Production from a Gulf of Mexico well test exhibited a severe slugging behaviour into the riser. The data was analysed to determine the cause of several major flow rate decreases which caused the severe slugging. Based on the measurements, a restriction downstream of the wellhead, and not the reservoir productivity, could be causing a decline in flow rate which would lead to severe slugging.
This paper discusses the field data analysis to provide an insight into the severe slugging behaviour. In addition, the paper will show the importance of using transient simulators in problem solving of flow assurance issues.