| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/03/2002 | US20020000317 Communicating with devices positioned outside a liner in a wellbore |
| 01/03/2002 | US20020000316 Method and apparatus for the optimal predistortion of an electromagnetic signal in a downhole communication system |
| 01/02/2002 | EP1167687A2 Apparatus and methods for acoustic signaling in subterranean wells |
| 01/02/2002 | EP1166476A1 Method and apparatus for data communication with an underground instrument package |
| 01/02/2002 | EP1165929A1 Method and apparatus for directional boring |
| 01/02/2002 | CN2469179Y Electronic single point integral type inclinometer |
| 01/02/2002 | CN2469172Y Blow-out preventer for borehole log |
| 01/01/2002 | US6334486 Downhole flow control devices |
| 01/01/2002 | US6334485 Deviated borehole drilling assembly |
| 01/01/2002 | CA2134190C Method of correcting for axial error components in magnetometer readings during wellbore survey operations |
| 12/30/2001 | CA2357065A1 The universal bottom hole orienting sub (ubho) and fishing tool and techniques for retrievable probe type measuring while drilling tools (mwd) in oil and gas wells |
| 12/27/2001 | WO2001098632A1 Inductively coupled method and apparatus of communicating with wellbore equipment |
| 12/27/2001 | WO2001098629A1 Method and apparatus for communicating with downhole devices in a wellbore |
| 12/27/2001 | WO2001098618A2 Burst qam downhole telemetry system |
| 12/27/2001 | US20010054969 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 12/27/2001 | US20010054514 Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations |
| 12/27/2001 | US20010054505 Downhole flow control devices |
| 12/27/2001 | US20010054504 Downhole flow control devices |
| 12/25/2001 | US6333700 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 12/25/2001 | US6333699 Method and apparatus for determining position in a pipe |
| 12/25/2001 | US6332498 Deviated borehole drilling assembly |
| 12/25/2001 | CA2020960C Method of monitoring the drilling of a borehole |
| 12/20/2001 | US20010052774 Method and apparatus for monitoring the advance of seawater into fresh water aquifers near coastal cities |
| 12/20/2001 | US20010052704 Turbogenerator power control system |
| 12/20/2001 | US20010052427 Three dimensional steerable system |
| 12/20/2001 | US20010052426 Boring tool control using remote locator |
| 12/20/2001 | US20010052414 Scale prediction probe |
| 12/19/2001 | EP1163539A1 Directional resistivity measurements for azimuthal proximity detection of bed boundaries |
| 12/19/2001 | EP1163419A1 Control method for use with a steerable drilling system |
| 12/18/2001 | US6330914 Method and apparatus for tracking hydraulic fractures in unconsolidated and weakly cemented soils and sediments |
| 12/13/2001 | WO2001095517A2 Far-end cross-talk cancellation for data transmission on multiple propagation modes |
| 12/13/2001 | WO2001094750A1 Method and apparatus for downhole fluid pressure signal generation and transmission |
| 12/13/2001 | WO2001094745A1 Downhole window finder and method of using the same |
| 12/13/2001 | WO2001031298A3 Multiphase flow measurement system |
| 12/13/2001 | US20010050559 Resistivity and dielectric constant well core measurement system for measurement while drilling and laboratory |
| 12/12/2001 | EP1161615A1 Fluid controlled adjustable down-hole tool |
| 12/11/2001 | US6328119 Adjustable gauge downhole drilling assembly |
| 12/11/2001 | US6328109 Downhole valve |
| 12/06/2001 | WO2001092686A1 Webserver-based well instrumentation, logging, monitoring and control |
| 12/06/2001 | WO2001092685A1 Tracer release method for monitoring fluid flow in a well |
| 12/06/2001 | WO2001092675A2 Method and system for performing operations and for improving production in wells |
| 12/06/2001 | WO2001021927B1 Real-time control system and method for controlling an underground boring machine |
| 12/06/2001 | US20010049049 Annular pack |
| 12/06/2001 | US20010047887 Drill head for directional boring |
| 12/06/2001 | US20010047865 Method of packing extended reach horizontal wells |
| 12/05/2001 | EP1159510A2 Wellbore primary barrier and related systems |
| 12/05/2001 | EP1159506A1 Steerable modular drilling assembly |
