| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 02/12/2009 | US20090038850 Advanced Steering Tool System, Method and Apparatus |
| 02/12/2009 | US20090038849 Communication Connections for Wired Drill Pipe Joints |
| 02/12/2009 | US20090038848 Peizoelectric generator particularly for use with wellbore drilling equipment |
| 02/12/2009 | US20090038794 High-temperature downhole devices |
| 02/12/2009 | US20090038793 Subsurface formation monitoring system and method |
| 02/12/2009 | US20090038392 System and method for correcting errors in depth for measurments made while drilling |
| 02/12/2009 | US20090038391 Through-mill wellbore optical inspection and remediation apparatus and methodology |
| 02/12/2009 | CA2695593A1 System and method for stress field based wellbore steering |
| 02/12/2009 | CA2692929A1 Method and apparatus for downlink communication using dynamic threshold values for detecting transmitted signals |
| 02/11/2009 | CN201193523Y Liquid metering device for oil well |
| 02/11/2009 | CN201193522Y Rotary type slurry pulser |
| 02/11/2009 | CN201193521Y Simulator for measurprobe sensor signal while drilling |
| 02/11/2009 | CN201193520Y Double-measure press-guiding device under well of electric pump |
| 02/11/2009 | CN201193519Y Vehicle-mounted type oil well three phase metering device |
| 02/11/2009 | CN201193518Y Data recording instrument for oil well lowering in operation |
| 02/11/2009 | CN201193509Y Multifunction intelligent collision-proof device |
| 02/11/2009 | CN101365858A System and method for reducing the borehole gap for downhole formation testing sensors |
| 02/11/2009 | CN101363314A Ultrasound phased array cased well and front sounding integration detecting method |
| 02/11/2009 | CN101363307A Method and apparatus for directional boring under mixed conditions |
| 02/10/2009 | US7490028 Method, apparatus and system for pore pressure prediction in presence of dipping formations |
| 02/10/2009 | US7489591 Drilling fluid pressure pulse detection using a differential transducer |
| 02/10/2009 | US7487830 Method and apparatus to facilitate wet or dry control line connection for the downhole environment |
| 02/10/2009 | CA2584671C System and method for downhole telemetry |
| 02/10/2009 | CA2544829C Borehole imaging system for conductive and resistive drilling fluids |
| 02/10/2009 | CA2424134C Method for estimating the position of a drill |
| 02/10/2009 | CA2398545C Production optimization methodology for multilayer commingled reservoirs using commingled reservoir production performance data and production logging information |
| 02/09/2009 | CA2635101A1 A subsurface formation monitoring system and method |
| 02/05/2009 | WO2009018462A1 Valuing future information under uncertainty |
| 02/05/2009 | WO2009017900A2 Apparatus and method for wirelessly communicating data between a well and the surface |
| 02/05/2009 | WO2009017899A1 Optical fiber landing indicator with distributed temperature sensor calibaration |
| 02/05/2009 | WO2009017728A1 System and method for sensing pressure using an inductive element |
| 02/05/2009 | WO2009016386A1 Methods and systems for evaluating and treating previously-fractured subterranean formations |
| 02/05/2009 | WO2008141331A9 Combined electro-magnetic acoustic transducer |
| 02/05/2009 | US20090037594 Method and system for improving computer network security |
| 02/05/2009 | US20090037112 Methods and systems for evaluating and treating previously-fractured subterranean formations |
| 02/05/2009 | US20090037110 Wellbore surveying |
| 02/05/2009 | US20090034368 Apparatus and method for communicating data between a well and the surface using pressure pulses |
| 02/05/2009 | US20090032303 Apparatus and method for wirelessly communicating data between a well and the surface |
| 02/05/2009 | US20090032302 Tool face sensor method |
| 02/05/2009 | US20090031796 System and method for sensing pressure using an inductive element |
| 02/05/2009 | CA2693629A1 System and method for sensing pressure using an inductive element |
| 02/05/2009 | CA2693486A1 Valuing future information under uncertainty |
| 02/05/2009 | CA2693485A1 Apparatus and method for communication data between well and the surface using pressure pulses |
| 02/05/2009 | CA2693335A1 Apparatus and method for wirelessly communicating data between a well and the surface |
| 02/04/2009 | CN201190565Y High resolution digitisation acoustic logging device |
| 02/04/2009 | CN201190564Y Multi-point measuring instrument for auto timing and selecting points |
| 02/04/2009 | CN201190563Y Rotary metering device |
| 02/04/2009 | CN201190562Y Oil well sleeve pipe localizer |
