| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 04/03/2013 | CN202856693U Power amplifying circuit of underground nuclear magnetic resonance logging instrument |
| 04/03/2013 | CN202850991U Three-dimensional well pattern model for in-situ extraction of shale oil |
| 04/03/2013 | CN202850990U Mechanical parameter measuring equipment for near-bit drilling tool mechanical parameter in well |
| 04/03/2013 | CN202850989U High speed data transmission system based on single-core logging cable |
| 04/03/2013 | CN202850988U Double-tracing thin recognizer |
| 04/03/2013 | CN202850987U Positioning device for magnetic field in well |
| 04/03/2013 | CN202850986U Split type shockproof pressure meter supporting cylinder for oil field well testing |
| 04/03/2013 | CN202850985U Installation and monitoring device for casing pipe valve in well |
| 04/03/2013 | CN202850984U Deepwater drilling pressure data acquisition device |
| 04/03/2013 | CN202850983U Drilling depth rapid detector |
| 04/03/2013 | CN202850982U Electronic survey system (ESS) multipoint clinometer special for offshore oil platform |
| 04/03/2013 | CN202850981U During-drilling gyro balancing machine |
| 04/03/2013 | CN202850980U Down-hole drainage drilling hole construction video automatic monitoring system |
| 04/03/2013 | CN202850979U Measuring electrode for cased-hole resistivity logging instrument |
| 04/03/2013 | CN202850978U Flexible weight-balancing bar for annulus well logging |
| 04/03/2013 | CN202850977U Wellhead tension real-time display device |
| 04/03/2013 | CN202850976U Gas and water flowing state and effect simulator in coalbed methane well discharging and mining process |
| 04/03/2013 | CN202850975U Skid-mounted type double-volume automatic metering device |
| 04/03/2013 | CN202850974U Oil-gas-water three-phase output section logging instrument for low-yield liquid well |
| 04/03/2013 | CN202850973U Portable instrument adjusting device |
| 04/03/2013 | CN202850972U Descending boosting device of oil well test instrument |
| 04/03/2013 | CN202850966U Single tube sand filling model device used for profile control |
| 04/03/2013 | CN202850906U Delivering-in guide tool for locking device |
| 04/03/2013 | CN202850900U Downhole tool integrating operations of detection, washing and fishing of oil well |
| 04/03/2013 | CN202850883U Cable bypass piecing device in well |
| 04/03/2013 | CN103025995A Blowout preventer monitoring system and method of using same |
| 04/03/2013 | CN103015997A Filtration plugging testing apparatus and simulation method for process of fracture temporary plugging by ice crystals |
| 04/03/2013 | CN103015991A Ultrasonic imaging device for walls of well |
| 04/03/2013 | CN103015990A Downhole mud positive pulse generator |
| 04/03/2013 | CN103015989A Downhole continuous wave mud pulse generator |
| 04/03/2013 | CN103015988A Wireless data exchange formation test system and test method thereof |
| 04/03/2013 | CN103015987A Annular space radial variation monitoring method |
| 04/03/2013 | CN103015986A Method for directly measuring gas pressure of coal bed of underground coal mine |
| 04/03/2013 | CN103015985A Two-dimensional visual simulation device for inflow performances of horizontal well and vertical well |
| 04/03/2013 | CN103015984A Method for measuring gas pressure of coal seam by casing high-pressure hole sealing method |
| 04/03/2013 | CN103015983A Bailing well cage total testing system |
| 04/03/2013 | CN103015982A Automatic liquid level tester for high-temperature jacket gas oil well |
| 04/03/2013 | CN103015981A Method for optimizing structure of multi-ring electrode array sensor based on genetic algorithm |
| 04/03/2013 | CN103015980A Working fluid level gauge for transmitting and receiving infrasonic waves and method thereof |
| 04/03/2013 | CN103015979A Tool and process for locating eye of branch well |
| 04/03/2013 | CN103015978A Mine video scanning data acquiring system |
| 04/03/2013 | CN103015977A Panoramic video scanning device for jack shaft |
| 04/03/2013 | CN103015976A Test method for simulating restoration of deformation sleeve under stratum confining pressure |
| 04/03/2013 | CN103015975A Gas production rate testing simulation device of coal-bed gas vertical well |
| 04/03/2013 | CN103015974A Measuring probe of oil-base mud logger |
| 04/03/2013 | CN103015973A Simulation device for obtaining drilling parameter in pressure-controllable drilling |
| 04/03/2013 | CN103015972A Oil-based mud measuring polar plate |
| 04/03/2013 | CN103015971A Underground earth potential measuring method and electrode |
| 04/03/2013 | CN103015970A Simulated detection equipment for measurement-while-drilling resistivity logging instrument |
