| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/18/1996 | WO1996011344A1 A mechanical overload protection device |
| 04/17/1996 | EP0531439B1 Soil displacement hammer with reversing mechanism |
| 04/17/1996 | CN2224913Y Oil-well gate valve |
| 04/10/1996 | EP0705379A1 Tool for use in wellbore operations |
| 04/09/1996 | US5505263 Packer set safety valve for controlling dual fluid flows |
| 04/09/1996 | US5505258 Parallel tubing system for pumping well fluids |
| 04/04/1996 | WO1996010123A1 Surface controlled reservoir analysis and management system |
| 04/03/1996 | EP0704598A2 Tool for use in a wellbore testing string |
| 04/02/1996 | US5503229 Equalizing subsurface safety valve |
| 03/31/1996 | CA2156129A1 Multi-mode well tool with hydraulic bypass assembly |
| 03/27/1996 | EP0703346A2 A floating apparatus for use in a well casing |
| 03/27/1996 | EP0559735B1 Plugs for well logging operations |
| 03/26/1996 | US5501424 Wire cutting insert for gate valve |
| 03/26/1996 | US5501280 For running a casing string into a well bore |
| 03/26/1996 | US5501272 Multi-sensor relief valve well test system |
| 03/26/1996 | US5501242 Pressure relief valve |
| 03/21/1996 | WO1996008635A2 Apparatus for the remote deployment of valves |
| 03/19/1996 | US5499687 Downhole valve for oil/gas well |
| 03/12/1996 | US5497672 Valve actuator |
| 03/10/1996 | CA2157705A1 Equalizing subsurface safety valve |
| 03/05/1996 | US5496044 Annular chamber seal |
| 02/28/1996 | EP0698175A1 Well plugging apparatus and method |
| 02/27/1996 | US5494110 Two-part connector for fluid carrying conduits |
| 02/15/1996 | WO1996004460A1 Apparatus and method for temporarily plugging a tubular |
| 02/13/1996 | US5490564 Pressure change signals for remote control of downhole tools |
| 02/06/1996 | US5488992 Spoolable flexible sliding sleeve |
| 01/31/1996 | EP0613406B1 Vacuum apparatus and process for in-situ removing underground liquids and vapors |
| 01/30/1996 | CA2151410A1 Fluid circulation apparatus |
| 01/24/1996 | CN2218247Y Cellar control gate |
| 01/23/1996 | US5485881 System for accessing liquid in a borehole |
| 01/18/1996 | WO1996001359A2 Logging or measurement while tripping |
| 01/17/1996 | EP0692610A2 Downhole sleeve valve and stimulation tool |
| 01/16/1996 | US5484022 For use in a drill string |
| 01/16/1996 | US5484017 Whipstock assembly for a sleeved casing |
| 01/11/1996 | WO1996000835A1 Well completion lubricator valve |
| 01/11/1996 | CA2193648A1 Well completion lubricator valve |
| 01/09/1996 | US5482119 Multi-mode well tool with hydraulic bypass assembly |
| 01/03/1996 | CN2216587Y Drip |
| 01/02/1996 | US5479991 Reeled tubing deployed packer with control line bypass |
| 01/02/1996 | US5479989 Sleeve valve flow control device with locator shifter |
| 01/02/1996 | US5479988 Mud check valves in drilling apparatus (wells) |
| 01/02/1996 | US5479986 Temporary plug system |
| 12/27/1995 | CN2216141Y Self-filling casing back-pressure valve |
| 12/19/1995 | CA2007461C Whipstock starter mill with pressure drop tattletale |
| 12/13/1995 | EP0686228A1 A downhole tool |
| 12/13/1995 | CN1030513C Numerically-controlled output-distributing valve for oil well |
| 12/12/1995 | US5474128 Telescoping conduits for increasing the fluid resistance of well production tubing inadvertently dropped in an oil or gas well |
| 12/06/1995 | CN2214521Y Water filling well integrated valve |
| 12/06/1995 | CN2214520Y Oil well combined valve |
| 12/06/1995 | CN2214519Y Single wing portal apparatus |
