Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings
Patents for E21B 17 - Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Casings; Tubings (27,800)
08/1991
08/07/1991EP0439484A1 Float collar and plug for use in wells
08/07/1991CN1013455B Screw-threaded joint for pipes
08/06/1991US5036920 Gravel pack well completion with auger-screen
08/01/1991CA2035412A1 Double walled drill pipe electrical conductor
07/1991
07/31/1991EP0439279A1 Drill pipe/casing protector
07/31/1991EP0438920A1 Dry pneumatic system for hard rock shaft drilling
07/30/1991US5035285 Electrically conductive
07/30/1991CA1287160C Method and device for the installation of seismic sensors in a producer oil well
07/30/1991CA1286998C Modular wireline tool connector with swivel coupling
07/30/1991CA1286984C Spring bow, centralizer, and related methods
07/30/1991CA1286982C Hydraulic stabilizer for bore hole tool
07/25/1991DE4007408C1 Gas-tight pipe connector for oil fields - in which symmetrical PTFE ring is formed between tapered plug and socket that screw together
07/24/1991EP0437588A1 Assembly comprising an extension tube and a sleeving conduit inside it.
07/24/1991CN2081431U Pressurization casinghead
07/24/1991CN2081430U Inverted button sucker rod mousing unit
07/24/1991CN1053279A Hydraulic release oil tool
07/24/1991CN1053278A Well casing flotation device and method
07/23/1991US5033808 Quick disconnect fiber optic feedthrough for well borehole usage
07/23/1991US5033558 Well tool for use with down-hole drilling apparatus
07/23/1991CA1286601C Wellbore cleanout apparatus and method
07/23/1991CA1286598C Apparatus for monitoring a parameter in a well
07/19/1991CA2014851A1 Pipe coupling
07/18/1991WO1991010806A1 Centralizers for oil well casings
07/18/1991DE4000691A1 Eccentric deep hammer drill - consists of asymmetrical casing for eccentric drill activated by piston
07/17/1991EP0437084A2 A connector
07/16/1991CA1286281C Method for reducing friction in drilling operations
07/10/1991EP0436417A2 A tubing and wireline conveyed perforating method and apparatus
07/10/1991EP0436046A1 Shock absorbing means for a core drillstring at the drilling site
07/10/1991CN2080554U Window opening type centralizer with straight wing-panel for drill tool
07/09/1991US5029906 Method and apparatus for forming a ventable seal
07/05/1991CA2027919A1 Drill stem arrangement and method
07/04/1991DE4018842C1 Drill pipe assembly for counterbore tool - comprises an outer pipe contg. 2 inner pipes forming a connecting piece with a socket end and a plug end
07/03/1991EP0435721A1 Assembly permitting an electrical connection through a conduit formed of several elements
07/03/1991EP0435447A1 Improvements in or relating to rotary drill bits
07/03/1991EP0435430A1 Method of and apparatus for protecting downhole equipment
07/03/1991CN2080097U Connection of petroleum wellhead casing pipe and pipe head
07/02/1991US5028081 Connection for pipes of composite materials
07/02/1991CA1285584C Method and apparatus for forming a ventable seal
07/02/1991CA1285472C Method and system for maintenance and servicing of subsea wells
06/1991
06/30/1991CA2027967A1 Method of and apparatus for protecting downhole equipment
06/27/1991DE3942030A1 Drill tube with end coupler(s) - has for transfer elements with releasably coupled lower bolt link ring with peripheral claws
06/26/1991EP0433686A1 Fibre-reinforced plastics pipe with threaded end joint section
06/26/1991EP0433440A1 Pipe connection for advance working pipes laid underground by an advance working technique.
