Productivity index of multilateral wells

In the history of petroleum science there are a vast variety of productivity solutions for different well types, well configurations and flow regimes. The main well types that were considered for calculating the productivity indexes were vertical wells and horizontal wells. The configurations considered were multilayer perforations, dual lateral wells with laterals at same depths, stacked wells etc. There are few solutions to estimate the well productivity for complex configurations like multilateral wells.;The main objective of this work is to identify a numerical solution method for calculating productivity indexes for different well configurations like single vertical well, single horizontal well, dual lateral well with laterals at same depth, dual laterals with laterals at different depths and four laterals well. A three-phase, three-dimensional black oil reservoir simulator (ECLIPSE) is used in this thesis. Apart from comparing the productivity indexes of different well configurations, dimensionless pressure derivatives with respect to dimensionless time is also compared for all the above well configurations