Abstract
The stability of a flood front can influence the efficiency of fluid displacement. A front is stable if it retains the shape of the interface between displaced and displacing fluids as the front moves through the medium. An analysis of frontal stability is presented in this chapter in terms of a specific example: the advance of water–oil displacement front. Front stability is then studied using linear stability analysis. The displacement of one phase by another may be analytically studied if one simplifies the problem to displacement in a linear, homogenous porous medium. The effectiveness of a displacement process depends on many factors, including some that are beyond the control, such as depth, structure, and fluid type. Other factors that influence displacement efficiency, however, can be controlled. These include the number and type of wells, well rates, and well locations. The analytical techniques for describing displacement apply to fluid displacement between one injection well and one production well. The alignment of the injector-producer pair represents a linear displacement process.
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