| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 03/31/1981 | US4258796 Earth drilling apparatus |
| 03/31/1981 | US4258792 Hydraulic tubing tensioner |
| 03/31/1981 | US4258788 CPI Casing |
| 03/25/1981 | EP0025650A1 Apparatus and method for recovering ground drilling equipment in a borehole |
| 03/24/1981 | US4257245 Compression shock absorber device |
| 03/24/1981 | CA1098112A1 Non-rotating stabilizer for drill string |
| 03/24/1981 | CA1098111A1 Wall contacting tool |
| 03/17/1981 | US4256518 Welding and austenitizing earth boring apparatus |
| 03/17/1981 | US4256417 Variable stiffness lower joint for pipe riser with fixed bottom |
| 03/17/1981 | US4256146 Flexible composite tube |
| 03/17/1981 | US4255847 Method of making a knockdown centralizer |
| 03/10/1981 | US4255068 Method and a device for undersea drilling |
| 03/10/1981 | US4254837 Technique for damping oscillations in a drill string |
| 03/10/1981 | US4254638 Positive release means for articulated flexible shaft |
| 03/10/1981 | CA1097332A1 Roof drill bit |
| 03/03/1981 | US4253687 Pipe connection |
| 03/03/1981 | US4253532 In-hole motor drill with locking bit clutch |
| 03/03/1981 | US4253324 Drill pipe reforming method and apparatus |
| 03/03/1981 | CA1096953A1 Remote istrumentation apparatus |
| 02/24/1981 | US4252196 Control tool |
| 02/17/1981 | US4250966 Insertion type cementing baffle |
| 02/17/1981 | CA1095888A1 Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint |
| 02/10/1981 | US4249831 Well tool |
| 02/10/1981 | US4249611 Marine conductor string provided with a connector and a connector for use in such a marine conductor string |
| 02/10/1981 | US4249610 Offshore drilling control cable clamp system |
| 02/10/1981 | CA1095553A1 Pipe connectors |
| 02/10/1981 | CA1095401A1 Split-stack blowout prevention system |
| 02/03/1981 | CA1095023A1 Rock drill bit loading device |
| 01/28/1981 | EP0022865A1 Hydraulically-driven downhole drill |
| 01/27/1981 | US4247217 Rope swivel socket |
| 01/27/1981 | US4247156 Shaft bearing |
| 01/27/1981 | US4246975 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
| 01/27/1981 | US4246765 Shock absorbing subassembly |
| 01/22/1981 | WO1981000132A1 Methods and arrangements for casing a borehole |
| 01/20/1981 | US4245709 Removable drill string stabilizers |
| 01/20/1981 | US4245708 Blade stabilizer provided with at least one fluid passage having a venturi effect, in particular for use in combination with a drill bit |
| 01/20/1981 | CA1094047A1 Rock drilling apparatus |
| 01/13/1981 | US4244607 Cylindrical threaded connection |
| 01/13/1981 | US4244433 Safety mechanism for a raise drill |
| 01/07/1981 | EP0021702A1 Installation of tunnel linings |
| 01/07/1981 | EP0020416A1 Improvements in and relating to electrical power transmission in fluid wells |
| 01/06/1981 | US4243727 Surface smoothed tool joint hardfacing |
| 01/06/1981 | US4243252 Dual concentric pipe joint |
| 01/06/1981 | US4243099 Selectively-controlled well bore apparatus |
| 01/06/1981 | CA1093064A1 Combined stabilizer and reamer for drilling well bores |
| 01/06/1981 | CA1092993A1 Pneumatically actuated thread protector for pipes |
| 12/30/1980 | US4241800 Cutting tool for a pneumatic hammer |
| 12/30/1980 | US4241789 Concrete wall casing with centralizers embedded therein |
| 12/30/1980 | CA1092532A1 Kelly and saver sub combination with telemetering means |
| 12/23/1980 | US4240652 Lightweight drill rod |
| 12/23/1980 | US4240512 Arrangement for guiding a bore-crown or bit along a given path |
| 12/23/1980 | US4240506 Downhole riser assembly |
| 12/16/1980 | US4239083 Method and apparatus for rotating tubing conduits |
| 12/02/1980 | US4236734 Well tubing coupling system |
| 12/02/1980 | CA1090593A1 Device having a flexible conduit for transferring a fluid through a liquid |
| 11/25/1980 | US4236113 Electrical well logging tool, having an expandable sleeve, for determining if clay is present in an earth formation |
| 11/25/1980 | CA1090325A1 Replaceable sleeve drill collar stabilizer |
| 11/18/1980 | US4234270 Marine structure |
| 11/18/1980 | US4234047 Disconnectable riser for deep water operation |
| 11/18/1980 | US4233820 Flexible drill pipe |
| 11/11/1980 | US4232751 In-hole motor drill with bit clutch |
| 11/04/1980 | US4231594 Pipe joint structure |
| 11/04/1980 | US4231437 Combined stabilizer and reamer for drilling well bores |
| 11/04/1980 | US4231436 Marine riser insert sleeves |
| 11/04/1980 | US4231312 Flexible ocean upwelling pipe |
| 10/21/1980 | US4228863 Reamer bit for raise boring |
| 10/21/1980 | US4228862 Apparatus for drilling holes in the ground |
| 10/21/1980 | US4228857 Floating platform well production apparatus |
| 10/21/1980 | US4228853 Petroleum production method |
| 10/14/1980 | US4227585 Rotating stabilizer for shaft drilling |
| 10/14/1980 | CA1087603A1 Borehole contacting apparatus for bottom hole assembly |
| 10/07/1980 | US4226645 Hydrogen sulfide stress cracking resistance, aluminum-killed, rolling, austenitizing, quenching to martensite |
| 10/07/1980 | US4226290 Roof drilling system |
| 10/07/1980 | US4226288 Side hole drilling in boreholes |
| 09/23/1980 | US4223747 Drilling using reverse circulation |
| 09/23/1980 | US4223737 Method for well operations |
| 09/23/1980 | CA1086295A1 Arrangement for guiding a bore-crown or bit along a given path |
| 09/23/1980 | CA1086246A1 Apparatus for the protection of tubes particularly tubes for drilling petroleum |
| 09/23/1980 | CA1086223A1 Split-ring riser latch |
| 09/23/1980 | CA1086222A1 Marine production riser system |
| 09/17/1980 | EP0015726A1 Method relating to the pumping of fluid along a tubular structure in a bore of a well and tubular component for use in such structure |
| 09/16/1980 | US4222590 Equally tensioned coupling apparatus |
| 09/16/1980 | CA1085815A1 Screw thread for a drill string element |
| 09/09/1980 | US4221549 Inertia bar for sucker rods |
| 09/09/1980 | US4221504 Stabilization of subsea riser pipes having free lower ends |
| 09/09/1980 | CA1085378A1 Rotating stabilizer for shaft drilling |
| 09/02/1980 | US4220381 Drill pipe telemetering system with electrodes exposed to mud |
| 09/02/1980 | US4220213 Method and apparatus for self orienting a drill string while drilling a well bore |
| 09/02/1980 | US4220207 Seafloor diverter |
| 09/02/1980 | CA1084899A1 Swivel connector |
| 09/02/1980 | CA1084836A1 Wireline shifting tool apparatus and method |
| 08/26/1980 | US4219081 Knockdown centralizer |
| 08/26/1980 | CA1084553A1 Casing joint |
| 08/19/1980 | US4218651 Apparatus for detecting longitudinal and transverse imperfections in elongated ferrous workpieces |
| 08/19/1980 | CA1083839A1 Pivotal connecting device for pivotally connecting an off-shore articulated column structure to a sea bottom |
| 08/12/1980 | US4216835 System for connecting an underwater platform to an underwater floor |
| 08/12/1980 | US4216834 Connecting assembly and method |
| 08/12/1980 | CA1083366A1 High reliability connecting fittings and tubes for movable pipe ends |
| 08/06/1980 | EP0014113A1 Flexible transmission line |
| 08/06/1980 | EP0014042A1 Borehole drilling apparatus |