Skip to main content
Article thumbnail
Location of Repository

Characteristics and forces due to slugs in an 'S' shaped riser

By I. A. F. Das

Abstract

The characteristics and forces due to slugs in an 'S' shaped riser have been investigated. A series of experiments were carried out using the Cranfield University Riser Test Facility, using a 9.9m high riser. Single phase (water) and two phase (air and water) tests were conducted at a system pressure of 2 bara. The two phase tests covered a range of flow regimes: severe slugging, transitional severe slugging, oscillation and normal slug flow. The two phase data was used to investigate the characteristics of severe slugging, to determine the liquid inventory in the riser downward limb and, to model the forces on a bend during the slug build-up, production and bubble penetration and gas blowdown stages of the severe slugging cycle. During the bubble penetration and gas blowdown stage, high velocities and large fluctuations in the force were observed. The resultant dynamic forces on the bend during the slug build-up and production stages were small compared to the bubble penetration and gas blowdown stage, and dominated by the hydrostatic forces due to liquid in the riser. Normal slug flow is potentially more problematic in terms of fatigue damage than severe slug flow, due to the higher velocity of the slugs coupled with large dynamic forces

Publisher: Cranfield University
Year: 2003
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/3655
Provided by: Cranfield CERES

Suggested articles

Citations

  1. (1998). A Presentation of Design and Operational Issues Concerning Multiphase Production Systems",
  2. (1993). An Investigation of Severe Slugging Characteristics in Flexible Risers"
  3. Analysis of the Impact Force by a Transient Liquid Slug Flowing Out of a Horizontal Pipe" Nuclear Engineering and Design, Vol 99,1987 doi
  4. (1999). Arvid 0 "Deepwater Riser Technology"
  5. (1999). Big Splash in the Deep Six" The Shield Magazine,
  6. (1998). Challenges in the Mechanical and Hydraulic Aspects of Riser Design for Deep Water Developments"
  7. (2000). Deepwater at the Double" Hart's E&P,
  8. Experimental Study of Severe Slugging in a Two Phase Flow Pipeline-Riser System" doi
  9. (1997). Experimental Study of the Slug Flow Induced Forces on Pipeline Bends" BP Exploration Report,
  10. (1977). Experimental Study of Two-Phase Flow in a Pipeline-Riser Pipe Systenf'
  11. (1997). Gas-Liquid Flow Challenges in Oil and Gas Production"
  12. Measurement of the Forces on Bends in (Oil) Pipelines Due to Multiphase Flow"
  13. (1985). Model Predicts Liquid Accumulation, Severe Terrain Induced Slugging for Two Phase Lines" Oil and Gas Journal,
  14. (1999). Multiphase Flow Behaviour in a Flowline-'S' Shaped Riser System"
  15. (1999). Oil Price Collapse: Fighting the Auld Enemy"
  16. (1999). Predicting, Detecting and Controlling Slugs in Pipeline-Riser Systems"
  17. Program for Improving Multiphase Slug Force Resistance at Kuparuk River Unit Processing Facilities" doi
  18. (2000). rhe Stability of Fluid Production From a Flexible Riser" doi
  19. Severe Slug Flow in offshore Flowline/Riser Systems" doi
  20. (1981). Severe Slugging Characteristics Part I: Flow Regime for Severe Slugging" Selected Topics in Two Phase Flow,
  21. (1991). Severe Slugging in Flexible Risers"
  22. Severe Slugging in Pipeline/Riser Systems" doi
  23. (1998). Slug Flow Momentum Transfer Analysis to Determine the Forces Acting on a 90" Elbow in a Horizontal Line"
  24. (1991). Slug Motion and Impact in a Voided Line" doi
  25. (1999). The Challenges of Developing a Large Deepwater Field"
  26. The Pressure Limit For Terrain Slugging"
  27. The Propulsion of an Isolated Slug Through a Pipe and the Forces Produced as it Impacts Upon an Orifice Plate" doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.