified must be greater than or equal to I1 and less than or equal to NX	INT	NX
4	`J1`	A positive integer that defines the lower bound of the array in the J-direction to be modified must be greater than or equal to one and less than or equal to J2 and NY.	INT	1
5	`J2`	A positive integer that defines the upper bound of the array in the J-direction to be modified must be greater than or equal to J1 and less than or equal to NY.	INT	NY
6	`K1`	A positive integer that defines the lower bound of the array in the K-direction to be modified must be greater than or equal to one and less than or equal to K2 and NZ.	INT	1
7	`K2`	A positive integer that defines the upper bound of the array in the K-direction to be modified must be greater than or equal to K1 and less than or equal to NZ.	INT	NZ
8	`OPERATION` manual: `EQUATION`	A defined character string of up to eight characters that defines the mathematical function to be applied, using the X array and the ALPHA and BETA constants declared on this keyword. EQUATION should be set to one of the following character strings:	STRING	None
9	`ARRAY_PARAMETER` manual: `X`	A character string of up to eight characters in length that defines the keyword identifying the array to be used as an input parameter.	STRING	None
10	`PARAM1` manual: `ALPHA`	An integer or real value that is the α variable in the EQUATION function.	DOUBLE	None
11	`PARAM2` manual: `BETA`	An integer or real value that is the β variable in the EQUATION function.	DOUBLE	None

Example

The first example uses the MULTP function combined with the Net-to-Gross (NTG) array to re-scale the MULTX, MULTY and MULTZ arrays to reduce the transmissibility in three separate reservoirs based on the reservoir quality (NTG).
--
-- MATHEMATICAL OPERATIONS ON ARRAYS BY CELL
--
-- OUTPUT ---------- BOX --------- OPERATION INPUT ALPHA BETA
-- ARRAY I1 I2 J1 J2 K1 K2 --------- ARRAY ----- ----
OPERATE
MULTX 1* 1* 1* 1* 1 32 ‘MULTP’ NTG 1.00 0.75 / RES1
MULTY 1* 1* 1* 1* 1 32 ‘MULTP’ NTG 1.00 0.75 / RES1
MULTZ 1* 1* 1* 1* 1 32 ‘MULTP’ NTG 1.00 0.75 / RES1
MULTX 1* 1* 1* 1* 34 64 ‘MULTP’ NTG 1.00 0.85 / RES2
MULTY 1* 1* 1* 1* 34 64 ‘MULTP’ NTG 1.00 0.85 / RES2
MULTZ 1* 1* 1* 1* 34 64 ‘MULTP’ NTG 1.00 0.85 / RES2
MULTX 1* 1* 1* 1* 67 96 ‘MULTP’ NTG 1.00 0.50 / RES3
MULTY 1* 1* 1* 1* 67 96 ‘MULTP’ NTG 1.00 0.50 / RES3
MULTZ 1* 1* 1* 1* 67 96 ‘MULTP’ NTG 1.00 0.50 / RES3
/
The next example shows how to set the maximum gas saturation (SGU) based on the minimum (lowest) water saturation (SWL) when using the End-Point Scaling option.
--
-- MATHEMATICAL OPERATIONS ON ARRAYS
--
-- OUTPUT ---------- BOX --------- OPERATION INPUT ALPHA BETA
-- ARRAY I1 I2 J1 J2 K1 K2 --------- ARRAY ----- ----
OPERATE
SGU 1* 1* 1* 1* 1* 1* 'MULTA' SWL -1.0 1.0 /
/
The above example sets the maximum gas saturation to be one minus the minimum water saturation.
| OPERATE Keyword and Variable Options by Section |         |       |         |          |         |          |
|-------------------------------------------------|---------|-------|---------|----------|---------|----------|
| GRID                                            | EDIT    | PROPS | REGIONS | SOLUTION | SUMMARY | SCHEDULE |
| DX                                              | DEPTH   | SWL   | ENDNUM  | PRESSURE |         |          |
| DY                                              | PORV    | SWCR  | EQLNUM  | SWAT     |         |          |
| DZ                                              | TRANX   | SWU   | FIPNUM  | SGAS     |         |          |
| PERMX                                           | TRANY   | SGL   | IMBNUM  | RV       |         |          |
| PERMY                                           | TRANZ   | SGCR  | MISCNUM | RS       |         |          |
| PERMZ                                           | DIFFX   | SGU   | PVTNUM  | TBLK     |         |          |
| MULTX                                           | DIFFY   | KRW   | ROCKNUM | GI       |         |          |
| MULTY                                           | DIFFZ   | KRO   | SATNUM  | OILAPI   |         |          |
| MULTZ                                           | TRANR   | KRG   | WH2NUM  | SALT     |         |          |
| DR                                              | TRANTHT | PCG   |         | GASCONC  |         |          |
| DTHETA                                          | DIFFR   | PCW   |         | SOLVCONC |         |          |
| PERMR                                           | DIFFTHT |       |         | SOLVFRAC |         |          |
| PERMTHT                                         |         |       |         | SFOAM    |         |          |
| DZNET                                           |         |       |         | SPOLY    |         |          |
| PORO                                            |         |       |         |          |         |          |
| NTG                                             |         |       |         |          |         |          |
| FLUXNUM                                         |         |       |         |          |         |          |
| MULTNUM                                         |         |       |         |          |         |          |
| MPFANUM                                         |         |       |         |          |         |          |
| DIFFX                                           |         |       |         |          |         |          |
| DIFFY                                           |         |       |         |          |         |          |
| DIFFZ                                           |         |       |         |          |         |          |
| DIFFR                                           |         |       |         |          |         |          |
| DIFFTHT                                         |         |       |         |          |         |          |

