| 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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| 11/18/1992 | CN2122232U Intelligent test analyzer of multi-parameter beam-pumping unit |
| 11/11/1992 | CN2121535U Drilling machine torsiometer |
| 11/11/1992 | CN1019038B Method of and arrangement for drilling hole in rock |
| 10/27/1992 | US5159577 Method of monitoring downhole conditions |
| 10/26/1992 | WO1992019841A1 A method and an equipment for adjusting rock drilling |
| 10/26/1992 | CA2109070A1 A method and an equipment for adjusting rock drilling |
| 10/21/1992 | CN1018749B Method of managing prodn. well |
| 10/20/1992 | CA1309083C Apparatus for controlled absorption of axial and torsional forces in a well string |
| 10/13/1992 | WO1992018740A1 Oil, gas or geothermal drilling apparatus |
| 10/07/1992 | CN1065121A Well remote control signal transmiting method and its receiving device |
| 10/01/1992 | WO1992016713A1 Load cell assembly and tong assembly including said load cell assembly |
| 09/29/1992 | US5151882 Method for deconvolution of non-ideal frequency response of pipe structures to acoustic signals |
| 09/26/1992 | WO1992016718A1 A drilling equipment and a method for regulating its penetration |
| 09/26/1992 | CA2107099A1 A drilling equipment and a method for regulating its penetration |
| 09/10/1992 | DE4107678A1 Annular tooth load sensor for roller tunnelling tool - has measuring points and evaluator on drill head, with measuring points fitted with magnetic field sensors |
| 09/10/1992 | DE4107676A1 Roller tunnelling tool monitoring axle load measurement - forms load independent of over-roll signal from strain gauges, recessed into axle at measurement point under rollers |
| 09/09/1992 | CN2115403U No-cable type horizontal drilling trace logging instrument |
| 09/03/1992 | WO1992014908A1 Method for automatically monitoring the vibrational condition of a drill string |
| 09/02/1992 | EP0500877A1 Method for conducting an oil drilling operation. |
| 08/25/1992 | US5141061 Method and equipment for drilling control by vibration analysis |
| 08/25/1992 | US5141060 Method for optimizing of stabilizer positioning in a bottomhole assembly to eliminate the effects of borehole inclination |
| 08/18/1992 | US5138875 Method of monitoring the drilling of a borehole |
| 08/12/1992 | CN1063526A Wireless automatic orientation system attached to drills |
| 08/11/1992 | CA1306244C Method and apparatus for controlling the force applied to a drill bit while drilling |
| 08/04/1992 | US5135058 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 07/23/1992 | WO1992012329A1 A method of drilling a hole in a rock |
| 07/21/1992 | US5131475 System for controlling drilling force of a telescoping rock drill |
| 07/15/1992 | EP0494197A1 Control method and control equipment for drilling apparatus. |
| 07/15/1992 | CN2110082U Surveying device of following drill surveying well drilling azimuth |
| 07/14/1992 | US5130951 Method for reducing noise effects in acoustic signals transmitted along a pipe structure |
| 07/14/1992 | US5129464 System for controlling a rock drill |
| 07/08/1992 | CN2109442U Gear direct pressing type drilling machine turning plate torsionmeter |
| 07/01/1992 | CN2108795U Brake handle slide-preventing stepless controller for drill |
| 06/16/1992 | US5121802 Method and arrangement for controlling a rock drilling apparatus |
| 06/09/1992 | US5119891 Adaptor for drilling strings with controllable air passage |
| 06/02/1992 | US5117926 Method and system for controlling vibrations in borehole equipment |
| 06/02/1992 | US5117921 Hydraulically operated hammer drill |
| 05/05/1992 | CA1300270C Iterative disjoint cluster and discriminant function processing of formation log responses and other data |
| 04/28/1992 | US5107933 Hydraulic drilling outfit |
| 04/16/1992 | WO1992006276A1 Method of drilling holes in rock |
| 04/10/1992 | CA2053117A1 Technique for reducing whirling of a drill string |
| 04/08/1992 | CN2101107U Lever gear drawing type drilling machine swivel plate torsiometer |
| 04/08/1992 | CN2101106U Drilling followed measuring alarm tracing transmitter |
| 04/08/1992 | CN1016204B Apparatus for avoiding stuck drilling equipment method of determining probability of unsticking stuck drill pipe |
| 04/02/1992 | WO1992005533A1 Identifying metal articles |
| 04/01/1992 | CN2100483U Operating test bench for diesel drills |
