| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 06/03/1999 | WO1999027226A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |
| 06/03/1999 | CA2311362A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |
| 06/02/1999 | EP0919693A2 Pressure responsive well tool with intermediate stage pressure position |
| 06/02/1999 | EP0918918A1 Variable orifice gas lift valve for high flow rates with detachable power source and method of using |
| 06/01/1999 | CA2254621A1 Pressure responsive well tool with intermediate stage pressure position |
| 05/27/1999 | WO1999025950A1 Plunger lift controller |
| 05/27/1999 | CA2278466A1 Plunger lift controller |
| 05/25/1999 | US5906238 Downhole flow control devices |
| 05/25/1999 | US5906220 For a subsurface safety valve |
| 05/25/1999 | CA2134273C Spoolable coiled tubing completion system |
| 05/19/1999 | EP0916805A2 Apparatus and method for stimulating a subterranean well |
| 05/19/1999 | EP0916015A2 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 05/14/1999 | WO1999023352A1 Backflow prevention valve |
| 05/14/1999 | WO1999023348A1 Method and apparatus for moving a diverter housing |
| 05/12/1999 | EP0915230A2 Safety valve utilizing an isolation valve |
| 05/12/1999 | CN2318393Y Integral Christmas tree with side wing |
| 05/11/1999 | US5901796 Circulating sub apparatus |
| 05/06/1999 | WO1999022114A1 Method and apparatus for shutting in a well while leaving drill stem in the borehole |
| 05/06/1999 | WO1999022112A1 Downhole cutting separator |
| 04/29/1999 | WO1999020869A2 Equalizing subsurface safety valve with injection system |
| 04/29/1999 | WO1999005387A3 Variable choke for use in a subterranean well and method of controlling a fluid flow |
| 04/28/1999 | EP0910725A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/27/1999 | US5897095 Subsurface safety valve actuation pressure amplifier |
| 04/27/1999 | US5896928 Flow restriction device for use in producing wells |
| 04/27/1999 | US5896924 Computer controlled gas lift system |
| 04/27/1999 | CA2077167C Wellhead isolation tool and method of use |
| 04/22/1999 | WO1999019602A2 Downhole valve |
| 04/21/1999 | CN2315291Y Oil drain device of oi pump |
| 04/20/1999 | US5894890 Normally closed retainer valve with fail-safe pump through capability |
| 04/14/1999 | EP0907821A1 Christmas tree |
| 04/13/1999 | US5893708 Rotating piston for ball and seat valve assembly and downhole pump utilizing said valve assembly |
| 04/13/1999 | US5893415 Gas diversion tool |
| 04/13/1999 | US5893413 Hydrostatic tool with electrically operated setting mechanism |
| 04/08/1999 | WO1999005478A3 Flow measurement mandrel |
| 04/08/1999 | WO1998059150A3 Method of manufacturing a curved flapper |
| 04/07/1999 | EP0906490A2 Downhole apparatus |
| 04/06/1999 | US5890698 Valve having pressure equalizing conduit |
| 04/06/1999 | US5890542 Apparatus for early evaluation formation testing |
| 04/06/1999 | US5890541 BOP isolation test tool |
| 04/06/1999 | US5890540 Downhole tool |
| 04/06/1999 | US5890538 Reverse circulation float equipment tool and process |
| 04/01/1999 | WO1999015760A1 Production fluid control device for oil/gas wells |
| 04/01/1999 | WO1999015759A2 Contamination-safe multi-dose dispensing and delivery system for flowable materials |
| 04/01/1999 | CA2302748A1 Contamination-safe multi-dose dispensing and delivery system for flowable materials |
| 03/30/1999 | US5887668 Wellbore milling-- drilling |
| 03/30/1999 | US5887657 Pressure test method for permanent downhole wells and apparatus therefore |
| 03/24/1999 | EP0903463A2 Formation fracturing and gravel packing tool |
| 03/23/1999 | US5884708 Normally closed retainer valve with fail-safe pump through capability |
| 03/23/1999 | US5884707 Normally closed retainer valve with fail-safe pump through capability |
