Transient Slug Flow Modelling of Subsea Riser Flowline System
Current Journal of Applied Science and Technology,
A gas-water system slug velocity was modelled with slug flow like a train of slug units streaming through a steel flowline riser of roughness 0.025 was modelled, the flowline was 2700 m, and the riser was 100 m with a diameter of 0.254 m, with each slug unit having a liquid slug of 100 m and its gas bubble of 200 m. Presumptuously the liquid phase was not compressible; that is, no gas was entrapped in the liquid; there is also no liquid was trapped within the gas. Unsteady state flow was modelled as a mass-spring system with damping. Liquid phase represented the mass, whereas the gas represented the spring and damping as the force of friction that acts on the fluids in motion by the wall. A quasi-steady-state model having a slug velocity of 4 ms-1 was used to simplify the numerical correlations and algorithm and to relate with outcomes of the unsteady state model. Outputs from both models show that pressure and rate vary sinusoidally at fixed points in the system. Both models are unconcealed that the velocity of every slug unit was most at the end of flowline to the separator. The result from the transient state model is complex for weighing up with other results from the literature. This procedure was as a product of over-simplification owing to some assumptions made. Also, simultaneous solutions to the differential equations were solved with hand. It is determined that quasi-steady-state outputs are more reliable than the unsteady state model for flowlines that are not situated on heaving surfaces because the model is less complicated and follows the predictable trend.
- Slug velocity
- quasi-steady-state model
- unsteady-state model
- gas-water system
How to Cite
Issa R, Kempf M. Simulation of slug flow in horizontal and nearly horizontal pipes with the two-fluid model. International Journal of Multiphase Flow. 2003;29(1):69-95.
Taitel Y, Dukler A. Effect of pipe length on the transition boundaries for high-viscosity liquids. International Journal of Multiphase Flow. 1987;13(4):577-581.
Hazewinkel M. Linear algebra software packages. Encyclopedia of mathematics, springer science + business media B.V. / Kluwer Academic Publishers; 2001.
Matsubara H, Naito K. Effect of liquid viscosity on flow patterns of gas-liquid two-phase flow in a horizontal pipe. International Journal of Multiphase Flow. 2011;37(10):1277-1281.
Barnea D, Shoham O, Taitel Y, Dukler A. Flow pattern transition for gas-liquid flow in horizontal and inclined pipes: comparison of experimental data with theory, International Journal of Multiphase Flow. 1980;6(3):217-225.
Lockett TJ, Fan Y, Ajani A, Advances in modelling hydrodynamic slug flow in production systems, BP Exploration and Production, UK; 2017.
Bonizzi M, Issa R. A model for simulating gas bubble entrainment in two-phase horizontal slug flow. International Journal of Multiphase Flow. 2003;29(11): 1685-1717.
Gregory G, Nicholson M, Aziz K. Correlation of the liquid volume fraction in the slug for horizontal gas- liquid slug flow. International Journal of Multiphase Flow. 1978;4(1):33-39.
Dukler AE, Hubbard MG. A model for gas-liquid slug flow in horizontal and near-horizontal tubes. Industrial & Engineering Chemistry Fundamentals. 1975;14(4):337-347.
Wang Y, Yan C, Sun L, Yan C. Characteristics of slug flow in a vertical narrow rectangular channel. Experimental Thermal and Fluid Science. 2014;53:1-16.
Minami K, Shoham O. Transient two-phase flow behavior in pipelines-experiment and modeling. International Journal of Multiphase Flow. 1994;20(4):739-752.
Wong T, Gilchrist A. A model for transient analysis of gas-liquid slug flow in pipelines of an offshore wellhead. The proceedings of the international offshore and polar engineering conference 1993, International Society of Offshore and Polar Engineers. 1993;142-150.
Cazarez-Candia O, Benítez-Centeno O, Espinosa-Paredes G. Two-fluid model for transient analysis of slug flow in oil wells. International Journal of Heat and Fluid Flow. 2011;32(3):762-770.
Lin P, Hanratty T. Prediction of the initiation of slugs with linear stability theory. International Journal of Multiphase Flow. 1986;12(1):79-98.
Beggs DH, Brill JP. A study of two-phase flow in inclined pipes. Journal of Petroleum Technology. 1973;25(05):607-617.
Carneiro J, Fonseca Jr R, Ortega A, Chucuya R, Nieckele A, Azevedo L. Statistical characterization of two-phase slug flow in a horizontal pipe. Journal of the Brazilian Society of Mechanical Sciences and Engineering. 2011; 33(SPE1):251-258.
