| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/05/2011 | WO2011017289A3 Apparatus and method for quality assessment of downhole data |
| 05/05/2011 | WO2011014761A3 Telemetry coding and surface detection for a mud pulser |
| 05/05/2011 | WO2011014538A3 Gamma ray detectors having azimuthal sensitivity |
| 05/05/2011 | WO2011014389A3 Exploitation of sea floor rig structures to enhance measurement while drilling telemetry data |
| 05/05/2011 | WO2011011399A3 Slip ring apparatus for a rotary steerable tool |
| 05/05/2011 | WO2011010101A3 Downhole apparatus and method |
| 05/05/2011 | WO2010136773A3 Well monitoring by means of distributed sensing means |
| 05/05/2011 | WO2010116228A3 In-situ evaluation of reservoir sanding and fines migration and related completion, lift and surface facilities design |
| 05/05/2011 | WO2010025150A3 Sand control screen assembly and method for use of same |
| 05/05/2011 | WO2009113877A3 Device for pressure testing of pipes |
| 05/05/2011 | US20110106452 Determination and Control of Wellbore Fluid Level, Output Flow, and Desired Pump Operating Speed, Using a Control System for a Centrifugal Pump Disposed Within the Wellbore |
| 05/05/2011 | US20110101985 Tracking the positional relationship between a boring tool and one or more buried lines using a composite magnetic signal |
| 05/05/2011 | US20110100712 Method for determining wellbore position using seismic sources and seismic receivers |
| 05/05/2011 | US20110100642 Instrumented tubing and method for determining a contribution to fluid production |
| 05/05/2011 | US20110100632 Method for monitoring flood front movement during flooding of subsurface formations |
| 05/05/2011 | US20110100623 High efficiency fluid pumping apparatus and method |
| 05/05/2011 | US20110100113 Conductivity Cell Piston Extractor and Method |
| 05/05/2011 | US20110100112 Piezo-based downhole flow meter |
| 05/05/2011 | US20110100111 Apparatus and Method for Fluid Flow Measurement with Sensor Shielding |
| 05/05/2011 | DE202011003051U1 Gewichtselement zum Einbringen von Rohren in Bohrlöcher Weight element for inserting tubes into wells |
| 05/05/2011 | CA2779629A1 Bubble logging tool |
| 05/05/2011 | CA2779172A1 Azimuth initialization and calibration of wellbore surveying gyroscopic and inertial instruments by means of an external navigation system |
| 05/05/2011 | CA2774292A1 Magnetic ranging system for controlling a drilling process |
| 05/05/2011 | CA2773275A1 Scanning tool |
| 05/05/2011 | CA2773272A1 Positioning tool |
| 05/04/2011 | EP2317073A1 An instrumented tubing and method for determining a contribution to fluid production |
| 05/04/2011 | EP2317072A1 Bubble logging tool |
| 05/04/2011 | EP2317071A1 Positioning tool |
| 05/04/2011 | EP2317070A1 Downhole system |
| 05/04/2011 | EP2317069A1 Magnetic ranging system for controlling a drilling process |
| 05/04/2011 | EP2317068A1 Scanning tool |
| 05/04/2011 | EP2315914A2 Methods and apparatus to form a well |
| 05/04/2011 | EP2315913A1 Well flaw detection system (embodiments) |
| 05/04/2011 | CN201818304U Wireless logging while drilling pulse generator |
| 05/04/2011 | CN201818303U Module type sound wave logging instrument scale device |
| 05/04/2011 | CN201818302U Underground information uploading device in drilling process |
| 05/04/2011 | CN201818301U Logging ground or underground signal transmission circuit |
| 05/04/2011 | CN201818300U Integrated depth measuring instrument |
| 05/04/2011 | CN201818299U Oil gauge |
| 05/04/2011 | CN201818298U Gel breaker tester for screen pipe well completion |
| 05/04/2011 | CN201818297U Oil-gas-water three phase automatic metering device |
| 05/04/2011 | CN201818296U Scraper weighing-type gas and liquid two-phase flow meter |
| 05/04/2011 | CN201818257U Wellbore pressure management system |
| 05/04/2011 | CN1777737B Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation. |
| 05/04/2011 | CN102042003A Digital sound wave and variable-density comprehensive logging instrument |
| 05/04/2011 | CN102042002A Acoustic logging method capable of simultaneously acquiring various longitudinal resolutions |
| 05/04/2011 | CN102042001A Digital acoustic wave multilevel underground instrument capable of realizing real-time automatic gain control |
| 05/04/2011 | CN102042000A Multichannel AD (Analog-to-Digital) concurrent conversion acoustic logger |
| 05/04/2011 | CN102041999A Microsphere logging instrument sidewall contact device |
| 05/04/2011 | CN102041998A Pressure transmission structure |
| 05/04/2011 | CN102041997A Rotary drilling rig and depth sounding system |
