Schlumberger Releases World’s First In-Riser System with SIL 2 Certification

The New SenTURIAN System Offers Fast-Acting Control and Equipment Verification on Subsea Wells in all Environments

ABERDEEN, September 9, 2009 - Schlumberger announced today at the 2009 SPE Offshore Europe Oil and Gas Conference the release of its SenTURIAN* subsea landing string electrohydraulic operating system. Technological advances have resulted in an innovative, shorter modular system, which allows safe, reliable, and efficient completion installation, well cleanup and well testing from a dynamically positioned vessel in water depths to 15,000 ft (4,572 m).

SenTURIAN is the world's first and only in-riser system designed and certified in accordance with the International Electrotechnical Commission’s IEC 61508 SIL 2 reliability specifications for safety-related systems. IEC is the international standards and conformity assessment body for all fields of electrotechnology. In addition, the design enables compliance with ISO 13628-7 standards by providing electronic redundancy and pressure readout for each subsea function.

"The short and compact system is easy to handle and to operate, which saves rig time," said Shehryar Lodhi, marketing manager, Schlumberger Testing Services. "It delivers reliable verification of equipment integrity and well control with state-of-the-art circuitry and accumulator technology."

SenTURIAN is the first landing string system to use interchangeable mandrels and pressure-balanced accumulators. This unique technological advance allows both subsea control and accumulator modules to be combined in a single assembly, which is 50% shorter than other systems, while providing the tensile strength, pressure rating and hydraulic output needed for operations in shallow to ultra deepwater.

The system was used in the first-ever deepwater well completed offshore India, and on a total of 28 successful completions in India and the Gulf of Mexico.

SenTURIAN operates the family of SenTREE* subsea test trees, tubing hanger running tools, and completion equipment. It enables the closing of all subsea test tree valves and disconnection of a landing string in less than 15 seconds. Qualified to 275 degF (135 degC) and 15,000 psi (1,034 Bar), the system has an interchangeable mandrel to increase the pressure rating above 15,000 psi for project specific requirements.

For additional information, visit www.SLB.com/SenTURIAN.

About Schlumberger
Schlumberger is the world’s leading supplier of technology, integrated project management and information solutions to customers working in the oil and gas industry worldwide. Employing approximately 79,000 people representing over 140 nationalities and working in more than 80 countries, Schlumberger provides the industry’s widest range of products and services from exploration through production.

Schlumberger Limited has principal offices in Paris, Houston and The Hague and reported revenues of $27.16 billion in 2008. For more information, visit www.SLB.com.

For further information, contact:

Susan Ganz
Media Relations Manager
Schlumberger
+1 713 513 2480
sganz1@slb.com