Press Esc to close



For full content view: Log in Now!

  • Extreme drilling environment forces evolution of rotary steerable systems and bits

    B. Cox, L. Romo, B. Champion, O. Maung, K. Card and S. Barton

    Wells drilled in the Tuscaloosa Trend near Baton Rouge, Louisiana, have long been recognized for the extreme nature of the High Pressure, High Temperature (HPHT) operating environment and for well control problems. This article describes drilling of the highly abrasive formations in the intermediate and drilling liner sections to depths of ± 20,000 ft. These sections are a major cause of bit, directional tool and drillstring failures. Wells' directional complexity has increased in recent years due to surface location constraints and reservoir compartmentalization. New drills are directional to penetrate multiple stacked targets, fault-out depletion and to adhere to regulatory constraints. Directional control in the intermediate section requires drilling through the abrasive Wilcox formation and risks wellbore drift out of the target. Below the intermediate section, drillers encounter significant directional tool constraints, because temperatures range from 300-400°F. Poor directional response, low penetration rates and increased motor failures have resulted in long and costly sections.

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