Severe slugging phenomenon and a novel method for its mitigation based on the Surface Jet Pump technology
Master thesis
Permanent lenke
http://hdl.handle.net/11250/299846Utgivelsesdato
2015-06-29Metadata
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Sammendrag
The present thesis is focused on the problem of severe slugging and ways to mitigate it. Severe
slugging is an oscillatory multiphase flow regime characterized by high variations in
production rates occurring in offshore pipeline-riser systems.
Chapter 1 provides basic notions related to multiphase flow, which are essential for
understanding of the rest of the thesis.
Chapter 2 gives a thorough description of the severe slugging occurrence mechanism and
preconditions as well as introduces different types of the phenomenon. Special attention is
given to the effect of mass transfer and how it alters the flow regime’s behavior. Detrimental
effects of severe slugging are discussed and some examples are provided.
Chapter 3, making a significant part of the thesis, provides its reader with carefully gathered
data concerning severe slugging alleviation and mitigation methods published from 1973 to
2015, both conventional and purely speculative methods are discussed. Examples, where
possible, are given.
Chapter 4 considers modeling of severe slugging in a vertical riser with aids of the multiphase
simulation program OLGA. A constructed study case is considered and described with some
of the mitigation techniques implemented and tested.
Chapter 5 evaluates a novel severe slugging mitigation method proposed by Caltec Ltd. UK.
The method assumes pipeline system depressurization by installation of a Surface Jet Pump on
the production platform. The chapter gives the method description and verifies its feasibility
using a simulation model within OLGA.
The thesis ends with Conclusions and Recommendations for further work and self-evaluation.
Beskrivelse
Master's thesis in Offshore technology : industrial asset management