SPE Projects, Facilities & Construction
Volume 5, Number 3, September 2010, pp. 136-144

SPE-124057-PA

Prediction of Slug Frequency for High-Viscosity Oils in Horizontal Pipes

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DOI  More information 10.2118/124057-PA http://dx.doi.org/10.2118/124057-PA

Citation

  • Gokal, B., Al-Sarkhi, A.S., Sarica, C., and Al-Safran, E.M. 2010. Prediction of Slug Frequency for High-Viscosity Oils in Horizontal Pipes. SPE Proj Fac & Compl  5 (3): 136-144. SPE-124057-PA. doi: 10.2118/124057-PA.

Discipline Categories

  • 5.6 Multiphase Flow in Wells
  • 4.5 Pipelines, Flowlines and Risers
  • 4.8.3 Flow Assurance in Subsea Systems
  • 4.5.2 Pipeline Transient Behavior (Water Hammer, Slug Prediction)

Keywords

  • Multiphase flow in pipeline, Heavy oil, Slug flow

Summary

Slug frequency is defined as the number of slugs passing at a specific point along a pipeline over a certain period of time. Most experimental studies related to slug frequency in the literature were conducted using air and water. Data with a viscous liquid phase are scarce. Knowledge of the effect of liquid viscosity on slug flow is crucial to size pipelines and design preprocess equipment. In this study, the effects of high oil viscosity on slug frequency for horizontal pipes are investigated experimentally. The experiments are performed at oil viscosities between 0.181 and 0.589 Pa·s in a horizontal pipe. Experimental results are compared with the existing slug-frequency correlations. Experimental observations reveal that slug frequency appears to be a strong function of liquid viscosity. However, existing slug-frequency closure models do not show any explicit dependency on liquid viscosity. A closure model taking into account viscosity effects for horizontal pipes on slug frequency is proposed. The proposed slug-frequency model is compared against published data. The comparison between the proposed closure model and the limited published data shows that the former is a better alternative than existing correlations for high-viscosity oils. The proposed slug-frequency closure model can improve the performance of the existing mechanistic models for high-viscosity-oil applications.

© 2010. Society of Petroleum Engineers

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History

  • Original manuscript received: 17 August 2009
  • Meeting paper published: 5 October 2009
  • Revised manuscript received: 9 November 2009
  • Manuscript approved: 21 November 2009
  • Published online: 13 September 2010
  • Version of record: 13 September 2010