This practical volume provides a quantitative understanding of waterflooding and the engineering application of this oil-recovery method. It includes prediction of water injection rates, oil production rates, producing water/oil ratios, and cumulative oil recovery at various times in the future. The monograph features chapters on basic water/oil flow properties of reservoir rock, efficiency of oil displacement by water, mobility ratio concept, areal sweep efficiency, reservoir heterogeneity, vertical and volumetric sweep efficiencies, methods of predicting performance, and pilot waterflooding. Appendices include detailed mathematical derivations and example calculations.