1.

Divide the reservoir into the required number of layers.

2.

Calculate the performance of the base layer (layer n) from Start to Interference to Fillup to Water Breakthrough to End.

3.

Obtain values of cumulative liquid volumes (NP, WP, Winj) and liquid rates (qo, qw, qwi) as a function of time t for the base layer (layer n).

4.

For each layer, including the base layer n, calculate the following : ( k / f ), ( f . h ) and ( k . h )

5.

For each reporting timestep, the following is calculated for each layer i . Where, n = base layer, i = layer i, NP*, WP*, Winj* = volumes at t*, qo*, qw*, and qwi* =rates at t*

6.

The composite multi layer performance at each reporting timestep t is obtained by the summation of all the individual layer values.