| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 11/13/1997 | WO1997028349A3 Downhole valve |
| 11/11/1997 | US5685372 Temporary plug system |
| 11/11/1997 | CA2106698C Differential pressure operated circulating and deflation valve |
| 11/06/1997 | WO1997041333A1 Method and apparatus for remote control of multilateral wells |
| 11/04/1997 | US5682921 To control flow in a fluid transmission conduit in a subterranean well |
| 10/22/1997 | EP0802304A1 Circulating valve |
| 10/22/1997 | EP0801704A1 Method for injecting fluid into a wellbore |
| 10/21/1997 | US5678633 Shifting tool |
| 10/18/1997 | CA2202726A1 Circulating valve responsive to fluid flow rate therethrough and associated methods of servicing a well |
| 10/14/1997 | US5676208 Method of gravel packing a subterranean well |
| 10/09/1997 | WO1997037102A2 Downhole flow control devices |
| 10/08/1997 | EP0599876B1 Multi-sensor relief valve well test system |
| 10/04/1997 | CA2201661A1 Valve actuator |
| 10/02/1997 | WO1997036089A1 Hydraulic sliding side-door sleeve |
| 10/02/1997 | WO1997036088A1 Actuating ball |
| 09/25/1997 | WO1997035093A1 Method and apparatus using coiled-in-coiled tubing |
| 09/24/1997 | EP0796979A2 Floating apparatus for downhole use and method of making it |
| 09/23/1997 | US5669448 Overbalance perforating and stimulation method for wells |
| 09/23/1997 | CA2172477A1 Dump/stop valve for surface controller subsurface safety valve |
| 09/17/1997 | EP0795091A1 A mechanical overload protection device |
| 09/17/1997 | EP0795074A1 Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 09/10/1997 | EP0794317A2 Apparatus and method for injecting fluids in a well |
| 09/09/1997 | US5664629 Method of providing a time delay for a down-hole tool |
| 09/07/1997 | CA2196933A1 Multipurpose tool |
| 08/26/1997 | US5660234 Shallow flow wellhead system |
| 08/26/1997 | CA2114307C Environmentally secure polished rod liner head |
| 08/21/1997 | WO1997030269A1 Motor drive actuator for downhole flow control devices |
| 08/20/1997 | EP0550569B1 Valve control apparatus |
| 08/20/1997 | CN2260167Y Theft-proof water injection well head equipment |
| 08/12/1997 | US5655607 Downhole tool for pressure testing of oil and gas wells |
| 08/07/1997 | WO1997028349A2 Downhole valve |
| 08/07/1997 | CA2245075A1 Improved downhole apparatus |
| 07/31/1997 | WO1997027382A1 Completions insertion and retrieval under pressure (cirp) apparatus including the snaplock connector |
| 07/30/1997 | EP0786577A2 Sand control screen assembly having an adjustable flow rate and associated methods of completing a subterranean well |
| 07/30/1997 | EP0786044A1 Subsurface safety valve of minimized length |
| 07/25/1997 | CA2195712A1 Sand control screen assembly having an adjustable flow rate and associated methods of completing a subterranean well |
| 07/22/1997 | US5649597 Method for pressure testing a pipe string in a well bore |
| 07/15/1997 | US5647434 Floating apparatus for well casing |
| 07/09/1997 | EP0783075A2 Method and apparatus for producing hydrocarbons |
| 06/26/1997 | WO1997022781A1 Improved measurement port coupler and probe interface |
| 06/26/1997 | WO1997013954A3 Mill for wellbore milling operations |
| 06/24/1997 | US5641245 Apparatus for passive removal of subsurface contaminants |
| 06/24/1997 | US5641023 Shifting tool for a subterranean completion structure |
| 06/24/1997 | US5641021 Well casing fill apparatus and method |
| 06/24/1997 | CA2108914C Formation testing apparatus and method |
| 06/17/1997 | US5638904 Within wells |
| 06/12/1997 | WO1997021020A1 Down hole bypass valve |
| 06/11/1997 | CN1151783A Logging or measurement while tripping |
| 06/10/1997 | US5636694 Hydraulic power stroker for shifting of sliding sleeves |
