| 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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| 10/25/1994 | US5358058 Drill automation control system |
| 10/12/1994 | CN1093436A Numeric controlled well top equipment |
| 10/11/1994 | US5353884 Positioning device for a member and drilling system employing said positioning device |
| 09/20/1994 | US5348106 Method of drilling a hole in a rock |
| 09/14/1994 | CN2177093Y Digit control magnetic sensitive travel positioning unit |
| 09/06/1994 | US5343964 Petroleum, gas or geothermal driling apparatus |
| 09/01/1994 | WO1994019579A1 Method and apparatus for detecting impending sticking of a drillstring |
| 08/30/1994 | US5341886 System for controlled drilling of boreholes along planned profile |
| 08/17/1994 | CN1090907A Method for measuring law of oil injection and device thereof |
| 08/04/1994 | DE4312171C1 Hydraulic hammer mechanism for drill |
| 08/04/1994 | DE4302755A1 Parameter control system for hydraulic equipment, e.g. for torque control of drill spindle e.g. of rock drilling machine |
| 07/26/1994 | US5332048 Method and apparatus for automatic closed loop drilling system |
| 07/21/1994 | WO1994016301A1 Mechanical torque indicator |
| 07/21/1994 | CA2149233A1 Mechanical torque indicator |
| 07/13/1994 | CN2171674Y Movable survey control device for oil well site |
| 07/12/1994 | US5327984 Method of controlling cuttings accumulation in high-angle wells |
| 07/05/1994 | US5325714 Steerable motor system with integrated formation evaluation logging capacity |
| 07/05/1994 | CA1330594C Procedure for measuring the rate of penetration of a drill bit |
| 06/16/1994 | DE4314102C1 Method for remote control of earth propulsion body - has starting device and compressed air or electrically operated propulsion drive together with control for fixing position alterations |
| 06/07/1994 | CA1330076C Downhole drilling motor |
| 05/31/1994 | US5316090 Attitude control device and drilling-direction control device |
| 05/25/1994 | EP0598139A1 Control apparatus for excavators |
| 05/24/1994 | US5314030 System for continuously guided drilling |
| 05/18/1994 | CN1024580C Comprehensive sampling and recording device for mechanoelectric petroleum prospecting well drilling |
| 05/17/1994 | US5311954 Process for overcoming drag while installing an element within a cavity |
| 05/03/1994 | US5307885 Attitude and drilling-direction control device |
| 04/27/1994 | EP0594418A1 Automatic downhole drilling system |
| 04/26/1994 | US5305836 System and method for controlling drill bit usage and well plan |
| 04/21/1994 | DE4244516C1 Start-up monitoring apparatus for hydraulically driven machine - has time control component connected to electrical pressure switch, magnet-valve and disconnecting switch of motor. |
| 04/19/1994 | CA1328693C Method of predicting and controlling the drilling trajectory in directional wells |
| 04/13/1994 | CN1024210C Well remote control signal transmiting method and its receiving device |
| 04/12/1994 | US5303203 Method for reducing noise effects in acoustic signals transmitted along a pipe structure |
| 03/22/1994 | US5295548 Bottom-hole information collecting equipment |
| 03/17/1994 | DE4230624A1 Remote controlled mechanical mole - has streamlined casing mounted on hollow cylindrical shock absorber |
| 03/02/1994 | EP0584110A1 A method and an arrangement for controlling the supply of air into a rock drilling machine. |
| 03/02/1994 | EP0417263B1 Control device and process for drilling by vibration analysis |
| 02/08/1994 | US5284403 Control method and control equipment for drilling apparatus |
| 02/03/1994 | DE4323126A1 Hand operated mechanical auger - has release lever associated with brake to disengage drive when auger strikes object |
| 02/02/1994 | EP0580678A1 A method and an equipment for adjusting rock drilling. |
| 01/26/1994 | CN1081229A Numerically controlled magneto stroke positioning unit |
| 01/19/1994 | CN2153630Y Mixing water temp. automatic device for borehole of oil well |
| 01/18/1994 | US5279372 Method of drilling holes in rock |
| 01/12/1994 | EP0577845A1 Device for positioning member and excavating direction control device for excavator employing said device |
| 01/12/1994 | EP0577664A1 A drilling equipment and a method for regulating its penetration |
| 01/06/1994 | WO1994000673A1 Control apparatus for excavators |
| 12/28/1993 | US5273122 Automatic method for monitoring the vibrational state of a drill string |
| 12/19/1993 | CA2071612A1 Apparatus for preventing an uncontrolled increase in the speed of a drilling motor during air drilling |
| 12/14/1993 | US5269383 Navigable downhole drilling system |
| 12/01/1993 | EP0572055A1 Method for detecting drillstring washouts |
