| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 02/28/1989 | CA1250455A1 Drill element for percussion drilling |
| 02/22/1989 | CN2033047U Anti-falling device for sucker rod |
| 02/21/1989 | US4806928 Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
| 02/21/1989 | US4806115 Assembly providing an electrical connection through a pipe formed of several elements |
| 02/21/1989 | US4805698 For providing electrical power |
| 02/21/1989 | US4805696 Hydraulic release tubing seal divider |
| 02/15/1989 | CN2032648U Straightening device for wellhead casing pipe |
| 02/15/1989 | CN1031123A Drill pipes and castings utilizing mult-conduit tubulars |
| 02/14/1989 | USRE32865 Fiberglass sucker rod construction |
| 02/14/1989 | US4804021 Noncracking, zirconium deoxidizer; aluminum oxide slag inclusion compound |
| 02/09/1989 | DE3725307A1 Flexible pipeline for gaseous or liquid media, in particular for connecting an underwater pipeline to a platform |
| 02/08/1989 | EP0302632A1 Drill pipes and casings utilizing multi-conduit tubulars |
| 02/08/1989 | EP0302546A1 Reversible, articulated mechanical coupling and relevant seat, for anchorages under tension |
| 02/07/1989 | CA1249772A1 Drill stem testing system |
| 02/02/1989 | DE3822276A1 Advancement pipe |
| 02/01/1989 | EP0301808A2 Device for providing a passage for a drill string |
| 02/01/1989 | EP0301060A1 Device for opening gas sources in refuse tips, and for exploring and cleansing materials for recycling and contaminated ground. |
| 01/31/1989 | US4802150 Mud pressure control system with magnetic torque transfer |
| 01/31/1989 | US4801222 Pressure-tight pipe connection for a driven pipeline |
| 01/31/1989 | US4801159 For gas meter connection |
| 01/31/1989 | US4800966 Devices for drilling branched wells |
| 01/25/1989 | EP0300739A2 Improved inner pipe member for dual-wall drill pipe assembly |
| 01/25/1989 | EP0300627A1 Method and apparatus for stabilizing a communication sensor in a borehole |
| 01/24/1989 | US4799844 Elliptical thread design |
| 01/24/1989 | US4799546 Drill pipe conveyed logging system |
| 01/24/1989 | US4799544 Drill pipes and casings utilizing multi-conduit tubulars |
| 01/19/1989 | DE3721448A1 Casing adaptor |
| 01/18/1989 | EP0299863A2 Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
| 01/18/1989 | EP0299624A2 Apparatus and method for installing a conduit within an arcuate bore |
| 01/18/1989 | EP0165996B1 Tubular connection |
| 01/17/1989 | US4798769 Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources |
| 01/17/1989 | US4798243 Packer with electrical conduit bypass |
| 01/17/1989 | CA1248938A1 Spring-loaded suspension system for augers and screw anchors |
| 01/17/1989 | CA1248936A1 Device for the remote actuation of an appliance associated with a duct in which an incompressible fluid circulates, particularly a device for actuating a stabilizer of a set of drill rods |
| 01/11/1989 | CN2030648U Optimum structure for thickening transition zone in a drill rod |
| 01/10/1989 | US4796928 Threaded connection for pipes and method of fabricating same |
| 01/10/1989 | US4796923 Joints for tubular members |
| 01/10/1989 | US4796799 Method for making sucker rods |
| 01/10/1989 | US4796670 Drill pipe protector |
| 01/10/1989 | US4796668 Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes |
| 01/10/1989 | CA1248443A1 Marine riser fill-up valve |
| 01/04/1989 | EP0297899A1 Apparatus and method for releasing a side entry sub |
| 01/04/1989 | EP0297716A1 Spring bow, centralizer and method for its use in a borehole |
| 01/03/1989 | US4795200 Lengthened tubular pin member nose for improving sealing integrity and bearing forces |
| 01/03/1989 | US4794986 Reticulated centralizing apparatus |
| 01/03/1989 | CA1248017A1 Line protectors |
| 01/03/1989 | CA1248016A1 Thermal slide joint |
| 12/29/1988 | WO1988010355A1 Device for guiding a drilling tool and/or pipe string |
| 12/28/1988 | EP0296788A2 Electrical conductor arrangements for pipe system |
| 12/27/1988 | US4794049 Electrode supporting conduit tube for electrical heating or underground hydrocarbon resources |
| 12/27/1988 | US4793754 Process for locking two screwed elements and elements for carrying out this process |
| 12/27/1988 | US4793737 Flexible riser system |
| 12/27/1988 | US4793425 Profiled body roller-reamer stabilizer |
| 12/27/1988 | US4793412 Centralizer for a polished bar and/or a substance pump piston stem |
| 12/27/1988 | US4793409 Method and apparatus for forming an insulated oil well casing |
| 12/21/1988 | EP0296056A1 Element with varying stiffness used at the foot of a riser |
| 12/21/1988 | EP0295712A2 Method and apparatus for forming an insulated oil well casing |
| 12/20/1988 | US4792802 Telemetry system for borehole drilling |
| 12/20/1988 | US4792756 Method and apparatus for measuring axially extending defects in ferromagnetic elements |
| 12/20/1988 | US4792000 Method and apparatus for well drilling |
| 12/20/1988 | US4791816 Device for determining when a threaded tube joint with screw limiting stop is properly made up |
| 12/15/1988 | WO1988009898A1 Connections for tubes made of composite materials |
| 12/15/1988 | WO1988009864A1 Assembly for and method of coupling adjacent sections of a string of pipes |
| 12/14/1988 | EP0294809A2 Heating system for rathole oil well |
| 12/13/1988 | US4790383 Method and apparatus for multi-zone casing perforation |
| 12/13/1988 | US4790381 Centralizing devices for use in bore-holes |
| 12/13/1988 | US4790380 For monitoring well fluid characteristics |
| 12/13/1988 | US4790377 Side entry sub well logging apparatus and method |
| 12/07/1988 | EP0294252A1 Equipment for a drill string with a side entry sub and method for its use |
| 12/07/1988 | EP0294225A2 Apparatus for measuring the formation resistivity in earth strata |
| 12/07/1988 | EP0294088A2 Assembly for and method of coupling adjacent sections of a string of pipes |
| 12/07/1988 | CN87205847U Device for filling gravel inside pipe |
| 12/06/1988 | CA1246118A1 Pipe joint |
| 12/01/1988 | WO1988009460A1 Anti-fouling covering for sub sea structures |
| 12/01/1988 | DE3717024A1 Device for drilling boreholes and injecting stabilising material |
| 11/30/1988 | EP0292998A1 Pipe with threaded ends |
| 11/29/1988 | US4787771 Loaded sucker rod fitting |
| 11/29/1988 | US4787458 For well casing to function between the casing and a wellbore |
| 11/29/1988 | US4787450 Gas lift process for restoring flow in depleted geothermal reservoirs |
| 11/29/1988 | US4787448 Rod guide |
| 11/29/1988 | US4787446 Inflatable packer and fluid flow control apparatus for wellbore operations |
| 11/29/1988 | CA1245689A1 Pipe connector |
| 11/29/1988 | CA1245688A1 Snap type pipe connector |
| 11/24/1988 | DE3715900A1 Separating device for casing strings of oil production wells |
| 11/23/1988 | EP0292464A1 Threaded connector for a drill pipe |
| 11/23/1988 | EP0292085A2 Tubular connector |
| 11/22/1988 | US4786090 Peaked-top resilient seal ring and connection therewith |
| 11/22/1988 | US4785853 Conduct pipe covered with electrically insulating material |
| 11/22/1988 | US4785852 Conduct pipe covered with electrically insulating material |
| 11/22/1988 | CA1245213A1 Drill bit and extension adapter |
| 11/22/1988 | CA1245212A1 Method and system of drilling deviated wellbores |
| 11/17/1988 | EP0291143A2 Subsea riser for multiple bore wells |
| 11/16/1988 | CN87216383U Hydraulic casing screwing machine for rope drill |
| 11/15/1988 | US4784238 Large diameter borehole apparatus |
| 11/15/1988 | US4784230 For drilling an underground pilot bore hole |
| 11/09/1988 | EP0289673A1 Drill pipes and casings utilizing multi-conduit tubulars |
| 11/02/1988 | EP0289103A2 Pipe connector and method of applying same |
| 11/01/1988 | CA1244063A1 Pipe connection |
| 10/27/1988 | DE3811370A1 Bohrkopf mit einstueckig geschmiedetem stabilisator Drilling head with integral forged stabilizer |
| 10/26/1988 | EP0287735A2 Method for completing a drainhole well |