| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 04/01/2004 | US20040060704 Flapper closure mechanism |
| 04/01/2004 | US20040060703 Controlled downhole chemical injection |
| 04/01/2004 | US20040060700 Method for drilling and casing a wellbore with a pump down cement float |
| 03/31/2004 | CN2608682Y Oee-way valve for pipeline |
| 03/31/2004 | CN2608681Y Automatic reset oil drain apparatus for oil field electric submerged pump production oil well |
| 03/31/2004 | CN2608680Y Well head antifrozen multifunction sampling valve |
| 03/30/2004 | US6712150 Partial coil-in-coil tubing |
| 03/25/2004 | WO2004025160A2 Fluid system component with sacrificial element |
| 03/25/2004 | WO2004025074A1 Apparatus and method for installation of subsea well completion systems |
| 03/25/2004 | US20040056224 Safety valve with releasable flow tube for flapper lockout |
| 03/25/2004 | US20040055753 Downhole ball dropping apparatus |
| 03/25/2004 | US20040055751 Alternate path multilateral production/injection |
| 03/25/2004 | US20040055749 Remote intervention logic valving method and apparatus |
| 03/25/2004 | US20040055746 Subterranean well completion incorporating downhole-parkable robot therein |
| 03/25/2004 | US20040055743 Reciprocating pump dump valve |
| 03/24/2004 | CN2607439Y Reversely mounted one-way valve |
| 03/23/2004 | US6710720 Pressure impulse telemetry apparatus and method |
| 03/23/2004 | US6708946 Ball valve |
| 03/18/2004 | WO2004022908A1 A completion having an annulus valve |
| 03/18/2004 | WO2004022907A1 Ball operated by-pass tool for use in drillstring |
| 03/18/2004 | WO2004022906A1 Dart-operated big bore by-pass valve |
| 03/18/2004 | WO2003067017A3 Plug installation system for deep water subsea wells |
| 03/18/2004 | US20040050555 System and method for controlling downhole tools |
| 03/18/2004 | US20040050217 Erosion resistant, self and/or artificial external cleaning solid exclusion system |
| 03/17/2004 | EP1398457A2 Method and apparatus for remote control of multilateral wells |
| 03/17/2004 | EP0698175B1 Well plugging apparatus and method |
| 03/16/2004 | US6705593 Valve closing device |
| 03/16/2004 | CA2271459C Method for accelerating production |
| 03/16/2004 | CA2221152C Downhole flow control devices |
| 03/11/2004 | WO2004020784A2 Throttle device |
| 03/11/2004 | US20040046143 Device for an opening in an outer sleeve of a sleeve valve and a method for the assembly of a sleeve valve |
| 03/11/2004 | US20040045722 Safety valve for oil wells |
| 03/11/2004 | US20040045718 Liner hanger with sliding sleeve valve |
| 03/11/2004 | US20040045714 Downhole milling machine and method of use |
| 03/11/2004 | US20040045709 Downhole zone isolation system |
| 03/10/2004 | EP0938622B1 Method for accelerating production - c-i-p ii |
| 03/10/2004 | CN1141490C Multifunctional stratum protecing valve |
| 03/09/2004 | US6702204 Cavitating jet |
| 03/09/2004 | US6702025 Hydraulic control assembly for actuating a hydraulically controllable downhole device and method for use of same |
| 03/09/2004 | US6702020 Crossover Tool |
| 03/09/2004 | US6702013 Multiport gate valve assembly for flow completion system |
| 03/04/2004 | WO2004018833A1 Shape memory actuated valve |
| 03/04/2004 | US20040041120 Sleeve valve for controlling fluid flow between a hydrocarbon reservoir and tubing in a well and method for the assembly of a sleeve valve |
| 03/04/2004 | US20040040719 Plug concealment and diversion tool |
| 03/04/2004 | US20040040718 Downhole injection system |
| 03/03/2004 | EP1394354A2 Hydraulic well control system |
| 03/03/2004 | EP0900320B1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/02/2004 | US6698976 Grouting pipe equipment and method of grouting using the same for an underground water well |
| 03/02/2004 | US6698520 Light-intervention subsea tree system |
| 03/02/2004 | US6698514 Remote operated coil connector apparatus |
| 02/26/2004 | US20040035586 Mechanically opened ball seat and expandable ball seat |
