| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
|---|
| 11/02/1999 | US5975209 Automatic blanking completion tool |
| 11/02/1999 | US5975204 Method and apparatus for the remote control and monitoring of production wells |
| 10/28/1999 | WO1999054591A1 Controlling multiple downhole tools |
| 10/28/1999 | WO1999054589A1 Improved surface controlled subsurface safety valve downstop seal |
| 10/27/1999 | EP0952303A2 Apparatus positionable in a subterranean well, comprising releasably secured members |
| 10/27/1999 | EP0952300A1 Method and apparatus for drilling a plurality of offshore underwater wells |
| 10/26/1999 | US5971353 Dump/stop valve for surface controlled subsurface safety valve |
| 10/26/1999 | US5971077 Insert tree |
| 10/26/1999 | US5971072 Inductive coupler activated completion system |
| 10/26/1999 | US5971004 Variable orifice gas lift valve assembly for high flow rates with detachable power source and method of using same |
| 10/24/1999 | CA2269402A1 Apparatus having a releasable lock |
| 10/21/1999 | WO1999053170A1 Coated downhole tools |
| 10/20/1999 | EP0950794A2 Apparatus and method for completing a subterranean well |
| 10/20/1999 | EP0795074B1 Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 10/20/1999 | CN2344538Y Sand-resisting standing valve |
| 10/19/1999 | US5967166 Sealing assembly and method |
| 10/13/1999 | EP0948700A2 Whipstock |
| 10/13/1999 | CN2343335Y Sleeve air-release valve |
| 10/12/1999 | US5964296 Formation fracturing and gravel packing tool |
| 10/07/1999 | WO1999050528A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 10/06/1999 | CN2342092Y Built-in sliding sleeve oil draining device |
| 10/06/1999 | CN2342091Y Change valve for wellhead liquid flow |
| 10/05/1999 | US5960884 Gravel pack apparatus |
| 10/05/1999 | US5960883 Power management system for downhole control system in a well and method of using same |
| 10/05/1999 | US5960881 Downhole surge pressure reduction system and method of use |
| 10/05/1999 | US5960879 Methods of completing a subterranean well |
| 10/05/1999 | US5960874 Flow control assembly |
| 09/30/1999 | WO1999049184A1 An apparatus for use in the extraction of oil/gas and methods for use thereof |
| 09/30/1999 | WO1999049180A1 Blowout preventer |
| 09/30/1999 | CA2304732A1 Blowout preventer |
| 09/29/1999 | EP0944766A1 System for controlling and stopping oil drilling fires |
| 09/28/1999 | US5957208 Flow control apparatus |
| 09/28/1999 | US5957207 Flow control apparatus for use in a subterranean well and associated methods |
| 09/28/1999 | US5957206 Plug for operating a downhole device using tubing pressure |
| 09/28/1999 | US5957200 Plunger lift controller |
| 09/28/1999 | US5957199 Natural gas production optimization switching valve system |
| 09/27/1999 | CA2262243A1 Method and apparatus for drilling a plurality of offshore underwater wells |
| 09/23/1999 | WO1999047790A1 Extraction of fluids from wells |
| 09/23/1999 | WO1999047789A1 Pressure actuated downhole tool |
| 09/23/1999 | WO1999047788A1 Well control |
| 09/22/1999 | EP0943781A2 Sub-sea test tree |
| 09/22/1999 | EP0943050A1 Blowout preventer control system |
| 09/21/1999 | US5955666 Satellite or other remote site system for well control and operation |
| 09/21/1999 | US5954135 Method and apparatus for establishing fluid communication within a subterranean well |
| 09/21/1999 | CA2106923C Valve |
| 09/21/1999 | CA2102068C Wellhead isolation tool and method of use |
| 09/16/1999 | WO1999031352A3 Isolation system for two producing formations |
| 09/15/1999 | CN1228826A Swivel |
