| SMOKER, Simon ACTIVE | Secretary | 01 Jan 2016 | | | | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 0NZ, United Kingdom |
| BOYAULT, Gwenola Jacqueline Stephanie ACTIVE | Director | 12 Oct 2016 | | United Kingdom | March 1972 | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 0NZ, United Kingdom |
| MARSH, David ACTIVE | Director | 03 Nov 2016 | | United Kingdom | January 1962 | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 0NZ, United Kingdom |
| SMOKER, Simon ACTIVE | Director | 03 Nov 2016 | | England | July 1962 | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 0NZ, United Kingdom |
| BAUTISTA, Ernesto RESIGNED | Secretary | 09 Jan 2002 | 31 Dec 2008 | | | 24935, Laguna Edge Drive, Katy, Texas, 77396 |
| CRABTREE, Catherine RESIGNED | Secretary | 18 Mar 2005 | 31 Dec 2008 | | | 4614 Evergreen St, Bellaire, Texas 77401, Usa |
| DROY MOORE, Pauline RESIGNED | Secretary | 09 Mar 2012 | 31 Dec 2015 | | | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 ONZ, United Kingdom |
| ELIFF, David Nelson RESIGNED | Secretary | 04 Feb 1999 | 14 Mar 2000 | | | 11606 Mockingbird, Houston, Texas 77024, America |
| HENDRY, Eric George RESIGNED | Secretary | 30 Jan 2012 | 09 Mar 2012 | | | 19, School Road, Newmachar, Aberdeen, AB21 0WB, Scotland |
| TEPERA, Jeffrey RESIGNED | Secretary | 23 Mar 2000 | 18 Mar 2005 | | | 10370 Richmond Avenue, Suite 990, Houston, Texas 77042, Usa |
| BROUGHTON SECRETARIES LIMITED RESIGNED | Secretary | 18 Mar 2005 | 30 Jan 2012 | | | 7, Welbeck Street, London, W1G 9YE, United Kingdom |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Secretary | 02 Feb 1999 | 04 Feb 1999 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |
| BALLARD, Gordon George Reid RESIGNED | Director | 31 Jul 2012 | 30 Jun 2015 | England | November 1959 | Bratton, Beechwood Avenue, Weybridge, Surrey, KT13 9TF, United Kingdom |
| BERG, Jorgen RESIGNED | Director | 01 Apr 2013 | 12 Nov 2014 | United Kingdom | December 1965 | 1, Enterprise Drive, Westhill Industrial Estate, Westhill, Aberdeen, Aberdeenshire, Scotland, AB32 6TQ, Scotland |
| BRUCE, Gordon Alexander RESIGNED | Director | 31 Dec 2008 | 30 Jun 2009 | | January 1945 | 18 Reidford Gardens, Drumoak, Banchory, Kincardineshire, AB31 5AW |
| DUDMAN, Bryan Leigh RESIGNED | Director | 31 Dec 2008 | 16 Mar 2011 | Usa | December 1956 | 5974, Cr 444 Waelder, 78959, Texas, Us |
| HENDRY, Eric George RESIGNED | Director | 30 Jun 2009 | 01 Sep 2012 | United Kingdom | April 1967 | 19, School Road, Newmachar, Aberdeen, AB21 0WB |
| HOEING-COSENTINO, Karin Annette RESIGNED | Director | 01 Dec 2013 | 12 Oct 2016 | Scotland | February 1971 | Schlumberger House, Buckingham Gate, Gatwick Airport, West Sussex, RH6 ONZ, United Kingdom |
| JANNER, Brent Michael RESIGNED | Director | 16 Mar 2011 | 30 Jun 2011 | Usa | October 1970 | 16718, Destrehan, Cypress, Texas 77429, Usa |
| JOHNSTON, Gregory RESIGNED | Director | 08 Mar 2013 | 28 Nov 2014 | United Kingdom | March 1962 | Badentoy Avenue, Badentoy Industrial Park, Portlethen Industrial Estate, Portlethen, Aberdeen, Scotland, AB12 4YB, Scotland |
| KIDD, Ryan Alexander RESIGNED | Director | 12 Nov 2014 | 03 Nov 2016 | Scotland | January 1980 | Schlumberger House, Buckingham Gate, Gatwick Airport, Gatwick, West Sussex, RH6 ONZ, United Kingdom |
| MCALISTER, William Trevor RESIGNED | Director | 16 Mar 2011 | 31 Jul 2012 | United Kingdom | December 1960 | 38, Gladstone Place, Queens Cross, Aberdeen, B10 6XA, United Kingdom |
| STEWART, James Jonathan RESIGNED | Director | 09 Jan 2002 | 20 Apr 2007 | Netherlands | March 1961 | Prinz Hendriklaan 19, 1862 Ek, Bergen Nh, FOREIGN, The Netherlands |
| WHITE JR, Kenneth Trainor RESIGNED | Director | 04 Feb 1999 | 31 Dec 2008 | | December 1941 | 610 Sugar Creek Blvd, Sugarland, Texas 77478, America |
| WRIGHT, John Cook Harper RESIGNED | Director | 31 Jul 2012 | 08 Mar 2013 | United Kingdom | September 1962 | Victory House, Manor Royal, Crawley, West Sussex, RH10 9LU, United Kingdom |
| COMBINED NOMINEES LIMITED RESIGNED | Nominee Director | 02 Feb 1999 | 04 Feb 1999 | | | Victoria House, 64 Paul Street, London, EC2A 4NA |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Director | 02 Feb 1999 | 04 Feb 1999 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |