Schlumberger Announces Third-Quarter 2011 Results Conference Call

Schlumberger Limited (NYSE:SLB) will hold a conference call on October
21, 2011 to discuss the results for the third quarter ending September
30, 2011.

The conference call is scheduled to begin at 3:00 pm (Paris time) ? 9:00
am (US Eastern Time). A press release regarding the third quarter 2011
results will be released prior to the call on that same day.

To access the conference call, listeners should contact the Conference
Call Operator at +1-800-230-1059 within North America or +1-612-234-9959
outside of North America approximately 10 minutes prior to the start of
the call, and ask for the 'Schlumberger Earnings Conference Call.?

A webcast of the conference call will be broadcast simultaneously at www.slb.com/irwebcast
on a listen-only basis. Listeners should log in 15 minutes prior to the
start of the call to test their browsers and register for the webcast.
Following the end of the conference call, a replay will be available at www.slb.com/irwebcast
until November 21, 2011, 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 211522.

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 110,000 people
representing over 140 nationalities and working in approximately 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 $27.45 billion in 2010. For more
information, visit www.slb.com.

Schlumberger Limited

Malcolm Theobald, +1 (713) 375-3535

Vice
President of Investor Relations

or

Joy V. Domingo, +1 (713)
375-3535

Manager of Investor Relations

investor-relations@slb.com