A New Discrete Slug-Flow Controller for Production Pipeline Risers

Stasiak, Marina Enricone; Pagano, Daniel J.; Plucenio, Agustinho

doi:10.3182/20120531-2-no-4020.00032

Cited by 11 publications

(1 citation statement)

References 8 publications

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“…Nevertheless, due to the restriction caused by choking, oil production could be significantly reduced by fixed choking (Havre, Stornes and Stray, 2000). Some automatic control strategies have been reported for severe slug mitigation (Havre et al, 2000;Havre and Dalsmo, 2001;Siahaan et al, 2005;Di Meglio et al, 2012;Stasiak et al, 2012;Ogazi et al, 2009Ogazi et al, , 2010Henriot et al, 1999;Godhavn et al, 2005;Storkaas and Skogestad, 2004). However, it is difficult to use a choke valve to eliminate severe slugging without reducing the production rate.…”

Section: Introductionmentioning

confidence: 99%

Severe slug mitigation in an S-shape pipeline-riser system by an injectable venturi

Inok

Lao

Cao

et al. 2019

Chemical Engineering Research and Design

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Severe slugging is a cyclic flow regime that causes pressure, flow and temperature oscillations which leads to an intermittent delivery of liquid (oil and water) and gas to processing facilities during hydrocarbon extraction and transportation. These oscillations can cause separator flooding, production reduction, platform trips and plant shutdown. This paper presents a novel method for severe slug mitigation in a pipeline-riser system which use an injectable venturi coupled to the pipeline-riser system upstream of the topside test separator for severe slug mitigation. Injectable venturi is a venturi tube that has an opening at its throat and a pipe inclined at 45°is inserted into this opening. Gas is injected through the pipe counter to the flow coming from upstream of the injectable venturi to choke the working fluid passing through the throat of the injectable venturi. Flow regimes maps, stability maps, severe slug envelopes and Hopf bifurcation maps were generated and used to demonstrate the performance of the injectable venturi in mitigating severe slugging in a pipeline-riser system. A similar experiment was conducted with the injectable venturi with no gas injection and the plain riser (without the injectable venturi coupled). The results from the experiment show that with the injectable venturi coupled to the pipeline-riser system, severe slugging was mitigated, the severity of severe slugging was reduced, the operating region of severe slugging (severe slug envelop) was reduced and stability was achieved at a larger valve opening. Practically, these results imply that oil and gas production can proceed more smoothly, thus, enhancing flow assurance. The injectable venturi with gas injection gave a better performance than with no gas injection. Thus, the effectiveness of the injectable venturi is not due to the venturi itself, but due to gas injection at the throat of the venturi.

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