| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 04/21/1998 | US5740862 Rod guide assembly |
| 04/21/1998 | US5740860 Side pocket mandrel for a measuring instrument |
| 04/16/1998 | WO1998015712A2 Method of forming wellbores from a main wellbore |
| 04/16/1998 | WO1998015710A1 Reaming apparatus with enhanced stability and transition from pilot hole to enlarged bore diameter |
| 04/15/1998 | EP0835360A1 Hydraulic thruster for use in a drill string |
| 04/15/1998 | CN2278762Y Threaded joint for oil well pipe |
| 04/15/1998 | CN2278761Y Threaded joint for oil well pipe |
| 04/15/1998 | CN2278760Y Non-hardened and -tempered steel pumping rod forging and air cooling apparatus |
| 04/14/1998 | US5738464 Curvature limiter for a pipe running in a marine environment |
| 04/14/1998 | US5738388 Device for permanent joining of tubes |
| 04/14/1998 | US5738034 Fairing system for subsea drilling rigs and method for installation and removal |
| 04/09/1998 | WO1998014685A2 Improved emergency release tool |
| 04/08/1998 | CN2278078Y Rotary corrector for sucker rod |
| 04/07/1998 | US5735636 Method for installing an expansion joint in a concrete dam |
| 04/07/1998 | US5735358 Indexing percussive drilling bit |
| 04/07/1998 | US5735350 Methods and systems for subterranean multilateral well drilling and completion |
| 04/02/1998 | WO1998013576A1 Safety joint |
| 04/02/1998 | WO1998013575A1 Bit assembly |
| 04/02/1998 | WO1998013574A1 Welded drill pipes in which the internal flash is removed and relative procedure of manufacturing |
| 04/02/1998 | WO1998013555A1 A method in piling tubular bases, a combined drilling and piling rig, as well as use of the drill hammer of said rig |
| 04/02/1998 | CA2266550A1 A method in piling tubular bases, a combined drilling and piling rig, as well as use of the drill hammer of said rig |
| 04/01/1998 | EP0833115A1 Spacing holder for ground probe tubes |
| 04/01/1998 | EP0833036A2 Thermosettable composition, its use and a flexible deployable preform containing this composition |
| 04/01/1998 | EP0832345A2 Subsurface signal transmitting apparatus |
| 04/01/1998 | EP0832344A2 Down hole hammer assembly |
| 04/01/1998 | CN1177698A Screw joint for oil pipe and casing pipe |
| 03/31/1998 | US5732777 Well tubing suspension and rotator system |
| 03/31/1998 | US5732775 Duplex assembly for use with drill pipe |
| 03/31/1998 | US5732771 Protective sheath for protecting and separating a plurality of insulated cable conductors for an underground well |
| 03/26/1998 | WO1998012418A2 Autonomous downhole oilfield tool |
| 03/26/1998 | WO1998012412A1 Drill shank for a drill drive |
| 03/26/1998 | WO1998012411A1 System for transferring hydrocarbons |
| 03/26/1998 | WO1998012410A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 03/26/1998 | DE19638464A1 Einsteckende für einen Bohrantrieb Insertion of a drill drive |
| 03/26/1998 | CA2266494A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 03/25/1998 | EP0830492A1 Centralizer |
| 03/24/1998 | US5730554 Apparatus for operations on a subsea well |
| 03/24/1998 | US5730220 Method of and device for production of hydrocarbons |
| 03/24/1998 | US5730218 Tool protection guide with energy absorbing bumper |
| 03/24/1998 | CA2078872C Thermal mineral extraction system |
| 03/18/1998 | EP0829615A2 Probing device with threaded connections ,in particular for exploring foundations and old waste dumps |
| 03/18/1998 | EP0829614A1 Drilling apparatus and drilling method |
| 03/18/1998 | EP0828923A2 Device for controlling the weight on an earth drill bit |
| 03/18/1998 | EP0828919A1 Device for the power supply of an immersed pump hanging from a pipe, particularly a flexible pipe |