| 03/23/1999 | US5884705 Equalizing valve seat for a subsurface safety valve |
| 03/23/1999 | US5884703 Normally closed retainer valve with fail-safe pump through capability |
| 03/16/1999 | US5881815 Drilling, production, test, and oil storage caisson |
| 03/11/1999 | WO1999011903A1 Bypass valve for downhole motor |
| 03/10/1999 | EP0900320A1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/10/1999 | EP0769092B1 Hydraulic shifting tool for sliding sleeves |
| 03/10/1999 | CN2310155Y Hydraulic type anchor releasing device |
| 03/10/1999 | CN2310154Y Leakage-proof pipe type oil-pump fixing valve |
| 03/10/1999 | CN2310153Y Constant-pressure heat washing valve |
| 03/09/1999 | US5878812 Misaligning wellhead system |
| 03/04/1999 | WO1999010672A1 Fail-safe closure system for remotely operable valve actuator |
| 03/03/1999 | EP0899419A2 System and method for isolating a zone in a borehole |
| 03/02/1999 | US5875852 Apparatus and associated methods of producing a subterranean well |
| 03/02/1999 | US5875841 Oil well blow-out preventer |
| 02/23/1999 | US5873416 In an offshore structure designed to drill for/produce hydrocarbons |
| 02/23/1999 | US5873415 Completion sub-sea test tree |
| 02/23/1999 | US5873414 Bypass valve for downhole motor |
| 02/20/1999 | CA2245368A1 Main bore isolation assembly for multi-lateral use |
| 02/16/1999 | US5871200 Water well recharge throttle valve |
| 02/16/1999 | US5871050 Well completion method |
| 02/10/1999 | EP0896125A2 Control module system for a subterranean well |
| 02/10/1999 | EP0895561A1 Method and apparatus for remote control of multilateral wells |
| 02/09/1999 | US5868557 For the remediation of a site contaminated with a hazardous substance |
| 02/09/1999 | US5868201 Computer controlled downhole tools for production well control |
| 02/08/1999 | CA2244665A1 Control module system for subterranean well |
| 02/04/1999 | WO1999005478A2 Flow measurement mandrel |
| 02/04/1999 | WO1999005395A1 Full bore variable flow control device |
| 02/04/1999 | WO1999005393A1 Bypass valve closing means |
| 02/04/1999 | WO1999005387A2 Variable choke for use in a subterranean well and method of controlling a fluid flow |
| 02/04/1999 | WO1998050680A3 Monitoring of downhole parameters and tools utilizing fiber optics |
| 02/02/1999 | US5865254 For use in a string of tools |
| 02/02/1999 | US5865252 Method of completing a well |
| 02/02/1999 | US5865251 Isolation system and gravel pack assembly and uses thereof |
| 02/02/1999 | US5865250 Fluid connector with check valve and method of running a string of tubing |
| 02/02/1999 | US5865246 Ball valves |
| 01/28/1999 | WO1999004173A1 Hydraulic fluid actuator with metal to metal seals |
| 01/28/1999 | CA2302376A1 Hydraulic fluid actuator with metal to metal seals |
| 01/27/1999 | EP0893575A2 Flow control apparatus for use in a subterranean well and associated methods |
| 01/27/1999 | EP0893574A2 Flow control apparatus for use in a subterranean well and associated methods |
| 01/26/1999 | US5863152 Mechanical gas vent |
| 01/26/1999 | US5862865 Method of converting an existing well |
| 01/26/1999 | US5862864 Well safety system |
| 01/26/1999 | CA2153643C Sleeve valve flow control device with locator shifter |
| 01/21/1999 | WO1999002817A1 Single-phase annulus-operated sliding sleeve |
| 01/20/1999 | EP0892148A2 Apparatus and method for achieving lock-out of a downhole tool |
| 01/20/1999 | EP0770167B1 Completion sub-sea test tree |
| 01/19/1999 | US5861562 Flow measurement mandrel |
| 01/19/1999 | US5860478 Sub-sea test tree apparatus |
| 01/13/1999 | EP0890783A1 Safety device for a gas storage cavern |
| 01/12/1999 | US5857523 Well completion lubricator valve |
| 01/07/1999 | WO1999000578A1 Apparatus and method for determining integrity of oil well tubing |