| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/06/2004 | EP1415150A2 Method for quantitative monitoring of a gas injected into a reservoir in particular in a natural environment |
| 05/06/2004 | CA2722642A1 Drill pipe having an internally coated electrical pathway |
| 05/05/2004 | CN2614270Y Short reinforcing joint for oscillator |
| 05/04/2004 | US6729399 Method and apparatus for determining reservoir characteristics |
| 05/04/2004 | CA2446287A1 System and method for estimating multi-phase fluid rates in a subterranean well |
| 05/04/2004 | CA2297003C Flow measurement mandrel |
| 05/04/2004 | CA2259853C Apparatus and method for determining a drilling mode to optimize formation evaluation measurements |
| 04/29/2004 | WO2004035989A1 Mud pulse landing assembly for use in directional drilling |
| 04/29/2004 | WO2004011775A3 Measurement- while-drilling assembly using real-time toolface oriented measurements |
| 04/29/2004 | US20040081019 Pressure pulse generator for mwd |
| 04/29/2004 | US20040079526 Measurement-while-drilling assembly using real-time toolface oriented measurements |
| 04/29/2004 | US20040079525 Drill pipe having an internally coated electrical pathway |
| 04/29/2004 | US20040079524 Toroidal choke inductor for wireless communication and control |
| 04/28/2004 | EP1412616A1 Dual sensor freepoint tool |
| 04/28/2004 | EP1412605A2 Improved stabilizer for use in a drill string |
| 04/28/2004 | CN1491981A 乙烯共聚物组合物 The ethylene copolymer composition |
| 04/27/2004 | US6728639 Method and apparatus for determining the orientation of a borehole |
| 04/27/2004 | US6727828 Pressurized system for protecting signal transfer capability at a subsurface location |
| 04/27/2004 | US6727827 Measurement while drilling electromagnetic telemetry system using a fixed downhole receiver |
| 04/27/2004 | US6727705 Subsurface monitoring and borehole placement using a modified tubular equipped with tilted or transverse magnetic dipoles |
| 04/27/2004 | US6727704 Boring tool tracking/guiding system and method with unconstrained target location geometry |
| 04/27/2004 | US6725926 Nonradioactive; proppants |
| 04/27/2004 | CA2001745C Downhole combination tool |
| 04/22/2004 | WO2004034089A2 Borehole conductivity profiler |
| 04/22/2004 | WO2004033855A2 Well control using pressure while drilling measurements |
| 04/22/2004 | WO2004033852A1 High data rate borehole telemetry system |
| 04/22/2004 | WO2004033847A1 Apparatus and method for transmitting a signal in a wellbore |
| 04/22/2004 | WO2004033844A2 System and method for installation and use of devices in microboreholes |
| 04/22/2004 | WO2004020790A3 Method and apparatus for logging a well using fiber optics |
| 04/22/2004 | WO2004020774A3 Methods and systems to activate downhole tools with light |
| 04/22/2004 | US20040075566 Apparatus system and method for gas well site monitoring |
| 04/22/2004 | US20040074639 Logging system for use in a wellbore |
| 04/22/2004 | CA2499331A1 Apparatus and method for transmitting a signal in a wellbore |
| 04/21/2004 | EP1409839A1 Method and apparatus for detonating an explosive charge |
| 04/21/2004 | EP1105620B1 Hydraulic well control system |
| 04/21/2004 | CN2612797Y Pressure transposition annular pressure control spherical test switch valve |
| 04/20/2004 | US6725162 Method for determining wellbore diameter by processing multiple sensor measurements |
| 04/20/2004 | US6723375 An operator of the portable locator is able to mark the surface of the ground using the portable locator and while holding the portable locator in generally the same position and/ or stance as the locator is used for locating purposes |
| 04/20/2004 | US6722450 Adaptive filter prediction method and system for detecting drill bit failure and signaling surface operator |
| 04/15/2004 | WO2004032344A2 Battery conservation for downhole telemetry |
| 04/15/2004 | WO2004031537A1 Extracting drilling mode related data from well data logging |
| 04/15/2004 | WO2003087788B1 A method and apparatus for a downhole refractometer and attenuated reflectance spectrometer |
| 04/15/2004 | US20040073369 Supplemental referencing techniques in borehole surveying |
| 04/15/2004 | US20040069942 Methods and apparatus for determining chemical composition of reservoir fluids |
| 04/15/2004 | US20040069539 Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations |
| 04/15/2004 | US20040069535 Method for generating pressure fluctuations in a flowing fluid |
