| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 12/11/2008 | CA2689478A1 Apparatus for determining the concentration of a conductive fluid present in a fluid filled borehole |
| 12/10/2008 | EP2000630A1 Downhole 4D pressure measurement apparatus and method for permeability characterization |
| 12/10/2008 | EP1999973A2 Pressure communication assembly external to casing with connectivity to pressure source |
| 12/10/2008 | EP1999342A2 Drill bit assembly with a logging device |
| 12/10/2008 | CN201162534Y Intelligent monitoring instrument for oil salvage operation |
| 12/10/2008 | CN201162533Y Pipe nipple capable of measuring rotation speed of down-hole drilling tool |
| 12/10/2008 | CN201162511Y Underbalance pressurized logging apparatus |
| 12/10/2008 | CN101319610A Down-hole drilling direction ruler and fast orienting method for hole drilling |
| 12/10/2008 | CN101319609A Underbalanced drilling parameter prediction technique |
| 12/10/2008 | CN100442024C High-temperature-resistant high-pressure-resistant ceramic strain gauge sensor and its package curing method |
| 12/09/2008 | US7463551 Method of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications |
| 12/09/2008 | US7461706 Drilling apparatus with percussive action cutter |
| 12/09/2008 | US7461691 In situ recovery from a hydrocarbon containing formation |
| 12/09/2008 | US7461547 Methods and apparatus of downhole fluid analysis |
| 12/09/2008 | CA2458831C Method and system for determining and controlling position of a valve |
| 12/09/2008 | CA2395098C A system and methods for detecting pressure signals generated by a downhole actuator |
| 12/09/2008 | CA2377895C Power line communication system |
| 12/09/2008 | CA2178988C A venturi flow meter for measurement in a fluid flow passage |
| 12/08/2008 | CA2632976A1 Downhole 4d pressure measurement apparatus and method for permeability characterization |
| 12/04/2008 | WO2008147511A1 Simultaneous drilling and open hole wireline logging for drilling rigs |
| 12/04/2008 | WO2008147217A2 Control system |
| 12/04/2008 | WO2008145950A1 Orientation sensor for downhole tool |
| 12/04/2008 | WO2008144920A1 Method and apparatus for three dimensional geosteering |
| 12/04/2008 | WO2008107855A3 Downhole load cell |
| 12/04/2008 | WO2008085642A3 Device and method for measuring a property in a downhole apparatus |
| 12/04/2008 | WO2008070643A3 Overpressure protection device |
| 12/04/2008 | WO2008069677A3 Power supply system for downhole network |
| 12/04/2008 | WO2007140134A3 System, method, and apparatus for downhole submersible pump having fiber optic communications |
| 12/04/2008 | US20080300791 Azimuthal Measurement-While-Drilling (MWD) Tool |
| 12/04/2008 | US20080296064 Method and apparatus for three dimensional geosteering |
| 12/04/2008 | US20080296025 Control system |
| 12/04/2008 | US20080296017 Methods and Apparatus to Sample Heavy Oil from a Subteranean Formation |
| 12/04/2008 | US20080296016 Force Balanced Rotating Pressure Control Device |
| 12/04/2008 | US20080295589 Automated-Precision Pressure Meter |
| 12/04/2008 | CA2688329A1 Orientation sensor for downhole tool |
| 12/04/2008 | CA2686452A1 Method of measuring gas flow |
| 12/03/2008 | EP1998002A2 Position sensor for determining operational condition of downhole tool |
| 12/03/2008 | EP1996794A1 Acoustic telemetry |
| 12/03/2008 | EP1996793A1 Communication means for communication with and remote activation of downhole tools and devices used in association with wells for production of hydrocarbons |
| 12/03/2008 | EP1996792A2 Method and apparatus for hydraulic fracturing and monitoring |
| 12/03/2008 | CN201159082Y Borehole clinometer probe |
| 12/03/2008 | CN201159081Y Combustion driving three-dimensional physical analog measurement controller |
| 12/03/2008 | CN201159080Y Safety information data collection device of blowout preventer |
| 12/03/2008 | CN201159068Y Effluent oil recovery conveying device |
| 12/03/2008 | CN201159066Y Induced flow test valve for high pressure oil gas well |
| 12/03/2008 | CN201159059Y Hanging tongs for petroleum well drilling and repairing with data-logging equipment |
| 12/03/2008 | CN101315029A Accurate synchronous method for receiving and transmitting well logging sound wave signal |
| 12/03/2008 | CN101315028A Non-linear temperature compensation method for digital sound wave variable density sonic system |
| 12/03/2008 | CN101315027A Apparatus for detecting transmitted signal of electromagnetic wave logging instrument |
