![]() ![]() The slugging fatigue of a steel lazy wave riser was analyzed in Orcaflex software by modeling a repeating pair of slug and bubble with constant slug and bubble densities and associated lengths over the 3-hour simulation time. By explicitly modeling full spatial and temporal variability and randomness of slugs, the new analysis method is significantly more accurate than other methods and it captures physics of riser's slugging response. Due to local and global weight variations, the riser undergoes cycles of bending which cause fatigue. The variation of slug and bubble density at a location with time is random, and slug characteristics can also change significantly along the riser length. ![]() Under certain flow regimes, a multiphase (oil-gas-water) flow can result in slug flow, in which a sequence of relatively high density slugs and relatively low density bubbles propagate along the flowline and the riser. The objective of this paper is to introduce a new analysis methodology for assessment of riser fatigue due to slugging. ![]()
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