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| Number | Title | Issue Date |
| 7252151 | Drilling method Methods and apparati are disclosed for continuous circulation of drilling fluids while adding or removing tubulars to and from a drill string, and also for continuing drilling during the addition or removal of tubulars to and from the drill string. ... | 08/07/2007 |
| 7188683 | Drilling method A system and method is disclosed for continuously supplying drilling fluid down a bore hole while adding or removing tubulars. ... | 03/13/2007 |
| 6688394 | Drilling methods and apparatus A method for drilling wells in which the tubular (5) can be added or removed from the drill string (17) whilst the drill is rotating with the mud and drilling fluids being circulated continuously and kept separated from the environment to reduce pollution... | 02/10/2004 |
| 6591916 | Drilling method Methods and apparati are disclosed for continuous circulation of drilling fluids while adding or removing tubulars to and from a drill string, and also for continuing drilling during the addition or removal of tubulars to and from the drill string.... | 07/15/2003 |
| 6315051 | Continuous circulation drilling method A method for drilling wells in which the tubular (5) can be added or removed from the drill string (17) while the drill is rotating with the mud and drilling fluids being circulated continuously and kept separated from the environment to reduce pollution.... | 11/13/2001 |
