| Patents for E21B 34 - Valve arrangements for boreholes or wells (14,685) |
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| 08/26/2004 | US20040163818 Plug installation system for deep water subsea wells |
| 08/26/2004 | US20040163815 Method for using a reciprocating pump vent-dump valve |
| 08/26/2004 | US20040163811 Fracturing tool having tubing isolation system and method |
| 08/26/2004 | US20040163809 Method and system for determining and controlling position of valve |
| 08/26/2004 | US20040163804 Screen assembly with flow through connectors |
| 08/25/2004 | EP1252440A4 Controlling activation of devices |
| 08/25/2004 | EP1187967B1 Actuator |
| 08/25/2004 | CN2635907Y Hydraulic controllable sleeve |
| 08/25/2004 | CN2635906Y Pressure control valve for downhole leakage detection |
| 08/25/2004 | CN2635905Y Fully automatic controlled throttle and kill line manifold |
| 08/25/2004 | CN2635904Y Theft-proof hand wheel for gate of oil well |
| 08/24/2004 | US6779599 Tubular filling system |
| 08/24/2004 | US6779543 BOP operating system with quick dump valve |
| 08/19/2004 | WO2004070159A2 Apparatus and methods for drilling a wellbore using casing |
| 08/19/2004 | US20040159434 Providing a low pressure condition in a wellbore region |
| 08/19/2004 | US20040159432 Creating an underbalance condition in a wellbore |
| 08/19/2004 | CA2808302A1 Apparatus and methods for drilling a wellbore using casing |
| 08/18/2004 | EP1105621B1 System and method for controlling fluid flow in one or more oil and/or gas wells |
| 08/17/2004 | US6776240 Downhole valve |
| 08/17/2004 | US6776229 Check enhancer |
| 08/17/2004 | US6776228 Ball dropping assembly |
| 08/17/2004 | CA2233437C Apparatus for early evaluation formation testing |
| 08/17/2004 | CA2206806C Formation evaluation tool and method for use of the same |
| 08/17/2004 | CA2206726C Automatic downhole pump assembly and method for use of the same |
| 08/12/2004 | WO2004067908A1 Multi-cycle downhole tool with hydraulic damping |
| 08/12/2004 | WO2004067907A1 Variable choke assembly |
| 08/12/2004 | WO2004005663A3 Tapered ramp positive lock latch mechanism |
| 08/12/2004 | US20040154806 Flow control apparatus for use in a wellbore |
| 08/12/2004 | US20040154803 Subsurface safety valve |
| 08/12/2004 | US20040154798 Zero drill completion and production system |
| 08/11/2004 | EP1445420A2 Oil separation and pumping systems |
| 08/11/2004 | CN2632308Y Sampling valve of producing well top |
| 08/10/2004 | US6772842 Curved flapper valve |
| 08/10/2004 | US6772837 Screen assembly having diverter members and method for progressively treating an interval of a welibore |
| 08/10/2004 | CA2311215C Flow through bypass tubing plug |
| 08/10/2004 | CA2232034C Single bore riser system |
| 08/10/2004 | CA2228439C Method and apparatus for testing and sampling open-hole oil and gas wells |
| 08/05/2004 | US20040149448 Method and device for pressure controlled sequential operation |
| 08/05/2004 | US20040149447 Method and apparatus for controlling downhole flow |
| 08/04/2004 | EP1159510B1 Wellbore primary barrier and related systems |
| 08/04/2004 | CN2630486Y Simple well head device for oil well |
| 08/03/2004 | US6769490 Downhole surge reduction method and apparatus |
| 07/29/2004 | WO2004063607A2 Actuator for well-head valve or other similar applications and system incorporating same |
| 07/29/2004 | WO2004063527A1 Method and apparatus for treating a subterranean formation |
| 07/29/2004 | WO2004011761A3 Rupture disc with non-circular varying depth score line |
| 07/29/2004 | US20040144546 Downhole actuating apparatus and method |
| 07/29/2004 | US20040144543 Wellhead product testing system |
| 07/29/2004 | US20040144530 Toroidal choke inductor for wireless communication and control |
| 07/28/2004 | CN2628708Y Screw pump oil production pipe column pressure test apparatus |
| 07/28/2004 | CN1515782A Water-blending process device |
| 07/27/2004 | CA2200274C Floating apparatus and method for fabricating the apparatus |
| 07/22/2004 | WO2004061264A1 Wellhead completion system having a horizontal control penetrator and method of using same |
