Page 237 - Principles of Applied Reservoir Simulation 2E

222 Principles of Applied Reservoir Simulation

= - (5.6146)
V PT

3
V P = <|) AJC AJF Az = pore volume (ft )
Q = volumetric flow rate at reservoir conditions (RB/day)
Af = timestep size (day)
Timesteps for an IMPES simulator should correspond to about 1 0% throughput
or less. The maximum timestep is estimated as follows.
Suppose (]> = 22.5%, A* = A>> = 200', Az = h net, and Q = 400 RB/day.
Then A? is found by setting V PT = 0.10 and rearranging the pore volume
throughput equation to give

5.6146Q 5.61460
= QAh net (days)

If h net = 100 ft, then A? « 40 days is an estimate of the maximum IMPES
timestep size.

22.2 Full Field (3D) Model History Match

Data file CS-HM.DAT is the three-dimensional model used to prepare
the production history presented in Chapter 20. The grid in Figure 22- 1 was used

Figure 22-1. Plan view of grid.