|
| US4520468 | 28 May 1982 | 28 May 1985 | | Borehole measurement while drilling systems and methods |
| US4807717 | 30 Oct 1987 | 28 Feb 1989 | Amoco Corporation | Method of loggging an inclined wellbore |
| US6269891 | 9 Sep 1999 | 7 Aug 2001 | Shell Oil Company | Through-drill string conveyed logging system |
| US7134493 | 8 Mar 2002 | 14 Nov 2006 | Shell Oil Company | Logging system for use in a wellbore |
| US7140454 | 5 Jul 2002 | 28 Nov 2006 | Shell Oil Company | Well drilling bit |
| US7188672 | 23 Apr 2004 | 13 Mar 2007 | Shell Oil Company | Well string assembly |
| US7207398 | 16 Jul 2002 | 24 Apr 2007 | Shell Oil Company | Steerable rotary drill bit assembly with pilot bit |
| US7281592 | 23 Jul 2002 | 16 Oct 2007 | Shell Oil Company | Injecting a fluid into a borehole ahead of the bit |
| US7287609 | 13 Nov 2003 | 30 Oct 2007 | Shell Oil Company | Drilling a borehole |
| US7296639 | 14 Jan 2004 | 20 Nov 2007 | Shell Oil Company | Wellstring assembly |