. Contents l. Introduction 9 4.3 Ranges of Mobility Ratios During Waterflooding 46 1.1 General History and Development of Waterflooding 9 1.2 Relation Between Reservoir 5. Areal Sweep Efficiency 48 Engineering and Production 5.1 Definition 48 Engineering. Efficiency 48 Engineering and Production 5.1 Definition 48 Engineering Aspects of Waterflooding 9 1.3 Objectives of the Monograph 10 5.2 Measurement 48 1.4 Organization of the Monograph 10 5.3 Areal Sweep Efficiency. Fingering 34 7.2 Influence of Mobility Ratio 69 3.4 Mobility of the Connate Water 34 7.3 Influence of Gravity Forces 71 3.5 Practical Application of the Frontal 7.4 Influence of Capillary Forces 72 Advance Theory 35 7.5 Crossftow