Patent Document ID: 20120203518
Application ID: 13023728
Patent Flag: 0

Claim One:
1. A computer implemented method of forming a well model for reservoir simulation of well in a subsurface reservoir from a reservoir model having formation layers having vertical fluid flow and flow barrier layers with no vertical fluid flow, the method comprising the computer implemented steps of: forming a reduced system model of the reservoir from a full reservoir model by assembling as a single vertical flow layer the flow layers having vertical flow and located adjacent a flow barrier layer in the reservoir model; solving by matrix computation the reduced system model for the bottom hole pressure of the well and residual unknowns; solving the full reservoir model by treating the well as having the determined bottom hole pressure; determining completion rates for the layers of the well for the full reservoir model; determining total rate for the well from the determined completion rates for the layers of the well; and forming a record of the determined completion rates for the layers and the determined total rate for the well.