| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 10/30/1991 | EP0454147A2 Thread form |
| 10/29/1991 | US5061119 Method and apparatus for the remediation of contaminated soils |
| 10/29/1991 | US5060740 Screw thread coupling |
| 10/29/1991 | US5060737 Drilling system |
| 10/29/1991 | US5060731 Method of installing well conductors |
| 10/29/1991 | US5060726 Method and apparatus for producing tar sand deposits containing conductive layers having little or no vertical communication |
| 10/28/1991 | CA2041346A1 Pipe joint |
| 10/28/1991 | CA2041345A1 Thread form |
| 10/24/1991 | DE3941609C1 Boring head for mining - has head and shaft provided with fluid flushing channels and tapering surface on head |
| 10/23/1991 | EP0452397A1 Wireline releasing device and method of releasing wireline |
| 10/23/1991 | CN2087238U Hollow sucker rod |
| 10/22/1991 | US5060287 Heater utilizing copper-nickel alloy core |
| 10/22/1991 | US5059043 Blast joint for snubbing unit |
| 10/22/1991 | US5058689 Wear protective means for a drilling tool |
| 10/22/1991 | US5058683 Wet connector |
| 10/22/1991 | CA1290954C Oil well sucker rod coupling assembly |
| 10/22/1991 | CA1290952C Downhole motor drive shaft universal joint assembly |
| 10/16/1991 | EP0452126A2 Apparatus for orienting perforating gun |
| 10/16/1991 | EP0452033A2 A fluid flow control system, assembly and method for oil and gas wells |
| 10/16/1991 | EP0451683A2 Propulsion process of buried pipe |
| 10/16/1991 | EP0451185A1 System and method for sealed connection between two abutting tube ends. |
| 10/16/1991 | CN2086792U Centralising apparatus for oil well logging |
| 10/15/1991 | US5056611 Screw thread structure |
| 10/15/1991 | US5056598 Method of protecting casing during high pressure well stimulation |
| 10/13/1991 | CA2037791A1 Fluid flow control system, assembly and method for oil and gas wells |
| 10/09/1991 | EP0450207A1 Downhole drilling tool system |
| 10/09/1991 | CN1055219A Construction for hanging freely auxiliary gushing tube in deep well |
| 10/08/1991 | USRE33708 Surveying of boreholes using shortened non-magnetic collars |
| 10/08/1991 | CA1290467C Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 10/08/1991 | CA1290364C Threaded joint having sealing device at threads, for steel pipe |
| 10/03/1991 | CA2013756A1 Downhole drilling tool system |
| 10/02/1991 | CN1014176B Apparatus for conveying liquid between bottom and surface of sea |
| 10/01/1991 | WO1991015654A1 Thermal mineral extraction system |
| 10/01/1991 | US5052849 Quick-locking connector |
| 10/01/1991 | US5052503 Eccentric drilling tool |
| 10/01/1991 | US5052491 Oil tool and method for controlling paraffin deposits in oil flow lines and downhole strings |
| 10/01/1991 | US5052439 Undersea hydraulic coupling with dovetail seal |
| 10/01/1991 | US5052422 All weather apparatus for cleaning pipe threads |
| 10/01/1991 | CA1289940C2 Method and apparatus for absorbing shock |
| 10/01/1991 | CA1289867C Drainhole well completion |
| 09/25/1991 | EP0448397A2 Method and apparatus for drilling a highly angulated wellbore |
| 09/25/1991 | EP0447444A1 A telescopically extensible drill |
| 09/25/1991 | CN1014084B Method and apparatus for multi-stage cementing of well casing |
| 09/24/1991 | US5051036 Method of installing lean-to well protector |
| 09/24/1991 | US5050691 Detachable torque transmitting tool joint |
| 09/24/1991 | US5050690 In-situ stress measurement method and device |
| 09/24/1991 | US5050682 Coupling apparatus for a tubing and wireline conveyed method and apparatus |
| 09/24/1991 | CA2037449A1 Drill pipe with helical ridge for highly angulated wellbore |
| 09/24/1991 | CA1289589C Joints for tubular members |
| 09/24/1991 | CA1289466C Air chamber actuated dual tubing release assembly |
