Activities in oil and gas industry have shifted deep offshore. udThere is therefore the need to envisage and accurately provide udfor flow assurance challenges that might be encountered udthroughout the life of a field. Slug flow is one of the flow udassurance concerns confronting the industry. The objective of udthe study was to gain insight into the behaviour of udhydrodynamic slug flow in pipeline-riser system. This udunderstanding is needed for the development of appropriate udslug control strategy. udExperimental studiudes were conducted in a 2” udpipeline-riser udsystem and a 2” horizontal twoud-phase flow facility. Slug udenvelopes were developed for the pipeline-riser system, the udvertical and the horizontal pipes. The results revealed three uddistinct slug flow behaviours. The first type of slug was formed udin the horizontal pipeline and transported through the riser pipe udnearly unchanged, the second type of slugs were formed in the udhorizontal pipe but also experience growth in the riser pipe udwhile the third are slugs formed in the vertical pipe without the udinfluence of the upstream horizontal pipe. udThere is therefore the need to develop appropriate slug control udstrategies based on the observed behaviour of the identified udregions
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