| 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) |
|---|
| 06/30/1981 | US4275793 Automatic control system for rock drills |
| 06/30/1981 | US4275588 Heavy duty dynamic high-torque-measurement coupling unit |
| 06/16/1981 | US4273193 Process for use in degasification of subterranean mineral deposits |
| 06/09/1981 | US4271914 Automatic feed and rotational speed control system of a hydraulic motor operated drill |
| 05/15/1981 | EP0030975A4 Hydraulic motor for a drill hole coring tool and method. |
| 04/30/1981 | WO1981001168A1 Monitoring equipment for drilling operations |
| 02/17/1981 | US4250758 Combination for use in a rotary drilling system with torque meter |
| 02/03/1981 | CA1095023A1 Rock drill bit loading device |
| 01/27/1981 | US4246973 Controls for hydraulic percussion drill |
| 01/13/1981 | CA1093459A1 Well perforating tool |
| 01/08/1981 | WO1981000018A1 Hydraulic motor for a drill hole coring tool and method |
| 01/08/1981 | WO1981000016A1 Fluid flow restrictor valve for a drill hole coring tool and method |
| 12/30/1980 | US4241796 Active drill stabilizer assembly |
| 12/02/1980 | US4236408 Drilling rig load indicator |
| 10/07/1980 | US4226311 Rotary drive disc brake for drawworks |
| 09/02/1980 | CA1084900A1 Controls for hydraulic percussion drill |
| 08/06/1980 | EP0014042A1 Borehole drilling apparatus |
| 08/05/1980 | CA1083132A1 Method and system for determining formation porosity |
| 07/15/1980 | US4212359 Downhole weight control device for impact rock drilling tool |
| 06/03/1980 | CA1078815A1 Tilt preventing system for drills |
| 04/01/1980 | US4195699 Drilling optimization searching and control method |
| 03/25/1980 | US4194578 Raise boring head with retractable gage cutters |
| 02/26/1980 | US4190123 Rock drill bit loading device |
| 02/05/1980 | US4187546 Computer-controlled oil drilling rig having drawworks motor and brake control arrangement |
| 01/29/1980 | US4185705 Well perforating tool |
| 01/08/1980 | CA1069493A1 Automated drill pipe handling system |
| 12/11/1979 | US4177866 System for boring raises having portions of different diameters |
| 08/28/1979 | US4165789 Drilling optimization searching and control apparatus |
| 06/26/1979 | CA1057081A1 Method and apparatus for determining on-board a heaving vessel the flow rate of drilling fluid flowing out of a wellhole and into a telescoping marine riser connected between the wellhole and vessel |
| 06/19/1979 | CA1056808A1 Thrust and tension measuring device for use with flexible tubing injectors on drilling rigs |
| 06/05/1979 | US4157231 Hydraulic drill unit |
| 05/29/1979 | CA1055477A1 Rock drill |
| 04/24/1979 | US4150568 Apparatus and method for down hole vibration spectrum analysis |
| 04/17/1979 | CA1052909A1 Device to gauge the position and the speed of a drill |
| 02/06/1979 | US4137974 Hydraulically driven kelly crowd |
| 12/12/1978 | CA1044117A1 Hydraulic flow divider for a mining vehicle |
| 08/29/1978 | US4109733 Tilt preventing system for drills |
| 04/25/1978 | US4085612 Heavy duty torque coupling |
| 02/21/1978 | US4074771 Rock drill |
| 02/07/1978 | US4072198 Hydraulic rock drill |
| 01/17/1978 | US4068728 Hydraulic flow divider for a mining vehicle |
| 01/10/1978 | US4067423 Control system for rotary drill |
| 12/27/1977 | US4064950 Hydraulic drilling machine |
| 12/27/1977 | US4064749 Method and system for determining formation porosity |
| 12/06/1977 | US4061967 Support system for rotatable detecting element |
| 08/16/1977 | US4042123 Automated pipe handling system |
| 08/16/1977 | US4042043 Portable earth boring machine |
| 05/17/1977 | US4023626 Self-adaptive hydraulic rock drill |
| 09/28/1976 | US3982432 Well monitoring and analyzing system |
| 09/21/1976 | US3981186 Device for blocking at a given torque a rotating machine driven by a hydraulic turbine |
| 09/14/1976 | US3979944 Hydraulic drill, in particular a rock drill |
| 08/24/1976 | US3976148 Method and apparatus for determining onboard a heaving vessel the flow rate of drilling fluid flowing out of a wellhole and into a telescoping marine riser connecting between the wellhouse and the vessel |
| 07/27/1976 | US3971449 Procedure for controlling a rock drill and rock drill for carrying out the procedure |
| 03/23/1976 | US3945443 Steerable rock boring head for earth boring machines |
| 03/09/1976 | US3942594 Drill pipe monitoring system |
| 02/24/1976 | US3939926 Portable earth boring machine |