| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 05/07/1991 | CA1283849C Downhole gaseous liquid flow agitator |
| 04/27/1991 | CA2028516A1 Releasable well tool stabilizer |
| 04/24/1991 | EP0424225A1 Riser for deep waters |
| 04/24/1991 | EP0424120A2 Borehole pressure and temperature measurement system |
| 04/24/1991 | CN2075693U Safety receiving hand of drilling geological core |
| 04/23/1991 | US5010225 Tungsten carbide grains in steel matrix |
| 04/23/1991 | US5009826 Method of molding a composite drill collar |
| 04/23/1991 | US5009272 Flow pulsing method and apparatus for drill string |
| 04/23/1991 | US5009271 Drill assembly |
| 04/23/1991 | US5009264 Well production apparatus including pump means and thermal absorption means |
| 04/21/1991 | WO1991005936A1 Centralizer, protector and stabilizer for use in wellbore and related method |
| 04/21/1991 | CA2067808A1 Centralizer, protector and stabilizer for use in wellbore and related method |
| 04/18/1991 | WO1991005133A1 Anti-fouling covering for use in sub-sea structures |
| 04/18/1991 | WO1991005132A1 Reamer |
| 04/17/1991 | EP0423055A2 Detachable torque transmitting tool joint |
| 04/16/1991 | US5007852 Electrical cable assembly |
| 04/16/1991 | US5007665 Coupling for well casings |
| 04/16/1991 | US5007487 Method and apparatus for making drill holes under spatially restricted conditions |
| 04/11/1991 | WO1991005935A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/11/1991 | CA2067227A1 Hydraulically actuated releasable connector and method for setting oil well liner |
| 04/10/1991 | EP0421669A2 Hydraulic safety joint for well tools |
| 04/10/1991 | CN2074808U Sprial wing widnow type drilling tool corrector |
| 04/09/1991 | US5006602 Polyvinylidene fluoride compositions and products made therefrom |
| 04/09/1991 | US5005656 Device in impact machines |
| 04/09/1991 | US5005642 Logging tool centralizer |
| 04/04/1991 | CA2026026A1 Hydraulic safety joint |
| 04/02/1991 | US5004057 Drill bit with improved steerability |
| 03/26/1991 | US5002139 Drilling tool |
| 03/26/1991 | CA1282091C Seal for threaded pipe connection |
| 03/26/1991 | CA1282053C Borehole drill construction |
| 03/20/1991 | EP0418056A1 Metal seal casing patch |
| 03/20/1991 | EP0417879A1 Insulating support for tubing string |
| 03/20/1991 | EP0417731A2 Tool joint & method of hardsurfacing same |
| 03/20/1991 | EP0417369A1 Method and apparatus for logging a well below a downhole pump |
| 03/19/1991 | CA1281636C Apparatus for use in cementing a casing string within a well bore |
| 03/13/1991 | CN2073026U Sucker rod righting apparatus |
| 03/12/1991 | CA1281280C Annular and concentric flow wellhead isolation tool and method of use thereof |
| 03/07/1991 | WO1991002880A1 Drill |
| 03/07/1991 | DE3928619A1 Directional drilling rig has drill rod inside drill pipe - with drill bit at angle to drill pipe axis and driven independently or simultaneously with drill pipe |
| 03/06/1991 | EP0414891A1 Method and device for trench-free laying of pipelines |
| 03/05/1991 | US4997384 Wet connector |
| 03/05/1991 | US4997048 Drill pipe assemblies |
| 03/05/1991 | US4997044 Apparatus for generating hydraulic shock waves in a well |
| 03/05/1991 | US4997043 Well landing nipple and method of operation |
| 03/05/1991 | US4997041 Method for selectively operating a wireline tool releasing device |
| 03/05/1991 | US4997039 Rod centralizer |
| 03/05/1991 | US4997037 In a well pump system |
| 02/28/1991 | DE3927952A1 Drilling for blasting - uses cradle and washing nozzle together with carriage mounted drive and hydraulic hammer |
| 02/27/1991 | EP0414242A1 Pipe joint and pipe with pipe joint |
| 02/27/1991 | CN1011827B Process and device for installing seismic sensors inside petroleum production well |
