| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 03/15/1994 | US5293943 Safety valve for downhole use in a well |
| 03/15/1994 | US5293937 Acoustic system and method for performing operations in a well |
| 03/08/1994 | US5293551 Monitor and control circuit for electric surface controlled subsurface valve system |
| 03/08/1994 | US5291947 Tubing conveyed wellbore straddle packer system |
| 03/02/1994 | EP0585097A2 Mechanical cementing packer collar |
| 03/02/1994 | EP0584997A2 Downhole tool operating system and method |
| 02/22/1994 | US5287930 Valve apparatus for use in sand control |
| 02/17/1994 | WO1994003704A1 Gravel packing system |
| 02/15/1994 | US5285851 Coiled tubing safety valve and assembly |
| 02/15/1994 | US5285850 Well completion system for oil and gas wells |
| 02/15/1994 | US5285847 For agitating sand and gravel particles within well shafts |
| 02/15/1994 | US5285706 Pipe threading apparatus |
| 02/09/1994 | CN2155428Y Thermodynamic valve |
| 02/08/1994 | US5284209 Coiled tubing cutting modification |
| 02/08/1994 | US5284205 Metal to metal seal for well safety valve |
| 02/02/1994 | EP0581533A2 Stage cementer and inflation packer apparatus |
| 02/01/1994 | CA2101492A1 Stage cementer and inflation packer apparatus |
| 01/31/1994 | WO1993003254A1 Improved sub-sea test tree apparatus |
| 01/26/1994 | CN2154345Y Anti-theft sluice valve |
| 01/18/1994 | US5279370 Mechanical cementing packer collar |
| 01/18/1994 | US5279365 Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 01/18/1994 | US5279363 Actuator apparatus for a downhole tool |
| 01/18/1994 | CA1326206C Method and means for taking measures and/or undertaking works in a well subjected to hydraulic compression |
| 01/11/1994 | US5277262 Hydraulic safety pin and method of operating a pressure-controlled device |
| 01/11/1994 | US5277249 Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 01/11/1994 | US5277248 Ball valve type injector and catcher apparatus with adjustable flow control for catching and retrieving paraffin cutting balls |
| 01/06/1994 | WO1994000709A1 Pressure relief valve |
| 01/05/1994 | CN2152074Y Adjustable diameter water tap |
| 01/04/1994 | US5275241 Circulating valve apparatus and drill stem test method allowing selective fluid communication between an above packer annulus and a rathole |
| 12/28/1993 | US5273113 Controlling multiple tool positions with a single repeated remote command signal |
| 12/28/1993 | US5273112 Surface control of well annulus pressure |
| 12/23/1993 | WO1993025794A1 Well drilling tools |
| 12/22/1993 | EP0575074A1 Remotely operable horizontal connection apparatus |
| 12/22/1993 | CN2150328Y Light weight water tap |
| 12/21/1993 | US5271461 Coiled tubing deployed inflatable stimulation tool |
| 12/21/1993 | CA1325380C Liquid removal method, system and apparatus for hydrocarbon producing wells |
| 12/21/1993 | CA1325368C Process and device for hydraulically and selectively controlling at least two tools or instruments of a device |
| 12/09/1993 | WO1993024730A1 Wellhead |
| 12/08/1993 | EP0572732A1 Wellhead |
| 12/07/1993 | US5267612 Friction plug for a high pressure pipe |
| 11/25/1993 | WO1993023692A1 Valve member and ball valve |
| 11/25/1993 | WO1993023652A1 Drill bit steering |
| 11/25/1993 | CA2135282A1 Drill bit steering |
| 11/24/1993 | EP0417084B1 Blowout preventer |
| 11/23/1993 | US5263847 Subsurface tubing safety valve |
| 11/23/1993 | US5263683 Sliding sleeve valve |
| 11/16/1993 | US5261486 Method and apparatus for gravel pack well completions |
| 11/10/1993 | CN2145864Y Booster mechanical valve |
