Press Esc to close



For full content view: Log in Now!

  • First use of extended-range EM MWD in offshore, underbalanced drilling

    D. Weisbeck, G. Blackwell, D. Park and C. Cheatham

    The use of EM MWD in offshore applications has been limited, primarily due to the difficulty of seabed deployment of the receiving antenna. In certain underbalanced drilling (UBD) operations, however, EM is the MWD system of choice because mud-pulse telemetry has great difficulty operating in the two-phase flow conditions sometimes used. Repsol-YPF-Maxus successfully used UBD on Krisna Well D12 in offshore Indonesia to prevent massive lost circulation and stuck pipe in the reservoir. Although the vertical depth of the well was relatively shallow (about 4,200 ft subsea), the very low resistivity of the formations above the reservoir precluded use of standard EM MWD services. The extended-range EM MWD system was used to extend the depth capability. This article discusses the planning, results, problems and lessons learned during the first use of the Extended-Range Electromagnetic (EM) MWD system for UBD in an offshore well.

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