| 12/04/2001 | US6325161 Method and apparatus for installing electronic equipment below soft earth surface layer |
| 12/04/2001 | US6325142 Turbogenerator power control system |
| 12/04/2001 | US6324904 Miniature pump-through sensor modules |
| 12/04/2001 | CA2152422C Data transmission system |
| 11/30/2001 | CA2335192A1 Improvements in downhole tools |
| 11/29/2001 | WO2001090532A1 Hydraulically operated fluid metering apparatus for use in a subterranean well |
| 11/29/2001 | WO2001073423A8 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 11/29/2001 | US20010045280 Field development system and associated methods |
| 11/28/2001 | EP1158138A2 Downhole signal communication and measurement through a metal tubular |
| 11/27/2001 | US6321842 Flow control in a wellbore |
| 11/27/2001 | US6321839 Method of and probe for subsurface exploration |
| 11/27/2001 | US6321838 Apparatus and methods for acoustic signaling in subterranean wells |
| 11/27/2001 | US6321595 Characterization of organic contaminants and assessment of remediation performance in subsurface formations |
| 11/27/2001 | US6321456 Method of surveying a bore hole |
| 11/22/2001 | WO2001089014A1 Fuel cell for downhole and subsea power systems |
| 11/22/2001 | WO2001088336A1 Well reference apparatus and method |
| 11/22/2001 | US20010043509 Method and apparatus for improved communication in a wellbore utilizing acoustic signals |
| 11/22/2001 | US20010043146 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 11/22/2001 | US20010042643 Steerable modular drilling assembly |
| 11/22/2001 | US20010042621 Method and apparatus for multilateral well entry |
| 11/22/2001 | US20010042617 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 11/22/2001 | CA2475427A1 Downhole signal communication and measurement through a metal tubular |
| 11/21/2001 | CN2460726Y Test protection device for electronic pressure gage |
| 11/20/2001 | USRE37450 Directional multi-blade boring head |
| 11/20/2001 | US6320820 High data rate acoustic telemetry system |
| 11/20/2001 | US6318463 Slickline fluid indentification tool and method of use |
| 11/20/2001 | US6318457 Multilateral well and electrical transmission system |
| 11/20/2001 | US6318156 Multiphase flow measurement system |
| 11/20/2001 | CA2080483C Method for automatically monitoring the vibrational condition of a drill string |
| 11/17/2001 | CA2347933A1 Apparatus and methods for acoustic signaling in subterranean wells |
| 11/15/2001 | WO2001086325A1 Digital signal receiver for measurement while drilling system having noise cancellation |
| 11/15/2001 | WO2001086117A1 Method and device for measuring physical parameters in a production shaft of a deposit of underground fluid storage reservoir |
| 11/15/2001 | WO2001086109A1 Drill bit mounting for a downhole drilling machine |
| 11/15/2001 | WO2001011189A3 Apparatus for optimizing production of multi-phase fluid |
| 11/15/2001 | US20010041963 Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal |
| 11/15/2001 | US20010039840 Method of determining fluid inflow rates |
| 11/14/2001 | EP1154286A1 Method and apparatus for detecting buried metallic objects |
| 11/14/2001 | EP1153199A1 Method and apparatus for protecting a sensor in a drill collar |
| 11/14/2001 | EP1153196A1 Casing mounted sensors |
| 11/14/2001 | EP1153194A1 Automated bore planning method and apparatus for horizontal directional drilling |
| 11/13/2001 | US6315062 Horizontal directional drilling machine employing inertial navigation control system and method |
| 11/13/2001 | US6315043 Downhole anchoring tools conveyed by non-rigid carriers |
| 11/13/2001 | CA2033062C Moling system |
| 11/08/2001 | WO2001083948A1 Logging sondes for use in boreholes |
| 11/08/2001 | WO2001083938A1 Compression set packer |
| 11/08/2001 | WO2001083933A1 Smart-ultrasonic/sonic driller/corer |
| 11/07/2001 | CN1320759A Automatic digital well-logging method |
| 11/07/2001 | CN1074501C Supersonic pulse reflecting method to measure depth of perforation |
| 11/06/2001 | US6311777 Well logging tool |
| 11/01/2001 | WO2001081914A1 Reservoir monitoring |
| 11/01/2001 | WO2001081724A1 Treatment well tiltmeter system |
| 11/01/2001 | WO2001081714A1 Method and apparatus for forming lateral drains in wellbores |
| 11/01/2001 | WO2001081707A1 Apparatus and method of oscillating a drill string |