| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 03/07/1978 | US4077470 Well centralizer and method of making |
| 02/28/1978 | US4077022 Well logging method and means using an armored multiconductor coaxial cable |
| 02/28/1978 | US4076436 Stress relieved tool elements |
| 02/28/1978 | US4076284 Ocean floor riser connection |
| 02/21/1978 | USRE29541 Hydraulic drilling rig and power swivel |
| 02/21/1978 | US4074758 Extraction method and apparatus |
| 02/14/1978 | US4073352 Raise bore drilling machine |
| 02/07/1978 | US4072190 Motion compensator |
| 01/31/1978 | US4071285 Stabilizer |
| 01/31/1978 | US4071101 Stabilizer for single or dual tube drilling |
| 01/31/1978 | US4070832 Concrete well casing with cable hooks embedded therein |
| 01/24/1978 | US4070043 Double-walled pipe construction |
| 01/24/1978 | US4069878 Raise drilling bit with detachable stem |
| 01/17/1978 | US4068868 Flexible joints for marine risers |
| 01/17/1978 | US4068731 Extended nozzle and bit stabilizer and method of producing |
| 01/17/1978 | US4068730 Drill collar |
| 01/10/1978 | US4067596 Dual flow passage drill stem |
| 01/10/1978 | US4067406 Soft formation drill bit |
| 01/10/1978 | US4067405 Hydraulic shock absorber |
| 01/03/1978 | US4066995 Acoustic isolation for a telemetry system on a drill string |
| 01/03/1978 | US4066282 Positive tubing release coupling |
| 01/03/1978 | US4065822 Single point mooring with strain relief anchoring |
| 12/27/1977 | US4064953 Shear sub for drill string |
| 12/27/1977 | US4064939 Method and apparatus for running and retrieving logging instruments in highly deviated well bores |
| 12/27/1977 | US4064601 Well line strap connection |
| 12/13/1977 | US4062551 Cable seal unit for earth-boring drill strings |
| 12/13/1977 | US4062412 Flexible shaft drilling system |
| 12/13/1977 | US4062196 Method of forcibly introducing a curved steel pipe into the ground and a machine therefor |
| 12/06/1977 | US4061433 Extension rod for percussive drilling tool |
| 12/06/1977 | US4061197 Method and apparatus for drilling in permafrost and the like |
| 11/29/1977 | US4060286 Wear resistant drill pipe collar and method of making same |
| 11/29/1977 | US4060140 Method and apparatus for preventing debris build-up in underwater oil wells |
| 11/22/1977 | US4059164 Self-stabilizing drilling tool |
| 11/22/1977 | US4059148 Pressure-compensated dual marine riser |
| 11/15/1977 | US4058176 Tool and method for drilling a hole with an increased cross-sectional area |
| 11/15/1977 | US4058137 Riser pipe for pivotally attached structure used to extract petroleum from beneath a body of water |
| 11/08/1977 | US4057450 Method for making buoyancy members |
| 11/08/1977 | US4057118 Bit packer for dual tube drilling |
| 11/08/1977 | US4057115 Flexible shaft for a roof drill |
| 11/01/1977 | US4056004 Multiple arm pad instrument for logging highly deviated boreholes |
| 10/25/1977 | US4055353 Clamping device, especially for rock or concrete drills |
| 10/25/1977 | US4055338 Drill string shock absorbing apparatus |
| 10/18/1977 | US4054040 Telescoping torque transmission apparatus |
| 10/11/1977 | US4053244 Compression coupling means for a raise boring head |
| 10/04/1977 | US4051906 Extension rods used in percussive drilling |
| 10/04/1977 | US4051696 Spline mechanism for drill tools |
| 09/27/1977 | US4051456 Apparatus for establishing and maintaining electric continuity in drill pipe |
| 09/27/1977 | US4050514 Paraffin sucker rod scraper and rod centralizer |