| 09/24/1991 | CA1289391C Joining metal tubes |
| 09/19/1991 | WO1991014124A1 Composite tubular member with multiple cells |
| 09/19/1991 | WO1991014074A1 Composite rod-stiffened pressurized cable |
| 09/19/1991 | WO1991014072A1 Composite rod-stiffened wireline cable for transporting well tool |
| 09/18/1991 | EP0447382A1 Clamp for metal bars |
| 09/18/1991 | CN2084977U Dual-wall drill rod for anti-circulation drilling of pneumatic hidden-hole hammer |
| 09/17/1991 | US5048871 Screwed pipe joint |
| 09/17/1991 | US5048619 Down-hole bearing assemblies |
| 09/17/1991 | CA2038111A1 Clamp for metal bars |
| 09/17/1991 | CA1289061C Pipe connector and method of applying same |
| 09/17/1991 | CA1289058C Subsea riser for multiple bore wells |
| 09/17/1991 | CA1289056C Method and apparatus for multi-stage cementing of a well casing |
| 09/11/1991 | EP0414891A4 Method and device for trench-free laying of pipelines |
| 09/11/1991 | CN1054471A Method for making and selecting sealing ring of pipes in oil well |
| 09/10/1991 | WO1991014073A1 Thread friction locking device |
| 09/10/1991 | US5046896 Inflatable buoyant near surface riser disconnect system |
| 09/10/1991 | CA2081363A1 Thread friction locking device |
| 09/05/1991 | WO1991013235A1 Device for delivering corrosion or deposition inhibiting agents into a well by means of an auxiliary delivery tube |
| 09/04/1991 | CN2084102U Bidirectional drill rod for mining |
| 09/04/1991 | CN1013783B Joining of hollow drill rads |
| 09/04/1991 | CN1013782B Sucker rods of gear or rack form underground extended-range device |
| 09/03/1991 | US5044828 Support tower for offshore well |
| 09/03/1991 | US5044826 Method and apparatus for umbilical hydraulic control lines in floating production systems |
| 09/03/1991 | US5044676 Tubular threaded connector joint with separate interfering locking profile |
| 09/03/1991 | US5044438 Wellhead bowl protector and retrieving tool |
| 09/03/1991 | US5044437 Method and device for performing perforating operations in a well |
| 09/03/1991 | CA1288453C Pipe connectors |
| 08/27/1991 | US5042960 Method for supporting offshore well caisson |
| 08/27/1991 | US5042600 Drill pipe with helical ridge for drilling highly angulated wells |
| 08/27/1991 | US5042597 Horizontal drilling method and apparatus |
| 08/27/1991 | CA1288064C Screw thread protection |
| 08/22/1991 | WO1991012410A1 Pipework for constructing a ground water measuring point |
| 08/22/1991 | WO1991012406A1 A down-the-hole drill tool for drilling in advance of a casing tube |
| 08/21/1991 | CN2083187U Conical slip-type square elevator for pumping rods |
| 08/20/1991 | US5040622 Variable depth grooved drill string member |
| 08/20/1991 | US5040620 Methods and apparatus for drilling subterranean wells |
| 08/20/1991 | US5040619 Wireline supported perforating gun enabling oriented perforations |
| 08/20/1991 | US5040602 Inner string cementing adapter and method of use |
| 08/20/1991 | CA2027969A1 Drill tube |
| 08/20/1991 | CA1287848C Equipment for rod string, namely a drill string, having a coupling with a side light for insertion of a cable |
| 08/14/1991 | EP0441686A1 Sealed connection device for two identical pipes |
| 08/13/1991 | USRE33660 Apparatus for drilling a curved borehole |
| 08/13/1991 | US5040154 Method of monitoring the state of extended shell |
| 08/13/1991 | US5039253 Method for trenchless laying of pipes and an arrangement for carrying out the method |
| 08/13/1991 | US5038874 Drill bit having a flushing medium channel |
| 08/13/1991 | US5038872 Drill steering apparatus |
| 08/13/1991 | US5038865 Method of and apparatus for protecting downhole equipment |
| 08/13/1991 | CA1287568C Flexible riser system |
| 08/07/1991 | EP0440123A1 Apparatus for transmitting signals in a bore-hole |
| 08/07/1991 | EP0439600A1 Drill. |