| 02/04/2009 | CN201190561Y Gas well localizer |
| 02/04/2009 | CN101358525A Oil well with rod pressure test operation method |
| 02/04/2009 | CN101358524A Single-driving and double-receiving four-arm well diameter, microsphere, microelectrode eccentering device |
| 02/04/2009 | CN101358523A Differential pressure type flow densimeter underground |
| 02/04/2009 | CN101358517A Telemetry subsystem to communicate with plural downhole modules |
| 02/04/2009 | CN100458101C System and method for detecting the characters of underground stratum passed though by pitshift |
| 02/04/2009 | CN100458100C Method for measuring downhole pressure in the course of drilling operation and its equipment |
| 02/03/2009 | US7484561 Electro thermal in situ energy storage for intermittent energy sources to recover fuel from hydro carbonaceous earth formations |
| 01/29/2009 | WO2009014882A2 Method and apparatus for optimizing magnetic signals and detecting casing and resistivity |
| 01/29/2009 | WO2009014838A1 Anti-collision method for drilling wells |
| 01/29/2009 | WO2009012591A1 Drill bit tracking apparatus and method |
| 01/29/2009 | WO2008064034A4 Cement bond analysis |
| 01/29/2009 | WO2007117787A3 Enhanced hydrocarbon recovery by convective heating of oil sand formations |
| 01/29/2009 | US20090030615 Method and apparatus for optimizing magnetic signals and detecting casing and resistivity |
| 01/29/2009 | US20090029737 Electronics card communication |
| 01/29/2009 | US20090027227 Remote area Sensor System |
| 01/29/2009 | US20090025983 Methods and Apparatus to Apply Axial Force to a Packer in a Downhole Tool |
| 01/29/2009 | US20090025924 Sensor and Insulation Layer Structure for Well Logging Instruments |
| 01/29/2009 | US20090025470 Tracer method and apparatus |
| 01/29/2009 | CA2806516A1 Drill bit tracking apparatus and method |
| 01/29/2009 | CA2694225A1 Drill bit tracking apparatus and method |
| 01/29/2009 | CA2693917A1 Method and apparatus for optimizing magnetic signals and detecting casing and resistivity |
| 01/29/2009 | CA2693798A1 Anti-collision method for drilling wells |
| 01/28/2009 | EP2019525A2 Electronics card communication |
| 01/28/2009 | CN201187295Y Vertical drill pulse generator short node |
| 01/28/2009 | CN201187294Y Electromagnetic valve for oil field wireless well logging |
| 01/28/2009 | CN201187293Y Non-cable multi-parameter combined drill leak detection instrument |
| 01/28/2009 | CN201187292Y Multifunctional electrohydraulic integrated apparatus |
| 01/28/2009 | CN201187291Y Transposition power mechanism of ring pressure control test valve |
| 01/28/2009 | CN101353962A Apparatus and methods to perform operations in a wellbore using downhole tools having movable sections |
| 01/28/2009 | CN101353960A Exploration well oil test continuous metering apparatus |
| 01/28/2009 | CN101353950A On-site connection joint for downhole tool and downhole tool |
| 01/27/2009 | US7481281 Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components |
| 01/27/2009 | US7481280 Method and apparatus for conducting earth borehole operations using coiled casing |
| 01/27/2009 | CA2541516C Drill string system for performing measurement while drilling and logging while drilling operations |
| 01/27/2009 | CA2530198C Borehole communication and measurement system |
| 01/27/2009 | CA2509928C Apparatus and method to detect actuation of a flow control device |
| 01/27/2009 | CA2508941C Apparatus and methods for measuring mud slowness in a borehole |
| 01/27/2009 | CA2494144C Measurement-while-drilling assembly using real-time toolface oriented measurements |
| 01/22/2009 | WO2009012218A2 System and method for an ac powered downhole gauge |
| 01/22/2009 | WO2009012139A2 Estimation of multichannel mud characteristics |
| 01/22/2009 | WO2009011610A1 Well jet device |
| 01/22/2009 | WO2009009901A1 In situ determination of critical desorption pressures |
| 01/22/2009 | WO2008131210A3 System and method for water breakthrough detection and intervention in a production well |
| 01/22/2009 | US20090020333 Measuring the weight on a drill bit during drilling operations using coherent radiation |
| 01/22/2009 | US20090020283 2D Well Testing with Smart Plug Sensor |
| 01/22/2009 | CA2693718A1 Estimation of multichannel mud characteristics |
| 01/22/2009 | CA2692663A1 Well jet device |
| 01/22/2009 | CA2690142A1 In situ determination of critical desorption pressures |
| 01/21/2009 | EP1819900B1 Sonde attachment means |
| 01/21/2009 | EP1381750B1 Drilling system with expandable sleeve |
| 01/21/2009 | CN201184196Y Petroleum engineering drilling fluid pump rushing wireless sensing device |