| Patents for E21B 44 - Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions (5,356) |
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| 08/03/1999 | US5931239 Adjustable stabilizer for directional drilling |
| 07/29/1999 | DE19802209A1 Expanding drilling head for pipe channels without trench digging |
| 07/28/1999 | CN2330782Y Intelligent energy-saving controller for oil pumping unit |
| 07/27/1999 | US5929758 Method and apparatus for achieving parallel cable boring |
| 07/27/1999 | US5927408 Head brake release with memory and method of controlling a drill head |
| 07/07/1999 | EP0927892A2 Detection system |
| 07/07/1999 | EP0927294A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 06/30/1999 | EP0906487A4 A system for directional control of drilling |
| 06/22/1999 | US5914602 System including an arrangement for tracking the positional relationship between a boring tool and one or more buried lines and method |
| 06/22/1999 | US5913371 Apparatus for controlling the feed drive of a boring mechanism for making earth bores |
| 06/02/1999 | EP0811111B1 Downhole tool |
| 06/01/1999 | CA2209947C A measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers |
| 05/25/1999 | US5906238 Downhole flow control devices |
| 05/20/1999 | WO1999024688A2 Adjustable stabilizer for directional drilling |
| 05/19/1999 | EP0694114A4 Automatic drilling system |
| 05/06/1999 | EP0913552A2 Method and apparatus for establishing a borehole parallel to an existing underground cable |
| 04/29/1999 | CA2250666A1 Method and apparatus for achieving parallel cable boring |
| 04/22/1999 | WO1999019594A1 Oil tool |
| 04/21/1999 | EP0909876A2 System for transmitting data or electric current for a drilling apparatus |
| 04/21/1999 | CN2315294Y Sensitive probe of log instrument for uneven electric field water holdup |
| 04/21/1999 | CN1214755A Method of regulating drilling conditions applied to well bit |
| 04/21/1999 | CN1214754A Method of assaying downhole occurrences and conditions |
| 04/15/1999 | WO1999000575A3 Drilling system with sensors for determining properties of drilling fluid downhole |
| 04/14/1999 | CA2250323A1 Data transfer system |
| 04/07/1999 | EP0906811A1 Drill hammer |
| 04/07/1999 | EP0906487A1 A system for directional control of drilling |
| 04/03/1999 | CA2248697A1 Rock drill |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/23/1999 | US5884716 Constant bottom contact thruster |
| 03/17/1999 | EP0835360B1 Hydraulic thruster for use in a drill string |
| 02/24/1999 | EP0897454A1 Closed loop fluid-handling system for use during drilling of wellbores |
| 02/03/1999 | CN1206778A Method and apparatus for locating indexing systems in cased well and conducting multilateral branch operations |
| 01/26/1999 | US5864058 Detecting and reducing bit whirl |
| 01/12/1999 | US5857530 Vertical positioning system for drilling boreholes |
| 01/12/1999 | US5857522 Method for separating constituents of a high pressure wellbore fluid |
| 01/07/1999 | WO1999000575A2 Drilling system with sensors for determining properties of drilling fluid downhole |
| 12/30/1998 | EP0887511A1 Method and system for the detection of the precession of a drill string element |
| 12/22/1998 | US5852235 Method and system for real-time estimation of at least one parameter linked with the displacement of a drill bit |
| 12/17/1998 | WO1998057034A1 Method of controlling rock drilling |
| 12/17/1998 | WO1998057033A1 Method of controlling rock drilling |
| 12/17/1998 | CA2293643A1 Method of controlling rock drilling |
| 12/02/1998 | EP0881357A2 Method for controlling the development of an oil or gas reservoir |
| 12/01/1998 | US5844133 Drilling control apparatus of rock drill |
| 12/01/1998 | US5844132 Method and system for real-time estimation of at least one parameter linked with the behavior of a downhole tool |
| 11/24/1998 | US5842149 Closed loop drilling system |
| 11/24/1998 | US5839317 Automated becker hammer drill bounce chamber energy monitor |
| 11/17/1998 | US5838589 For use in a hazardous area |
| 11/17/1998 | US5836406 In a borehole |
| 11/11/1998 | EP0877148A2 Method for evaluating the power output of a drilling motor under downhole conditions |
