SLB Schlumberger Ltd

Schlumberger Limited (NYSE:SLB) will hold a conference call at 9:00 a.m. ET on April 21, 2006 to discuss the results for the first quarter ending on March 31, 2006. The results are expected to be released at 6:00 a.m. ET that same morning. To access the conference call, attendees should contact the conference call operator at +1-888-428-4474 within North America or +1-612-332-0632 outside of North America approximately 10 minutes prior to the call's start time, and ask for the "Schlumberger Earnings Conference Call." A replay of the conference call will be available until May 5, 2006, and can be accessed by dialing +1-800-475-6701 within North America or +1-320-365-3844 outside of North America, and giving the access code 822755. A live webcast of the conference call will be simultaneously broadcast at www.SLB.com/irwebcast on a listen-only basis. Attendees should log in 15 minutes ahead of time to test their browsers and register for the webcast. Following the event, a replay will be available at the same URL until May 5, 2006. About Schlumberger Schlumberger is the world's leading oilfield services company supplying technology, project management, and information solutions that optimize performance in the oil and gas industry. The company employs more than 60,000 people of over 140 nationalities operating in more than 80 countries, and comprises two business segments. Schlumberger supplies a wide range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions and productivity to consulting, software, information management, and IT infrastructure services that support core industry operational processes. WesternGeco, jointly owned with Baker Hughes, is the world's largest seismic company and provides advanced acquisition and data processing services. In 2005, Schlumberger operating revenue was $14.31 billion. For more information, visit www.SLB.com.