| 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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| 06/21/1989 | CN1033471A Autocontrol apparatus for preventing "dry drilling" |
| 06/14/1989 | EP0320135A1 Method and apparatus for operating equipment in a remote location |
| 05/24/1989 | EP0316985A1 A method of monitoring the drilling operations by analysing the circulating drilling mud |
| 05/02/1989 | US4825962 Drilling system |
| 04/25/1989 | CA1253231A1 Method of analyzing vibrations from a drilling bit in a borehole |
| 04/18/1989 | US4821815 Technique for providing an underground tunnel utilizing a powered boring device |
| 04/11/1989 | US4819746 Reverse circulation down-the-hole hammer drill and bit therefor |
| 04/06/1989 | WO1989002973A1 Automatic drilling system |
| 03/22/1989 | EP0308327A1 Method for determining the wear of a tool cutter while drilling rock formations |
| 03/08/1989 | EP0141749B1 Method for remote control with a direct view of a machine on the yard and transmitter-receiver arrangement adapted for carrying it out |
| 03/07/1989 | US4809791 Removal of rock cuttings while drilling utilizing an automatically adjustable shaker system |
| 03/07/1989 | CA1250826A1 Assessment of drilling conditions |
| 02/14/1989 | US4804051 Method of predicting and controlling the drilling trajectory in directional wells |
| 01/25/1989 | EP0300080A1 Device for drilling through cappings |
| 01/17/1989 | CA1248937A1 Rock drill with tunnel profile control system |
| 01/11/1989 | EP0298537A2 Device and method for underreaming a borehole |
| 01/11/1989 | CN2030651U Automatic levelling depth-measuring instrument for toothwheel drill |
| 12/27/1988 | US4794535 Method for determining economic drill bit utilization |
| 12/27/1988 | US4794534 Method of drilling a well utilizing predictive simulation with real time data |
| 12/27/1988 | US4793421 Programmed automatic drill control |
| 12/20/1988 | US4791998 Method of avoiding stuck drilling equipment |
| 12/13/1988 | CA1246731A1 Method for estimating formation characteristics of exposed bottomhole formation |
| 12/08/1988 | DE3730372C1 Method and device for the control of the movement of a drill carriage |
| 12/07/1988 | EP0293767A2 Computer-controlled model for determining internal friction angle, porosity, and fracture probability |
| 11/22/1988 | US4785895 Drill bit with wear indicating feature |
| 11/22/1988 | US4785894 Apparatus for detecting drill bit wear |
| 11/22/1988 | CA1245212A1 Method and system of drilling deviated wellbores |
| 11/02/1988 | EP0289068A1 Procedure for measuring the rate of penetration of a drill bit |
| 11/02/1988 | EP0288527A1 Earth boring apparatus |
| 10/26/1988 | EP0288123A2 Downhole drilling motor |
| 10/04/1988 | US4775017 Drilling using downhole drilling tools |
| 09/29/1988 | DE3708616A1 Tie-drilling apparatus |
| 09/27/1988 | US4773263 Method of analyzing vibrations from a drilling bit in a borehole |
| 09/07/1988 | CN88212727U Safety drilling installation |
| 09/06/1988 | US4768598 Fluid pressure actuated bypass and pressure indicating relief valve |
| 08/23/1988 | US4765415 For increasing the drilling rate and drilling kife of a drill bit |
| 08/16/1988 | US4763734 Earth drilling method and apparatus using multiple hydraulic forces |
| 08/03/1988 | EP0276724A2 Core drilling tool with a direct drive |
| 08/02/1988 | US4760735 Method and apparatus for investigating drag and torque loss in the drilling process |
| 07/26/1988 | US4759214 Method for determining fracture toughness of rock by core boring |
| 07/13/1988 | EP0274207A1 Method for monitoring the operations of the rotary drilling of a well |
| 07/07/1988 | DE3642694A1 Drilling rig |
| 07/05/1988 | US4755805 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 06/14/1988 | US4750561 Gravel packing system for a production radial tube |
| 05/31/1988 | US4748563 Have invented certain new and useful improvements in method and apparatus for controlling the lift travel of a mast or derrick |
| 05/31/1988 | US4747303 Method determining formation dip |
| 05/31/1988 | CA1237422A1 Method of and device for adjusting the feed movement of a drill rod for drilling a rock |
| 05/25/1988 | CN87107391A Multiple functional auto controller for safety well drilling |
