| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/06/2013 | CN102080531B Method for production metering of oil wells |
| 03/06/2013 | CN102061907B Flow section scanning imager |
| 03/06/2013 | CN101956549B Electromagnetic focusing sleeve screw thread logging instrument |
| 03/06/2013 | CN101881133B Rotary drilling rig and deep sounding apparatus thereof |
| 03/06/2013 | CN101440707B Coal-bed gas pressure measuring instrument and measuring method thereof |
| 03/05/2013 | US8390280 Inspection of an electrically conductive object using eddy currents |
| 03/05/2013 | US8387722 Strength (UCS) of carbonates using compressional and shear acoustic velocities |
| 03/05/2013 | US8387688 Method of forming subterranean barriers with molten wax |
| 02/28/2013 | WO2013028744A1 Drill bit mounted data acquisition systems and associated data transfer apparatus and method |
| 02/28/2013 | WO2013028515A2 Wellbore leak detection systems and methods of using the same |
| 02/28/2013 | WO2013028271A1 Apparatus and method for controlling a completion operation |
| 02/28/2013 | WO2013003152A3 Distributed sensors to measure cement state |
| 02/28/2013 | WO2012162212A3 Detection of gas influx into a wellbore |
| 02/28/2013 | WO2012158381A3 Systems and methods for single-phase fluid sampling |
| 02/28/2013 | WO2012125934A3 Piezoelectric transducer and downhole tool for measuring fluid properties |
| 02/28/2013 | WO2012103474A3 Improving diversion by combining dissolvable and degradable particles and fibers |
| 02/28/2013 | WO2012001355A3 Riser wireless communications system |
| 02/28/2013 | US20130053284 Modular Roller Oven and Associated Methods |
| 02/28/2013 | US20130051177 Full Flow Pulser for Measurement While Drilling (MWD) Device |
| 02/28/2013 | US20130048381 Drill bit-mounted data acquisition systems and associated data transfer apparatus and method |
| 02/28/2013 | US20130048380 Wellbore interval densities |
| 02/28/2013 | US20130048378 Method and apparatus for opening threaded joints of drilling equipment |
| 02/28/2013 | US20130048275 Apparatus and Method for Controlling a Completion Operation |
| 02/28/2013 | US20130048269 Transmission system for communication between downhole elements |
| 02/28/2013 | US20130047696 Interval density pressure management methods |
| 02/28/2013 | DE102012017287A1 Schätzung und Kompensation von druck- und durchflussinduzierter Verzerrung in der Schlammimpulstelemetrie Estimation and compensation of pressure and flow-induced distortion in the mud pulse telemetry |
| 02/28/2013 | DE102011081870A1 System und Verfahren zur Signalübertragung in Bohrlöchern System and method for signal transmission in boreholes |
| 02/28/2013 | CA2845878A1 Drill bit-mounted data acquisition systems and associated data transfer apparatus and method |
| 02/28/2013 | CA2842942A1 Apparatus and method for controlling a completion operation |
| 02/28/2013 | CA2787692A1 Emergency disconnect sequence video sharing |
| 02/28/2013 | CA2787609A1 Method, device and system for monitoring subsea components |
| 02/27/2013 | EP2562349A2 Methods and systems for drilling |
| 02/27/2013 | EP2561422A2 An expert system for selecting fit-for-purpose technologies and wells for reservoir saturation monitoring |
| 02/27/2013 | EP2561382A2 Detection of seismic signals using fiber optic distributed sensors |
| 02/27/2013 | EP2561184A2 Apparatus and methods for estimating tool inclination using bit-based gamma ray sensors |
| 02/27/2013 | EP2561183A2 Detection of tool in pipe |
| 02/27/2013 | EP2561182A2 Formation evaluation using a bit-based active radiation source and a gamma ray detector |
| 02/27/2013 | CN202755969U Data-obtainable type oil sleeve annulus burglar alarm |
| 02/27/2013 | CN202755968U Electromagnetic induction signal coupler |
| 02/27/2013 | CN202755967U Wireless two-way signal transmission device between loop and spindle in downhole guiding drilling tool |
| 02/27/2013 | CN202755966U Monitoring tool and testing tubular column for temperature fields and pressure fields of pit shaft |
| 02/27/2013 | CN202755965U Portable well mouth pressure-reading instrument |
| 02/27/2013 | CN202755964U Underground medium interface monitoring device |
| 02/27/2013 | CN202755963U Magnetic field emission source guide joint |
| 02/27/2013 | CN202755962U Digital pumping unit simulating experiment table |
| 02/27/2013 | CN202755910U Cable drill pipe information transmission connector |
| 02/27/2013 | CN102943669A High-accuracy depth domain stochastic simulation inversion method suitable for designing track of horizontal well |
| 02/27/2013 | CN102943668A Underground drilling-following acoustic signal transmission device |
| 02/27/2013 | CN102943667A Temperature regulation and control method for observing fluid flow in porous medium |
