| Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800) |
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| 06/23/1994 | WO1994013928A1 Multi-arm stabilizer for a drilling or boring device |
| 06/22/1994 | EP0479927B1 Drill string component |
| 06/22/1994 | CN2169685Y Automatic diameter adjustable oil pumping rod self seal |
| 06/22/1994 | CN1088283A Cement soil apparatus of underground borer |
| 06/19/1994 | CA2101677A1 Rotary centralizer |
| 06/18/1994 | CA2109854A1 High strength sucker rod coupling |
| 06/15/1994 | EP0601687A1 Boring apparatus |
| 06/15/1994 | EP0506689B1 Drilling tool for widening a bore well |
| 06/15/1994 | EP0494299B1 Casing and flexible tubular duct comprising same |
| 06/15/1994 | CN1087968A Ring seal packer |
| 06/14/1994 | US5320459 Tool bit for percussion drilling and chipping and chuck for the tool bit |
| 06/14/1994 | US5320388 Well tubing liner system |
| 06/14/1994 | US5320182 Downhole pump |
| 06/14/1994 | US5320169 Gauge carrier |
| 06/12/1994 | CA2095202A1 Ring seal packer |
| 06/09/1994 | WO1994012763A1 Anchor with deoperable screw |
| 06/07/1994 | US5318385 Supporting system for lines and conductor pipes at offshore platforms |
| 06/07/1994 | US5318138 Adjustable stabilizer |
| 06/07/1994 | US5318137 Method and apparatus for adjusting the position of stabilizer blades |
| 06/07/1994 | US5318125 Method for continuing measurements after recovery of a measuring tool immobilized in a well |
| 06/07/1994 | US5317780 Blasting and filtration system for use with oil well drill pipe |
| 06/01/1994 | CN2167182Y Anchoring means for drilling |
| 05/31/1994 | US5316094 Well orienting tool and/or thruster |
| 05/31/1994 | US5316093 Fitting for controlled trajectory drilling, comprising a variable geometry stabilizer and use of this fitting |
| 05/31/1994 | CA1329931C Downhole stabilisers |
| 05/26/1994 | WO1994011609A1 Cable clamp for use in a wellbore |
| 05/25/1994 | CN2166214Y Bias-wear protector for rotary sucker rod |
| 05/24/1994 | US5314209 Blast joint for snubbing unit |
| 05/24/1994 | US5314032 Movable joint bent sub |
| 05/24/1994 | US5314014 Packer and valve assembly for temporary abandonment of wells |
| 05/19/1994 | DE4317591C1 Gas-tight pipe-union with threaded male half screwing into tapped socket - has annular groove in threaded portion of one half which accommodates distorting sealing ring |
| 05/18/1994 | EP0466702B1 Coupling for drilling machine with dust extractor |
| 05/18/1994 | EP0437588B1 Assembly comprising an extension tube and a sleeving conduit inside it |
| 05/18/1994 | CN2165224Y Down-hole multifunction device for pumping well |
| 05/18/1994 | CN2165222Y Soft rock drilling rod device |
| 05/17/1994 | US5311954 Process for overcoming drag while installing an element within a cavity |
| 05/17/1994 | US5311953 Drill bit steering |
| 05/11/1994 | WO1994010497A1 Multilayer fire protective coating |
| 05/11/1994 | WO1994010492A1 Improved offshore umbilical and method of forming an offshore umbilical |
| 05/10/1994 | US5310287 Method and device for driving a pile or the like into and out of the ground |
| 05/05/1994 | DE4236737A1 Drilling-rig for blasting holes - has hydraulically-operated reversing drive between boring bar and crown-shaped bit |
| 05/04/1994 | EP0595439A2 Drill pipe breakout device |
| 05/04/1994 | EP0595214A2 Rock drill |
| 05/04/1994 | EP0594935A1 Highly mechanical and corrosion resistant stainless steel and relevant treatment process |
| 05/04/1994 | CN2163860Y 螺杆钻具 Screw drill |
| 05/03/1994 | US5308194 For use with a well located in a body of water |
| 05/03/1994 | US5308150 Cutter head for a rock boring apparatus |
| 05/03/1994 | CA1329193C Tubular element for use in a rotary drilling assembly |
| 04/30/1994 | CA2104924A1 Drill pipe breakout device |
| 04/28/1994 | WO1994009245A1 Bending stiffener |