| 05/11/1988 | EP0266386A1 Improvements in drilling using downhole drilling tools. |
| 05/05/1988 | WO1988003221A1 Earth boring apparatus |
| 05/04/1988 | CN87208285U Fixing device for torque transducer with rotating disc |
| 04/27/1988 | EP0265401A2 Damping device for a percussion rock drilling machine |
| 04/13/1988 | EP0263644A2 Method for investigating drag and torque loss in the drilling process |
| 04/13/1988 | CN87106795A Boring apparatus |
| 04/07/1988 | WO1988002435A1 Boring apparatus |
| 04/05/1988 | CA1234874A1 Direct view remote control method for workings machine and transmitter and receiver assembly for carrying out such method |
| 03/29/1988 | US4733733 Method of controlling the direction of a drill bit in a borehole |
| 03/08/1988 | CA1233668A1 Torque measuring device |
| 02/11/1988 | DE3626445A1 Method for controlling drilling machines |
| 01/26/1988 | US4721172 Apparatus for controlling the force applied to a drill bit while drilling |
| 01/20/1988 | EP0253477A1 Arrangement for the detection of high voltages |
| 01/12/1988 | CA1231448A1 Drilling monitor |
| 12/29/1987 | US4715128 Curvature probe and method |
| 12/23/1987 | EP0250059A2 Method for determining fracture toughness of rock by core boring |
| 12/15/1987 | US4712624 Rock drill with tunnel profile control system |
| 12/08/1987 | US4711090 Method of and device for adjusting the feed movement of a drill rod for drilling a rock |
| 11/25/1987 | EP0246865A2 Method of and apparatus for providing an underground tunnel |
| 11/24/1987 | US4708212 Method and apparatus for optimizing determination of the originating depth of borehole cuttings |
| 11/10/1987 | CA1229081A1 Method for optimizing rock drilling |
| 11/03/1987 | US4703664 Fluid flow measurement system sensor mounting block |
| 10/22/1987 | WO1987006300A1 Improvements in drilling using downhole drilling tools |
| 10/22/1987 | DE3610792A1 Electrohydraulic control for a casing machine for cased bores in the ground |
| 10/06/1987 | US4697650 Method for estimating formation characteristics of the exposed bottomhole formation |
| 09/29/1987 | US4696352 Metal carbides, nitrides, oxides; coal, concrete, masonry, rocks; |
| 09/22/1987 | US4695957 Drilling monitor with downhole torque and axial load transducers |
| 09/15/1987 | US4693327 Earth well drilling apparatus |
| 08/19/1987 | EP0233038A2 Down-the-hole-drill |
| 08/12/1987 | CN85202160U Electromechanic controlling anti-bumping crown block |
| 08/11/1987 | US4685329 Assessment of drilling conditions |
| 08/11/1987 | US4685294 Viscosity-temperature compensator for hydraulic systems |
| 07/14/1987 | US4679489 Automatic leveling system for blast hole drills and the like |
| 07/01/1987 | EP0227456A2 Earth well drilling apparatus |
| 06/10/1987 | CN86105356A Hydraulic control system for well tools |
| 06/09/1987 | US4671366 Method for optimizing rock drilling |
| 06/02/1987 | CA1222505A1 Targetable drill with pressure telemetering of drill parameters |
| 05/26/1987 | CA1222203A1 Measuring torque and hook load during drilling |
| 05/05/1987 | US4662608 Automatic drilling control system |
| 05/05/1987 | US4662458 Method and apparatus for bottom hole measurement |
| 04/28/1987 | US4660656 Method and apparatus for controlling the rotational torque of a drill bit |
| 04/15/1987 | EP0218328A2 Methods of analyzing vibrations from a drilling bit in a borehole |
| 03/11/1987 | CN85103274A Dynamic monitoring and controlling method for drill head falling of a shaft-well driller |
| 01/21/1987 | EP0209343A2 Method of avoiding a drill string becoming stuck during drilling |
| 01/14/1987 | CN86104849A Process for avoiding the equipment of well-drilling to block up in the well |
| 12/09/1986 | US4627276 Method for measuring bit wear during drilling |
| 12/03/1986 | EP0203282A1 Control of a hydraulic percussive drilling device |
| 12/02/1986 | CA1214768A1 Hydraulic piston-effect method and apparatus for forming a bore hole |
| 10/21/1986 | US4618008 Vertical drilling method and apparatus |
| 10/07/1986 | US4616321 Drilling rig monitoring system |
| 10/07/1986 | US4615401 Automatic hydraulic thruster |
| 07/22/1986 | US4601354 Means and method for facilitating measurements while coring |