| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 01/07/1999 | EP0888491A1 Hydraulic sliding side-door sleeve |
| 01/07/1999 | EP0888490A2 Mill for wellbore milling operations |
| 01/07/1999 | EP0647301B1 Pressure relief valve |
| 01/02/1999 | CA2242027A1 Downhole lubricator for installation of extended assemblies |
| 12/30/1998 | WO1998059150A2 Method of manufacturing a curved flapper |
| 12/30/1998 | CN1203648A Piston valve |
| 12/29/1998 | CA2053245C Well control apparatus |
| 12/23/1998 | EP0766775B1 Logging or measurement while tripping |
| 12/17/1998 | WO1998057083A1 Water well recharge throttle valve |
| 12/17/1998 | WO1998057029A1 Pressure equalizing safety valve for subterranean wells |
| 12/17/1998 | WO1998057028A1 Casing annulus remediation system |
| 12/17/1998 | WO1998039547A3 Integrated power and control system |
| 12/15/1998 | US5848646 Well completion apparatus for use under pressure and method of using same |
| 12/10/1998 | WO1998055732A1 Pressure equalizing safety valve for subterranean wells |
| 12/10/1998 | CA2264759A1 Pressure equalizing safety valve for subterranean wells |
| 12/08/1998 | US5845669 For pressure relief of a downhole tool body prior to disassembly |
| 12/03/1998 | WO1998054439A1 Downhole pressure activated device and a method |
| 12/01/1998 | US5842521 Downhole pressure relief valve for well pump |
| 11/24/1998 | US5839866 Mechanical overload protection device |
| 11/19/1998 | WO1998051949A1 Downhole hydrocarbon pump |
| 11/19/1998 | WO1998035131A3 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 11/18/1998 | EP0877853A2 Downhole valve |
| 11/18/1998 | CN2297534Y Compensating oil well head exhaust valve |
| 11/12/1998 | WO1998050681A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 11/12/1998 | WO1998050680A2 Monitoring of downhole parameters and tools utilizing fiber optics |
| 11/11/1998 | EP0876546A1 Completions insertion and retrieval under pressure (cirp) apparatus including the snaplock connector |
| 11/10/1998 | US5832996 Electro hydraulic downhole control device |
| 11/04/1998 | EP0875659A2 Valve for use in a subterranean well |
| 11/03/1998 | US5831156 Downhole system for well control and operation |
| 11/03/1998 | US5829952 Check valve with a reversible valve ball and seat |
| 11/03/1998 | US5829525 Bypass tool |
| 11/01/1998 | CA2236457A1 Pressure activated switch valve |
| 10/29/1998 | WO1998048143A1 Downhole surge pressure reduction system and method of use |
| 10/28/1998 | CN2295848Y Underwell pollutionproof device for sucking well |
| 10/28/1998 | CN2295847Y Screw rod pump well-cleaning valve |
| 10/27/1998 | US5826662 Apparatus for testing and sampling open-hole oil and gas wells |
| 10/27/1998 | US5826661 Linear indexing apparatus and methods of using same |
| 10/27/1998 | US5826660 Method of operating a valve adapted to be disposed in a wellbore |
| 10/27/1998 | US5826657 Selectively locking open a downhole tester valve |
| 10/27/1998 | US5826652 Packer-setting assembly |
| 10/20/1998 | US5823273 Well stabilization tools and methods |
| 10/20/1998 | US5823265 For production of oil or gas |
| 10/20/1998 | US5823263 Method and apparatus for remote control of multilateral wells |
| 10/20/1998 | US5823254 Well completion tool |
| 10/15/1998 | WO1998045732A1 Pressure impulse telemetry apparatus and method |
| 10/15/1998 | WO1998045731A1 High impact communication and control system |
| 10/14/1998 | EP0870901A2 Downhole tool |
| 10/14/1998 | EP0870898A1 Method for injection treatment of a formation of little deformability and sleeve for use with the method |
| 10/14/1998 | CN2294330Y Sleeve rubbing type oil discharging device |
| 10/13/1998 | US5819853 Rupture disc operated valves for use in drill stem testing |