| 02/26/2004 | US20040035583 Wave seal to resist extrusion during equalization |
| 02/26/2004 | US20040035577 Downhole flow meter |
| 02/25/2004 | CN2604520Y Single-flow drip |
| 02/25/2004 | CN2604519Y Anti-going into oil ball base |
| 02/25/2004 | CN2604517Y Oil layer protector |
| 02/24/2004 | US6695061 Downhole tool actuating apparatus and method that utilizes a gas absorptive material |
| 02/24/2004 | US6695049 Valve assembly for hydrocarbon wells |
| 02/21/2004 | CA2437635A1 Method and apparatus for wellbore fluid treatment |
| 02/18/2004 | CN2603846Y Superpressure hydraulic control reversing slide valve |
| 02/17/2004 | US6691787 Gas operated pump for use in a wellbore |
| 02/17/2004 | US6691786 Inflatable flow control device and method |
| 02/17/2004 | US6691785 Isolation valve |
| 02/17/2004 | US6691587 Actuator |
| 02/17/2004 | CA2160676C Well plugging apparatus and method |
| 02/12/2004 | WO2004013461A1 Gravel pack crossover tool with check valve in the evacuation port |
| 02/12/2004 | WO2004013457A2 Electric power control for sickline operations in wellbores |
| 02/12/2004 | WO2003010412A3 Sand control seal for subsurface safety valve |
| 02/12/2004 | US20040026091 Tubing fill and testing valve |
| 02/12/2004 | US20040026087 Subsurface safety valve and method for communicating hydraulic fluid therethrough |
| 02/12/2004 | US20040026085 Cyclic check valve for coiled tubing |
| 02/12/2004 | US20040026084 Recovery of production fluids from an oil or gas well |
| 02/12/2004 | US20040026078 Remote operated tool string deployment apparatus |
| 02/12/2004 | US20040026076 Method and system of fluid analysis and control in hydrocarbon well |
| 02/12/2004 | DE10327123A1 Vorrichtung zur oberirdischen Steuerung eines unterirdischen Sicherheitsventils und Verfahren zum Erkennen eines undichten Stellgliedes dieser Vorrichtung An apparatus for controlling an above-ground underground safety valve and method for detecting a leaking actuator of this device |
| 02/10/2004 | US6688389 Apparatus and method for locating joints in coiled tubing operations |
| 02/06/2004 | CA2436637A1 Wave seal to resist extrusion during equalization |
| 02/06/2004 | CA2436450A1 Remote operated tool string deployment apparatus |
| 02/05/2004 | WO2004011770A2 Apparatus for releasing a ball into a wellbore |
| 02/05/2004 | WO2004011769A1 Fast valve actuator and tool provided with same |
| 02/05/2004 | WO2004011761A2 Rupture disc with non-circular varying depth score line |
| 02/05/2004 | US20040020832 Sand control screen assembly and treatment method using the same |
| 02/05/2004 | US20040020709 Slickline power control interface |
| 02/05/2004 | US20040020657 Multiple interventionless actuated downhole valve and method |
| 02/05/2004 | US20040020652 Multi zone isolation tool having fluid loss prevention capability and method for use of same |
| 02/05/2004 | US20040020641 Apparatus for releasing a ball into a wellbore |
| 02/05/2004 | US20040020636 Downhole valve |
| 02/05/2004 | US20040020635 Apparatus and method for locating joints in coiled tubing operations |
| 02/03/2004 | US6684958 Flapper lock open apparatus |
| 02/03/2004 | US6684951 Sand screen with integrated sensors |
| 02/03/2004 | US6684950 System for pressure testing tubing |
| 02/03/2004 | US6684946 Gas-lock re-prime device for submersible pumps and related methods |
| 01/29/2004 | WO2004009955A1 Method and apparatus for causing pressure variations in a wellbore |
| 01/29/2004 | US20040016549 Method and apparatus for causing pressure variations in a wellbore |
| 01/29/2004 | CA2849659A1 Method and apparatus for causing pressure variations in a wellbore |
| 01/29/2004 | CA2728820A1 Method and apparatus for causing pressure variations in a wellbore |
| 01/28/2004 | EP1383985A1 Wellhead product testing system |
| 01/27/2004 | US6681852 Tubing hanger shuttle valve |
| 01/27/2004 | US6681850 Flow completion system |
| 01/22/2004 | WO2004007903A1 Method and apparatus for locking out a subsurface safety valve |