Dynamic Processes of Multiphase Flow in Subsea Flowline/Riser Systems During ESD Valve Shut Down

Chin, Y. Doreen; Xu, Zeng-Gang

doi:10.2118/69418-ms

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…They had special discussions on mass and momentum equations for 1D and 2D flows, numerical solutions for 1D and 2D problems, wall shear-stress models, turbulence models, boundary conditions, and future practical and research needs concerning water hammer. Chin and Xu (2001) demonstrated the use of transient multiphase-flow analyses in the design of a deepwater production system (i.e., by means of simulations of the subsea high-intensity pressure-protection system and emergency shutdown with support of field case studies). Wang et al (2008) studied the water hammer in water injectors with a field trial in which pressure pulses generated from rapid shut-ins at different well depths in a soft-formation case and a perforated water injector, respectively, were recorded.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Multiphase Fluid-Hammer Effects During Well StartUp and Shut-In

Han

Ling

Khor

et al. 2013

Oil and Gas Facilities

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Section: Introductionmentioning

confidence: 99%

Simulation of Multiphase Fluid-Hammer Effects During Well StartUp and Shut-In

Han

Ling

Khor

et al. 2013

Oil and Gas Facilities

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“…The simulation techniques enable specific operation guidelines to be formulated by reviewing time-dependent temperature and pressure predictions along the entire length of the pipeline [2,3].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Insulation Techniques on Transient Multiphase Flow Characteristics of Deepwater Catenary Risers

Chin

Krishnathasan

2001

All Days

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For deepwater production, the pipeline/riser system operates in a high external pressure and low seabed temperature environment, facing a high risk of hydrate formation and paraffin deposition. The leading passive strategy for flow assurance is to maintain the well stream temperature beyond the hydrate/paraffin formation zone by minimizing the system heat loss via insulation. Identification of current and new insulation methods that meet technical and commercial demands is a principle issue for deepwater field development.This paper investigates the effect of different insulation scenarios on the transient characteristic of oil/gas/water multiphase flow in deepwater catenary risers. Numerous insulation techniques are available for flow assurance in these pipeline/riser systems. This paper presents a systematic study of risers with the pipe-in-pipe configurations and different insulation materials and with an external insulation material. This study also clarifies the impact of insulation techniques on multiphase up-flow crude in the riser and discusses the phenomena based on the fundamentals of multiphase flow and heat transfer.Numerical transient analyses were conducted to simulate the system shut-in conditions. The effects of insulation scenarios on the temperature, pressure, and liquid holdup responses during the system cool down conditions are investigated. The results of this study will enhance the understanding of multiphase flow transient behavior in insulated deepwater pipeline/riser systems.

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Simulation of Multiphase Fluid-Hammer Effects during Well Shut-In and Opening

Han

Ling

Khor

et al. 2012

SPE Asia Pacific Oil and Gas Conference and Exhibition

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In this study, a transient multiphase simulator has been used to characterize the fluid-hammer effects of well shut-in and start-up on the coupled subsurface and surface systems. The original work was performed by applying sensitivity analysis on a typical production system that includes well completion, wellbore, downhole equipment like packer etc., and the associated surface equipment like flowline, riser and valves. The data used in the study was taken from the published literature to summarize the general course of key factors that worsen the fluid-hammer effects. Fluid-hammer is also known as water hammer, a shock wave produced by the sudden stoppage or reduction in fluid flow. Field operations such as pressure transient analysis, facility maintenance and workover require well shut-in process. For a typical production system, the resulted sudden rises in pressure can be critical because it has direct impact on equipment including unsetting of packer and may also cause possible damages to instrumentations. This paper provides estimates of the typical ratio of transient shock in pressure and flowrate over pre-condition values, and the duration of such pressure shocks. It also proposes the best location of the shut-in valve and the length of flowline to reduce the fluid-hammer effects. This is a pioneering approach to integrate multiphase flow modeling of transient fluid-hammer effects, targeting flow assurance issues. This approach also can be applied to surface facility design and served as guidance in field operation to avoid hydrocarbon leaks.

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Dynamic Processes of Multiphase Flow in Subsea Flowline/Riser Systems During ESD Valve Shut Down

Cited by 3 publications

References 4 publications

Simulation of Multiphase Fluid-Hammer Effects During Well StartUp and Shut-In

Simulation of Multiphase Fluid-Hammer Effects During Well StartUp and Shut-In

Impacts of Insulation Techniques on Transient Multiphase Flow Characteristics of Deepwater Catenary Risers

Simulation of Multiphase Fluid-Hammer Effects during Well Shut-In and Opening

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