Hi, I have a problem with a simple quarter 5 spot waterflood model where I would like to inject water with field voidage replacement. There are two wells: injector, INJ, and producer, PROD. I would hope that the field voidage replacement takes the production rate in reservoir volumes and uses that to inject water at the same reservoir volumetric rate. If the injection and production volumes are the same the field average pressure, FPR, should be relatively constant.
The problem I have is that while the reported FVIR and FVPR are the same and
the FWIR seems to be right as is the sum of FOPR and FWPR, the FPR (average
pressure) does not remain relatively constant. Instead there is a drift as if
the actual volumes injected and produced are different.
The problem seems to be to do with the definition of the formation volume
factor for water, Bw, that is defined in the PVTW keyword. Bw is defined at a
reference pressure which is the same as the initial average pressure. If it is
1.0 exactly then the hoped for result is obtained. If I use a more realistic
value of 1.02, the volumes are incorrect and FPR eventually rises when water
breaks through. Similarly if Bw is set to 0.99, the pressure goes down. I have
deliberately set the compressibility of water to be very small and in PVDO, the
Bo (formation volume factor for oil) is almost independent of pressure (when I
started, Bo and Bw were dependent on pressure).
Perhaps I am doing something wrong with the keywords, there is a setting I need
to implement or is there a a bug in the code?
Can anyone help?
I attach my code for analysis.
Using Eclipse I can get a good result. I set up the well controls with:
- GRP Fluid Control Surf Resv ReInj Voidage GRUP
-- NAME TYPE mode rate rate frac Frac CNTL
-- ---- ----- ------ ------- ---- ---- ---- ---- -----
GCONINJE
FIELD WATER VREP 15000 2* 1.0 NO /
/
-- Injection control
-- Well Fluid Status Control Surf Resv BHP
-- NAME TYPE mode rate rate limit
-- ---- ----- ------ ------- ---- ---- -----
WCONINJE
INJ WATER OPEN GRUP 15000 1* 8000 /
/
This doesn't work in OPM where I have to add the group control for my injector,
INJ.
- GRP Fluid Control Surf Resv ReInj Voidage GRUP
-- NAME TYPE mode rate rate frac Frac CNTL
-- ---- ----- ------ ------- ---- ---- ---- ---- -----
GCONINJE
FIELD WATER VREP 15000 2* 1.0 NO /
G2 WATER VREP 15000 2* 1.0 YES / -- THIS IS
EXTRA!!!!!!!!
/
-- Injection control
-- Well Fluid Status Control Surf Resv BHP
-- NAME TYPE mode rate rate limit
-- ---- ----- ------ ------- ---- ---- -----
WCONINJE
INJ WATER OPEN GRUP 15000 1* 8000 /
/
Karl Stephen
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