| 04/15/2004 | US20040069530 Pressure pulse generator |
| 04/15/2004 | US20040069488 Apparatuses and methods for deploying logging tools and signalling in boreholes |
| 04/15/2004 | US20040069487 System and method for installation and use of devices in microboreholes |
| 04/15/2004 | CA2499485A1 Battery conservation for downhole telemetry |
| 04/14/2004 | EP1224710B1 Electromagnetic antenna extension assembly and method |
| 04/14/2004 | CN2611602Y High temp directly reading downhole tester for thick oil well |
| 04/14/2004 | CN2611582Y Steam injection detecting wellhead BOP |
| 04/13/2004 | US6720764 Magnetic sensor system useful for detecting tool joints in a downhold tubing string |
| 04/13/2004 | US6719069 Underground boring machine employing navigation sensor and adjustable steering |
| 04/13/2004 | US6719068 Probing device with microwave transmission |
| 04/13/2004 | CA2248798C High pressure tree cap |
| 04/13/2004 | CA2082832C Stuffing box leak detector |
| 04/08/2004 | WO2004029411A1 Sensor isolation system for use in a subterranean environment |
| 04/08/2004 | WO2004001189A3 Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool |
| 04/08/2004 | WO2002075164B1 Flexible joint for well logging instruments |
| 04/08/2004 | US20040065477 Well control using pressure while drilling measurements |
| 04/08/2004 | US20040065446 Expander tool for downhole use |
| 04/08/2004 | US20040065444 Pulsed deployment of a cable through a conduit located in a well |
| 04/08/2004 | US20040065439 Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/08/2004 | US20040065438 Borehole conductivity profiler |
| 04/08/2004 | US20040065437 In-well seismic sensor casing coupling using natural forces in wells |
| 04/08/2004 | US20040065436 System and method for monitoring a packer in a well |
| 04/08/2004 | CA2693270A1 Ruggedized multi-layer printed circuit board based downhole antenna |
| 04/07/2004 | EP1404941A1 Well drilling bit |
| 04/06/2004 | US6717501 Downhole data transmission system |
| 04/06/2004 | US6717410 Bore location system |
| 04/06/2004 | US6715550 Controllable gas-lift well and valve |
| 04/06/2004 | CA2444427A1 In-well seismic sensor casing coupling using natural forces in wells |
| 04/06/2004 | CA2177148C Transducer arrangement |
| 04/06/2004 | CA2129459C Load cells for sensing weight and torque on a drill bit while drilling a well bore |
| 04/01/2004 | WO2004028064A2 Electric submersible oil well pump communications |
| 04/01/2004 | WO2004027214A1 Pitch sensing in drilling machines |
| 04/01/2004 | WO2004027198A2 Remote intervention logic valving method and apparatus |
| 04/01/2004 | WO2004003342A3 Fiber optic amplifier for oilfield applications |
| 04/01/2004 | US20040064258 Method, apparatus and computer program product for creating ream section from memory data based on real-time reaming |
| 04/01/2004 | US20040060738 Method for determining sweep efficiency for removing cuttings from a borehole |
| 04/01/2004 | US20040060710 Internal pressure indicator and locking mechanism for a downhole tool |
| 04/01/2004 | US20040060708 Replaceable antennas for subsurface monitoring apparatus |
| 04/01/2004 | US20040060703 Controlled downhole chemical injection |
| 04/01/2004 | US20040060697 Smart cementing systems |
| 04/01/2004 | US20040060696 System and method for monitoring packer conditions |
| 03/31/2004 | EP1403465A1 Formation fracturing real-time monitoring |
| 03/31/2004 | EP1402601A2 Conductor system |
| 03/31/2004 | EP1402144A1 A wellbore directional steering tool |
| 03/31/2004 | CN1486394A Measuring the in situ static formation temperature |
| 03/30/2004 | US6714870 Method of and apparatus for determining the path of a well bore under drilling conditions |
| 03/30/2004 | US6714138 Method and apparatus for transmitting information to the surface from a drill string down hole in a well |
| 03/30/2004 | US6714014 Apparatus and method for wellbore resistivity imaging using capacitive coupling |
| 03/30/2004 | US6712160 Leadless sub assembly for downhole detection system |
| 03/30/2004 | US6712159 Lockable motor drive |
| 03/30/2004 | US6712141 Method and apparatus for deployment, mounting and coupling of downhole geophones |
| 03/30/2004 | US6712138 Self-calibrated ultrasonic method of in-situ measurement of borehole fluid acoustic properties |
| 03/30/2004 | US6711947 Conductive fluid logging sensor and method |
| 03/30/2004 | CA2230691C An improved electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores |