| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/21/2013 | CA2848394A1 Energy radiation generator with uni-polar voltage ladder |
| 03/21/2013 | CA2848387A1 Energy radiation generator with bi-polar voltage ladder |
| 03/21/2013 | CA2848187A1 Connection method of replaceable sensors for resistivity arrays |
| 03/20/2013 | EP2570586A1 Gravel Pack and Sand Disposal Device |
| 03/20/2013 | EP2569655A2 Method and apparatus for detecting fluid flow modulation telemetry signals transmitted from and instrument in a wellbore |
| 03/20/2013 | EP2569605A1 Multiphase flowmeter with batch separation |
| 03/20/2013 | EP2569512A2 Transmission system for communication between downhole elements |
| 03/20/2013 | EP2569511A1 Passive monitoring system for a liquid flow |
| 03/20/2013 | EP2569507A2 Subterranean flow barriers containing tracers |
| 03/20/2013 | CN202815813U Device used for updating downhole instrument circuit board onboard central processing unit (CPU) program |
| 03/20/2013 | CN202810840U Natural gamma magnetic-positioning combination logging instrument |
| 03/20/2013 | CN202810839U Storage-typed through drilling tool acoustic logging instrument |
| 03/20/2013 | CN202810838U Signal transmitting device of electromagnetic wave resistivity logging instrument |
| 03/20/2013 | CN202810837U Downhole wireless communication device |
| 03/20/2013 | CN202810836U Gas extraction hole tightness inspection device |
| 03/20/2013 | CN202810835U Packing physical simulation experiment device in hydraulic jet fracturing layer |
| 03/20/2013 | CN202810834U Downhole hydraulic locator |
| 03/20/2013 | CN202810833U Large-diameter tool sensing device for snubbing |
| 03/20/2013 | CN202810832U Multilayer static pressure measuring device |
| 03/20/2013 | CN202810831U Intelligent liquid level detection device |
| 03/20/2013 | CN202810830U Drilling angle measuring system used in coal mine |
| 03/20/2013 | CN202810829U Downhole electronic detacher |
| 03/20/2013 | CN202810828U Oil well bridging plug testing apparatus |
| 03/20/2013 | CN202810827U Braided river island sand body oil displacement experimental device |
| 03/20/2013 | CN202810826U Movable wellhead positioning cover |
| 03/20/2013 | CN202810825U Single oil well measuring device |
| 03/20/2013 | CN202810824U Lead mold detecting tool |
| 03/20/2013 | CN202810820U Oil gas metering separation device |
| 03/20/2013 | CN202810761U Christmas tree water pressure monitoring system |
| 03/20/2013 | CN202810757U Standard wellhead flow path device for heavy oil thermal recovery rod-pumped well |
| 03/20/2013 | CN202810695U Centralizer |
| 03/20/2013 | CN202810652U Horizontal drill orientation system for deep hole drilling carriage |
| 03/20/2013 | CN102979520A Horizontal hole ground stress measurement device based on BWSRM (Borehole Wall Stress Relief Method) principle |
| 03/20/2013 | CN102979515A Storage logging system |
| 03/20/2013 | CN102979514A Pressure bearing electronic warehouse for acoustic logging instrument |
| 03/20/2013 | CN102979513A Signal transmitting device of drilling instrument |
| 03/20/2013 | CN102979512A Black box analyzing method and device for acquiring transmission characteristic of logging cable |
| 03/20/2013 | CN102979511A Small opening pattern plate used for observing fluid flow in porous medium |
| 03/20/2013 | CN102979510A Coal seam water injection displacement gas effect simulated experiment system |
| 03/20/2013 | CN102979509A Temperature pressure profile testing instrument and temperature pressure profile testing device |
| 03/20/2013 | CN102979508A Method for accurately measuring depth in through bit logging |
| 03/20/2013 | CN102979507A Wall penetration perforation positioning device |
| 03/20/2013 | CN102979506A Measuring device and measuring method of underground engineering construction drilling attitude combination |
| 03/20/2013 | CN102979505A Well cementation cement sheath performance simulation experiment device and experiment method |
| 03/20/2013 | CN102979504A Device for simulating oil-gas-water three-phase fluid variable mass flowing in complex structural well shaft |
| 03/20/2013 | CN102979503A Slitting test system for preset crack fracturing |
| 03/20/2013 | CN102979502A Universal detection device of logging instrument |
| 03/20/2013 | CN102418513B Method for detecting treatment effect of road goaf |
| 03/20/2013 | CN102141197B Measuring equipment for exploring path direction in pipe |
| 03/20/2013 | CN102022110B Exciting tension assembly test device for pulser |
