On the replacement in layer-heterogeneous formations (in the order of discussion)

The oil fields of Azerbaijan are predominantly classified with layered formations with heterogeneous permeability. This is the reason for the fast watercut, formation of residual non-recoverable reserves in low-permeable reservoir zones, and for the decrease of production rate. The paper reviews the specification of the averaged value of phase permeability for the layers with decreasing permeability by depth in case when the water moves equally from upper to lower layers. The method described is generalized and effectively implemented provided that the curves of relative phase permeability corresponding to the end points change from layer to layer as well.