| 03/18/1998 | EP0828918A1 Connector assembly for an expandable slotted pipe |
| 03/18/1998 | EP0828914A1 Adjustable stabilizer for directional drilling |
| 03/18/1998 | CN2276553Y Multipurpose ball type sucker rod lifting tool |
| 03/18/1998 | CN2276552Y Electric heat sucker rod |
| 03/17/1998 | US5727630 Telescopic joint control line system |
| 03/17/1998 | US5727629 Wellbore milling guide and method |
| 03/17/1998 | US5727627 Well rod centralizer/centralizer stop interface with wear reducing surface |
| 03/12/1998 | WO1998009740A1 In situ deep remediation injection system & method |
| 03/12/1998 | CA2264710A1 In situ deep remediation injection system & method |
| 03/11/1998 | CN2276068Y Nipple for oil well pipe |
| 03/11/1998 | CN1175990A Downhole tool |
| 03/10/1998 | US5725061 Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path |
| 03/09/1998 | CA2214551A1 A drilling hole system |
| 03/05/1998 | WO1998009046A1 A drill pipe |
| 03/05/1998 | CA2263901A1 A drill pipe |
| 03/03/1998 | US5722496 Removable guide member for guiding drill string components in a drill hole |
| 03/03/1998 | US5722492 Catenary riser support |
| 03/03/1998 | US5722488 Apparatus for downhole drilling communications and method for making and using the same |
| 02/26/1998 | WO1998007953A1 Centralizer |
| 02/25/1998 | EP0825325A1 Catenary riser supports |
| 02/25/1998 | EP0825324A2 Tool connector |
| 02/25/1998 | EP0824629A1 Drill string fitting |
| 02/25/1998 | EP0824628A1 Connector assembly for an expandable slotted pipe |
| 02/25/1998 | EP0824627A1 Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| 02/25/1998 | CN1174587A Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 02/24/1998 | US5720355 Drill bit instrumentation and method for controlling drilling or core-drilling |
| 02/19/1998 | WO1998006925A2 Dual annulus production tool |
| 02/18/1998 | CN2274686Y Swinging oil pipe aligning device |
| 02/17/1998 | US5718291 Downhole disconnect tool |
| 02/16/1998 | CA2212696A1 Latch and release tool connector and method |
| 02/12/1998 | WO1998005476A1 Forwardly located bit retention means |
| 02/11/1998 | EP0823536A2 Centralising device |
| 02/11/1998 | EP0823535A2 Earth roller dril bit with cutting structure |
| 02/10/1998 | US5715898 Stabiliser for a downhole apparatus |
| 02/10/1998 | US5715895 Downhole drilling tool cooling system |
| 02/10/1998 | CA2122958C Hydraulic disconnect |
| 02/05/1998 | DE19630639A1 Mine percussive drilling machine |
| 02/03/1998 | US5713423 Drill pipe |
| 01/29/1998 | WO1997041330A3 Multi-lateral wellbore system and method for forming same |
| 01/28/1998 | CN2273346Y Centering guide |
| 01/28/1998 | CN1037204C Well wall cleaning tool with scrap element |
| 01/27/1998 | US5711386 Equipment to reduce torque on a drill string |
| 01/27/1998 | US5711043 Set tool and cap |
| 01/27/1998 | CA2037048C Extension tube and internal jacketing conduit assembly |
| 01/22/1998 | WO1998002634A1 Downhole tool and method |
| 01/22/1998 | WO1998002633A1 Rotary cone drill bit with integral stabilizers |
| 01/21/1998 | EP0819206A1 Apparatus for use in a wellbore |
| 01/21/1998 | EP0713560B1 Equipment to reduce torque on a drill string |
| 01/21/1998 | CN2272941Y Borehole thermal recovery compensator |
| 01/21/1998 | CN1171149A High pressure fiber reinforced composite pipe joint |
| 01/20/1998 | US5709416 Threaded coupling-tool joint |
| 01/20/1998 | US5709269 Dissolvable grip or seal arrangement |
| 01/20/1998 | CA2125354C Guard device |
| 01/14/1998 | EP0817938A1 Corrosion protection for steel pipes |
| 01/14/1998 | EP0817901A1 Dual-member pipe joint for a dual member drill string |
| 01/14/1998 | CN1037025C Improved anti-seizure protection for joints, particularly suitable for petroleum sector |