| 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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| 07/16/1996 | US5535834 Pumping liquid mixture containing alkyl or aryl metal sulfonate and solvent down drill stem with drilling mud to coat and lubricate drill and bore, also to flush cutting residues from bore |
| 07/10/1996 | EP0721052A2 Hydraulic circuit for automatic control of a horizontal boring machine |
| 07/10/1996 | EP0720685A1 Drill automation control system |
| 07/07/1996 | CA2156559A1 Hydraulic circuit for automatic control of a horizontal boring machine |
| 07/02/1996 | US5531278 Power drill with drill bit unit capable of providing intermittent axial impact |
| 06/26/1996 | EP0718641A2 Drilling system with downhole apparatus for transforming multiple downhole sensor measurements into parameters of interest and for causing the drilling direction to change in response thereto |
| 06/13/1996 | WO1996018118A1 Method for real time location of deep boreholes while drilling |
| 06/12/1996 | EP0558703B1 Downhole drilling data processing and interpreting device and method for implementing same |
| 06/11/1996 | US5524713 Drill rig having alternate spindle drive |
| 06/04/1996 | US5522461 Mill valve |
| 05/01/1996 | EP0709546A2 Method and apparatus for determining drilling conditions |
| 05/01/1996 | EP0708872A1 Method and apparatus for controlling the head of a drilling or core-drilling device |
| 04/24/1996 | EP0708226A2 A brake for a hoisting apparatus |
| 04/16/1996 | US5508915 Method to combine statistical and engineering techniques for stuck pipe data analysis |
| 04/16/1996 | US5507353 Method and system for controlling the rotary speed stability of a drill bit |
| 04/03/1996 | CN2223778Y Pressure remote control device being able to repeatedly switch |
| 03/26/1996 | US5501285 Method for controlling the head of a drilling or core-drilling device and apparatus for carrying out this method |
| 03/06/1996 | EP0699823A1 Earth dumping control device for a small diameter pipe propelling machine |
| 03/06/1996 | CN1031212C Controlling method for indented wheel drilling machine and microcomputer automatic controlling system thereof |
| 02/22/1996 | WO1996005410A1 A drilling apparatus |
| 02/07/1996 | CN1116270A Drilling intelligent controller |
| 01/31/1996 | EP0694114A1 Automatic drilling system |
| 01/24/1996 | CN2218251Y Digital controlling and electric driving apparatus for drill |
| 01/02/1996 | US5479996 Rock drilling device with recoil damper |
| 12/27/1995 | EP0688938A1 Device for the control of rotary drawworks |
| 12/26/1995 | US5478170 Controlling apparatus for excavator |
| 12/13/1995 | EP0686752A1 Directional drilling methods and apparatus |
| 12/13/1995 | EP0578690B1 Oil, gas or geothermal drilling apparatus |
| 12/13/1995 | EP0494197B1 Control method for drilling apparatus |
| 12/13/1995 | CN2215021Y Automatic control device of oscillating screen |
| 12/12/1995 | US5474142 Automatic drilling system |
| 12/12/1995 | CA2019635C Overcenter valve control system and method for drilling |
| 12/06/1995 | EP0685301A1 Hydraulic percussive device with infinitely variable number of impacts and impact energy |
| 11/14/1995 | US5465798 In a rotary blasthole drilling apparatus |
| 11/08/1995 | EP0681089A1 Coiled tubing thruster |
| 11/06/1995 | CA2122959A1 Coil tubing thruster |
| 11/02/1995 | DE4433618C1 Mining drill displacement regulation system |
| 10/26/1995 | WO1995028549A1 Arrangement in a hydraulically operated rock drilling equipment |
| 10/26/1995 | CA2187630A1 Arrangement in a hydraulically operated rock drilling equipment |
| 10/17/1995 | US5458207 Method and an equipment for adjusting rock drilling |
| 10/10/1995 | US5456317 Buoyancy assisted running of perforated tubulars |
| 10/10/1995 | US5456106 Down hole assembly |
| 10/05/1995 | DE4410404A1 Drill string feed-rate control for sinking large boreholes |
| 10/03/1995 | US5454436 Method of warning of pipe sticking during drilling operations |
| 09/20/1995 | EP0672818A1 Modular measurement while drilling sensor assembly |
| 09/12/1995 | US5449047 Automatic control of drilling system |
| 09/12/1995 | US5449046 Earth boring tool with continuous rotation impulsed steering |
| 09/12/1995 | US5448911 Method and apparatus for detecting impending sticking of a drillstring |