06/25/1991US5026436 Stress corrosion cracking resistance, controlled heating, differential cooling of inner and outer surfaces; non-magnetizable drill stems and rod sections
06/25/1991US5026210 Offshore support structure method and apparatus
06/25/1991US5026209 Containment casing for a deep well gravity pressure reactor vessel
06/25/1991US5026200 Releasable connector
06/25/1991US5025864 Casing hanger wear bushing
06/25/1991US5025861 Tubing and wireline conveyed perforating method and apparatus
06/25/1991CA1285187C Aramid composite well riser for deep water offshore structures
06/23/1991CA2032055A1 Oil tool and method for controlling paraffin deposits in flow lines and downhole strings
06/20/1991WO1991009202A1 Drilling tool for widening a bore well
06/19/1991EP0433192A1 Device for running in of threaded couplings for tube assemblies by screwing and unscrewing
06/18/1991US5024272 Drill pipe downhole unthreading apparatus
06/18/1991US5024271 Permanent-magnet wax-proof device
06/16/1991WO1991009203A1 Downhole drill bit and bit coupling
06/16/1991CA2070634A1 Downhole drill bit and bit coupling
06/13/1991WO1991008374A2 Apparatus and method for centralising a casing
06/13/1991WO1991008373A1 Pipe system with electrical conductors
06/13/1991WO1991008372A1 Fire protected pipe and pipeline
06/13/1991WO1991008370A2 Device for steering the foremost part of a drill pipe
06/13/1991CA2069438A1 Pipe system with electrical conductors
06/13/1991CA2067802A1 Device for steering the foremost part of a drill pipe
06/11/1991US5022484 Logging method and apparatus using a sonde equipped with measuring pads
06/11/1991CA1284806C Steel tubing coupling, as well as device and method for manufacturing same
06/05/1991EP0430523A2 Cementing head and swivel well tool
06/05/1991EP0429444A1 A drill for rock and concrete
06/04/1991US5020611 Check valve sub
06/04/1991US5020599 Drilling tool
06/04/1991US5020591 Oil tool coupling device
06/04/1991CA1284678C Assembly for establishing an electrical connection through a duct made of several elements and method for inserting said assembly into said duct
06/02/1991CA2029594A1 Lift-through head and swivel
05/1991
05/29/1991CN2077901U Hollow sucker rod with same diameter
05/28/1991US5018771 Threaded tubular connection
05/28/1991US5018583 Well process using a composite rod-stiffened pressurized cable
05/28/1991US5018582 Hydraulic running and release tool with mechanical emergency release
05/28/1991US5018581 Sand release apparatus and method
05/28/1991US5018575 Apparatus for reducing abrasion and corrosion in mandrels
05/28/1991US5018574 Tubing conveyed wellbore fluid flow measurement apparatus
05/28/1991US5018555 Pre-press tube
05/26/1991CA2030859A1 Rotary drill bits
05/26/1991CA2030858A1 Rotary drill bits
05/22/1991EP0428476A1 Tubular drill
05/21/1991US5017160 Logging instrument used under high pressure and temperature
05/21/1991US5016921 Durable blast joint with hydrostatic driver
05/21/1991CA1284357C Sonde for measuring the electric formation resistivity in earth strata
05/16/1991WO1991007567A1 Tubing conveyed wellbore fluid flow measurement apparatus
05/16/1991CA2045537A1 Tubing conveyed wellbore fluid flow measurement apparatus
05/15/1991EP0427437A1 Apparatus for altering the length of a downhole tool assembly
05/15/1991EP0426788A1 High-pressure pipe string for continuous fusion drilling of deep wells, process and device for manufacturing, propelling and dismantling it.
05/15/1991EP0203074B1 Oilwell tubing connection
05/14/1991CA1284102C High pressure adapter for wellheads
05/08/1991EP0425782A1 Pipe connection for a drill string
05/08/1991EP0353309A4 Method of constructing a well
05/08/1991EP0264446B1 Joint for oil well pipes and method of manufacturing same
05/07/1991US5013191 Cast-in-place piling method and apparatus
05/07/1991US5012878 Rock boring machine drive head with up and down drilling capability
05/07/1991US5012875 Method and apparatus for protecting a shallow-water well
05/07/1991US5012871 Fluid flow control system, assembly and method for oil and gas wells
05/07/1991US5012865 Annular and concentric flow wellhead isolation tool
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