| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 05/27/1993 | CA2123897A1 Vacuum apparatus and process for in-situ removing underground liquids and vapors |
| 05/25/1993 | US5213159 Method and apparatus for monitoring well fluid parameters |
| 05/25/1993 | US5213133 Pressure responsive pilot control valve |
| 05/25/1993 | CA1318243C Wellhead valve |
| 05/25/1993 | CA1318241C Above packer perforate test and sample tool and method of use |
| 05/18/1993 | US5211243 Annulus safety valve |
| 05/18/1993 | US5211241 In a conduit |
| 05/13/1993 | DE4136812A1 Subsurface closure of oil or gas riser pipe from deposit - with automatic activation in event of explosion or substantial shock at surface |
| 05/11/1993 | US5209311 Drill string component |
| 05/11/1993 | US5209303 Compressible liquid mechanism for downhole tool |
| 05/04/1993 | US5207275 Annulus safety valve |
| 05/04/1993 | US5207272 Electrically actuated well packer |
| 05/04/1993 | CA1317280C Surface controlled subsurface safety valve |
| 04/28/1993 | EP0539040A2 Downhole casing valve |
| 04/28/1993 | EP0539020A1 Annulus pressure responsive downhole tool |
| 04/27/1993 | US5205361 Up and down travelling disc valve assembly apparatus |
| 04/27/1993 | US5205355 Subsurface safety valves and method and apparatus for their operation |
| 04/22/1993 | CA2081083A1 Low pressure responsive downhole tool with hydraulic lockout |
| 04/20/1993 | US5203410 Blowout safety system for snubbing equipment |
| 04/15/1993 | WO1993007357A1 An apparatus for stopping a blowout from an oil or gas well |
| 04/13/1993 | US5201491 Adjustable well choke mechanism |
| 04/13/1993 | US5201371 Back pressure flapper valve |
| 04/06/1993 | US5199494 For downhole use in a well |
| 03/31/1993 | EP0534732A1 Downhole sampling apparatus |
| 03/31/1993 | EP0534626A1 Multistage choke |
| 03/30/1993 | CA1315194C Tools for treating subterranean wells |
| 03/30/1993 | CA1315192C Gravel packing tool |
| 03/23/1993 | US5195723 Balanced retention valve |
| 03/23/1993 | CA1314807C Valve control system |
| 03/19/1993 | CA2077516A1 Axicage multistage choke |
| 03/18/1993 | WO1993005273A1 Multi-sensor relief valve well test system |
| 03/18/1993 | WO1993003255A3 Tubing test valve |
| 03/18/1993 | CA2115748A1 Multi-sensor relief valve well test system |
| 03/17/1993 | EP0531439A1 Soil displacement hammer with reversing mechanism. |
| 03/16/1993 | US5193621 Bypass valve |
| 03/16/1993 | US5193619 For use in a well test pipe string |
| 03/16/1993 | US5193615 Apparatus for use in controlling flow through a tubing string suspended and packed off within well bore as well as within the annulus between the tubing string and well bore above and below the packer |
| 03/09/1993 | US5191937 Offshore well remote control system |
| 03/09/1993 | US5191933 Wellbore apparatus including a rathole pressure balanced-differential pressure firing system |
| 03/09/1993 | US5191932 Oilfield cementing tool and method |
| 03/09/1993 | CA1314206C Annulus valve for concentric tubing hangers |
| 03/02/1993 | US5190106 Well injection valve retrievable choke |
| 02/23/1993 | US5188183 Method and apparatus for controlling the flow of well bore fluids |
| 02/23/1993 | US5188182 System containing expendible isolation valve with frangible sealing member, seat arrangement and method for use |
| 02/23/1993 | US5188172 Automatic downhole well shut-in control valve |
| 02/18/1993 | WO1993003255A2 Tubing test valve |
| 02/18/1993 | WO1993003253A1 Method and apparatus for isolating a zone of a wellbore and extracting a fluid therefrom |
| 02/18/1993 | CA2115247A1 Tubing test valve |
| 02/17/1993 | EP0527619A1 Wet christmas tree |
| 02/16/1993 | US5186258 Horizontal inflation tool |
| 02/16/1993 | US5186255 Flow monitoring and control system for injection wells |