| 09/20/1977 | US4049066 Apparatus for reducing annular back pressure near the drill bit |
| 09/13/1977 | US4047579 Sea drilling jig |
| 09/13/1977 | US4047565 Well tool |
| 08/30/1977 | US4045591 Protecting against corrosion by cleaning, cold working, and coating with a stainless steel |
| 08/30/1977 | US4044473 Tilt detector and system |
| 08/23/1977 | US4043611 Hard surfaced well tool and method of making same |
| 08/23/1977 | US4043575 Riser connector |
| 08/23/1977 | US4043410 Anti-sticking tool for drill pipe |
| 08/23/1977 | US4043409 Drill steel for deep drill hammers |
| 08/16/1977 | US4042023 Control line protector |
| 08/16/1977 | US4042022 Devices for centralizing pipes in borings |
| 08/16/1977 | US4041773 Ultrasonic inspection apparatus for well operations |
| 08/09/1977 | US4040756 Drill rod thread form |
| 08/09/1977 | US4040649 Oil well tool with packing means |
| 08/09/1977 | US4040264 Controlled buoyancy underwater riser system |
| 08/02/1977 | US4039717 Method for reducing the adherence of crude oil to sucker rods |
| 08/02/1977 | US4039237 Electrical power conductor apparatus for earth boring |
| 08/02/1977 | US4039208 Device for locking and unlocking two concentric pipes |
| 08/02/1977 | US4039027 Circumferential centralizer |
| 08/02/1977 | US4039026 Kickover tool |
| 07/19/1977 | US4036539 Drill string system |
| 07/19/1977 | US4035969 Telescopic columns of machines for making foundations, and the telescopic columns thereby derived |
| 07/05/1977 | US4033187 Well flow measuring apparatus |
| 06/28/1977 | US4031969 Method and apparatus for earth boring |
| 06/28/1977 | US4031919 Articulated riser |
| 06/28/1977 | US4031716 Automatic sequential dual action sealing system |
| 06/28/1977 | US4031713 Flexible drill pipe |
| 06/21/1977 | US4030310 Monopod drilling platform with directional drilling |
| 06/14/1977 | US4028796 For oil well production tubing |
| 05/31/1977 | US4026583 Stainless steel liner in oil well pipe |
| 05/24/1977 | US4024913 Well installations employing non-metallic lines, tubing casing and machinery |
| 05/24/1977 | US4024718 Subsea cable apparatus and method of handling same |
| 05/10/1977 | US4022287 Percussion drill bit |
| 05/10/1977 | US4022273 Bottom hole flow control apparatus |
| 05/03/1977 | US4021126 Latch mechanism for auger string couplings |
| 05/03/1977 | US4021083 Snap-lock end ring |
| 05/03/1977 | US4020688 Ultrasonic inspection apparatus for vertical members |
| 04/26/1977 | US4019592 By-pass tool |
| 04/26/1977 | US4019590 Method of roof drilling |
| 04/26/1977 | US4019213 Piping apparatus for a floating or semi-submersible platform |
| 04/12/1977 | US4016943 Method for connecting electrical conductors for electric earth boring means |
| 04/05/1977 | US4015674 Apparatus for unitizing a pair of augers |
| 04/05/1977 | US4015673 Directional drilling system |
| 03/22/1977 | US4013100 Flexible elongated member comprising a reinforcing armouring |
| 03/15/1977 | USRE29151 Repulsing clays on drill bits |
| 03/15/1977 | US4012092 Electrical two-way transmission system for tubular fluid conductors and method of construction |
| 03/15/1977 | US4012061 Dual conduit drill stem member |
| 03/15/1977 | US4011918 Stabilizer for drill strings |
| 03/15/1977 | US4011907 Knockdown centralizer |
| 03/15/1977 | US4011617 Cleaner for tubular pin and box ends |
| 03/08/1977 | US4011019 Adjustable and disengagable earth raise borer stem |
| 03/08/1977 | US4010966 Pipe coupler |