|
| US4150568 | 28 Mar 1978 | 24 Apr 1979 | General Electric Company | Apparatus and method for down hole vibration spectrum analysis |
| US4189012 | 30 Jan 1978 | 19 Feb 1980 | Smith International, Inc. | Earth boring tool |
| US4773263 | 28 Aug 1986 | 27 Sep 1988 | Schlumberger Technology Corporation | Method of analyzing vibrations from a drilling bit in a borehole |
| US5141061 | 30 Nov 1990 | 25 Aug 1992 | Societe Nationale Elf Aquitaine (Production) | Method and equipment for drilling control by vibration analysis |
| US5245871 | 13 Jul 1992 | 21 Sep 1993 | Societe Nationale Elf Aquitaine (Production) | Process for controlling a drilling operation |
| US5273122 | 20 Nov 1992 | 28 Dec 1993 | Elf Aquitaine Production | Automatic method for monitoring the vibrational state of a drill string |
| US5448911 | 18 Feb 1993 | 12 Sep 1995 | Baker Hughes Incorporated | Method and apparatus for detecting impending sticking of a drillstring |
| US5721376 | 1 Apr 1996 | 24 Feb 1998 | Institut Francais du Petrole | Method and system for predicting the appearance of a dysfunctioning during drilling |
| US6065332 | 6 May 1997 | 23 May 2000 | Halliburton Energy Services, Inc. | Method and apparatus for sensing and displaying torsional vibration |
| US6166654 | 16 Apr 1998 | 26 Dec 2000 | Shell Oil Company | Drilling assembly with reduced stick-slip tendency |
| US6227044 | 24 Sep 1999 | 8 May 2001 | Camco International (UK) Limited | Methods and apparatus for detecting torsional vibration in a bottomhole assembly |
| US6631772 | 21 Aug 2001 | 14 Oct 2003 | Halliburton Energy Services, Inc. | Roller bit rearing wear detection system and method |
| US6634441 | 21 Aug 2001 | 21 Oct 2003 | Halliburton Energy Services, Inc. | System and method for detecting roller bit bearing wear through cessation of roller element rotation |
| US6648082 | 26 Oct 2001 | 18 Nov 2003 | Halliburton Energy Services, Inc. | Differential sensor measurement method and apparatus to detect a drill bit failure and signal surface operator |
| US6691802 | 26 Oct 2001 | 17 Feb 2004 | Halliburton Energy Services, Inc. | Internal power source for downhole detection system |
| US6712160 | 26 Oct 2001 | 30 Mar 2004 | Halliburton Energy Services Inc. | Leadless sub assembly for downhole detection system |
| US6722450 | 26 Oct 2001 | 20 Apr 2004 | Halliburton Energy Svcs. Inc. | Adaptive filter prediction method and system for detecting drill bit failure and signaling surface operator |
| US6817425 | 26 Oct 2001 | 16 Nov 2004 | | Mean strain ratio analysis method and system for detecting drill bit failure and signaling surface operator |
| US7044242 | 26 Apr 2002 | 16 May 2006 | Halliburton Energy Services, Inc. | Roller cone bits with reduced packing |
| US7082821 | 15 Apr 2003 | 1 Aug 2006 | Halliburton Energy Services, Inc. | Method and apparatus for detecting torsional vibration with a downhole pressure sensor |
| US7357197 | 17 Oct 2001 | 15 Apr 2008 | Halliburton Energy Services, Inc. | Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface |
