Page 330 - Principles of Applied Reservoir Simulation 2E

Part V: Technical Supplements 315

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where ty R is the pseudo-pressure corresponding to the nodal pressure P". Rates
for each phase in connection k are computed by mobility allocation as shown
in Eqs, (30.7) through (30.9).

Case 3: Injection Wells
The injection rate for a water or gas injection well is computed from
( A. + A, + V
I B ,

where the subscript/? denotes water or gas, and PID=WI. Fluid injection occurs
n
when P < PWF. If P" > PWF, the injection well is shut in. Also note that total
mobility is used for the injection well rate calculation. The reason for this was
discussed in the first section of this chapter.

30.3 GOR/WOR Constraints

Maximum gas-oil and water-oil ratios (GORMAX, WORMAX respec-
tively) are input by the user and apply to every oil production well. GOR for a
well is defined as total gas production divided by total oil production for all
active well completion intervals. If GOR for the well exceeds GORMAX, then
the completion interval (connection) with the highest GOR will be shut in. If
more than one connection has the same maximum GOR, the shallowest
connection will be shut in first. The procedure is repeated until GOR is less than
GORMAX or until the well is shut in.
The ratio WOR is defined as total water production divided by total oil
production for all active well completion intervals. If WOR for the well exceeds
WORMAX, then the completion interval (connection) with the highest WOR
will be shut in. If more than one connection has the same maximum WOR, the
deepest connection will be shut in first. The procedure is repeated until WOR
is less than WORMAX or until the well is shut in.