| 07/22/2004 | US20040140272 Float has specific gravity greater than material being removed; tube attached penetrates material being removed; pump actuates extraction through tube; windmill power |
| 07/22/2004 | US20040140089 Well screen with internal shunt tubes, exit nozzles and connectors with manifold |
| 07/22/2004 | US20040140088 Variable choke assembly |
| 07/21/2004 | EP1439340A1 Ball valve |
| 07/21/2004 | CN2627206Y Oil field well uniflow eccentric water blocking switch |
| 07/20/2004 | US6763892 Sliding sleeve valve and method for assembly |
| 07/20/2004 | US6763891 Production tree with multiple safety barriers |
| 07/15/2004 | WO2003038228A3 Tubing hanger with ball valve |
| 07/15/2004 | WO2003014604A3 Method and apparatus for replacing bop with gate valve |
| 07/15/2004 | US20040135112 Pressurized seal arrangement |
| 07/15/2004 | US20040135075 Fiber optic based method and system for determining and controlling position of a sliding sleeve valve |
| 07/15/2004 | US20040134687 Expandable reamer apparatus for enlarging boreholes while drilling and methods of use |
| 07/15/2004 | US20040134665 Actuator for well-head valve or other similar applications and system incorporating same |
| 07/15/2004 | US20040134664 Method and apparatus for surge pressure reduction in a tool with fluid motivator |
| 07/14/2004 | CN2625573Y Antifreezing casing constant pressure deflation valve with multiple heat companion means |
| 07/14/2004 | CN2625563Y Anti-theft device for wall head |
| 07/08/2004 | US20040129424 Instrumentation for a downhole deployment valve |
| 07/08/2004 | US20040129423 Downhole tool |
| 07/08/2004 | US20040129422 Apparatus and method for wellbore isolation |
| 07/08/2004 | US20040129421 Filtered actuator port for hydraulically actuated downhole tools |
| 07/07/2004 | EP1252414A4 Method and operating devices having expandable element actuators |
| 07/06/2004 | US6760275 High impact communication and control system |
| 07/06/2004 | US6758277 System and method for fluid flow optimization |
| 07/06/2004 | US6758273 Low-flow groundwater sampling system |
| 07/06/2004 | US6758090 Method and apparatus for the detection of bubble point pressure |
| 07/01/2004 | WO2004055316A2 System and method for fail-safe disconnect from a subsea well |
| 07/01/2004 | WO2004031533A3 Downhole ball dropping apparatus |
| 06/30/2004 | CN2622387Y Flange hanging type oil pipe hanging device |
| 06/29/2004 | US6755252 Downhole surge pressure reduction and filtering apparatus |
| 06/29/2004 | CA2333166C Generating commands for a downhole tool |
| 06/29/2004 | CA2190448C Well casing fill apparatus and methods |
| 06/24/2004 | US20040118568 Wellhead completion system having a horizontal control penetrator and method of using same |
| 06/24/2004 | US20040118567 Technique for maintaining pressure integrity in a submersible system |
| 06/24/2004 | US20040118566 Fluid system component with sacrificial element |
| 06/24/2004 | US20040118564 Method and apparatus for wellbore fluid treatment |
| 06/24/2004 | US20040118563 Technique for preventing deposition products from impeding the motion of a movable component |
| 06/22/2004 | US6752212 Dump valve assembly for selective draining of liquid from an oil well pipe stream |
| 06/17/2004 | US20040112644 Drill string shutoff valve |
| 06/17/2004 | US20040112643 Drill string shutoff valve |
| 06/17/2004 | US20040112641 Drill string shutoff valve |
| 06/17/2004 | US20040112608 Choke valve assembly for downhole flow control |
| 06/17/2004 | US20040112595 Permanent downhole deployment of optical sensors |
| 06/17/2004 | US20040112594 Closed-loop downhole resonant source |
| 06/15/2004 | US6749172 Rotating blowout preventer with independent cooling circuits and thrust bearing |
| 06/15/2004 | CA2240326C Improved measurement port coupler and probe interface |
| 06/13/2004 | CA2640104A1 Apparatus and method of drilling with casing |
| 06/10/2004 | WO2004048748A1 Downhole safety valve for central circulation completion system |
| 06/10/2004 | WO2004025160A8 Fluid system component with sacrificial element |