| 11/10/1993 | CN2145863Y Emergency back-pressure valve and its fast dismounting and mounting tool |
| 11/09/1993 | US5259457 Safety valve, sealing ring and seal assembly |
| 11/09/1993 | US5259456 Drill stem test tools |
| 11/09/1993 | US5259451 Down hole well tool with pressure relief chamber |
| 11/09/1993 | US5259240 Device for in situ testing of soils that includes a vent valve adapted to close at a predetermined depth during installation |
| 11/02/1993 | US5257663 For use in a well |
| 11/02/1993 | CA2007557C Shearing gate valve |
| 10/27/1993 | CN2144708Y Sliding bush type single-current valve |
| 10/26/1993 | US5255745 Remotely operable horizontal connection apparatus and method |
| 10/20/1993 | EP0566382A1 Shut-in tools |
| 10/19/1993 | US5253712 For use in a well |
| 10/19/1993 | US5253706 Release mechanism |
| 10/12/1993 | US5251703 Hydraulic system for electronically controlled downhole testing tool |
| 10/12/1993 | US5251702 Surface controlled subsurface safety valve |
| 10/05/1993 | US5249630 Perforating type lockout tool |
| 09/21/1993 | US5246236 Seal for long-time exposures in oil and gas well tools |
| 09/21/1993 | US5246203 Oilfield valve |
| 09/21/1993 | US5246035 Valve device having stationary and movable or turnable valve bodies |
| 09/15/1993 | EP0559735A1 Plugs for well logging operations. |
| 09/14/1993 | US5244044 Catcher sub |
| 09/08/1993 | EP0559565A1 Electrically controlled latch for well applications |
| 09/08/1993 | EP0558534A1 Well completion system |
| 09/07/1993 | US5242022 Method and apparatus for isolating a zone of wellbore and extracting a fluid therefrom |
| 09/07/1993 | US5241980 Oil field choke apparatus |
| 09/05/1993 | CA2089684A1 Landing nipples |
| 08/31/1993 | US5240072 Multiple sample annulus pressure responsive sampler |
| 08/31/1993 | US5240071 Improved valve assembly apparatus using travelling isolation pipe |
| 08/26/1993 | DE4205152A1 Expansible seal for bore-hole - used for sealant injection into fractured rock e.g. in coal mine |
| 08/24/1993 | US5238070 Differential actuating system for downhole tools |
| 08/17/1993 | US5236047 Electrically operated well completion apparatus and method |
| 08/10/1993 | US5234057 Shut-in tools |
| 08/05/1993 | WO1993015306A1 A subsurface well tool actuator |
| 08/04/1993 | EP0554013A1 Drill stem testing with tubing conveyed perforation |
| 08/04/1993 | EP0553997A2 Sealed joint and seal for well tools |
| 07/27/1993 | US5230383 Electrically actuated well annulus safety valve |
| 07/20/1993 | US5228526 Overflow valve of drill string |
| 07/20/1993 | US5228516 Tester valve |
| 07/20/1993 | CA1320433C Above packer perforate, test and sample tool and method of use |
| 07/14/1993 | EP0551163A1 Control apparatus for downhole tools |
| 07/13/1993 | US5226494 Subsurface well apparatus |
| 07/13/1993 | US5226491 Solenoid operated blanking block valve |
| 07/13/1993 | US5226483 Safety valve landing nipple and method |
| 07/13/1993 | CA1320125C Process and apparatus for handling/steering at least one device within a well casing |
| 06/29/1993 | US5222868 Well pump apparatus with inspection conduit |
| 06/29/1993 | US5222559 Valves |
| 06/15/1993 | CA2021932C Cementing apparatus |
| 06/10/1993 | WO1993011336A1 Mud check valves in drilling apparatus (wells) |
| 06/08/1993 | US5217072 Device for carrying out interventions in nonflowing deflected producing wells |
| 06/08/1993 | CA1318848C Dewaxing apparatus for oil well |
| 05/27/1993 | WO1993010328A1 Downhole tool |
| 05/27/1993 | WO1993010327A1 Two-part connector for fluid carrying conduits |
| 05/27/1993 | WO1993009887A1 Vacuum apparatus and process for in-situ removing underground liquids and vapors |