| 06/10/1997 | US5636661 Self-piloting check valve |
| 05/28/1997 | EP0775804A2 Completely removable bidirectional plug |
| 05/28/1997 | EP0775803A2 Linear indexing apparatus and methods of using same |
| 05/21/1997 | EP0774564A2 Well casing fill apparatus and method |
| 05/21/1997 | EP0596900B1 Valve actuator |
| 05/13/1997 | US5628624 Pump barrel valve assembly including seal/actuator element |
| 05/13/1997 | US5628493 Oilfield valve |
| 05/09/1997 | WO1997016623A1 Inflow regulation device for a production pipe for production of oil or gas from an oil- and/or gas reservoir |
| 05/09/1997 | WO1997011252A3 Simplified xmas tree using sub-sea test tree |
| 05/09/1997 | CA2236264A1 Inflow regulation device for a production pipe for production of oil or gas from an oil- and/or gas reservoir |
| 05/02/1997 | EP0770167A1 Completion sub-sea test tree |
| 04/29/1997 | US5623994 Well head cutting and capping system |
| 04/24/1997 | WO1997014868A1 Purging means for purging upwards in ring spacing between drill pipe and bore hole wall |
| 04/23/1997 | EP0769092A1 Hydraulic shifting tool for sliding sleeves |
| 04/23/1997 | CN2252883Y Bibb for oil field downhole operating |
| 04/17/1997 | WO1997013954A2 Mill for wellbore milling operations |
| 04/16/1997 | EP0767862A1 Well completion lubricator valve |
| 04/09/1997 | EP0766775A1 Logging or measurement while tripping |
| 04/08/1997 | US5618022 Variable orifice valve |
| 04/03/1997 | WO1997012113A1 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 03/30/1997 | CA2186770A1 Apparatus for measuring pressure |
| 03/29/1997 | CA2186173A1 Pressure-actuated valve and method |
| 03/27/1997 | WO1997011253A1 Single bore riser system |
| 03/27/1997 | WO1997011252A2 Simplified xmas tree using sub-sea test tree |
| 03/18/1997 | CA2120798C Annular safety system |
| 03/18/1997 | CA2061571C Hydraulic system for electronically controlled downhole testing tool |
| 03/11/1997 | US5609204 Isolation system and gravel pack assembly |
| 03/11/1997 | US5609178 Pressure-actuated valve and method |
| 03/11/1997 | CA2101982C Selective downhole operating system and method |
| 03/05/1997 | EP0760418A2 Check valve and check valve seat |
| 02/20/1997 | WO1997006344A1 Downhole apparatus |
| 02/20/1997 | WO1997006319A1 Piston valve |
| 02/20/1997 | CA2228840A1 Downhole apparatus |
| 02/19/1997 | CN2247719Y Christmas tree |
| 02/13/1997 | WO1997005362A1 Downhole valve |
| 02/13/1997 | WO1997005361A1 Safeguarded method and apparatus for fluid communication using coiled tubing, with application to drill stem testing |
| 02/13/1997 | WO1996034176A3 Hydraulic shifting tool for sliding sleeves |
| 02/12/1997 | CN2247231Y Manual gate plate blowout preventer |
| 02/06/1997 | WO1997004212A1 System for controlling production from a gas-lifted oil well |
| 02/06/1997 | WO1996027732A3 Shifting tool, releasing mechanism, position feedback method and method of releasing |
| 02/05/1997 | EP0757156A2 Shifting tool for a subterranean completion structure |
| 02/04/1997 | US5598864 Subsurface safety valve |
| 01/29/1997 | EP0756065A1 System for controlling production from a gas-lifted oil well |
| 01/29/1997 | EP0668969B1 Sludger |
| 01/28/1997 | US5597041 Well head cutting and capping system |
| 01/28/1997 | US5597016 Mechanical lockout for pressure responsive downhole tool |
| 01/28/1997 | CA2111736C Surface control of well annulus pressure |
| 01/23/1997 | WO1996038651A3 Method and devices for making safe an oil well in the event of a defect in the hydraulic control line of its bottom safety valve |
| 01/23/1997 | WO1996034175A3 Cementing plug |
| 01/21/1997 | CA2087866C Drill stem testing with tubing conveyed perforation |
| 01/15/1997 | EP0753646A2 Differential pressure test/bypass valve well tool |