| 04/03/2013 | CN103015969A Multiphase flow metering system |
| 04/03/2013 | CN103015968A Method for measuring oil-well products by using mass and liquid level |
| 04/03/2013 | CN103015967A Method of controlling direction of toolface of bottom hole assembly for slide drilling |
| 04/03/2013 | CN103015916A Integral type directional drill rod provided with helical groove |
| 04/03/2013 | CN103010995A Control equipment for wireline logging winch |
| 04/03/2013 | CN102221712B Automatic testing method of wire line coring drilling hoisting-free pressurized water test |
| 04/03/2013 | CN102155214B Detection device for gyrolevel |
| 04/03/2013 | CN102071927B Piezoelectric ceramic electro-acoustic transducer with cylindrical ring structure |
| 04/03/2013 | CN102003172B Logging depth correction computation method in logging system |
| 04/03/2013 | CN102003170B Calculating method for SAGD (Steam-Assisted Gravity Drainage) double-horizontal well drilling electromagnetic distance measurement guide |
| 04/03/2013 | CN101858209B Synchronous detection method of terrane crack distribution of base plate |
| 04/03/2013 | CN101845948B Radiation detector |
| 04/03/2013 | CN101755106B System and method for an AC powered downhole gauge |
| 04/03/2013 | CN101718194B Cap-type measuring line falling protector |
| 04/02/2013 | US8408355 Enclosures for containing transducers and electronics on a downhole tool |
| 04/02/2013 | US8408330 Systems and methods for canceling noise and/or echoes in borehole communication |
| 04/02/2013 | US8408313 Methods for application of reservoir conditioning in petroleum reservoirs |
| 04/02/2013 | US8408297 Remote operation of an oilfield device |
| 04/02/2013 | US8408295 Method for testing connectors |
| 04/02/2013 | CA2740063C Electromagnetic borehole telemetry system incorporating a conductive borehole tubular |
| 04/02/2013 | CA2694851C Methods and apparatus for actuating a downhole tool |
| 04/02/2013 | CA2691720C Downlink telemetry system |
| 04/02/2013 | CA2691410C Parallel-path acoustic telemetry isolation system and method |
| 04/02/2013 | CA2651097C Method and apparatus for tensorial micro-resistivity imaging in oil-based muds |
| 04/02/2013 | CA2573467C Computer-based method for while-drilling modeling and visualization of layered subterranean earth formations |
| 03/28/2013 | WO2013043682A2 System and method for correction of downhole measurements |
| 03/28/2013 | WO2013043663A2 Dual purpose observation and production well |
| 03/28/2013 | WO2013043555A1 Sensor-enabled cutting elements for earth-boring tools, earth-boring tools so equipped, and related methods |
| 03/28/2013 | WO2013043353A1 Multiple spectrum channel, multiple sensor fiber optic monitoring system |
| 03/28/2013 | WO2013043217A2 Apparatus and method of concentric cement bonding operations before and after cementation |
| 03/28/2013 | WO2013040641A1 Borehole surveying tool deployment |
| 03/28/2013 | WO2013019554A3 Viscometer for downhole use |
| 03/28/2013 | WO2012149133A3 Automated systems and methods for make-up and break-out of tubulars |
| 03/28/2013 | WO2012042499A3 Data retrieval device for downhole to surface telemetry systems |
| 03/28/2013 | WO2012012587A3 Apparatus and method for enhancing subsurface surveys |
| 03/28/2013 | WO2012010835A3 Monitoring of objects in conjunction with a subterranean well |
| 03/28/2013 | US20130080063 Mud pulse telemetry |
| 03/28/2013 | US20130076907 Mobile wellsite monitoring |
| 03/28/2013 | US20130075161 Methods of evaluating rock properties while drilling using downhole acoustic sensors and a downhole broadband transmitting system |
| 03/28/2013 | US20130075157 Methods for evaluating rock properties while drilling using drilling rig-mounted acoustic sensors |
| 03/28/2013 | US20130075091 Wellbore surveillance system |
| 03/28/2013 | US20130075090 Wellbore fluid treatment and method |
| 03/28/2013 | US20130075087 Module For Use With Completion Equipment |
| 03/28/2013 | US20130074322 Apparatus and Method for Fluid Flow Measurement with Sensor Shielding |
| 03/28/2013 | CA2849001A1 Borehole surveying tool deployment |
| 03/28/2013 | CA2847875A1 Dual purpose observation and production well |
| 03/27/2013 | EP2573316A1 Method and Device for Well Communication |
| 03/27/2013 | CN202837984U Drilling well parameter monitoring system for supporting big screen projection display |
| 03/27/2013 | CN202837983U Drilling well parameter handset monitoring system based on 3G network |
| 03/27/2013 | CN202834674U Well dredging testing analysis lubricator |
| 03/27/2013 | CN202833431U Valve system of stable pressure maintaining hydraulic pump |