| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/27/2013 | CN202832650U Positive-pressure water discharging device and gas pressure detecting device |
| 03/27/2013 | CN202832520U System and acoustic logger capable of eliminating interference of direct waves during acoustic logging |
| 03/27/2013 | CN202832519U Lower slant hole air bag type water sealing sound wave testing device |
| 03/27/2013 | CN202832518U Measurement-while-drilling continuous wave signal generator |
| 03/27/2013 | CN202832517U Acoustic MWD nipple |
| 03/27/2013 | CN202832516U Oil pumping well wireless transmission device from ground to underground well |
| 03/27/2013 | CN202832515U High-pressure-resisting continuous pipe drilling machine under-pit communication device |
| 03/27/2013 | CN202832514U Well-logging data transmission system |
| 03/27/2013 | CN202832513U Tubular column pressure-testing device |
| 03/27/2013 | CN202832512U Oil-gas migration physical modeling device |
| 03/27/2013 | CN202832511U Locatable direct-reading type dual-flow water amount regulation device |
| 03/27/2013 | CN202832510U Device for visualization of temperature of mineshaft frozen wall |
| 03/27/2013 | CN202832509U Field calibration device of downhole temperature logging cable |
| 03/27/2013 | CN202832508U Pressure measuring supplement core |
| 03/27/2013 | CN202832507U Mine gas-liquid separation pressure measurement device |
| 03/27/2013 | CN202832506U Depression angle measuring system of gas pressure |
| 03/27/2013 | CN202832505U Measuring system of dynamic liquid level of oil well |
| 03/27/2013 | CN202832504U Device of accurate calculation of well depth based on polarized light |
| 03/27/2013 | CN202832503U Combination well logging device |
| 03/27/2013 | CN202832502U Well drilling hole track detector |
| 03/27/2013 | CN202832501U Shock absorption protection holding cylinder |
| 03/27/2013 | CN202832500U Radial damping device of battery pack used for wireless measurement while drilling (MWD) device |
| 03/27/2013 | CN202832499U Rubber guide cone |
| 03/27/2013 | CN202832498U Suspended short section of pulse generator |
| 03/27/2013 | CN202832497U Pressure-holding diagnostic apparatus of pumping unit well system |
| 03/27/2013 | CN202832496U Single-core double-power drive device for ball current collectors |
| 03/27/2013 | CN202832495U Sealing connector body |
| 03/27/2013 | CN202832494U Tester for testing corrosion speed of production tubular column in oil well |
| 03/27/2013 | CN202832493U Well logging steel wire draining device of water injection well |
| 03/27/2013 | CN202832492U Piston balanced type flexible nipple |
| 03/27/2013 | CN202832491U High pressure gas well testing adjustable type inner blowout prevention pipeline |
| 03/27/2013 | CN202832490U Weighing type segregator calibration device |
| 03/27/2013 | CN202832489U Universal rotary joint for logging of oil field |
| 03/27/2013 | CN202832488U Liquid production capacity metering device |
| 03/27/2013 | CN202832487U Gas-liquid two-phase metering device |
| 03/27/2013 | CN202832486U Hanging ring device of underground corrosion monitoring |
| 03/27/2013 | CN202832485U Underground wireless charging mechanical device |
| 03/27/2013 | CN202832484U Well mouth pressure testing device |
| 03/27/2013 | CN202832483U Thick oil solution gas drive encryption mining physical simulation experiment device |
| 03/27/2013 | CN202832482U Drilling parameter mobile telephone monitoring system with voice alarming function |
| 03/27/2013 | CN202832481U Well drilling parameter remote monitoring system based on wireless network |
| 03/27/2013 | CN202832480U Two-dimensional quantitative-squeezing visible physical simulation device for petroleum migration and accumulation |
| 03/27/2013 | CN202832479U Underground ultrasonic roof-and-floor measuring device |
| 03/27/2013 | CN202832478U Tote cart for scale area of induction logger |
| 03/27/2013 | CN202832477U Parallel plane coils used for induction logging and induction logging equipment |
| 03/27/2013 | CN202832476U Underground pressure and weigh sensor system chip |
| 03/27/2013 | CN202832333U Downhole repeated vibratory device for oil gas drilling |
| 03/27/2013 | CN202832279U Integral helical-groove directional drill pipe |
| 03/27/2013 | CN202832272U Sheet type centralizer convenient to replace |
| 03/27/2013 | CN202832253U High-temperature high-pressure transmission logging male connector |
| 03/27/2013 | CN202832252U Transmission well logging butt joint tool capable of being used under high temperature and high pressure |
| 03/27/2013 | CN202832251U Wire transmission device for connecting thread joint |
| 03/27/2013 | CN103003524A Surface detection of failed open-hole packers using tubing with external tracer coatings |
