| 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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| 12/27/1990 | WO1991000410A1 Device for guiding a drilling tool into a well and for exerting thereon a hydraulic force |
| 12/26/1990 | CN1048076A Method of managing prodn. well |
| 12/25/1990 | US4980681 Direct view remote control method for workings machine and transmitter and receiver assembly for carrying out such method |
| 12/25/1990 | US4979575 Method of drilling a hole-in a rock |
| 12/11/1990 | US4976321 Horizontal earth boring machine and method |
| 12/05/1990 | EP0401119A1 Method for characterising a primary layer |
| 12/04/1990 | US4974690 Adapter for drilling strings with controllable air passage |
| 12/04/1990 | US4974672 Gravel packing system for a production radial tube |
| 11/27/1990 | US4972703 Method of predicting the torque and drag in directional wells |
| 11/14/1990 | CN1010422B Drill pipes and castings utilizing mult-conduit tubulars |
| 10/30/1990 | US4966234 Method for determining the free point of a stuck drillstring |
| 10/24/1990 | EP0372089A4 Method and device for determining the quantity of milk extracted from one cow |
| 10/10/1990 | EP0382852A4 Device for determining the index of productivity and food ration of animals |
| 10/03/1990 | CN1045835A Arrangement in apparatus for breaking thread of drilling apparatus |
| 10/01/1990 | WO1990012195A1 Control device and process for drilling by vibration analysis |
| 09/26/1990 | EP0389289A1 Apparatus for breaking a threaded connection |
| 09/18/1990 | US4958125 Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks |
| 09/12/1990 | EP0386810A2 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 08/29/1990 | EP0384888A1 Drilling device |
| 08/27/1990 | CA2010943A1 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 08/22/1990 | EP0382852A1 Device for determining the index of productivity and food ration of animals |
| 08/21/1990 | US4949795 Rotary rapid excavation system |
| 08/16/1990 | EP0381921A2 Control valve for a counter-blow tapping-hole drill |
| 08/15/1990 | CN1044695A Intelligent weight-indicating meter |
| 07/26/1990 | DE3902127A1 Wagon drill with laser-orientated control |
| 07/17/1990 | US4941951 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 07/11/1990 | EP0377235A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 07/11/1990 | EP0266386B1 Improvements in drilling using downhole drilling tools |
| 07/03/1990 | US4938298 Directional well control |
| 06/26/1990 | US4937747 Iterative disjoint cluster and discriminant function processing of formation log responses and other data |
| 06/13/1990 | EP0372089A1 Method and device for determining the quantity of milk extracted from one cow |
| 06/12/1990 | CA1270113A1 Method for determining formation dip |
| 06/03/1990 | CA2003785A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 05/29/1990 | US4928521 Method of determining drill bit wear |
| 05/22/1990 | US4926950 Method for monitoring the wear of a rotary type drill bit |
| 05/22/1990 | US4926686 Method for determining the wear of the cutting means of a tool during drilling a rocky formation |
| 05/09/1990 | EP0367240A1 Adaptor for drilling strings with a controllable air passage |
| 05/02/1990 | CN2056696U Multi-point displacement metre for drilling hole |
| 05/01/1990 | US4922423 Position and seal wear indicator for valves and blowout preventers |
| 04/12/1990 | DE3903302C1 Drilling appliance |
| 03/21/1990 | EP0324778A4 Boring apparatus. |
| 03/21/1990 | CN1040653A Apparatus for avoiding stuck drilling equipment and method of determining probability of unsticking stuck drill pipe |
| 03/06/1990 | US4905774 Process and device for guiding a drilling tool through geological formations |
| 02/21/1990 | CN2053238U Drilling pressure tester for hand wheel (handle)-type driller |
| 02/20/1990 | US4903245 Downhole vibration monitoring of a drillstring |
| 02/20/1990 | US4901806 Apparatus for controlled absorption of axial and torsional forces in a well string |
| 02/14/1990 | EP0354716A1 Apparatus and method for avoiding a drill string becoming stuck during drilling |
| 02/07/1990 | CN1039465A Method of and arrangement for drilling hole in rock |
