THE STABILITY OF FLUID PRODUCTION FROM A FLEXIBLE RISER

摘要

The prediction of slug formation and slug size has a direct impact on the design of topsides separation facilities and flow assurance to the process. The characteristics and stability of liquid production from an s-shaped riser have been studied over a range of pressures focusing on the implications for flow management. Severe slugging in an s-shaped riser gives a period of no liquid production, followed by a period of steady production and finally a large production spike, many times larger than the steady production. In contrast with classical severe slugging in a vertical or catenary riser, the transient spike is broken into two parts as a direct consequence of the bend in the line. Little attention has been paid to transition-type flows (between stable and unstable flow) previously. Data collected to date has shown transition flows with slugs larger than the riser and production peaks that are greater than classical severe slugs.