| 02/26/1991 | US4995763 Offshore well system and method |
| 02/26/1991 | US4995466 Method and device for stabilizing the path of a drilling tool |
| 02/26/1991 | US4995464 Longitudinally adjustable |
| 02/26/1991 | US4995458 Wear bushing retrieval tool |
| 02/26/1991 | US4995457 Cementing |
| 02/26/1991 | US4995456 Gravel pack well completions |
| 02/26/1991 | CA2021477A1 Well apparatus |
| 02/26/1991 | CA1280687C Flapper pad arrangement for logging sonde |
| 02/26/1991 | CA1280646C Buoy having minimal motion characteristics |
| 02/25/1991 | CA2023087A1 Pipe joint and pipe with pipe joint |
| 02/21/1991 | WO1991002185A1 Threaded tubular connection |
| 02/21/1991 | WO1991002139A1 Casing for gravity pressure reactor vessels |
| 02/20/1991 | CN2071701U Casing centralizer for directional well |
| 02/20/1991 | CN2071700U Joint for directional angular change drilling |
| 02/20/1991 | CN2071699U Stuffing box of polish rod for thermal recovery |
| 02/14/1991 | DE3926133A1 Test line for rock permeability testing - has measurement bells and packers on tube sections with connecting lines to earth's surface |
| 02/13/1991 | CN2071246U Rod clip |
| 02/12/1991 | US4991996 Work enclosure for servicing marine structures |
| 02/12/1991 | US4991669 Device for controlling the passage of a flushing medium in impact machines |
| 02/08/1991 | WO1991002137A1 Assembly comprising an extension tube and a sleeving conduit inside it |
| 02/06/1991 | EP0411260A2 Equipment for a drill string with a side entry sub and emergency release |
| 02/05/1991 | US4989902 Ratcheting and threaded well connector |
| 02/05/1991 | US4989679 Centering device that can be engaged or disengaged, specifically for a drilling assembly |
| 02/05/1991 | CA1279865C Percussive tool with high pressure fluid jet |
| 01/30/1991 | EP0410729A1 Flexible centralizer |
| 01/30/1991 | CN2070351U Centralizing device |
| 01/30/1991 | CN1011429B Coupling for oil well sucker rods and the like |
| 01/29/1991 | US4988127 Threaded tubing and casing joint |
| 01/29/1991 | US4987961 Drill stem arrangement and method |
| 01/23/1991 | EP0409446A1 Tool actuator |
| 01/23/1991 | CN2069922U Tip cone drilling rod joint |
| 01/23/1991 | CN2069921U Rolling sucker rod coupling for obtaining oil |
| 01/23/1991 | CN1011323B Tow piece downhole drill chuck |
| 01/22/1991 | US4986690 Connector assembly for wireline tool string |
| 01/22/1991 | US4986375 Device for facilitating drill bit retrieval |
| 01/22/1991 | US4986359 Release apparatus and method for threaded conductor pipe |
| 01/17/1991 | DE3919719A1 Hydrostatic rotary drive for deep boring - has hydraulic motor and removable hydraulic supply line in casing string |
| 01/16/1991 | EP0408320A2 Identification of hidden pipes etc. |
| 01/15/1991 | US4984829 Screw coupling joint |
| 01/15/1991 | US4984633 Nozzle effect protectors, centralizers, and stabilizers and related methods |
| 01/15/1991 | US4984632 Hydraulic release joint for tubing systems |
| 01/15/1991 | US4984527 Device for the remote assembly of two members |
| 01/15/1991 | CA1279004C Tubular connector |
| 01/15/1991 | CA1278909C Method for making sucker rods |
| 01/13/1991 | WO1991000974A1 Pipe connection for advance working pipes laid underground by an advance working technique |
| 01/12/1991 | CA2020781A1 Steerable earth boring device |
| 01/10/1991 | WO1990014497A3 Process and device for transmitting data signals and/or control signals in a pipe train |
| 01/08/1991 | US4983074 Offshore support structure method and apparatus |
| 01/08/1991 | US4982802 Method for stabilizing a rotary drill string and drill bit |
| 01/08/1991 | US4982801 Flexible coupling for downhole motor |