| 03/20/2013 | CN101892837B Formation factor determining method and oil saturation determining method |
| 03/20/2013 | CN101566060B Pressure detection device used for instruction issue in drilling operation |
| 03/19/2013 | US8400160 Combined propagation and lateral resistivity downhole tool |
| 03/19/2013 | US8398301 Apparatus for determining downhole fluid temperatures |
| 03/19/2013 | US8397810 Wireless tag tracer method |
| 03/19/2013 | US8397809 Technique and apparatus to perform a leak off test in a well |
| 03/19/2013 | US8397808 Bore-hole jet device for formation hydraulic fracturing and horizontal well examination and a method for the operation thereof |
| 03/19/2013 | US8397561 Downhole sensor systems and methods thereof |
| 03/19/2013 | CA2788228A1 Borehole resistivity imager using discrete energy pulsing |
| 03/19/2013 | CA2690142C In situ determination of critical desorption pressures |
| 03/14/2013 | WO2013036896A1 Adaptive inversion for vertical resistivity logs from multiaxial induction measurements |
| 03/14/2013 | WO2013036852A1 Optical casing collar locator systems and methods |
| 03/14/2013 | WO2013036455A1 System and method for downhole electrical transmission |
| 03/14/2013 | WO2013036131A1 Device for monitoring scale in a well installation |
| 03/14/2013 | WO2012174202A3 Systems and methods for placing markers in a formation |
| 03/14/2013 | WO2012150983A3 Detection of static tip resistance of a pile |
| 03/14/2013 | WO2012145637A3 Apparatus and method for tool face control using pressure data |
| 03/14/2013 | WO2012141843A3 High temperature piezoresistive strain gauges made of silicon-on-insulator |
| 03/14/2013 | WO2012125936A3 Downhole rebound hardness measurement while drilling or wireline logging |
| 03/14/2013 | WO2012125274A3 Precision marking of subsurface locations |
| 03/14/2013 | WO2012109663A3 System and apparatus for modeling the behavior of a drilling assembly |
| 03/14/2013 | US20130066558 Method to estimate pore pressure uncertainty form trendline variations |
| 03/14/2013 | US20130062123 Steering head |
| 03/14/2013 | US20130062122 High temperature drilling with lower temperature rated tools |
| 03/14/2013 | US20130062068 Use of Sensors Coated with Elastomer for Subterranean Operations |
| 03/14/2013 | US20130062057 Lithology and Borehole Condition Independent Methods For Locating Tagged Proppant in Induced Subterranean Formation Fractures |
| 03/14/2013 | US20130062055 Assembly and method for multi-zone fracture stimulation of a reservoir using autonomous tubular units |
| 03/14/2013 | US20130062054 Method for determining fracture spacing and well fracturing using the method |
| 03/14/2013 | US20130061668 Interchangeable measurement housings |
| 03/14/2013 | CA2848155A1 Adaptive inversion for vertical resistivity logs from multiaxial induction measurements |
| 03/14/2013 | CA2846856A1 Petroleum well intervention winch system |
| 03/13/2013 | EP2568317A1 Apparatus and method for measuring the acoustic impedance of wellbore fluids |
| 03/13/2013 | EP2568112A1 Test device for oil well pipe threaded joint |
| 03/13/2013 | EP2567068A1 Method and apparatus to adjust weight-on-bit/torque-on-bit sensor bias |
| 03/13/2013 | EP2567067A1 System and method for remote wellbore servicing operations |
| 03/13/2013 | CN202788832U Novel casing pipe pressure obtaining device |
| 03/13/2013 | CN202788829U Microcolumn type focused logging instrument |
| 03/13/2013 | CN202788822U Ground graduating device of drill following electromagnetic wave resistivity logger |
| 03/13/2013 | CN202788821U Portable pressure test recording instrument |
| 03/13/2013 | CN202788820U Automatic digital-display oil-filling machine |
| 03/13/2013 | CN202788819U Signal transmitter calibrating device for logging communication |
| 03/13/2013 | CN202788818U Solar wireless MESH communication device for oil field |
| 03/13/2013 | CN202788817U Near-bit measuring system experimental facility |
| 03/13/2013 | CN202788816U Suction-type downhole solid-liquid isotope releaser |
| 03/13/2013 | CN202788815U Oil and gas invasion monitoring and alarming system |
| 03/13/2013 | CN202788814U Power cable intermediate joint online-monitoring data concentrator |
| 03/13/2013 | CN202788813U Temperature measurement output cable |
| 03/13/2013 | CN202788812U Pneumatic integration coal seam gas pressure test system |
| 03/13/2013 | CN202788811U Integrated active coal-bed gas pressure testing system |
| 03/13/2013 | CN202788810U Pressure testing device of oil-water well operation well head and blowout preventer |