| 05/04/2011 | CN102041996A Azimuth pup joint probe for petroleum exploration |
| 05/04/2011 | CN102041995A System for monitoring complicated oil deposit flooding conditions |
| 05/04/2011 | CN102041994A Hydrogen sulfide early-warning measuring method |
| 05/04/2011 | CN102041993A Rotating short joint for oil well logging |
| 05/04/2011 | CN102041992A Underground backup emergency escape system of logging instrument |
| 05/04/2011 | CN102041991A Pressure balancing mechanism |
| 05/04/2011 | CN102041990A Sealing structure of rotary bridle |
| 05/04/2011 | CN102041989A Logging ground system power supply and data bus anti-jamming circuit |
| 05/04/2011 | CN102041985A Multi-parameter real-condition monitoring method for well completion of underground perforator |
| 05/04/2011 | CN101050698B Logging unit repair test system and test unit |
| 05/03/2011 | US7937222 Method of determining saturations in a reservoir |
| 05/03/2011 | US7934556 Method and system for treating a subterranean formation using diversion |
| 05/03/2011 | CA2656647C Logging device with down-hole transceiver for operation in extreme temperatures |
| 05/03/2011 | CA2616385C Data communications embedded in threaded connections |
| 05/03/2011 | CA2609922C Measurement while drilling bi-directional pulser operating in a near laminar annular flow channel |
| 05/03/2011 | CA2462466C Systems and methods for controlling flow control devices |
| 05/03/2011 | CA2455581C Downhole calibration system for directional sensors |
| 04/28/2011 | WO2011049912A1 Microresistivity imaging in conductive and nonconductive drilling fluid |
| 04/28/2011 | WO2011049899A1 Microresistivity imaging at multiple depths of investigation |
| 04/28/2011 | WO2011049828A2 Methods for characterization of formations, navigating drill paths, and placing wells in earth boreholes |
| 04/28/2011 | WO2011049691A2 Electrical conduction across interconnected tubulars |
| 04/28/2011 | WO2011049573A1 Em telemetry gap sub |
| 04/28/2011 | WO2011048374A1 Downhole monitoring with distributed optical density, temperature and/or strain sensing |
| 04/28/2011 | WO2011048090A1 System for communicating over a power cable |
| 04/28/2011 | WO2011011610A3 Risk assesment for tools |
| 04/28/2011 | WO2011011512A3 Detector for characterizing a fluid |
| 04/28/2011 | WO2011009022A3 Method and apparatus of heat dissipaters for electronic components in downhole tools |
| 04/28/2011 | WO2011008707A3 Cancellation of vibration noise in deep transient resistivity measurements while drilling |
| 04/28/2011 | WO2011008471A3 Materials for use as structural neutron moderators in well logging tools |
| 04/28/2011 | WO2011006054A3 Apparatus and method for reducing effects of eccentricity in induction tools |
| 04/28/2011 | WO2010141287A4 Wireless transmission system and system for monitoring a drilling rig operation |
| 04/28/2011 | WO2009128990A3 Magnetic ranging whle drilling using an electric dipole source and a magnetic field sensor |
| 04/28/2011 | WO2009056992A3 Reservoir fracture simulation |
| 04/28/2011 | US20110098931 System and method for obtaining and analyzing well data |
| 04/28/2011 | US20110094799 Pressure release encoding system for communicating downhole information through a wellbore to a surface location |
| 04/28/2011 | US20110094752 Control of sub surface safety valves |
| 04/28/2011 | US20110094741 Methods and apparatus for measuring return flow in a well |
| 04/28/2011 | US20110094734 Downhole tool |
| 04/28/2011 | US20110094733 Apparatus and Methods for Pulse Testing a Formation |
| 04/28/2011 | DE102009031364A1 Spacer for pair of pipes, particularly pair of borehole-pipes, has opening with clip formed integrally and elastically, where profile corresponding to pipe diameter is provided at predetermined distance of borehole pipe |
| 04/28/2011 | CA2778434A1 Em telemetry gap sub |
| 04/28/2011 | CA2778086A1 Downhole monitoring with distributed acoustic/vibration, strain and/or density sensing |
| 04/27/2011 | EP2315000A2 Methods and apparatus to determine phase-change pressures |
| 04/27/2011 | EP2314830A1 Tractor communications/control and select fire perforating switch |
| 04/27/2011 | EP2313797A1 Control of sub surface safety valves |
| 04/27/2011 | EP2313796A2 Hydrocarbon determination in presence of electron and chemical ionization |
| 04/27/2011 | EP2313604A1 Method and device for core drilling |
| 04/27/2011 | CN201810305U Positioning and propelling device in three-component seismometer hole |
| 04/27/2011 | CN201810303U Wireless transmission device for directly reading downhole testing data by crossing test valve |