| 02/07/1990 | CN1039464A Drill pipes and casings utilizing multi-conduit tubulars |
| 02/06/1990 | US4898251 Earth boring apparatus |
| 02/06/1990 | CA1265601A1 Programmed automatic drill control |
| 02/06/1990 | CA1265582A1 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 01/30/1990 | US4896733 Technique for providing an underground tunnel utilizing a powered boring device |
| 01/30/1990 | CA1265123A1 Mechanically actuated whipstock assembly |
| 01/30/1990 | CA1264934A1 Curvature probe and method |
| 01/24/1990 | EP0351902A1 Method of determining the porosity of an underground formation being drilled |
| 01/17/1990 | EP0350978A1 Method for determining drilling conditions while drilling |
| 12/14/1989 | DE3917931A1 Verfahren und anordnung zum bohren eines lochs in einen felsen Method and arrangement for drilling a hole in a rock |
| 12/12/1989 | US4886129 Test procedure |
| 11/16/1989 | WO1989011022A1 Hydraulic drilling machine |
| 11/16/1989 | WO1989010688A1 Method and device for determining the quantity of milk extracted from one cow |
| 11/16/1989 | WO1989010687A1 Device for determining the index of productivity and food ration of animals |
| 11/08/1989 | CN2047302U Micro-computer controlled drilling device |
| 11/07/1989 | US4878382 Method of monitoring the drilling operations by analyzing the circulating drilling mud |
| 11/02/1989 | WO1989010465A1 Hydraulic drilling machine |
| 11/02/1989 | EP0339825A1 Apparatus for data transmission in a borehole |
| 11/01/1989 | CN2046927U Travelling block vertical displacement monitor |
| 10/31/1989 | US4876886 Method for detecting drilling events from measurement while drilling sensors |
| 10/24/1989 | US4875531 Core drilling tool with direct drive |
| 10/24/1989 | US4875530 Automatic drilling system |
| 10/11/1989 | EP0336491A1 Method for detecting drilling events from measurement while drilling sensors |
| 10/11/1989 | EP0336490A1 Method for controlling a drilling operation |
| 10/11/1989 | EP0336477A1 Method of determining drill bit wear |
| 10/10/1989 | US4872509 Oil well production system using a hollow tube liner |
| 10/04/1989 | CN2045425U Driller operation box |
| 10/03/1989 | US4871035 Damping device for a percussion rock drilling machine |
| 09/27/1989 | CN1035865A Automatic controller for preventing "single-suspender rig down" |
| 09/26/1989 | CA1261817A1 Earth drilling method and apparatus using multiple hydraulic forces |
| 09/12/1989 | US4865128 Gravel packing system for a production radial tube |
| 09/06/1989 | EP0330829A1 Method and device for taking soil samples |
| 09/06/1989 | CN2044003U Controlling system for hydraulic drill |
| 09/05/1989 | US4864293 Inground boring technique including real time transducer |
| 09/05/1989 | CA1259062A1 Method and apparatus for controlling the rotational torque of a drill bit |
| 08/30/1989 | CN2043666U Electronic weight-indicating meter |
| 08/29/1989 | US4862426 Method and apparatus for operating equipment in a remote location |
| 08/29/1989 | US4860836 Method and apparatus for indicating sample collection times during well drilling |
| 08/24/1989 | DE3804389A1 Measuring device, especially for overload gear-boxes |
| 08/16/1989 | EP0327667A2 Method and device for taking soil samples |
| 08/15/1989 | US4856600 Technique for providing an underground tunnel utilizing a powered boring device |
| 08/08/1989 | US4854397 System for directional drilling and related method of use |
| 08/01/1989 | US4852665 Method for monitoring the operations of the rotary drilling of a well |
| 08/01/1989 | US4852399 Method for determining drilling conditions while drilling |
| 07/26/1989 | EP0324778A1 Boring apparatus |
| 07/18/1989 | US4848485 Method of and an arrangement for controlling rock drilling |
| 07/18/1989 | US4848144 Method of predicting the torque and drag in directional wells |
| 07/18/1989 | CA1257701A1 Method of avoiding stuck drilling equipment |
| 07/04/1989 | US4845628 Method for optimization of drilling costs |
| 07/04/1989 | US4844180 Downhole drilling motor |
| 07/04/1989 | US4843875 Procedure for measuring the rate of penetration of a drill bit |
| 06/26/1989 | EP0288527A4 Earth boring apparatus. |