| 11/23/1993 | US5265247 Laboratory data storage and retrieval system and method |
| 11/17/1993 | CN1078533A Movable logging-controlling apparatus used in situ of oil well |
| 10/27/1993 | CN1077774A Microcomputer control system for roller-bit driller |
| 10/26/1993 | US5255750 Hydraulic drilling method with penetration control |
| 10/26/1993 | US5255590 Control device for the load- dependent connection of a hydraulic stand by motor to a base-load motor |
| 10/20/1993 | CN2144175Y Controller of gearless drilling equipment for ore deposit |
| 10/13/1993 | EP0564504A1 A method of drilling a hole in a rock. |
| 09/21/1993 | US5245877 Tong load cell assembly |
| 09/21/1993 | US5245871 Process for controlling a drilling operation |
| 09/16/1993 | WO1993018273A1 Downhole tool for controlling the drilling course of a borehole |
| 09/07/1993 | US5242025 Guided oscillatory well path drilling by seismic imaging |
| 09/07/1993 | US5242020 Method for deploying extendable arm for formation evaluation MWD tool |
| 08/17/1993 | US5237539 System and method for processing and displaying well logging data during drilling |
| 08/10/1993 | US5235259 Apparatus and method for controlling a motor |
| 08/05/1993 | WO1993015300A1 Device for positioning member and excavating direction control device for excavator employing said device |
| 07/21/1993 | EP0551299A1 Method of drilling holes in rock. |
| 07/21/1993 | CN2138694Y Follower active damper in mining field |
| 07/14/1993 | EP0551134A1 Method for evaluating formations and bit conditions |
| 07/14/1993 | CN2138191Y Electric controller for phase-choosing protecting and speed reducing stopping of screw pump |
| 07/13/1993 | US5226332 Vibration monitoring system for drillstring |
| 07/08/1993 | WO1993013399A1 Audio torque indicator |
| 06/24/1993 | WO1993012319A1 System for controlled drilling of boreholes along planned profile |
| 06/24/1993 | WO1993012318A1 System for controlled drilling of boreholes along planned profile |
| 06/22/1993 | US5220963 System for controlled drilling of boreholes along planned profile |
| 06/09/1993 | DE4140214A1 Rock boring injection drill anchor rod - is guided by stabilising head with inbuilt threaded nut fixed to rock face |
| 06/08/1993 | US5216917 Method of determining the drilling conditions associated with the drilling of a formation with a drag bit |
| 06/08/1993 | CA1318910C Rotary drill bit |
| 06/02/1993 | CN1072753A Measuring device of drilling azimuthal angle for measuring accompaning with drilling |
| 05/26/1993 | CN2134484Y Automatic control device for slurry pump of petroleum well drilling |
| 05/25/1993 | CA1318244C Method and apparatus for operating equipment in a remote location |
| 05/22/1993 | CA2082488A1 Mechanically actuated fluid control device for downhole fluid motor |
| 04/28/1993 | EP0539240A2 Measurement-while-drilling system |
| 04/27/1993 | US5205365 Pressure assisted running of tubulars |
| 04/27/1993 | US5205364 Process and drilling equipment for sinking a well in underground rock formations |
| 04/27/1993 | US5205163 Method and apparatus for determining the torque applied to a drillstring at the surface |
| 04/21/1993 | CN1071224A Measuring, alarming, tracing and transmitting in conjuction with drill |
| 04/20/1993 | CA1316525C Method of determining the porosity of an underground formation being drilled |
| 04/13/1993 | US5202680 System for drill string tallying, tracking and service factor measurement |
| 04/13/1993 | CA1316167C Method for determining drilling conditions while drilling |
| 04/01/1993 | WO1993006339A1 Downhole drilling data processing and interpreting device and method for implementing same |
| 02/23/1993 | CA1313862C Method for detecting drilling events from measurement while drilling sensors |
| 02/16/1993 | US5186264 Device for guiding a drilling tool into a well and for exerting thereon a hydraulic force |
| 02/10/1993 | EP0526619A1 Method for automatically monitoring the vibrational condition of a drill string. |
| 01/19/1993 | US5181172 Method for predicting drillstring sticking |
| 01/19/1993 | CA1312937C Method of controlling the direction of a drill bit in a borehole |
| 01/05/1993 | CA1312217C Method and apparatus for investigating drag and torque loss in the drilling process |
| 12/29/1992 | US5174392 Mechanically actuated fluid control device for downhole fluid motor |
| 12/16/1992 | EP0518297A1 Excavation equipment and method to control the rate of advance of an excavation tool |
| 11/26/1992 | WO1992020898A1 A method and an arrangement for controlling the supply of air into a rock drilling machine |
| 11/25/1992 | CN2122933U Hydraulic large vice torque controller |
| 11/24/1992 | CA1310753C Wear determination method for a tool cutting element during the drilling of a rock formation |