| 12/03/2008 | CN101315024A Jackrod one-way pump injection type sealing/sealing releasing device for hole-inside base |
| 12/03/2008 | CN100439650C Deep well detection optical-fiber transmission system |
| 12/03/2008 | CN100439649C Full automatic weighing type gas liquid diphase oil well metering device |
| 12/02/2008 | US7460438 Downhole data communication |
| 12/02/2008 | US7460436 Apparatus and method for hydraulic fracture imaging by joint inversion of deformation and seismicity |
| 12/02/2008 | US7460435 Acoustic transducers for tubulars |
| 12/02/2008 | US7458421 Methods and systems for robust and accurate determination of wireline depth in a borehole |
| 12/02/2008 | US7458420 Downhole measurement system and method |
| 12/02/2008 | US7458273 Fiber optic differential pressure sensor |
| 12/02/2008 | US7458258 Methods and apparatus for oil composition determination |
| 12/02/2008 | US7458257 Downhole measurement of formation characteristics while drilling |
| 12/02/2008 | CA2457324C Motion sensor for noise cancellation in borehole electromagnetic telemetry system |
| 12/02/2008 | CA2370009C Surveying of boreholes |
| 11/27/2008 | WO2008144712A1 Use of flexible member for borehole diameter measurement |
| 11/27/2008 | WO2008144710A1 System and method for performing a drilling operation in an oilfield |
| 11/27/2008 | WO2008144165A1 Method and apparatus for automated fluid loss measurements of drilling fluids |
| 11/27/2008 | WO2008142585A2 Methods and systems for investigating downhole conditions |
| 11/27/2008 | WO2007149507A3 Rigless well intervention apparatus and method |
| 11/27/2008 | US20080294344 Angular position sensor for a downhole tool |
| 11/27/2008 | US20080294343 Gravity zaimuth measurement at a non-rotting housing |
| 11/27/2008 | US20080291048 Use of flexible member for borehole diameter measurement |
| 11/27/2008 | US20080290873 Subsurface Electromagnetic Measurements using Cross-Magnetic Dipoles |
| 11/27/2008 | US20080289875 Method and System for the Design of an Oil Well |
| 11/27/2008 | US20080289818 open hole logging for drilling rigs |
| 11/27/2008 | US20080289817 Method and apparatus for re-entering an abandoned well |
| 11/27/2008 | US20080289408 Methods and systems for investigating downhole conditions |
| 11/27/2008 | CA2686475A1 Methods and systems for investigating downhole conditions |
| 11/27/2008 | CA2685290A1 System and method for performing a drilling operation in an oilfield |
| 11/26/2008 | EP1995406A1 Angular position sensor for a downhole tool |
| 11/26/2008 | EP1994488A2 Method for quantifying reservoir connectivity using fluid travel times |
| 11/26/2008 | CN201155326Y Hydrocarbon monitoring cable possessing absorption layer |
| 11/26/2008 | CN201155325Y Rotating inertia body for optical fibre gyroscope continuous gradient meter |
| 11/26/2008 | CN101313128A Protective barriers for small devices |
| 11/26/2008 | CN101313127A Method for monitoring fluid properties |
| 11/26/2008 | CN101311493A Active cable for wellbore heating and distributed temperature sensing |
| 11/26/2008 | CN100437040C Non-packer silo vortex shedding flowmeter |
| 11/25/2008 | US7455125 Drilling tool equipped with improved cutting element layout to reduce cutter damage through formation changes, methods of design and operation thereof |
| 11/25/2008 | US7455108 Radio frequency tags for turbulent flows |
| 11/25/2008 | US7455107 Well jet device for logging horizontal wells and the operating method thereof |
| 11/25/2008 | CA2474413C Reliable outdoor instrument cooling system |
| 11/25/2008 | CA2455101C Fiber optic based method and system for determining and controlling position of a sliding sleeve valve |
| 11/25/2008 | CA2439026C Optical fiber conveyance, telemetry, and/or actuation |
| 11/25/2008 | CA2434770C Apparatus for recording a physical impression of an object down an oil well |
| 11/25/2008 | CA2384811C Method of drilling a wellbore with disengageable couplers |
| 11/25/2008 | CA2317181C Borehole resistivity measurement apparatus |
| 11/21/2008 | CA2694104A1 Use of flexible member for borehole diameter measurement |
| 11/20/2008 | WO2008141331A1 Combined electro-magnetic acoustic transducer |
| 11/20/2008 | WO2008139070A1 Probe for analysing a rod or pipe assembly |
| 11/20/2008 | WO2008086464A8 System and method for determining the rotational alignment of drill string elements |
| 11/20/2008 | US20080285386 Training For Directional Detection |
| 11/20/2008 | US20080283738 Device for Examining Rotor Drilled Holes |