| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 11/10/1992 | US5161617 Directly installed shut-off and diverter valve assembly for flowing oil well with concentric casings |
| 11/10/1992 | US5161294 Tool device for use in replacing an instrument disposed in a normally inaccesible or dangerous environment |
| 11/04/1992 | EP0511821A2 Well tool bypass apparatus |
| 11/03/1992 | US5159981 Flapper valve |
| 10/31/1992 | CA2067587A1 Bypass valve |
| 10/29/1992 | WO1992018747A1 Injection valve for injecting chemicals and similar liquid substances into subsurface formations |
| 10/28/1992 | CN2120178U Fuel-economizing leakproof flush well bottom valve |
| 10/20/1992 | US5156220 Well tool with sealing means |
| 10/20/1992 | US5156212 Method and system for controlling high pressure flow, such as in containment of oil and gas well fires |
| 10/20/1992 | US5156210 Hydraulically actuated well shifting tool |
| 10/20/1992 | US5156209 Anti blow-out control apparatus |
| 10/20/1992 | US5156207 Hydraulically actuated downhole valve apparatus |
| 10/15/1992 | WO1992017723A1 Handle enclosure for valves |
| 10/13/1992 | US5154228 Valving system for hurricane plugs |
| 10/07/1992 | EP0507498A1 Sleeve valve device and shifting tool therefor |
| 10/07/1992 | CN1018571B Sub-sea valve actuator |
| 10/01/1992 | WO1992016714A1 Apparatus and method for suppressing an uncontrolled blow-out or fire in an oil well |
| 09/24/1992 | DE4108776A1 Hinged cover for oil wells - has pipe with flap held in open position to allow easy flow of oil and which can be easily closed to extinguish burning well |
| 09/22/1992 | US5149984 Electric power supply for use downhole |
| 09/17/1992 | WO1992015768A1 Method of checking that an oil well safety valve is operating correctly |
| 09/16/1992 | CN2116085U Blowout prevention valve for oil well |
| 09/15/1992 | US5146992 Pump-through pressure seat for use in a wellbore |
| 09/15/1992 | CA1307456C Surface read-out tester valve and probe |
| 09/09/1992 | EP0502133A1 Straddle packer for inflatable packer |
| 09/08/1992 | US5145005 Casing shut-in valve system |
| 09/02/1992 | CN2114698U Sprinyless foced back pressure valve |
| 09/01/1992 | US5143158 Subsea wellhead apparatus |
| 09/01/1992 | US5143015 Coiled tubing set inflatable packer, bridge plug and releasing tool therefor |
| 08/26/1992 | EP0500343A1 Downhole tool with hydraulic actuating system |
| 08/26/1992 | EP0500342A1 Downhole tool apparatus actuable by pressure differential |
| 08/26/1992 | EP0500341A1 Downhole tool apparatus actuatable by pressure differential |
| 08/26/1992 | EP0500303A2 Electric power supply apparatus for use downhole |
| 08/25/1992 | US5141057 Safety sleeve for a borehole communicating with an underground reserve of fluid under pressure, and associated safety system, and an associated borehole operating method |
| 08/25/1992 | US5141056 Injection valve for injecting chemicals and similar liquid substances into subsurface formations |
| 08/25/1992 | US5141023 Flow actuated safety valve |
| 08/21/1992 | CA2061576A1 Differential actuating system for downhole tools |
| 08/21/1992 | CA2061561A1 Rechargeable hydraulic power source |
| 08/19/1992 | EP0353275B1 Shut-in tool |
| 08/12/1992 | CN2112683U Cap type valve |
| 08/11/1992 | US5137090 Subsurface tubing safety valve |
| 08/11/1992 | US5137089 Streamlined flapper valve |
| 08/11/1992 | US5137088 Travelling disc valve apparatus |
| 08/11/1992 | US5137087 Casing cementer with torque-limiting rotating positioning tool |
| 08/06/1992 | WO1992006270A3 Valve control apparatus |
| 08/04/1992 | US5135366 Selective valve to pass fluids |
| 07/29/1992 | EP0496540A1 Downhole inflatable packing apparatus |
| 07/28/1992 | US5133407 Fluid injection and production apparatus and method |
