Patent Document ID: 20140129199
Application ID: 14040930
Patent Flag: 0

Claim One:
1. A computer implemented method of forming a coupled well reservoir model during reservoir simulation of well production rate of component fluids from a plurality of wells in a subsurface reservoir and layer completion rates of perforated well intervals in the wells, the model being organized into a reservoir grid subdivided into a plurality of reservoir cells including cells at the perforated well intervals, the perforated well intervals in the reservoir being located at a plurality of formation layers, the formation layers having fluid completion rates for component fluids, and the formation layers comprising vertical fluid flow layers having vertical fluid flow therefrom and flow barrier layers with no vertical fluid flow therefrom, the formation layers further having a permeability, thickness and a layer potential, the computer implemented method determining layer completion rates for the component fluids from the formation layers of the wells and well production rates of the component fluids from the wells, the computer implemented comprising the steps of: (a) forming a full computation matrix reservoir model of reservoir data of cells of the model, including the reservoir data for the cells at the perforated well intervals, the reservoir data including the permeability, thickness and a potential for the formation layers; (b) forming a reduced well model system matrix by assembling as a single vertical flow layer in the matrix the data of the vertical fluid flow layers of vertical fluid flow layers adjacent flow barrier layers in the reservoir model; (c) determining a bottom hole pressure and the formation pressures and saturations for the cells at the perforated well intervals of the reduced well model system matrix; (d) forming a coupled reservoir well model comprising the full computation matrix reservoir model and the reduced system model matrix, treating the wells as bottomhole, pressure specified pressure specified wells having the determined bottom hole pressure; (e) solving the coupled reservoir well model for the fluid flows in the reservoir cells of the formation layers and the productivities and potentials of the cells of the reservoir; (f) solving the coupled reservoir well model for the productivity indexes of the cells at the perforated well intervals of the reservoir; (g) determining layer completion rates for the component fluids of the vertical fluid flow layers and the flow barrier layers of the well based on the determined productivity indexes of the cells at the perforated well intervals of the reservoir; (h) determining total well production rate for the wells from the determined layer completion rates for the component fluids of the vertical fluid flow layers and the flow barrier layers of the wells; and (i) forming a record of the determined layer completion rates for the component fluids of the vertical fluid flow layers and the flow barrier layers of the wells and the determined total well production rate for the wells.