De Henau V, Raithby G. A transient two-fluid model for the simulation of slug flow in pipelines—I. Theory. International Journal of Multiphase Flow. 1995;21(3):335-349.
Taitel Y, Shoham O, Brill J. Simplified transient solution and simulation of two-phase flow in pipelines. Chemical Engineering Science. 1989;44(6):1353-1359.
De Henau V, Raithby G. A transient two-fluid model for the simulation of slug flow in pipelines—II. Validation. International Journal of Multiphase Flow. 1995;21(3): 351-363.
Masella J, Tran Q, Ferre D, Pauchon C. Transient simulation of two-phase flows in pipes. International Journal of Multiphase Flow. 1998;24(5):739-755.
Guzmán Vázquez E, Fairuzov YV. A study of normal slug flow in an offshore production facility with a large diameter flowline. SPE Production & Operations. 2009;24(01):171-179.
Wallis GB, Dodson JE. The onset of slugging in horizontal stratified air-water flow. International Journal of Multiphase Flow. 1973;1(1):173-193.
Sarica CT, Shoham O. A simplified transient model for pipeline-riser systems. Chemical Engineering Science. 1991;46: 2167-2179.
Eaton BA, Knowles CR, Silberbrg I. The prediction of flow patterns liquid holdup and pressure losses occurring during continuous two-phase flow in horizontal pipelines. Journal of Petroleum Technology. 1967;19(06)L815-828.
Dukler A, Wicks M, Cleveland R. Frictional pressure drop in two‐phase flow: A. A comparison of existing correlations for pressure loss and holdup. AIChE Journal. 1964;10(1):38-43.
Fabre J, Liné A. Modeling of two-phase slug flow. Annual Review of Fluid Mechanics. 1992;24(1):21-46.
Fernandes R, Semiat R, Dukler A. Hydrodynamic model for gas‐liquid slug flow in vertical tubes. AIChE Journal. 1983;29(6):981-989.
Bendiksen KH, Maines D, Moe R, Nuland S. The dynamic two-fluid model OLGA: Theory and application. SPE production engineering. 1991;6(02):171-180.
Li G, Yao Y, Dong S. Faculty of A physical model for predicting the pressure drop of gas-liquid slug flow in horizontal pipes. Journal of Hydrodynamics, Ser. B. 2007;19(6):736-742.
Reda AM, Forbes GL, Sultan IA. Characterization of dynamic slug flow-induced loads in pipelines, ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering 2012, American Society of Mechanical Engineers. 2012;185-197.
Sagatun S. Riser slugging: A mathematical model and the practical consequences. SPE Production & Facilities. 2004;19(03): 168-175.
Garner B, Petit P, Unnam J. Dynamic simulation of integrated pipeline and process modelsn to investigate slug flow impact on subsea compact separation, Offshore Technology Conference; 2015.
Havre K, Stornes KO, Stray H. Taming slug flow in pipelines. ABB Review. 2000;4:55-63.
Kjeldby T, Henkes R, Nydal O. Lagrangian slug flow modeling and sensitivity on hydrodynamic slug initiation methods in a severe slugging case. International Journal of Multiphase Flow. 2013;53:29-39.
Villalobos A, Espinola-Gonzalez O., Scott-Duran DW, Corsi-Regalado C. Slug flow regime and mitigation using transient simulation, a complete workflow. Trinidad and Tobago section energy resources conference held, 13-16, Port of Spain, Trinidad and Tobago; 2016.
Van Hout R, Barnea D, Shemer L. Evolution of statistical parameters of gas-liquid slug flow along vertical pipes. International Journal of Multiphase Flow. 2001;27(9):1579-1602.
Hill T, Wood D. Slug flow: Occurrence consequences and prediction, University of Tulsa Centennial Petroleum Engineering Symposium 1994, Society of Petroleum Engineers; 1994.
Taitel Y, Lee N, Dukler A. Transient gas‐liquid flow in horizontal pipes: Modeling the flow pattern transitions. AIChE Journal. 1978;24(5):920-934.
Tang Y, Danielson TJ. Pipelines slugging and mitigation: A case study for stability and production optimization, SPE Annual Technical Conference and Exhibition 2006, Society of Petroleum Engineers; 2006.
Abstract View: 980 times
PDF Download: 330 times