| 07/28/1992 | US5133383 Axicage multistage choke |
| 07/28/1992 | CA1305645C Valve mounting and block manifold |
| 07/22/1992 | EP0494981A1 Cementing apparatus |
| 07/21/1992 | US5132904 Remote well head controller with secure communications port |
| 07/21/1992 | US5131473 Controlled rate well cementing tool |
| 07/21/1992 | US5131466 Self actuated intake valve assembly for inlet subsurface reciprocating pumps |
| 07/19/1992 | CA2059573A1 Coiled tubing set inflatable packer, bridge plug and releasing tool therefor |
| 07/09/1992 | WO1992008875A3 Well completion system |
| 07/07/1992 | US5127477 Rechargeable hydraulic power source for actuating downhole tool |
| 07/07/1992 | US5127476 Lockout housing and sleeve for safety valve |
| 07/07/1992 | US5127474 Method and means for stabilizing gravel packs |
| 07/07/1992 | CA1304672C Tubing conveyed sampler |
| 07/07/1992 | CA1304626C Polish rod centralizer |
| 06/30/1992 | US5125457 Resilient seal for curved flapper valve |
| 06/25/1992 | WO1992010639A1 Method and means for stabilizing gravel packs |
| 06/23/1992 | CA1304064C Gate value for air lock |
| 06/23/1992 | CA1303971C Perforating gun firing tool |
| 06/23/1992 | CA1303970C Method and apparatus for perforating well bores using differential pressure |
| 06/17/1992 | CN2107522U Ball surface disk shape reciprocating pump valve |
| 06/11/1992 | WO1992009784A1 Plugs for well logging operations |
| 06/09/1992 | US5119891 Adaptor for drilling strings with controllable air passage |
| 06/02/1992 | US5117913 Chemical injection system for downhole treating |
| 06/02/1992 | US5117910 Packer for use in, and method of, cementing a tubing string in a well without drillout |
| 06/02/1992 | US5117685 Apparatus for testing an oil well, and corresponding method |
| 06/02/1992 | CA1302233C Gaswell dehydrate valve |
| 05/29/1992 | WO1992008875A2 Well completion system |
| 05/20/1992 | EP0486449A1 Drill string component |
| 05/20/1992 | CN2104927U Anti-theft gas valve used for |
| 05/19/1992 | CA1301056C Manual port closing tool for well cementing |
| 05/13/1992 | EP0485243A1 A release mechanism |
| 05/12/1992 | US5111883 Vacuum apparatus and process for in-situ removing underground liquids and vapors |
| 05/12/1992 | CA1300492C Apparatus for treating well bores |
| 05/10/1992 | CA2042658A1 Fail-close hydraulically actuated control choke |
| 05/08/1992 | CA2039943A1 Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps |
| 05/06/1992 | EP0484218A1 Work-over device for non eruptive deviated wells |
| 05/05/1992 | US5109881 Temperature sensitive control valve |
| 05/05/1992 | CA1300003C Wellhead with safety valve for pumping a well |
| 04/29/1992 | EP0482926A2 Downhole tool with hydraulic timer |
| 04/28/1992 | US5108272 Sucker rod pump |
| 04/21/1992 | CA1299094C Oil and gas well diversionary spool assembly |
| 04/16/1992 | WO1992006270A2 Valve control apparatus |
| 04/16/1992 | DE4128252A1 Intake valve for insert subsurface reciprocating pump |
| 04/15/1992 | EP0480584A2 Wellbore tester valve |
| 04/15/1992 | EP0338030B1 Apparatus for maintenance of ball valve |
| 04/14/1992 | US5104301 Subsurface well pump |
| 04/14/1992 | US5103906 Hydraulic timer for downhole tool |
| 04/08/1992 | CN2101104U Hydraulic piston type petroleum tube hot washing valve |
| 04/08/1992 | CN1016203B Well cementing method and manual port closing tool |
| 04/07/1992 | US5101907 Differential actuating system for downhole tools |
| 04/07/1992 | US5101904 Downhole tool actuator |
| 04/02/1992 | WO1992005336A1 Horizontal inflatable tool |
| 04/01/1992 | EP0296207B1 Method and device for taking measurements and/or carrying out interventions in a well subjected to a hydraulic compression |
| 03/31/1992 | US5099919 Plug for well logging operations |