Manual source: parts/chapters/subsections/6.3/OPERATE.fodt

Variant 2 — EDIT section

This keyword, OPERATE, defines mathematical operations on property arrays (NTG, PORO etc.) and optionally using another property array as input to the function. The keyword allows for various mathematical functions and their associated variables to be defined and applied to the selected array data. Input constants can be real or integer depending on the array type; however, the arrays that can be operated on is dependent on which section the keyword is being used.

See OPERATE – Define Mathematical Operations on Arraysin the GRID section for a full description.

Records: One or more records, each terminated by /
Items per record: 11

Manual source: parts/chapters/subsections/7.3/OPERATE.fodt

Variant 3 — PROPS section

This keyword, OPERATE, defines mathematical operations on property arrays (NTG, PORO etc.) and optionally using another property array as input to the function. The keyword allows for various mathematical functions and their associated variables to be defined and applied to the selected array data. Input constants can be real or integer depending on the array type; however, the arrays that can be operated on is dependent on which section the keyword is being used.

See OPERATE – Define Mathematical Operations on Arraysin the GRID section for a full description.

Records: One or more records, each terminated by /
Items per record: 11

Manual source: parts/chapters/subsections/8.3/OPERATE.fodt

Variant 4 — REGIONS section

This keyword, OPERATE, defines mathematical operations on property arrays (NTG, PORO etc.) and optionally using another property array as input to the function. The keyword allows for various mathematical functions and their associated variables to be defined and applied to the selected array data. Input constants can be real or integer depending on the array type; however, the arrays that can be operated on is dependent on which section the keyword is being used.

See OPERATE – Define Mathematical Operations on Arraysin the GRID section for a full description.

Records: One or more records, each terminated by /
Items per record: 11

Manual source: parts/chapters/subsections/9.3/OPERATE.fodt

Variant 5 — SOLUTION section

This keyword, OPERATE, defines mathematical operations on property arrays (NTG, PORO etc.) and optionally using another property array as input to the function. The keyword allows for various mathematical functions and their associated variables to be defined and applied to the selected array data. Input constants can be real or integer depending on the array type; however, the arrays that can be operated on is dependent on which section the keyword is being used.

See OPERATE – Define Mathematical Operations on Arraysin the GRID section for a full description.

Records: One or more records, each terminated by /
Items per record: 11

Manual source: parts/chapters/subsections/10.3/OPERATE.fodt