| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 02/04/1992 | US5085285 Compensating ring for a down hole hammer |
| 02/04/1992 | US5085283 Method and tool string for curving a vertical borehole horizontally |
| 02/04/1992 | US5085273 Casing lined oil or gas well |
| 01/30/1992 | DE4024000A1 Centralisers for oil well casings |
| 01/29/1992 | EP0468668A2 Rotary locking system with metal seals |
| 01/29/1992 | CN2094615U Positioning mechanical arm for connecting suspended hanging pipe |
| 01/28/1992 | WO1992002751A1 Casing and flexible tubular duct comprising same, and production method therefor |
| 01/28/1992 | US5083755 Face shock absorber for extracting core-collecting pipes |
| 01/28/1992 | US5083623 Hydraulic shock absorber |
| 01/28/1992 | CA2065840A1 Casing and flexible tubular duct comprising same, and production method therefor |
| 01/26/1992 | CA2046805A1 Rotary locking system with metal seals |
| 01/22/1992 | EP0467635A2 Thermally insulating compositions and a method of insulating pipeline bundles and pipeline riser caissons |
| 01/22/1992 | EP0467580A1 Subterranean drill bit and related methods |
| 01/22/1992 | EP0466859A1 Pipework for constructing a ground water measuring point. |
| 01/22/1992 | EP0466702A1 Coupling for drilling machine with dust extractor. |
| 01/21/1992 | US5082070 Hollow drill bit |
| 01/21/1992 | US5082069 Combination drivepipe/casing and installation method for offshore well |
| 01/21/1992 | US5082061 Rotary locking system with metal seals |
| 01/21/1992 | CA1294542C Fluid transfer device between sea floor and surface |
| 01/17/1992 | WO1992001856A1 Variable geometry cluster drill |
| 01/17/1992 | CA2086758A1 Variable geometry cluster drill |
| 01/16/1992 | DE4040155A1 Sinking of deep boreholes by rotary flushing - comprises lowering drill string contg. rotary drill end bit, into the hole then passing flushing fluid through the string |
| 01/14/1992 | USRE33793 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein |
| 01/14/1992 | US5080400 Double lobe tubular connector clamp |
| 01/14/1992 | US5080175 Use of composite rod-stiffened wireline cable for transporting well tool |
| 01/14/1992 | US5080168 Device for locking a cable passing across the wall of a tube such as a side-entry sub |
| 01/14/1992 | US5079824 Method for the installation of a jacket reinforcement for piping |
| 01/11/1992 | CA2044901A1 Device for making a hole in the ground |
| 01/09/1992 | WO1992000437A1 Production pipe having an integrated hydraulic line |
| 01/08/1992 | EP0465316A1 Apparatus for stimulating production and for logging for non-eruptive wells |
| 01/08/1992 | CN2092597U Twisting moment joints of obverse and reverse directions |
| 01/08/1992 | CN2092596U Multi-purposed bit joints for underpit use |
| 01/07/1992 | US5078650 Universal joint arrangement for downhole tools |
| 01/07/1992 | CA2020623A1 Cushion connector |
| 01/07/1992 | CA1293853C2 Method and apparatus for joining pipe |
| 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 | EP0463198A1 Soil drilling equipment |
| 01/01/1992 | CN2091946U Sucker rod fastener |
| 12/31/1991 | US5076355 Perforating gun with auger |
| 12/27/1991 | EP0462719A2 Conductor guide forming machine |
| 12/27/1991 | EP0462618A2 Method and apparatus for horizontal drilling |
| 12/25/1991 | CN2091348U Slope mine steering device |
| 12/25/1991 | CN1015198B Hermetic metal pipe joint |
| 12/24/1991 | US5074367 Rock bit with improved shank protection |
| 12/24/1991 | US5074366 Method and apparatus for horizontal drilling |
| 12/24/1991 | US5074356 Milling tool and combined stabilizer |
| 12/22/1991 | CA2045059A1 Method and apparatus for horizontal drilling |
| 12/19/1991 | DE4117950A1 Pipe driven through ground - comprises pipe inside concrete body with end-pieces of ductile cast iron |
| 12/18/1991 | EP0461311A2 Cylindrical telescopic kelly-bar apparatus |