| 09/14/1999 | US5950733 Formation isolation valve |
| 09/10/1999 | WO1999045231A1 Actuator apparatus and method for downhole completion tools |
| 09/10/1999 | WO1999045228A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 09/10/1999 | CA2322287A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 09/07/1999 | US5947206 Deep-set annulus vent valve |
| 09/07/1999 | US5947205 Subterranean wellbore tool |
| 09/07/1999 | US5947204 Production fluid control device and method for oil and/or gas wells |
| 09/01/1999 | EP0938622A1 Method for accelerating production - c-i-p ii |
| 09/01/1999 | CN2336089Y External shear oil release device |
| 09/01/1999 | CN2336088Y Buffer drill pump valve |
| 08/26/1999 | WO1999011903A9 Bypass valve for downhole motor |
| 08/24/1999 | US5941309 Method of actuating a tool located in a wellbore |
| 08/24/1999 | US5941307 Production well telemetry system and method |
| 08/23/1999 | CA2262318A1 Non-intrusive insert tool control |
| 08/18/1999 | CN2333824Y Anti-freezing casing constant pressure bleed valve |
| 08/17/1999 | US5937945 Computer controlled gas lift system |
| 08/17/1999 | CA2139701C Reeled tubing deployed packer with control line bypass |
| 08/17/1999 | CA2113402C Pressure test and bypass valve with rupture disc |
| 08/12/1999 | WO1999020869A3 Equalizing subsurface safety valve with injection system |
| 08/10/1999 | US5934372 Pump system and method for pumping well fluids |
| 08/10/1999 | US5934371 Remotely controlled shut-off valve and variable choke assembly |
| 08/10/1999 | US5934370 Well water flow diverter apparatus |
| 08/10/1999 | CA2061701C Electric power supply for use downhole |
| 08/04/1999 | EP0932790A1 Undersea hydraulic connector with equalization channel |
| 08/04/1999 | CN2331758Y Multipurpose pressure test device mounted on pithead |
| 08/03/1999 | CA2029529C Casing valve |
| 07/28/1999 | EP0931906A2 Apparatus and method for downhole tool actuation |
| 07/28/1999 | CN2330779Y Suction valve for oil well pumping unit |
| 07/27/1999 | US5927405 For insertion into a well to displace well fluid |
| 07/27/1999 | US5927401 In a central wellbore |
| 07/21/1999 | CN2329762Y Double ball double valve port socking valve for oil-well pump |
| 07/20/1999 | US5924696 Frangible pressure seal |
| 07/20/1999 | US5924490 Well treatment tool and method of using the same |
| 07/13/1999 | US5921318 Method and apparatus for treating multiple production zones |
| 07/07/1999 | EP0927295A2 Wellbore milling system |
| 07/06/1999 | USRE36244 Well plugging apparatus and method |
| 07/06/1999 | US5918858 Undulating transverse interface for curved flapper seal |
| 07/06/1999 | US5918676 Horizontal tree safety valve |
| 07/06/1999 | US5918670 Multi-sensor relief valve well test system |
| 07/06/1999 | US5918669 Method and apparatus for remote control of multilateral wells |
| 07/01/1999 | WO1999019602A3 Downhole valve |
| 06/29/1999 | US5915478 Hydrostatic standing valve |
| 06/24/1999 | WO1999031352A2 Isolation system for two producing formations |
| 06/24/1999 | WO1999031351A1 Well isolation system |
| 06/24/1999 | WO1999031350A1 Tubing plug for operating a downhole device |
| 06/24/1999 | WO1999031349A1 Method and apparatus for cementing casing in a wellbore |
| 06/23/1999 | EP0923690A2 Integrated power and control system |
| 06/16/1999 | EP0750715B1 Valve for use in float equipment |
| 06/10/1999 | WO1999015759A3 Contamination-safe multi-dose dispensing and delivery system for flowable materials |
| 06/09/1999 | EP0920571A1 Swivel |
| 06/08/1999 | US5909771 Wellbore valve |
| 06/03/1999 | WO1999027227A1 Deep-set annulus vent valve |