| 02/27/2013 | CN102943666A Back pressure mechanism for observing fluid flow in porous medium |
| 02/27/2013 | CN102943665A Real-time observation mechanism of flowing of fluid in porous medium |
| 02/27/2013 | CN102943664A Simulation system used for observing fluid flowing in porous media |
| 02/27/2013 | CN102943663A Device and method for measuring pressure of wall of inclined shaft |
| 02/27/2013 | CN102943662A Salvageable wireless while-drilling electromagnetic wave resistivity measuring nipple |
| 02/27/2013 | CN102943661A Propeller for pump stroke and production logging equipment |
| 02/27/2013 | CN102943660A Method for estimating efficiency of bore-cleaning operation of drilling |
| 02/27/2013 | CN102943646A Pressure measuring ball valve for once multiple gravel pack tool |
| 02/27/2013 | CN102943638A Water jet cleaning system for large-diameter deep well |
| 02/27/2013 | CN102943623A Methods and systems for drilling |
| 02/27/2013 | CN102943620A Pressure-controlled drilling method based on drilling annulus wellbore multi-phase flow computing |
| 02/27/2013 | CN101787878B Intelligent injection allocation instrument of water injection well |
| 02/27/2013 | CN101499330B 电缆 Cable |
| 02/26/2013 | US8386225 Method of optimizing the development of a fluid reservoir by taking into account a geologic and transient exchange term between matrix blocks and fractures |
| 02/26/2013 | US8386181 System and method for bent motor cutting structure analysis |
| 02/26/2013 | US8386059 Well prog execution facilitation system and method |
| 02/26/2013 | US8381838 System and apparatus for directing the drilling of a well |
| 02/26/2013 | US8381812 Barrier for instrumentation piping |
| 02/26/2013 | US8381811 Method of enhancing adsorption of an inhibitor onto a wellbore region |
| 02/26/2013 | CA2695593C System and method for stress field based wellbore steering |
| 02/26/2013 | CA2679752C Well jet device |
| 02/26/2013 | CA2380372C A method and apparatus for measuring forces in the presence of external pressure |
| 02/21/2013 | WO2013025686A1 System, apparatus and method for producing a well |
| 02/21/2013 | WO2013025528A2 Method and apparatus for calibrating deep-reading multi-component induction tools with minimal ground effects |
| 02/21/2013 | WO2013025222A2 Improved casing detection tools and methods |
| 02/21/2013 | WO2013025188A1 Systems and methods for the evaluation of passive pressure containment barriers |
| 02/21/2013 | WO2013023245A1 Optical device for use with download equipment |
| 02/21/2013 | WO2013006421A3 Downhole sensors impregnated with hydrophobic material, tools including same, and related methods |
| 02/21/2013 | WO2012173797A3 Hydrocarbon detection in annulus of well |
| 02/21/2013 | WO2012162500A3 Power system for high temperature applications with rechargeable energy storage |
| 02/21/2013 | WO2012010821A3 Communication through an enclosure of a line |
| 02/21/2013 | US20130043874 Drill bit assembly having electrically isolated gap joint for measurement of reservoir properties |
| 02/21/2013 | US20130042677 Method For Quantitatively Assessing Connectivity For Well Pairs At Varying Frequencies |
| 02/21/2013 | CA2845614A1 System, apparatus and method for producing a well |
| 02/21/2013 | CA2844111A1 Improved casing detection tools and methods |
| 02/21/2013 | CA2843191A1 Optical device for use with downhole equipment |
| 02/21/2013 | CA2843127A1 Systems and methods for the evaluation of passive pressure containment barriers |
| 02/20/2013 | EP2559842A1 A method of directing vertical drillings |
| 02/20/2013 | EP2558682A2 Communication system for transmitting information relating to drilling rods |
| 02/20/2013 | EP2558681A1 Production logging processes and systems |
| 02/20/2013 | EP2558673A2 Methods and systems for drilling |
| 02/20/2013 | CN202750063U Non-contact limit switch for oil well logging apparatus |
| 02/20/2013 | CN202749854U Continuous power supply device in oil drill stem vibration measuring system |
| 02/20/2013 | CN202745865U Array-type electrode system of induced polarization potential logging instrument |
| 02/20/2013 | CN202745864U Signal receiving derailing switch for realizing downhole communication of oil field |
| 02/20/2013 | CN202745863U Device for controlling transverse vibration of drill column during reaming along with drill |
| 02/20/2013 | CN202745862U Experimental facility for testing internal pressure of hydraulic jet hole |
| 02/20/2013 | CN202745861U Compensation-type pressure-measuring drilling water-gas separation water discharging device |
| 02/20/2013 | CN202745860U Down-hole pipe string stress monitoring device |
| 02/20/2013 | CN202745859U Rock stratum crack detection device |
| 02/20/2013 | CN202745858U Drill hole volume deformation testing device |