[Opm] MULTNUM, PVTNUM issue

[Manoel Farias]

Dears,

I am working with a model with a strong dependency between oil API and
depth.
Initially, I used the keywords 'EQUALS' and 'PVTNUM' to adress each cell to
its correct PVT table.
However, durigr the forecast phase, after the waterflood startup, the model
became unstable and crashed after several cuts.
I did a quick check at OPM Flow manual and it says that a possible cause is
oil migration between PVT regions causing material balance errors.
I added the following keywords in my deck:

*Section RUNSPEC*

*GRIDOPTS*
*'NO' 4 1* /*

*SECTION GRID*
*-- -- ARRAY CONSTANT -- ---------- BOX --------- *
*-- I1 I2 J1 J2 K1 K2 *
*EQUALS *
*'MULTNUM' 1 1 91 1 85 1 2 / -- SET REGION 1 *
*'MULTNUM' 2 1 91 1 85 3 9 / -- SET REGION 2 *
*'MULTNUM' 3 1 91 1 85 10 40 / -- SET REGION 3*
*'MULTNUM' 4 1 91 1 85 41 80 / -- SET REGION 4*
*/ *
*-- *
*-- SET TRANSMISSIBILITES ACROSS DIFFERENT RESERVOIRS TO ZERO TO ISOLATE *
*-- RESERVOIRS *
*-- *
*-- REGION REGION TRANS DIREC NNC REGION ARRAY *
*-- FROM TO MULT OPT OPTS M / F / O *
*MULTREGT *
*1* 1* 0.0 1* 'ALL' M / *
*/ *

*SECTION REGIONS*
*-- *
*-- COPY AN ARRAY TO ANOTHER ARRAY BASED ON A REGION NUMBER *
*-- *
*-- ARRAY ARRAY REGION REGION ARRAY *
*-- FROM TO NUMBER M / F / O *

*COPYREG *
*'MULTNUM' 'PVTNUM' 1 M / -- COPY MULT TO PVT 1*
*'MULTNUM' 'PVTNUM' 2 M / -- COPY MULT TO PVT 2*
*'MULTNUM' 'PVTNUM' 3 M / -- COPY MULT TO PVT 3*
*'MULTNUM' 'PVTNUM' 4 M / -- COPY MULT TO PVT 4*
*/ *
The message I got from Flow is:
[image: image.png]

Can anybody give a hint about how to overcome this problem?

Thanks in advance,

Manoel Farias, DSc
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