| 03/31/1992 | CA1298394C Method of determining drill bit wear |
| 03/25/1992 | CN2099837U Drill rod breaking probe |
| 03/24/1992 | CA1297782C Gravel packing system for a production radial tube |
| 03/18/1992 | CN2099190U Alarm for preventing accidont in well drilling |
| 03/15/1992 | WO1992005337A1 Method for conducting an oil drilling operation |
| 03/04/1992 | EP0472982A2 Hydraulically operated impact drilling device, especially for boltdrilling |
| 02/25/1992 | CA1296319C Directly driven coring tool |
| 02/20/1992 | WO1992002833A1 A method for deconvolution of non-ideal frequency response of pipe structures to acoustic signals |
| 02/05/1992 | EP0469317A2 Method and device for modifying the weight on an earth frill bit |
| 02/04/1992 | US5085280 Drill rig shut-off system |
| 01/22/1992 | EP0467335A2 Attitude control device and drilling-direction control device |
| 01/15/1992 | EP0466255A2 Method of determining the drilling conditions associated with the drilling of a formation with a drag bit |
| 01/15/1992 | EP0465731A1 Method and apparatus for determining the torque applied to a drillstring at the surface |
| 01/11/1992 | CA2046229A1 Method and apparatus for determining the torque applied to a drillstring at the surface |
| 12/11/1991 | CN2090417U Heat-sensitive recording and pressure regulating apparatus |
| 11/27/1991 | CN2089523U Mud filtering and removing device for signal channel interference |
| 11/27/1991 | CN1056555A Autocontroller for impact and rotation |
| 11/20/1991 | CN1014813B Autocontrol apparatus for preventing "dry drilling" |
| 11/20/1991 | CN1014812B Automatic controller for preventing "single-suspender rig down" |
| 11/12/1991 | US5064003 Hydraulic drilling machine |
| 10/30/1991 | EP0453839A2 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/27/1991 | CA2039660A1 Crane-mounted drill and method for in-situ treatment of contaminated soil |
| 10/02/1991 | CN2085852U Detector for drilling rate of rock body |
| 10/02/1991 | CN1055033A Drag analysis method |
| 09/25/1991 | CN1054813A Method and system for controlling vibrations in borehole equipment |
| 09/05/1991 | WO1991013237A1 Drag analysis method |
| 09/03/1991 | US5044398 Control valve for counterblow-tap hole-boring machine |
| 09/03/1991 | US5044198 Method of predicting the torque and drag in directional wells |
| 08/28/1991 | EP0443689A2 Method and system for controlling vibrations in borehole equipment |
| 07/31/1991 | EP0439080A1 Earth-drilling device |
| 07/30/1991 | US5035285 Electrically conductive |
| 07/23/1991 | US5033266 Overcenter valve control system and method for drilling |
| 07/10/1991 | CN2080557U Rotary-table torque monitor |
| 07/10/1991 | CN1013135B Intelligent weight-indicating meter |
| 05/15/1991 | EP0427663A1 Hydraulic drilling device and method for use |
| 05/09/1991 | CA2029094A1 Hydraulic drilling outfit |
| 05/08/1991 | CN2076600U Tester for drilling gas-oil well |
| 05/07/1991 | US5012762 Device for determining the index of individual productivity and feed ration of animals |
| 05/01/1991 | CN2076154U Remote metering kelly torque instrument |
| 04/30/1991 | US5011433 Multipole connector for control devices in underground working |
| 04/30/1991 | US5010963 Hydraulic drilling machine |
| 04/30/1991 | US5010765 Method of monitoring core sampling during borehole drilling |
| 03/28/1991 | WO1991005138A1 Control method and control equipment for drilling apparatus |
| 03/28/1991 | CA2066217A1 Control method and control equipment for drilling apparatus |
| 03/27/1991 | CN2073932U Current field type monitor following drill |
| 03/27/1991 | CN1050247A Comprehensive sampling and recording device for mechanoelectric petroleum pro specting well drilling |
| 03/20/1991 | EP0417263A1 Control device and process for drilling by vibration analysis. |
| 02/26/1991 | US4995465 Rotary drillstring guidance by feedrate oscillation |
| 02/07/1991 | WO1991001481A1 Monitoring and control of oil/gas fields |
| 01/30/1991 | CN2070359U Test controlling device for oil pressure buttom reaming drill |
| 01/30/1991 | CN1011433B Multiple functional automatic controller for safety well drilling |
| 01/30/1991 | CN1011430B Process for avoiding the equipment of well-drilling to block up in the well |
| 01/23/1991 | EP0409304A1 Method of monitoring the drilling of a borehole |
| 01/01/1991 | US4981036 Rotating drill bit |