| 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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| 06/05/1991 | CN2078367U Torque-limiting device by button-up on liquid-gas large pincers |
| 06/04/1991 | US5020590 Back pressure plug tool |
| 05/28/1991 | US5018588 Anchor drilling implement |
| 05/28/1991 | US5018583 Well process using a composite rod-stiffened pressurized cable |
| 05/22/1991 | CN1051606A Automatic anticollision device for pulley of petroleum well drilling derrick |
| 05/21/1991 | US5016708 Apparatus and method for producing and cleaning an oil well |
| 05/15/1991 | EP0427663A1 Hydraulic drilling device and method for use |
| 05/15/1991 | EP0427304A1 Apparatus for longitudinally driving an elongate body |
| 05/15/1991 | EP0426788A1 High-pressure pipe string for continuous fusion drilling of deep wells, process and device for manufacturing, propelling and dismantling it. |
| 05/15/1991 | EP0293379B1 An apparatus in rock drilling machines or the like |
| 05/14/1991 | US5014781 Tubing collar position sensing apparatus, and associated methods, for use with a snubbing unit |
| 05/14/1991 | US5014578 Pipe tongs |
| 05/09/1991 | CA2029094A1 Hydraulic drilling outfit |
| 05/08/1991 | EP0425802A1 Drilling device with percussive and rotative tool |
| 05/08/1991 | EP0245394B1 A method and a drilling rig for drilling a bore well |
| 05/07/1991 | US5013880 Process for welding a follower pipe to a buried pipe string |
| 05/07/1991 | US5013188 Process for replacing a length of buried pipe |
| 05/07/1991 | US5012762 Device for determining the index of individual productivity and feed ration of animals |
| 05/02/1991 | EP0424779A1 Self-propelled equipment to bore in tunnels |
| 05/02/1991 | EP0424768A1 Device to feed reinforcement rods |
| 05/02/1991 | EP0424733A1 Device to load reinforcement rods |
| 04/30/1991 | US5010963 Hydraulic drilling machine |
| 04/24/1991 | EP0423296A1 Device for blocking off a well in open flow. |
| 04/23/1991 | US5009289 Blowout preventer string support |
| 04/23/1991 | US5009265 Packer for wellhead repair unit |
| 04/17/1991 | EP0423055A2 Detachable torque transmitting tool joint |
| 04/16/1991 | US5007487 Method and apparatus for making drill holes under spatially restricted conditions |
| 04/04/1991 | WO1991004391A1 Method and apparatus for drilling |
| 04/03/1991 | CN2074358U Hoisting machine for deep-well pump |
| 04/02/1991 | US5004055 Vibratory core drill apparatus for the recovery of soil or sediment core samples |
| 03/28/1991 | WO1991005137A1 Method and apparatus for drilling a tunnel |
| 03/28/1991 | CA2066238A1 Method and apparatus for drilling a tunnel |
| 03/26/1991 | US5002433 System for transferring fluids from a piping system in a ship's hull to a turning device, and vice versa |
| 03/26/1991 | US5002130 System for handling reeled tubing |
| 03/26/1991 | US5001926 Device for determining the vertical distance between two elements at unequal heights |
| 03/20/1991 | EP0417365A1 Marine casing suspension apparatus |
| 03/19/1991 | US5000271 Feeding device for a rock drilling machine |
| 03/19/1991 | US5000065 Jaw assembly for power tongs and like apparatus |
| 03/13/1991 | EP0417055A1 Device for positioning of a drill bit |
| 03/13/1991 | CN2073028U Linkage power clamp composed of main clamp and back damp |
| 03/13/1991 | CN2073027U Mechanical pneumatic feeder for drill |
| 03/12/1991 | US4998590 Horizontal auger for skidsteer tractors and the like |
| 03/07/1991 | WO1991002880A1 Drill |
| 03/06/1991 | CN2072589U Light rod-broken safety rope-hanging unit |
| 03/05/1991 | US4997042 Casing circulator and method |
| 02/28/1991 | DE3927952A1 Drilling for blasting - uses cradle and washing nozzle together with carriage mounted drive and hydraulic hammer |
| 02/28/1991 | CA2017846A1 Rod elevator insert |
| 02/26/1991 | US4995464 Longitudinally adjustable |
| 02/26/1991 | CA2021477A1 Well apparatus |
| 02/20/1991 | CN1011721B Dynamic slewing locked water tap |
