STUDY OF MULTIPHASE FLOW BEHAVIOR IN VERTICAL OIL WELLS: PART II - FIELD APPLICATION.
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In the second part of the paper, the authors show the application of a vertical multiphase flow model, developed from first principles. Estimation of gas void fraction, or mixture density - leading to pressure gradient estimates in each flow regime, and transition from one flow regime to another are modeled rigorously. An appropriate model is also used to handle flow in a tubing-casing annulus. Parameters, such as, tubing to casing-diameter ratio and the equivalent diameter of the flow channel, developed from experimental work, are incorporated in the model. Thus the model is capable of handling flow in both circular and annular channels.