| 03/27/2013 | CN103003523A Detection of tool in pipe |
| 03/27/2013 | CN102996121A Temperature measuring method of shallow holes of primary rock |
| 03/27/2013 | CN102996120A Detection system for communicated rescue well and accident well based on three electrode system |
| 03/27/2013 | CN102996119A Downhole detection unit |
| 03/27/2013 | CN102996118A Sound wave logging instrument with sound insulation function |
| 03/27/2013 | CN102996117A Heat-resistant gas injection multi-parameter logger |
| 03/27/2013 | CN102996116A Dynamic mud cake circulating device and using method thereof |
| 03/27/2013 | CN102996115A Direct-reading examining seal instrument suitable for eccentric water distributor |
| 03/27/2013 | CN102996114A Inclined hole correction method of logging information |
| 03/27/2013 | CN102996113A Method for testing plugging capacity of polymer while-drilling leakproof plugging drilling system |
| 03/27/2013 | CN102996112A Method for testing plugging capacity of sulphonated polymer while-drilling leakproof plugging system |
| 03/27/2013 | CN102360703B Magnet structure of petroleum underground nuclear magnetic resonance logging while drilling apparatus |
| 03/27/2013 | CN102146779B Underground locating and angle-fixing drilling and windowing tool for horizontal well |
| 03/27/2013 | CN101922289B Temperature compensation structure of optical fiber detector for high-temperature oil well |
| 03/27/2013 | CN101864945B Multi-oil-well continuous metering system based on programmable controller, and metering method thereof |
| 03/27/2013 | CN101845950B Continuous oil pipe operation pit bottom wireless data transmission system |
| 03/27/2013 | CN101793140B Automatically timing oil meter |
| 03/27/2013 | CN101598016B Depth multi-point correction method for horizontal positioning drill guide instrument |
| 03/27/2013 | CN101313128B Protective barriers for small devices |
| 03/26/2013 | US8407006 Multiple distributed force measurements |
| 03/26/2013 | US8403062 Wellbore method and apparatus for completion, production and injection |
| 03/26/2013 | CA2705511C Apparatus and method for communicating information between a wellbore and surface |
| 03/26/2013 | CA2690380C Apparatus and methods to dissipate heat in a downhole tool |
| 03/21/2013 | WO2013040402A2 Energy radiation generator with uni-polar voltage ladder |
| 03/21/2013 | WO2013040390A2 Energy radiation generator with bi-polar voltage ladder |
| 03/21/2013 | WO2013039782A2 System, apparatus and method for generating power in a fluid conduit |
| 03/21/2013 | WO2013039721A1 Accumulator having operating fluid volume independent of external hydrostatic pressure |
| 03/21/2013 | WO2013039712A1 Acoustic logging while drilling tool with active control of source orientation |
| 03/21/2013 | WO2013039636A2 Connection method of replaceable sensors for resistivity arrays |
| 03/21/2013 | WO2013039631A2 Method of phase synchronization of mwd or wireline apparatus separated in the string |
| 03/21/2013 | WO2013039485A1 Measuring an adsorbing chemical in downhole fluids |
| 03/21/2013 | WO2013016282A3 Path tracking for directional drilling as applied to attitude hold and trajectory following |
| 03/21/2013 | WO2013012642A3 Distributed temperature sensing with background filtering |
| 03/21/2013 | WO2013009801A3 Estimating a wellbore parameter |
| 03/21/2013 | WO2012170553A3 Method to look ahead of the bit |
| 03/21/2013 | WO2012166395A3 Low-frequency viscosity, density, and viscoelasticity sensor for downhole applications |
| 03/21/2013 | WO2012154415A3 Apparatus and method for drilling wellbores based on mechanical specific energy determined from bit-based weight and torque sensors |
| 03/21/2013 | WO2012052120A3 Method and system for determining the position of an apparatus |
| 03/21/2013 | WO2012048192A3 Ultrasonic telemetry and power transmission through subsea riser casing wall |
| 03/21/2013 | US20130068940 Spectroscopic nanosensor logging systems and methods |
| 03/21/2013 | US20130068526 Systems and methods for downhole bha insulation in magnetic ranging applications |
| 03/21/2013 | US20130068525 Sensor-enabled cutting elements for earth-boring tools, earth-boring tools so equipped, and related methods |
| 03/21/2013 | US20130068453 Dual purpose observation and production well |
| 03/21/2013 | US20130068452 Setting the value of an operational parameter of a well |
| 03/21/2013 | US20130068451 Tools and Methods for Use in Completion of a Wellbore |
| 03/21/2013 | US20130068008 High temperature piezoresistive strain gauges made of silicon-on-insulator |
| 03/21/2013 | US20130068007 Compact Surface Well Testing System and Method |