10:00 A. M. June 2, 1986 Mr. Michel Vaillaud Chairman of the Board and Chief Executive Officer Schlumberger Limited 277 Park Avenue New York, New York, 10172 Dear Michel: After considerable thought and with some regret I am writing to you to tender my resianation as a Director of Schlumberger and as a member of the Executive Committee. This decision was not taken lightly. Under the circumstances of my being a gubernatorial candidate in Texas, it is not possible for me to fulfill my obligations as a director in the manner in which I would be comfortable. My time is dedicated 100% to this gubernatorial campaign and, for example, it is not possible for me to attend the Board meeting in Europe in July. If I cannot participate and be active then I should relinquish my directorship to someone who can make that kind of contribution. I have enjoyed my association with you, and the other members of the Board, and you have my every good wish. Reaardst WPC,Jr.:jh Sincerely, William P. Clements, Jr. Copy to: B. Gill Clements