| 10/13/1998 | CA2114619C Improved sub-sea test tree apparatus |
| 09/30/1998 | EP0866911A1 Improved measurement port coupler and probe interface |
| 09/29/1998 | US5813460 Formation evaluation tool and method for use of the same |
| 09/29/1998 | US5813457 Wellbore cementing system |
| 09/24/1998 | WO1998041811A1 Device to facilitate the placing of slurries in up-holes |
| 09/23/1998 | EP0865564A1 Down hole bypass valve |
| 09/22/1998 | US5810087 Formation isolation valve adapted for building a tool string of any desired length prior to lowering the tool string downhole for performing a wellbore operation |
| 09/22/1998 | US5810084 Gravel pack apparatus |
| 09/22/1998 | US5810083 For utilization in a subterranean wellbore |
| 09/15/1998 | US5807082 Automatic downhole pump assembly and method for operating the same |
| 09/15/1998 | US5806599 Method for accelerating production |
| 09/15/1998 | US5806596 One-trip whipstock setting and squeezing method |
| 09/15/1998 | US5806563 Dual ball valve assembly |
| 09/15/1998 | CA2093899C Shut-in tools |
| 09/11/1998 | WO1998039548A1 Subsea manifold stab with integral check valve |
| 09/11/1998 | WO1998039547A2 Integrated power and control system |
| 09/08/1998 | US5803431 Shearing gate valve |
| 09/08/1998 | US5803177 Well treatment fluid placement tool and methods |
| 09/08/1998 | US5803167 Computer controlled downhole tools for production well control |
| 09/02/1998 | EP0861968A2 Annulus pressure responsive tool apparatus |
| 09/01/1998 | US5799949 Annular chamber seal |
| 08/27/1998 | WO1998037346A1 Bi-directional rotary output actuator |
| 08/27/1998 | WO1998022689A3 Whipstock |
| 08/26/1998 | CN1191264A Stuffing box with air bag |
| 08/19/1998 | EP0859123A2 Method and apparatus for completing wells with lateral branches |
| 08/19/1998 | EP0858548A1 Inflow regulation device for a production pipe for production of oil or gas from an oil- and/or gas reservoir |
| 08/18/1998 | US5795474 Method and apparatus for the separation of hazardous waste from groundwater |
| 08/18/1998 | US5794699 Metal-to-metal sliding side door for wells |
| 08/18/1998 | CA2148649C Mechanical lockout for pressure responsive downhole tool |
| 08/13/1998 | WO1998035131A2 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 08/11/1998 | US5791418 Tools for shallow flow wellhead systems |
| 08/11/1998 | US5791414 Early evaluation formation testing system |
| 08/06/1998 | WO1998034007A1 Tool and method for drilling a lateral well |
| 08/05/1998 | EP0856636A2 Method and apparatus for testing and sampling open-hole oil and gas wells |
| 08/05/1998 | EP0558534B1 Well completion system |
| 08/04/1998 | US5787979 Plug system for wellbore operations |
| 08/04/1998 | US5787978 Multi-face whipstock with sacrificial face element |
| 08/03/1998 | CA2228728A1 Frangible pressure seal |
| 07/29/1998 | EP0855492A2 Downhole tool apparatus |
| 07/29/1998 | EP0855491A2 Subterranean wellbore tool |
| 07/29/1998 | EP0854967A2 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 |
| 07/28/1998 | US5785124 Method for accelerating production |
| 07/23/1998 | CA2227350A1 Apparatus and method for selectively locking a downhole tester valve in an open position |
| 07/21/1998 | US5782305 Method and apparatus for removing fluid from production tubing into the well |
| 07/21/1998 | US5782304 Normally closed retainer valve with fail-safe pump through capability |
| 07/21/1998 | US5782303 For opening one or more drain holes in a well bore |
| 07/15/1998 | EP0852654A1 Plug comprising a disc valve |
| 07/15/1998 | EP0852653A1 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 07/08/1998 | EP0851967A1 Single bore riser system |
| 07/08/1998 | EP0851965A2 Simplified xmas tree using sub-sea test tree |