Press Esc to close



For full content view: Log in Now!

  • Effective riser tension: Fact or fiction

    J. H. Bayless

    The author, with 44 years of industry experience, analyses complex oilfield practices using elementary physics. When a conflict with these basics is evident, he points that out so that improved practices can be developed. This second article – following “Important basic facts regarding riser tension and mud weight,” World Oil, August 2001 – also deals with a complex subject – riser analysis – in an effort to dispel commonly held beliefs that do not comply with elementary physics. Effective tension. The physical model: For more than 30 years, analysts have used, as a basis for fundamental forces on risers, the concept illustrated in the accompanying figure. The drawing shows: A) a straight riser loaded with heavy mud; B) the same riser with a slight displacement due to a temporary eddy current or temporary vessel excursion; and C) the same riser with a large displacement due to postulated internally generated forces from the hydrostatic pressure of the mud. Casual examination indicates that the side of the riser to the right is longer than the other side of the risers in the other two scenarios. Thus, it seems plausible that this longer side would have more area than the other side.

This area of the site is restricted. In order to gain access, please either Log In, or subscribe to World Oil.

Two options are available to you for creating an account.

1. Get a Free Trial Subscription to World Oil Magazine and gain immediate access to select content on World Oil Online.

Start a Free Trial Subscription and gain immediate access to the complete current issue of World Oil Magazine. Plus, you’ll receive 3 upcoming issues of World Oil Magazine in print or digital format.* You also receive access to the Energy Events Calendar, Industry Statistics and WO Wire’s news and industry coverage.

Free Trial

2. Purchase a subscription to World Oil magazine and gain immediate and complete access to World Oil Online. As a Total Access subscriber you will have access to all areas of the site available to registered users and free subscribers as well as having access to such premium content areas as:

  • The Archives section containing over ten years of complete magazine archives,
  • The WO DataHub's engineering tables and directories,
  • The World Oil annual forecasts, including past predictions,
  • Select World Oil technical handbooks,
  • And much, much more!


Physical copies of this content may be available for purchase. Visit the Reprints & Back Issues section.

If you are already a paid subscriber and do not have access, please email



Engineering Data Tables

World Oil's specialized upstream Engineering Data Tables featuring the Drill Bit Classifier, Tubing Tables and more. Get Total Access today.


2013 Fracturing Technology

2013 Fracturing Technology