Press Esc to close



For full content view: Log in Now!

  • Shallow hazards planning for deepwater Nigeria

    Enrique Garcia, Jay Akers and Jesse Holster

    The Erha-7 well is a deepwater exploration test that was drilled in 1,074-m water depth within Nigeria’s Offshore Mining License (OML) 133, formerly OPL-209, Fig. 1. During the early well planning process, the site investigation team identified numerous stacked shallow hazards surrounding the well’s geologic targets. These were evaluated by the drill team, the site investigation team and the business unit to optimize the well location and minimize the risk from shallow, gas-charged sands. This article discusses the shallow hazards planning involved, and presents the modeling and evaluation of shallow gas flows and dynamic kills used to quantify the benefits of drilling a pilot hole. Erha Field was discovered in 1999. The Erha-7 well was a near-field wildcat designed to test a prospective hydrocarbon accumulation north of the main field. Site investigation revealed numerous high-amplitude seismic anomalies associated with three different stratigraphic intervals and depths Below the MudLine (BML).

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


Upcoming Events