| 12/05/1995 | US5472054 Free pumping apparatus safety valve system and method |
| 12/05/1995 | US5472053 For use in a well casing |
| 11/29/1995 | CN2213840Y Water sealing apparatus for oil product tank |
| 11/22/1995 | CN2213229Y Sand-proof flushing valve |
| 11/22/1995 | CN2213228Y Through plug stick well-flushing valve |
| 11/21/1995 | US5467826 Oilfield tubing string integrally enclosing a fluid production or injection tube and a service line |
| 11/15/1995 | EP0682169A2 Pressur operated apparatus for use in high pressure well |
| 11/15/1995 | EP0681666A1 Valve arrangement |
| 11/14/1995 | US5465794 Hydraulic seal between tubing hanger and wellhead |
| 11/14/1995 | US5465793 Spoolable flexible hydraulic controlled annular control valve |
| 11/14/1995 | US5465787 For interconnection with a wellbore tubing string |
| 11/14/1995 | US5465786 Subsurface tubing safety valve |
| 11/14/1995 | CA2148168A1 High pressure conversion for circulating/safety valve |
| 11/08/1995 | EP0681088A2 Annulus pressure responsive downhole tool |
| 11/08/1995 | EP0681087A2 Temporary plug system for well conduits |
| 11/07/1995 | US5464062 Metal-to-metal sealable port |
| 11/02/1995 | EP0679796A2 Ball valve |
| 10/31/1995 | US5462121 Failsafe liner installation assembly and method |
| 10/31/1995 | US5462117 Tubing conveyed perforating system with fluid loss control |
| 10/31/1995 | US5462114 Shut-off control system for oil/gas wells |
| 10/25/1995 | CN2210950Y Butterfly-type safety valve |
| 10/14/1995 | CA2121179A1 Pump for evacuating water from a gas producing well by pumping the water to a lower water absorption zone |
| 10/10/1995 | US5456322 Coiled tubing inflatable packer with circulating port |
| 10/10/1995 | CA2013786C Flushing means for drilling tools |
| 10/03/1995 | CA2039942C Self actuated intake valve assembly for insert subsurface reciprocating pumps |
| 09/28/1995 | WO1995025874A1 Valve for use in float equipment |
| 09/12/1995 | US5449039 Apparatus and method for horizontal well fracture stimulation |
| 09/05/1995 | US5447201 Well completion system |
| 09/05/1995 | CA1336882C Sliding sleeve valve for the production of bored tube wells |
| 08/30/1995 | EP0668969A1 Sludger. |
| 08/30/1995 | EP0668959A1 Method and apparatus for gravel packing a well |
| 08/29/1995 | US5445225 Choke for enhanced gas and oil well production |
| 08/29/1995 | US5445224 Hydrostatic control valve |
| 08/29/1995 | CA2142917A1 Casing valve |
| 08/24/1995 | WO1995022682A1 Gas lift system with retrievable gas lift valve |
| 08/22/1995 | US5443128 Device for remote actuating equipment comprising delay means |
| 08/22/1995 | US5443124 Hydraulic port collar |
| 08/09/1995 | CN2204853Y Hammering oil discharger |
| 08/09/1995 | CN2204852Y Self-locking shaft collar |
| 08/08/1995 | US5439052 Pitless adapter valve for wells |
| 08/08/1995 | CA2122845A1 Apparatus and method for horizontal well fracture stimulation |
| 08/02/1995 | CN2204330Y Sluice valve for hot oil-production well mouth |
| 08/01/1995 | US5437340 Millout whipstock apparatus and method |
| 07/26/1995 | CN2203999Y Well head arrangement for petroleum prodn. made by cold extrusion welding |
| 07/25/1995 | US5435388 Well plugging apparatus and method |
| 07/25/1995 | CA2060246C Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 07/11/1995 | US5431188 Flow trim for choke |
| 07/06/1995 | WO1995018288A1 A downhole tool |
| 06/29/1995 | WO1995017578A1 Horizontal tree safety valve |
| 06/28/1995 | EP0465543B1 Method and apparatus for monitoring well fluid parameters |