Schlumberger 2011 Annual Report - page 99

Exhibit 24
Power of Attorney
Each of the undersigned, in the capacity or capacities set forth below his or her signature as a member of the Board
of Directors and/or an officer of Schlumberger Limited, a Curaçao corporation (“the Corporation”), hereby appoints
Simon Ayat, Howard Guild and Alexander C. Juden, or either of them, the attorney or attorneys of the undersigned,
with full power of substitution and revocation, for and in the name, place and stead of the undersigned to execute and
file with the Securities and Exchange Commission the Annual Report on Form 10-K under the Securities Exchange Act
of 1934 (the “Exchange Act”) for the fiscal year ending December 31, 2011, and any amendment or amendments to any
such Annual Report on Form 10-K, and any agreements, consents or waivers relative thereto, and to take any and all
such other action for and in the name and place and stead of the undersigned as may be necessary or desirable in order
to comply with the Exchange Act or the rules and regulations thereunder.
/s/ Philippe Camus
Philippe Camus
/s/ Adrian Lajous
Adrian Lajous
/s/ Peter L.S. Currie
Peter L.S. Currie
/s/ Michael E. Marks
Michael E. Marks
/s/ Andrew Gould
Andrew Gould
Chairman and Executive Officer
/s/ Elizabeth Moler
Elizabeth Moler
/s/ Tony Isaac
Tony Isaac
/s/ Lubna S. Olayan
Lubna S. Olayan
/s/ K.V. Kamath
K.V. Kamath
/s/ Leo Rafael Reif
Leo Rafael Reif
/s/ Paal Kibsgaard
Paal Kibsgaard
Director and Chief Executive Officer
/s/ Tore Sandvold
Tore Sandvold
/s/ Nikolay Kudryavtsev
Nikolay Kudryavtsev
/s/ Henri Seydoux
Henri Seydoux
Date: January 19, 2012
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