| 04/28/1994 | WO1994009244A1 Underreamer |
| 04/28/1994 | WO1994009242A1 Method and apparatus for rotating downhole tool in wellbore |
| 04/27/1994 | EP0594420A1 Adjustable stabilizer for drill string |
| 04/27/1994 | EP0594419A1 Adjustable blade stabilizer for drilling system |
| 04/26/1994 | US5306050 Apparatus for internally connecting to coiled tubing |
| 04/26/1994 | US5305838 Device comprising two articulated elements in a plane, applied to a drilling equipment |
| 04/20/1994 | EP0500709B1 Pipe system with electrical conductors |
| 04/20/1994 | EP0466859B1 Pipework for constructing a ground water measuring point |
| 04/19/1994 | US5304073 Electrical connector and pump assembly utilizing same |
| 04/19/1994 | US5303774 Ring seal packer |
| 04/14/1994 | WO1994008168A1 Pipe connecting assembly and method for joining two lengths of steel pipe by a press-fit connection |
| 04/13/1994 | CN2161717Y Centralising trip-proof device for screw rop pump rod |
| 04/13/1994 | CN1024209C Hollow drill rods |
| 04/12/1994 | US5301759 Method and apparatus for core-sampling subsurface rock formations |
| 04/12/1994 | CA1328478C Down-hole bearing assemblies |
| 04/12/1994 | CA1328448C Drilling equipment |
| 04/07/1994 | DE4233304A1 Coupling sleeve for drill or anchor rods - comprises abutment for limiting rod end screwing distance |
| 04/06/1994 | EP0489137B1 Production pipe having an integrated hydraulic line |
| 04/06/1994 | CN2160748Y Steel ball type centralising device for sucker rod |
| 04/06/1994 | CN2160747Y Joint for drilling rod |
| 04/06/1994 | CN2160746Y Tong-type polish rod clip |
| 04/06/1994 | CN2160745Y Trip prevention device for sucker rod |
| 04/06/1994 | CN1084936A Procedure and production pipe for production of oil or gas from an oil or gas reservoir |
| 04/05/1994 | CA2021518C Liner isolation and well completion system |
| 04/05/1994 | CA1328255C Two-piece downhole drill chuck |
| 04/05/1994 | CA1328254C Drill pipes and casings utilizing multi-conduit tabulars |
| 04/05/1994 | CA1328198C Well tool |
| 03/31/1994 | WO1993020288A3 Cut expansion joint sealing device for concrete dams and method for fitting same |
| 03/30/1994 | EP0589586A2 Isolation washpipe for earth well completions and method for use in gravel packing a well |
| 03/29/1994 | US5297943 Electrical submersible pump discharge head |
| 03/29/1994 | US5297640 Drill collar for use in horizontal drilling |
| 03/25/1994 | CA2106921A1 Dedicated perforatable nipple with integral isolation sleeve |
| 03/23/1994 | EP0588421A1 Method and production pipe in an oil or gas reservoir |
| 03/23/1994 | EP0588143A1 Earth drill for placing a concrete pile in situ |
| 03/23/1994 | EP0587675A1 Method and means for driving pipes into the ground and cartridge used therefor and for subsequent pipe blasting. |
| 03/23/1994 | CN2159451Y Fixed sucker rod alianer |
| 03/22/1994 | CA1327966C Method and apparatus for setting an underwater drilling system |
| 03/17/1994 | WO1994005893A1 Drill string coupling |
| 03/16/1994 | EP0586992A1 Tube section having slots for sampling |
| 03/16/1994 | EP0586991A1 Apparatus and method for coupling elongated members |
| 03/16/1994 | EP0586679A1 Clamps for use with well tubulars. |
| 03/15/1994 | US5294923 Method and apparatus for relaying downhole data to the surface |
| 03/15/1994 | US5293945 For use in a well bore |
| 03/15/1994 | CA1327789C Drilling system |
| 03/09/1994 | EP0585315A1 Centraliser. |
| 03/09/1994 | EP0433440B1 Pipe connection for advance working pipes laid underground by an advance working technique |
| 03/09/1994 | CN1083561A Process for producing casing of oil-pumping well |
| 03/03/1994 | WO1994004790A1 Protective arrangements for downhole tools |
| 03/02/1994 | CN1083193A Device for mounting a flexible line comprising a curvature limiter |
| 03/02/1994 | CA2077300A1 Lightweight drill pipe |