| 02/08/1993 | CA2075271A1 Casing cementer with torque-limiting rotating positioning tool |
| 02/06/1993 | CA2055874A1 Method and apparatus for isolating a zone of a wellbore and extracting a fluid therefrom |
| 02/04/1993 | WO1993002273A1 Shut-off valve |
| 02/03/1993 | EP0525698A2 Device for collecting measurement samples |
| 02/02/1993 | US5183115 Safety valve |
| 02/02/1993 | US5183114 Sleeve valve device and shifting tool therefor |
| 01/27/1993 | CN1068390A Numerically-controlled output-distributing valve for oil well |
| 01/26/1993 | US5181569 Pressure operated valve |
| 01/21/1993 | WO1993001432A1 Valve arrangement |
| 01/20/1993 | EP0523951A2 Downhole tool with actuator |
| 01/19/1993 | US5180016 Apparatus and method for placing and for backwashing well filtration devices in uncased well bores |
| 01/19/1993 | US5180015 Hydraulic lockout device for pressure controlled well tools |
| 01/19/1993 | US5180007 Low pressure responsive downhold tool with hydraulic lockout |
| 01/19/1993 | US5179973 Valve with pressure assisted closing system |
| 01/16/1993 | CA2073801A1 Shut-in tool with electric timer |
| 01/12/1993 | US5178360 Wire cutting valve actuator |
| 01/12/1993 | US5178216 Wedge lock ring |
| 01/12/1993 | US5178215 Rotary blowout preventer adaptable for use with both kelly and overhead drive mechanisms |
| 01/07/1993 | WO1993000539A1 Valve actuator |
| 01/07/1993 | EP0521667A1 Safety valve sealing ring and seal assembly |
| 01/07/1993 | DE4122392A1 Shut=off equipment for burning oil or gas well - includes bush inserted into well-tubing and fitted with slide valve |
| 01/05/1993 | US5176220 Subsurface tubing safety valve |
| 01/05/1993 | US5176219 Method of sealing holes in the ground |
| 01/05/1993 | US5176164 Flow control valve system |
| 12/30/1992 | EP0520567A1 Erosion resistant valve |
| 12/30/1992 | EP0520566A1 Valve device having stationary and movable or turnable valve bodies |
| 12/30/1992 | EP0520107A1 Running tool for casing hangers |
| 12/30/1992 | CN2126310U Petroleum drilling slurry-pump rotary valvebody |
| 12/30/1992 | CN1067476A Numerally controlled valve group for metering station of oil well |
| 12/30/1992 | CN1019674B Gas pressure balance and safety device in pumping unit |
| 12/23/1992 | CN2125696U Feeding and discharging liquid vaser for deep well pump |
| 12/22/1992 | US5172717 Well control system |
| 12/16/1992 | CN2124996U Sliding bush type constant flow valve |
| 12/15/1992 | US5170846 System and apparatus for controlling a well |
| 12/15/1992 | US5170845 Subsurface safety valves and method and apparatus for their operation |
| 12/15/1992 | US5170844 For use in a tool string |
| 12/09/1992 | EP0517329A1 Hollow auger for casting piles in situ, and drilling device including at least two such augers |
| 12/08/1992 | US5168933 Combination hydraulic tubing hanger and chemical injection sub |
| 12/08/1992 | US5168931 Fluid control valve |
| 12/01/1992 | US5167284 Selective hydraulic lock-out well safety valve and method |
| 12/01/1992 | US5167283 Combination ball valve and annular pipe seal |
| 12/01/1992 | US5167278 Well testing apparatus |
| 11/26/1992 | DE4116761A1 Device for temporary closure of defective oil riser pipe arrangement - has housing with at one end an opening at which housing can be attached to defective arrangement |
| 11/25/1992 | CA2062044A1 Fluid injection and production apparatus and method |
| 11/24/1992 | US5165480 Method and apparatus of locking closed a subsurface safety system |
| 11/19/1992 | EP0513844A1 Operating assembly for a multi-mode testing tool |
| 11/14/1992 | CA2068180A1 Flow actuated safety valve |
| 11/11/1992 | EP0512063A1 Apparatus for inductively coupling signals between a downhole sensor and the surface |
| 11/11/1992 | CA2062865A1 Hydraulically actuated downhole valve apparatus and method for testing formations |