| Patents for E21B 19 - Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables (17,198) |
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| 01/15/1992 | EP0466472A2 Annulus pressure responsive downhole testing tool |
| 01/15/1992 | CN2093237U Automatic conveyer for drilling tool |
| 01/14/1992 | CA1294134C Method and apparatus for tensioning a riser |
| 01/14/1992 | CA1294133C Method and apparatus for tensioning a riser |
| 01/11/1992 | CA2046698A1 Hydraulic system for electronically controlled pressure activated downhole testing tool |
| 01/08/1992 | CN1057695A Apparatus for handling drilling equipment |
| 01/05/1992 | WO1992001139A1 Radially deformable tube consisting of several releasably connected sections |
| 01/05/1992 | CA2086558A1 Radially deformable tube consisting of several releasably connected sections |
| 01/02/1992 | EP0463211A1 Soil decontamination |
| 12/31/1991 | US5076374 Drilling device with an impact-rotation tool |
| 12/31/1991 | US5076372 Under frame mounted soil sampler for light trucks |
| 12/27/1991 | CA2045746A1 Built-in rack apparatus |
| 12/26/1991 | WO1991019885A1 Apparatus for feeding a drilling machine in extension rod drilling |
| 12/26/1991 | WO1991019880A1 Apparatus for storing drill rods |
| 12/18/1991 | EP0461512A2 Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well |
| 12/18/1991 | CN1057088A Hydraulic oil well repairing machine with energy storage |
| 12/17/1991 | US5072981 Soil moisture tube extraction device |
| 12/17/1991 | US5072656 Method and apparatus for controlling the transfer of tubular members into a shelter |
| 12/10/1991 | US5071053 Method and device for joining well tubulars |
| 12/10/1991 | US5070948 Directional rod pusher |
| 12/05/1991 | DE4016759A1 Hydraulic hammer-scoop combination - fits on excavator arm, and involves support connected to tool rotary axis |
| 12/03/1991 | US5069580 Subsea payload installation system |
| 12/03/1991 | US5069488 Method and a device for movement-compensation in riser pipes |
| 12/03/1991 | US5069426 Internal hydraulic pipe pushing apparatus |
| 11/27/1991 | EP0458767A2 Steering mechanism for a subsoil boring apparatus |
| 11/26/1991 | US5067570 Auger and retaining shell assembly |
| 11/26/1991 | US5067569 Auger and sweeper assembly |
| 11/26/1991 | CA2036528A1 Steering mechanism for a subsoil boring apparatus |
| 11/20/1991 | CN1056332A Power tongs with openable jaws |
| 11/20/1991 | CN1014812B Automatic controller for preventing "single-suspender rig down" |
| 11/19/1991 | US5066059 Drill string compensator with improved transloaders |
| 11/14/1991 | DE4018735A1 Soil specimen extraction arrangement - has hollow tube mounted on jib attached to rail linked to tractor hydraulic mechanism |
| 11/13/1991 | EP0455685A1 System to control a motor for the assembly or dis-assembly of two members. |
| 11/12/1991 | WO1991018181A1 Device for transmitting forces to mobile bodies |
| 11/05/1991 | US5062756 Device for positioning and stabbing casing from a remote selectively variable location |
| 10/30/1991 | EP0233274B1 Riser tensioning system |
| 10/29/1991 | US5060735 Device for positioning of a drill bit |
| 10/29/1991 | US5060731 Method of installing well conductors |
| 10/29/1991 | US5060542 Apparatus and method for making and breaking joints in drill pipe strings |
| 10/29/1991 | CA1291557C Surface acoustic wave pipe identification system |
| 10/23/1991 | CN1055572A Labour-saving short drilling rig |
| 10/22/1991 | US5058688 Convertible vibratory or rotary core drill apparatus |
| 10/22/1991 | US5058454 Polished rod spacer system |
| 10/16/1991 | EP0451683A2 Propulsion process of buried pipe |
| 10/15/1991 | CA1290684C Back pressure plug tool |
| 10/08/1991 | US5054565 Steering mechanism for a subsoil boring apparatus |
| 10/08/1991 | US5054550 Centering spinning for down hole tubulars |
| 10/05/1991 | CA2038890A1 Drill string compensator with improved transloaders |