| 12/18/1991 | CN1057110A Method of and apparatus for ultrasonic identification of materials and equipment |
| 12/17/1991 | CA1293296C Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
| 12/12/1991 | WO1991019879A1 Drill steering apparatus |
| 12/12/1991 | CA2085121A1 Drill steering apparatus |
| 12/11/1991 | EP0460733A1 A method of and an apparatus for the ultrasonic identification of materials and equipment |
| 12/10/1991 | US5071053 Method and device for joining well tubulars |
| 12/10/1991 | US5070951 Drill for water wells |
| 12/10/1991 | US5070950 Remote controlled actuation device |
| 12/10/1991 | US5070940 Apparatus for deploying and energizing submergible electric motor downhole |
| 12/05/1991 | CA2043744A1 Method of and an apparatus for the ultrasonic identification of materials and equipment |
| 12/04/1991 | EP0459960A1 Screw thread structure |
| 12/04/1991 | EP0459738A2 A control line |
| 12/04/1991 | EP0459649A1 Inflatable buoyant near surface riser disconnect system |
| 12/04/1991 | CN1056728A Sucker rod adjusting device |
| 12/04/1991 | CN1015016B Joint of sucker rod |
| 12/03/1991 | US5069761 Method for pretreating the connecting elements of a gas-tight pipe connection |
| 12/03/1991 | US5069297 Drill pipe/casing protector and method |
| 12/03/1991 | US5069285 Dual wall well development tool |
| 12/03/1991 | US5069284 Wear resistant rod guide |
| 12/03/1991 | CA1292758C Cylindrical threaded connection with uniform interference |
| 12/01/1991 | CA2038191A1 Inflatable buoyant near surface riser disconnect system |
| 11/30/1991 | CA2042879A1 Screw thread structure |
| 11/27/1991 | EP0458289A1 Connection for drill pipes or the like |
| 11/27/1991 | EP0220274B1 Tubular connection having two thread sets with multiple interengaging characteristics |
| 11/26/1991 | CA1292488C Pipe joint |
| 11/26/1991 | CA1292487C Petroleum equipment tubular connection |
| 11/21/1991 | EP0457653A1 Safety sleeve and device for wells, particularly for a subterranean reservoir of fluid under pressure |
| 11/20/1991 | CN2089066U Drill collar centralising device maching hanger |
| 11/20/1991 | CN2089065U Threaded sealing film |
| 11/20/1991 | CN1056331A Combined lower drill tool for decreasing batter of well |
| 11/19/1991 | WO1991018180A1 Preform device and processes for coating and/or lining a cylindrical volume |
| 11/19/1991 | US5066060 Running tool |
| 11/19/1991 | US5066052 Threaded pipe joint having improved seal ring entrapment |
| 11/19/1991 | US5065827 Hammer bit retention tool |
| 11/19/1991 | US5065826 Apparatus for optional straight or directional drilling underground formations |
| 11/14/1991 | WO1991017514A1 Oilfield equipment identification apparatus |
| 11/14/1991 | WO1991008370A3 Device for steering the foremost part of a drill pipe |
| 11/12/1991 | US5064224 Oil field tubular connection |
| 11/12/1991 | US5064007 Drilling a well bore |
| 11/12/1991 | US5064004 Drill rod for percussion drilling |
| 11/12/1991 | US5064002 Concentric drill rod assemblies for percussion rock drills |
| 11/12/1991 | CA2042256A1 Safety sleeve for a borehole communicating with an underground reserve of fluid under pressure, and associated safety system, and an associated borehole operating method |
| 11/12/1991 | CA1291880C Threaded coupling |
| 11/06/1991 | CN1055979A Diameter-regulating centralizing device |
| 11/05/1991 | US5062914 Method for affixing a metallic tip to a tube made of composite wound material |
| 11/05/1991 | US5062667 Connection seal |
| 10/31/1991 | WO1991016520A1 A borehole, as well as a method and an apparatus for forming it |
| 10/31/1991 | WO1991008374A3 Apparatus and method for centralising a casing |
| 10/31/1991 | DE3941081A1 System involving lost rock drills and probes - employs drill of appropriate dia. with lateral slots for expulsion of drilled-out material |
| 10/30/1991 | EP0454148A2 Pipe joint |