This paper discusses field examples of production-logging problems in large-diameter, deviated wells, with bi-phasic flow. Two distinct flow regimes that tend to make flow-profile evaluation somewhat problematic have been identified. The paper gives examples of both flow regimes and details of how the existence of these particular phenomena can be predicted. The paper discusses the problems that these phenomena can cause in reservoir management and gives a brief discussion of the flow-loop research project that has been initiated at Robert Gordon's Institute of Technology in Aberdeen. The project is designed to simulate the complex flow regimes that exist in large-diameter deviated holes and, by means of the visual and mechanical aspects of the loop to aid in developing tools or interpretation techniques to help overcome the problem.

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