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Displacement flow and mixing of fluids occur in many operations present in the construction and completion of oil & gas wells e.g. primary cementing, drilling, gravel-packing, hydraulic fracturing. Over the past many years oil prices have increased significantly as a result of a diminishing supply of oil and gas from easily accessible reservoirs coupled with an increased demand due to population and consumption growth. Inevitably, there is a tendency towards deeper wells offshore and towards more challenging wells onshore. Many oil and gas wells required are long and are inclined anywhere...

Two-layer flows are found in both nature and industry, e.g. coating, co-extrusion. At certain operating conditions, wavy interfaces, also known as instabilities, are observed in the flow that affect the quality of the final products. A long-standing problem has been how to design the process simply in a way that remains faithful to the flow stability. Although resolved for single fluid flows around 10 years ago, extending this methodology to multi-fluid flows has been evolved more slowly owing to the difficulties associated with the interface between the fluids. In this book, these flows have...