| 02/20/1991 | CN1011720B Lifting apparatus for drilling |
| 02/18/1991 | WO1991002693A1 Friction grip for tubular goods |
| 02/14/1991 | DE3926049A1 Device for clamping and carrying blow out preventer or pipes - in borehole drilling operations, can be swivelled through 360 degrees and can be locked by manual or remote control |
| 02/13/1991 | EP0412535A1 Tubing collar position sensing apparatus, and associated methods, for use with a snubbing unit |
| 02/13/1991 | CN2071247U Self lock safety ball clip lifting device |
| 02/10/1991 | CA2022770A1 Tubing collar position sensing apparatus, and associated methods, for use with a snubbing unit |
| 02/06/1991 | CN2070814U Hanging pliers for repairing well |
| 02/05/1991 | US4989909 Friction grip for tubular goods |
| 02/05/1991 | CA1279883C Pipe handling apparatus |
| 02/04/1991 | WO1991002138A1 Apparatus for recovering a wellhead |
| 01/31/1991 | DE3925504A1 Device for drawing out pipe embedded in solid material - has wall abutment plate and draw element guided through pipe |
| 01/31/1991 | DE3925503A1 Extractor for drawing out pipes embedded in fixed material - has wall abutment plate and two pressure devices adjustable relative to same |
| 01/29/1991 | USRE33526 Power tongs and control system |
| 01/23/1991 | EP0408685A1 A method and a device for movement-compensation in riser pipes. |
| 01/22/1991 | US4986370 Pneumatic hammer lift |
| 01/22/1991 | US4986360 System for handling reeled tubing |
| 01/22/1991 | US4986359 Release apparatus and method for threaded conductor pipe |
| 01/22/1991 | US4986351 Portable pump removal equipment |
| 01/22/1991 | US4986146 Camming member for power tongs |
| 01/16/1991 | CN2069477U Safety pin of elevator |
| 01/15/1991 | CA1278959C Bearing structure and a floating vessel comprising such structure |
| 01/15/1991 | CA1278933C Powered pipe wrench |
| 01/09/1991 | EP0406986A2 Well pipe handling machine |
| 01/09/1991 | CN1048428A Hydraulic fixture chucking from three directions |
| 01/02/1991 | CN2068579U Exhaust unit of pneumatic drill |
| 01/01/1991 | US4981316 Rod elevator insert |
| 12/31/1990 | CA2019115A1 Apparatus for handling a drilling equipment |
| 12/25/1990 | US4979578 Lever-action motorized earth drill |
| 12/25/1990 | US4979575 Method of drilling a hole-in a rock |
| 12/25/1990 | US4979356 Torque wrench |
| 12/19/1990 | CN1010864B Method and apparatus for installation of electric heater in well |
| 12/15/1990 | CA2013862A1 Well unit dynamometer installation means and method |
| 12/11/1990 | US4976321 Horizontal earth boring machine and method |
| 12/11/1990 | CA1277592C Method and system for attaching and removing equipment from a wellhead |
| 12/04/1990 | US4974686 Apparatus for handling a drilling equipment |
| 11/28/1990 | CN2066482U Disconnecting device of drilling rod |
| 11/27/1990 | US4972911 Travelling centralizer arrangement in a rock drill |
| 11/27/1990 | US4972741 Isolated torsional-transfer combined tong apparatus |
| 11/22/1990 | EP0397858A1 Apparatus for forming slit in base rock and concrete surface |
| 11/20/1990 | US4971162 Continuous drill feed apparatus |
| 11/20/1990 | US4971158 Method in rotary drilling and rotary drilling apparatus |
| 11/20/1990 | US4971157 Apparatus for the removal of spoil when making trenches of great depth |
| 11/15/1990 | WO1990013729A1 High-pressure pipe string for continuous fusion drilling of deep wells, process and device for manufacturing, propelling and dismantling it |
| 11/15/1990 | CA2033068A1 High-pressure pipe string for continuous fusion drilling of deep wells |
| 11/14/1990 | EP0396747A1 Pipe-gripping device for rotor of drilling rig |
| 11/13/1990 | WO1990013730A1 Arrangement in a pipe handling system |
| 11/07/1990 | EP0396204A2 Method and device for joining well tubulars |
| 11/06/1990 | CA1276008C Self-adjusting bit basket |
| 11/01/1990 | WO1990012948A1 Mobile drilling rig |
| 10/31/1990 | EP0395167A1 Device and method for making a borehole in the ground |