| 08/31/1995 | WO1995023275A1 Arrangement for control means in rock drilling equipment |
| 08/30/1995 | EP0526619B1 Method for automatically monitoring the vibrational condition of a drill string |
| 08/30/1995 | CN2206349Y Big hook rise-and-fall height indicator for petroleum drilling rig |
| 08/17/1995 | WO1995021990A1 Compliance-based torque and drag monitoring system and method |
| 08/16/1995 | CN2205441Y Multifunction micro computer weight indicator |
| 08/08/1995 | US5439064 System for controlled drilling of boreholes along planned profile |
| 07/18/1995 | US5433119 Of a positive displacement hydraulic motor |
| 07/11/1995 | US5431046 Compliance-based torque and drag monitoring system and method |
| 06/20/1995 | US5425429 Method and apparatus for forming lateral boreholes |
| 06/14/1995 | EP0657620A1 Method and system for the control of the "stick-slip" of a drill tool |
| 06/07/1995 | CN1028790C MWD alarm tracer transmitter |
| 06/07/1995 | CN1028789C MWD drilling directional angle measuring apparatus |
| 06/06/1995 | US5421420 Downhole weight-on-bit control for directional drilling |
| 05/30/1995 | US5419405 System for controlled drilling of boreholes along planned profile |
| 05/16/1995 | US5416697 Method for selecting a drill bit for use in drilling a well |
| 05/16/1995 | US5415030 For investigating properties of subsurface formations traversed by borehole |
| 05/04/1995 | WO1995012040A1 Drilling apparatus |
| 05/04/1995 | CA2175361A1 Drilling apparatus |
| 05/02/1995 | CA1335449C Drilling equipment |
| 04/25/1995 | US5409072 Method and an arrangement for controlling the supply of air into a rock drilling machine |
| 04/19/1995 | EP0648915A1 Rock drilling device |
| 04/11/1995 | US5404959 Drill rig safety shutdown device |
| 04/11/1995 | CA1335214C Method of predicting the torque and drag in directional wells |
| 04/06/1995 | WO1995009296A1 Apparatus and method for the dynamic measurement of a drill string employed in drilling |
| 04/06/1995 | WO1995009294A1 Drill automation control system |
| 03/30/1995 | WO1995008693A1 Arrangement for controlling the feed mechanism of a rock drill |
| 03/15/1995 | CN1100178A Method for enhancing limit anticollision reliability of driller |
| 02/21/1995 | US5390748 Method and apparatus for drilling optimum subterranean well boreholes |
| 02/21/1995 | US5390747 Well rig lift system and a hydraulic energy-storing well rig lift system |
| 02/15/1995 | EP0500877B1 Method for conducting an oil drilling operation |
| 02/14/1995 | US5388649 Drilling equipment and a method for regulating its penetration |
| 02/02/1995 | WO1995003472A1 Method and apparatus for controlling the head of a drilling or core-drilling device |
| 02/01/1995 | CN2188650Y Automatic monitoring instrument for cement surface |
| 01/19/1995 | DE4323708A1 Hydraulic motor with two switching stages and automatic control by way of the pressure supply |
| 01/11/1995 | CN2187224Y Safety monitoring and automatic drill-feeding device for drilling |
| 01/03/1995 | US5377550 Mechanical torque indicator |
| 12/14/1994 | EP0628127A1 Downhole tool for controlling the drilling course of a borehole. |
| 11/29/1994 | US5368112 Tensioning apparatus for tie down lines |
| 11/29/1994 | US5368108 Optimized drilling with positive displacement drilling motors |
| 11/24/1994 | WO1994027028A1 Earth dumping control device for a small diameter pipe propelling machine |
| 11/17/1994 | EP0624706A2 Directional drilling system with integrated formation evaluation logging tool |
| 11/13/1994 | CA2123273A1 Steerable motor system with integrated formation evaluation logging capacity |
| 11/10/1994 | WO1994025722A1 Drill rig having automatic spindle stop |
| 11/10/1994 | CA2136726A1 Drill rig having automatic spindle stop |
| 11/08/1994 | CA1332968C Method of positioning a feed beam provided with a rock drilling machine |
| 11/02/1994 | EP0622519A1 Remotely controlled earth excavation device |
| 11/01/1994 | US5360072 Drill rig having automatic spindle stop |
| 10/27/1994 | WO1994024415A1 Control system for percussion drill |
| 10/27/1994 | WO1994024407A1 Automatic drilling system |
| 10/27/1994 | CA2161128A1 Control system for percussion drill |
| 10/25/1994 | US5358062 Portable handheld drilling apparatus |
| 10/25/1994 | US5358059 Apparatus and method for the dynamic measurement of a drill string employed in drilling |