E21B 34 - Valve arrangements for boreholes or wells

Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685)
11/2004
11/25/2004	US20040231840 Controlling Transient Pressure Conditions In A Wellbore
11/25/2004	US20040231836 Apparatus for releasing a ball into a wellbore
11/25/2004	DE20311032U1 Antriebsvorrichtung Driving device
11/24/2004	EP1478825A1 Tubing hanger with ball valve in the annulus bore
11/24/2004	EP1086293A4 Downhole dump valve
11/24/2004	CN2658390Y Underground fault switch
11/24/2004	CN2658389Y Controller for preventing waste water polluting environment of water well construction
11/24/2004	CN2658388Y Epitaxial concentric test christmas tree
11/24/2004	CN2658384Y Device for changing gas well oil pipe valve
11/24/2004	CN2658377Y Device for changing gas well casing packer
11/23/2004	US6820697 Downhole bypass valve
11/23/2004	CA2347997C Control system for deep set subsurface valves
11/23/2004	CA2281181C Failsafe control system for a subsurface safety valve
11/18/2004	WO2004099558A2 Downhole shut-in tool
11/18/2004	WO2004099549A2 Self-set bridge plug
11/18/2004	US20040226721 Downhole shut-in tool
11/18/2004	US20040226720 Hydraulic control and actuation system for downhole tools
11/18/2004	CA2524330A1 Self-set bridge plug
11/17/2004	CN2656622Y Anti-freezing sample valve for oil well head
11/17/2004	CN2656621Y Dual-purpose anti-freezing valve for well-head pressure-measuring and sampling
11/17/2004	CN2656620Y Oil well casing pipe gas recovery valve
11/16/2004	US6817598 Gun brake device
11/16/2004	US6817416 Flow control device
11/16/2004	US6817412 Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system
11/11/2004	WO2004097167A1 Sand control secreen assembly and treatment method using the same
11/11/2004	WO2004097165A1 Flushing device
11/11/2004	US20040222393 Rotating blowout preventer with independent cooling circuits and thrust bearing
11/11/2004	US20040222020 Rotating blowout preventer with independent cooling circuits and thrust bearing
11/11/2004	US20040221919 Protected integral cylinder valve, gas pressure regulator and flow meter, and method for refilling a gas cylinder so equipped
11/10/2004	CN2654849Y High-efficient right angle restriction device
11/04/2004	WO2004094779A1 Downhole tool
11/04/2004	WO2004094775A2 Screen for blanking plug
11/04/2004	WO2004094769A2 Improved well screen with internal shunt tubes exit nozzles and connectors with manifold
11/04/2004	US20040216868 Self-set bridge plug
11/04/2004	US20040216867 Dump hole dump valve
11/03/2004	EP1473434A1 Underbalanced well completion
11/02/2004	US6811353 Aquifer recharge valve and method
11/02/2004	US6810958 Circulating cementing collar and method
11/02/2004	US6810954 Production flow tree cap
11/02/2004	CA2351159C Float valve assembly for downhole tubulars
11/02/2004	CA2342657C Zero drill completion and production system
11/02/2004	CA2266809C Reverse circulating control valve
11/02/2004	CA2226985C Computer controlled gas lift system
10/2004
10/28/2004	WO2004092528A2 Apparatus for radially expanding and plastically deforming a tubular member
10/28/2004	DE10297236T5 Absperrvorrichtung Shut-off
10/28/2004	CA2523654A1 Apparatus for radially expanding and plastically deforming a tubular member
10/27/2004	CN2651440Y Underwell gate gurgle apparatus
10/27/2004	CN2651439Y Gate gurgle valve of oil piping column
10/27/2004	CN2651438Y Fixed pressure rewashing valve for small diameter well
10/26/2004	US6808020 Debris-free valve apparatus and method of use
10/21/2004	WO2004089608A2 Apparatus for radially expanding and plastically deforming a tubular member
10/21/2004	US20040206513 Sand control for blanking plug
10/21/2004	CA2523500A1 Apparatus for radially expanding and plastically deforming a tubular member
10/20/2004	CN1539066A Valve system and method
10/14/2004	WO2004088091A1 Downhole tool
10/13/2004	CN2648058Y Auto gas distribution valve for thickened oil injecting gas well
10/13/2004	CN2648057Y Anti-back-flow device for oil well
10/12/2004	US6802372 Apparatus for releasing a ball into a wellbore
10/12/2004	CA2354889C Choke valve
10/07/2004	WO2004085793A1 Wellbore annulus flushing valve
10/07/2004	US20040194958 Methods and systems for optical endpoint detection of a sliding sleeve valve
10/05/2004	US6799633 Dockable direct mechanical actuator for downhole tools and method
10/05/2004	CA2288103C Downhole surge pressure reduction system and method of use
09/2004
09/30/2004	US20040188083 Flow completion system
09/29/2004	CN2644658Y Loose-prevention type oil increasing centralizer
09/28/2004	CA2315170C Isolation system for two producing formations
09/28/2004	CA2123533C Electrical connection
09/23/2004	WO2004081422A2 Protected integral cylinder valve, gas pressure regulator and flow meter, and method for refilling a gas cylinder so equipped
09/23/2004	US20040183692 Control apparatus for automated downhole tools
09/22/2004	EP0991887B1 Differential relief valve for flexible sea line
09/22/2004	CN2642990Y Down-hole high pressure blowout prevention mechanical switch
09/22/2004	CN2642989Y Anti-theft valve with wedge-type concealed rod for oil extraction well mouth
09/22/2004	CN2642988Y Anti-theft valve for Christmas tree casing
09/21/2004	US6793019 Tapered ramp positive lock latch mechanism
09/21/2004	CA2700661A1 Gas lift valve
09/21/2004	CA2700642A1 Gas lift valve
09/21/2004	CA2700640A1 Gas lift valve
09/21/2004	CA2700296A1 Gas lift valve
09/21/2004	CA2121636C Hydraulic port collar
09/16/2004	WO2004079158A1 Interchangeable choke assembly
09/16/2004	US20040178001 Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drilling
09/15/2004	EP1456501A2 Method and apparatus for replacing bop with gate valve
09/15/2004	EP1278933B1 Internal gate valve for flow completion systems
09/15/2004	CN2641279Y One-way valve on wellhead of oil prodn. well
09/14/2004	CA2255253C Reduced shock landing collar
09/14/2004	CA2226923C Power management system for downhole control system in a well and method of using same
09/10/2004	WO2004025160A3 Fluid system component with sacrificial element
09/09/2004	US20040173771 Valve closing device
09/09/2004	US20040173362 Electric downhole safety valve
09/09/2004	US20040173352 Gravel packing apparatus having an integrated sensor and method for use of same
09/08/2004	CN2639520Y Deflector-type gas lift valve
09/08/2004	CN2639519Y Snubbing apparatus
09/07/2004	US6786285 Flow control regulation method and apparatus
09/02/2004	WO2004001177A3 Dockable direct mechanical actuator for downhole tools and method
09/02/2004	US20040168800 Method and apparatus for formation damage removal
09/01/2004	CN2637726Y Antifreeze oil well natural gas recovery device
09/01/2004	CN2637712Y Oil well eccentric antitheft thread block
08/2004
08/31/2004	US6782952 Hydraulic stepping valve actuated sliding sleeve
08/26/2004	WO2004072439A1 A device and a method for optional closing of a section of a well
08/26/2004	US20040163820 Bi-directional ball seat system and method

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