| 10/03/1991 | WO1991014851A1 Propelling system in small diameter pipe propeller |
| 10/03/1991 | WO1991014832A1 Device for driving rods used primarily for soil mechanics tests into the ground |
| 10/03/1991 | CA2078326A1 Device for driving rods used primarily for soil mechanics tests into the ground |
| 10/02/1991 | EP0449710A2 Video system and method for determining and monitoring the depth of a bottomhole assembly within a wellbore |
| 10/02/1991 | CN1014163B Hydraulic slip system with three-direction slip |
| 10/01/1991 | CA2039572A1 Power wrench apparatus |
| 10/01/1991 | CA2039406A1 Video system and method for determining and monitoring the depth of a bottomhole assembly within a borehole |
| 10/01/1991 | CA1289939C Drill magazine |
| 09/25/1991 | EP0448462A1 Apparatus for driving rods into the ground, used in particular for ground mechanic testing |
| 09/25/1991 | EP0447444A1 A telescopically extensible drill |
| 09/24/1991 | US5050691 Detachable torque transmitting tool joint |
| 09/24/1991 | US5050688 Rock drill feed support |
| 09/24/1991 | US5050681 Hydraulic system for electronically controlled pressure activated downhole testing tool |
| 09/24/1991 | US5050283 Arrangement for handling drill rods in a rock drilling unit or the like |
| 09/19/1991 | WO1991014074A1 Composite rod-stiffened pressurized cable |
| 09/17/1991 | US5049020 Device for positioning and stabbing casing from a remote selectively variable location |
| 09/17/1991 | US5048793 Pipe jack |
| 09/17/1991 | US5048377 Gripping and rotating tong device |
| 09/11/1991 | EP0445194A1 Assembly for use in a belttong. |
| 09/04/1991 | CN1013783B Joining of hollow drill rads |
| 09/03/1991 | US5044826 Method and apparatus for umbilical hydraulic control lines in floating production systems |
| 09/03/1991 | US5044232 Active jaw for a power tong |
| 09/03/1991 | CA1288415C Pipe lining apparatus |
| 08/28/1991 | CN2083624U Drilling tool transportation machine |
| 08/28/1991 | CN1054113A Apparatus for lifting operation at derricks |
| 08/27/1991 | US5042601 Triple tool with sliding spider bowl |
| 08/21/1991 | CN2083187U Conical slip-type square elevator for pumping rods |
| 08/21/1991 | CN2083186U Suspension of stuffing box gland |
| 08/20/1991 | US5040926 Piling method |
| 08/20/1991 | US5040827 Method and apparatus for improved oilfield connections |
| 08/20/1991 | US5040438 Powered wrench apparatus |
| 08/17/1991 | WO1991012407A1 Pipe alignment device |
| 08/17/1991 | CA2075918A1 Pipe alignment device |
| 08/13/1991 | US5038871 Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well |
| 08/08/1991 | WO1991011646A1 Utility tunneling method and apparatus |
| 08/08/1991 | DE4002947A1 Derrick rig for installation, dismantling and other work at boreholes - reduces working time, is light and compact, and can be a fixture or mobile |
| 08/07/1991 | EP0439600A1 Drill. |
| 08/06/1991 | US5036927 Drilling machine |
| 07/31/1991 | EP0439080A1 Earth-drilling device |
| 07/23/1991 | US5033907 Pipe alignment device |
| 07/23/1991 | US5033266 Overcenter valve control system and method for drilling |
| 07/09/1991 | CA1285930C Drilling derrick device |
| 07/03/1991 | EP0434712A1 A method and an apparatus for pushing pipes along a pipe line. |
| 07/02/1991 | US5027926 Slip assembly |
| 07/02/1991 | US5027903 Coiled tubing velocity string hangoff method and apparatus |
| 07/02/1991 | CA1285472C Method and system for maintenance and servicing of subsea wells |
| 06/27/1991 | WO1991008866A1 Power tongs with improved gripping means |
| 06/26/1991 | EP0434652A1 Rock drilling rig |
| 06/25/1991 | US5025857 Wellhead tubing and casing packer and installation and removal tool |
| 06/21/1991 | CA2031559A1 Rock drilling rig |
| 06/19/1991 | EP0433192A1 Device for running in of threaded couplings for tube assemblies by screwing and unscrewing |
| 06/11/1991 | US5022799 Coke drum drill stem alignment device |