This study addresses oil bypassing caused by water invasion to wells in edge and bottomwater-drive oil reservoirs – a significant problem worldwide. It is shown that the amount of by-passed (not recovered) oil is significant and could be predicted analytically and reduced by modifying well's completion. A large statistical sample from the population of possible reservoir-well systems with edge and bottom-water has been created theoretically using several databases of actual reservoirs properties worldwide. Dimensional analysis allowed converting reservoir properties distributions into dimensionless group distributions. Then, the amount of by-passed oil was correlated with the dimensionless groups using designed experiments conducted on a reservoir simulator. The resulting correlations determine the percent amount of movable oil that could be recovered by the end of well's operation, when the water cut value reaches its maximum limit. They also show how operational parameters such as well spacing, penetration and production rate may affect oil recovery.

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