| 11/10/1998 | US5833015 Method and apparatus for sinking pipes or cables into a pilot borehole |
| 10/28/1998 | EP0874128A2 Rotary drill bit having movable formation-engaging members |
| 10/22/1998 | WO1998046856A1 Drilling assembly with reduced stick-slip tendency |
| 10/17/1998 | CA2223675A1 Automated quarry operation with communication interface |
| 10/14/1998 | EP0870899A1 Drilling assembly with reduced stick-slip tendency |
| 10/13/1998 | US5820350 Method and apparatus for controlling downhole rotary pump used in production of oil wells |
| 10/11/1998 | CA2234745A1 Underground mining drill rig |
| 10/01/1998 | WO1998042481A1 Arrangement in rock drill and method of controlling rock drilling |
| 10/01/1998 | CA2285971A1 Arrangement in rock drill and method of controlling rock drilling |
| 09/22/1998 | US5812068 Drilling system with downhole apparatus for determining parameters of interest and for adjusting drilling direction in response thereto |
| 09/15/1998 | US5806611 For drilling a borehole in an earth formation |
| 09/09/1998 | EP0863293A2 Method and apparatus for controlling the push mechanism of an earth drilling rig |
| 09/09/1998 | EP0862682A2 Autonomous downhole oilfield tool |
| 09/09/1998 | CN1192796A Adjustable stablizer for directional drilling |
| 09/09/1998 | CN1192793A Improved auger piling |
| 09/04/1998 | CA2231208A1 Apparatus for remote measurement of earth well in-bore and well-site conditions |
| 09/02/1998 | EP0861966A2 Apparatus and method for forming ducts and passageways |
| 08/27/1998 | WO1998022689A3 Whipstock |
| 08/18/1998 | US5794724 For drilling openings in concrete and related materials |
| 08/18/1998 | US5794720 Method of assaying downhole occurrences and conditions |
| 08/12/1998 | EP0857249A2 Closed loop drilling system |
| 08/06/1998 | WO1998034007A1 Tool and method for drilling a lateral well |
| 08/04/1998 | US5787978 Multi-face whipstock with sacrificial face element |
| 07/23/1998 | WO1998012418A3 Autonomous downhole oilfield tool |
| 07/23/1998 | EP0862682A3 Autonomous downhole oilfield tool |
| 07/22/1998 | CN1188178A Small controlling equipment for underground job |
| 07/16/1998 | WO1998017894A3 Drilling system with integrated bottom hole assembly |
| 07/15/1998 | CN1187573A Random real-time operational failure monitoring method and device for beam-pumping unit with sucker rod |
| 07/14/1998 | US5778990 Arrangement in a hydraulically operated rock drilling equipment |
| 07/14/1998 | US5778988 Drilling apparatus |
| 07/01/1998 | CN1038957C Wireless automatic orietation system attached to drills |
| 06/30/1998 | US5771981 Control system for percussion drill |
| 06/17/1998 | EP0847479A1 Method and device for drilling |
| 06/16/1998 | US5767671 Method of testing the lifeline of coiled tubing |
| 06/04/1998 | WO1998023848A1 Method and arrangement for controlling feed in rock drilling |
| 06/04/1998 | WO1998023847A1 Arrangement for supporting rock drilling apparatus |
| 06/02/1998 | US5758539 Logging method and system for measuring mechanical parameters of the formations crossed through by a borehole |
| 05/28/1998 | WO1998022693A1 Drilling device |
| 05/28/1998 | WO1998022689A2 Whipstock |
| 05/26/1998 | US5757190 System including an arrangement for tracking the positional relationship between a boring tool and one or more buried lines and method |
| 05/20/1998 | EP0842329A1 Improved auger piling |
| 05/19/1998 | US5752572 Tractor for remote movement and pressurization of a rock drill |
| 05/13/1998 | CN1181450A Intelligent management system of oil field extracting |
| 05/06/1998 | CN2280604Y Driving device of electric tool |
| 05/05/1998 | US5746278 Apparatus and method for controlling an underground boring machine |
| 04/30/1998 | WO1998017894A2 Drilling system with integrated bottom hole assembly |
| 04/23/1998 | WO1998016720A1 Constant bottom contact thruster |
| 04/23/1998 | WO1998016712A1 Apparatus and method for drilling boreholes |
| 04/22/1998 | EP0836670A2 Method and system for logging mechanical parameters of formations crossed through by a borehole |
| 04/15/1998 | EP0835360A1 Hydraulic thruster for use in a drill string |
| 03/26/1998 | WO1998012418A2 Autonomous downhole oilfield tool |