|
| US4060140 | 12 Oct 1976 | 29 Nov 1977 | Halliburton Company | Method and apparatus for preventing debris build-up in underwater oil wells |
| US4099583 | 11 Apr 1977 | 11 Jul 1978 | Exxon Production Research Company | Gas lift system for marine drilling riser |
| US4216834 | 27 Mar 1978 | 12 Aug 1980 | Brown Oil Tools, Inc. | Connecting assembly and method |
| US4291772 | 25 Mar 1980 | 29 Sep 1981 | Standard Oil Company (Indiana) | Drilling fluid bypass for marine riser |
| US4311327 | 20 Dec 1979 | 19 Jan 1982 | Exxon Production Research Company | Universal joint for multiple flowline system |
| US4337970 | 20 Dec 1979 | 6 Jul 1982 | Exxon Production Research Company | Universal joint for multiple conduit system |
| US4524832 | 30 Nov 1983 | 25 Jun 1985 | Hydril Company | Diverter/BOP system and method for a bottom supported offshore drilling rig |
| US4597447 | 11 May 1984 | 1 Jul 1986 | Hydril Company | Diverter/bop system and method for a bottom supported offshore drilling rig |
| US4646844 | 24 Dec 1984 | 3 Mar 1987 | Hydril Company | Diverter/bop system and method for a bottom supported offshore drilling rig |
| US5660241 | 20 Dec 1995 | 26 Aug 1997 | Dowell, a division of Schlumberger Technology Corporation | Pressure compensated weight on bit shock sub for a wellbore drilling tool |
| US6148922 | 12 Nov 1998 | 21 Nov 2000 | Maritime Hydraulics AS | Slip joint |
| US6216799 | 24 Sep 1998 | 17 Apr 2001 | Shell Offshore Inc. | Subsea pumping system and method for deepwater drilling |
| US6527053 | 6 Apr 2001 | 4 Mar 2003 | Norsk Hydro ASA | Arrangement related to riser pipelines |
| US6571873 | 20 Feb 2002 | 3 Jun 2003 | ExxonMobil Upstream Research Company | Method for controlling bottom-hole pressure during dual-gradient drilling |
| US6802379 | 21 Feb 2002 | 12 Oct 2004 | ExxonMobil Upstream Research Company | Liquid lift method for drilling risers |
| US7093662 | 29 Oct 2003 | 22 Aug 2006 | | System for drilling oil and gas wells using a concentric drill string to deliver a dual density mud |
| US7938190 | 2 Nov 2007 | 10 May 2011 | AGR Subsea, Inc. | Anchored riserless mud return systems |
| US7972555 | 16 Oct 2008 | 5 Jul 2011 | ExxonMobil Upstream Research Company | Method for fabricating compressible objects for a variable density drilling mud |
| US8076269 | 16 Oct 2008 | 13 Dec 2011 | ExxonMobil Upstream Research Company | Compressible objects combined with a drilling fluid to form a variable density drilling mud |
| US8088716 | 16 Oct 2008 | 3 Jan 2012 | ExxonMobil Upstream Research Company | Compressible objects having a predetermined internal pressure combined with a drilling fluid to form a variable density drilling mud |
| US8088717 | 16 Oct 2008 | 3 Jan 2012 | ExxonMobil Upstream Research Company | Compressible objects having partial foam interiors combined with a drilling fluid to form a variable density drilling mud |
| USRE43199 | 10 Sep 2002 | 21 Feb 2012 | Ocean Rider Systems AS | Arrangement and method for regulating bottom hole pressures when drilling deepwater offshore wells |
