|
| US3942594 | 11 nov. 1974 | 9 mars 1976 | Drill-Au-Mation, Inc. | Drill pipe monitoring system |
| US3967680 | 1 août 1974 | 6 juil. 1976 | Texas Dynamatics, Inc. | Method and apparatus for actuating a downhole device carried by a pipe string |
| US4224988 | 3 juil. 1978 | 30 sept. 1980 | A. C. Co. | Device for and method of sensing conditions in a well bore |
| US4549431 | 4 janv. 1984 | 29 oct. 1985 | Mobil Oil Corporation | Measuring torque and hook load during drilling |
| US4606415 | 19 nov. 1984 | 19 août 1986 | Texaco Inc. | Method and system for detecting and identifying abnormal drilling conditions |
| US4739655 | 14 janv. 1987 | 26 avr. 1988 | Precision Well Logging, Inc. | Method of automatically determining drilling fluid lag time while drilling a well |
| US4941951 | 27 févr. 1989 | 17 juil. 1990 | Anadrill, Inc. | Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| US5448911 | 18 févr. 1993 | 12 sept. 1995 | Baker Hughes Incorporated | Method and apparatus for detecting impending sticking of a drillstring |
| US6216800 | 24 nov. 1998 | 17 avr. 2001 | J. H. Fletcher & Co., Inc. | In-situ drilling system with dust collection and overload control |
| US6427785 | 21 sept. 2001 | 6 août 2002 | | Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| US6637522 | 6 juil. 2001 | 28 oct. 2003 | J. H. Fletcher & Co., Inc. | Enhanced computer control of in-situ drilling system |
| US7026950 | 27 févr. 2004 | 11 avr. 2006 | Varco I/P, Inc. | Motor pulse controller |
| US7059427 | 17 sept. 2003 | 13 juin 2006 | Noble Drilling Services Inc. | Automatic drilling system |
| US8042284 | 9 oct. 2007 | 25 oct. 2011 | LG Electronics Inc. | Heating system, drying machine having the heating system, and method of controlling the heating system |
