| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/08/2013 | CN103089243A Measuring method of drilling well azimuth in magnetic casing pipe |
| 05/08/2013 | CN103089242A Active magnetic field calibration method for measurement while drilling (MWD) directional probe |
| 05/08/2013 | CN103089241A Heat insulation and preservation device |
| 05/08/2013 | CN103089240A Visualization experiment device and method for transport law of coal dust in cracks |
| 05/08/2013 | CN103089239A Methods and systems for determining standoff between downhole tool and geological formation |
| 05/08/2013 | CN103089238A Measurement of relative turns and displacement in subsea running tools |
| 05/08/2013 | CN103089237A System and method for testing rock breaking performance of gear ring of drill bit |
| 05/08/2013 | CN103089236A Drill bit performance parameter test system |
| 05/08/2013 | CN103089235A Drill bit performance test system for oil production process |
| 05/08/2013 | CN103089234A Drill bit performance testing system applicable to field of oil exploitation |
| 05/08/2013 | CN103089233A Installation structure of radioactive source for radioactivity logging device |
| 05/08/2013 | CN103089232A Methods for detecting logging equipment and correcting consistency |
| 05/08/2013 | CN103089159A Intelligent drilling rod with chip and intelligent drilling rod data transmission device |
| 05/08/2013 | CN102267673B Electrical transmission control system and method for well logging winch |
| 05/08/2013 | CN102200009B Method for processing MWD (Measurement While Drilling) underground continuous wave signal |
| 05/08/2013 | CN102155215B Horizontal well dual caliper |
| 05/08/2013 | CN102011575B Method for optimizing structure of annular water retention rate logging sensor array |
| 05/08/2013 | CN101787882B Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same |
| 05/08/2013 | CN101718195B Slurry pulse generator |
| 05/08/2013 | CN101260804B Systems and methods for well data compression |
| 05/08/2013 | CN101255792B Making directional measurements using a rotating and non-rotating drilling apparatus |
| 05/07/2013 | US8437975 Subsea accumulator monitoring system |
| 05/07/2013 | US8437220 Parallel-path acoustic telemetry isolation system and method |
| 05/07/2013 | US8434568 Method and system for circulating fluid in a well system |
| 05/07/2013 | US8434567 Borehole drilling apparatus, systems, and methods |
| 05/07/2013 | US8434356 Fluid density from downhole optical measurements |
| 05/02/2013 | WO2013063378A2 Well completion method to allow dual monitoring of reservoir saturation and pressure |
| 05/02/2013 | WO2013063338A2 Methods for optimizing and monitoring underground drilling |
| 05/02/2013 | WO2013062949A1 High-speed downhole sensor and telemetry network |
| 05/02/2013 | WO2013062665A1 Methods and systems of formation density measurements in the presence of invasion of drilling fluids |
| 05/02/2013 | WO2013062591A1 Methods and systems for well planning based on a complex fracture model |
| 05/02/2013 | WO2013062525A1 Methods and systems for providing a package of sensors to enhance subterranean operations |
| 05/02/2013 | WO2013062446A1 Method for determining the inflow profile of fluids of multilayer deposits |
| 05/02/2013 | WO2013062417A1 Method and system for using tracer shots for estimating influx volumes of fluids from different influx zones to a production flow in a well |
| 05/02/2013 | WO2013022725A3 Realtime dogleg severity prediction |
| 05/02/2013 | WO2012178026A3 Method for determining spacing of hydraulic fractures in a rock formation |
| 05/02/2013 | US20130110458 Method and apparatus for initialization of a tool via a remote reference source |
| 05/02/2013 | US20130110403 Method and apparatus for determining the nature of a material in a cavity between one inner metal wall and one outer metal wall |
| 05/02/2013 | US20130110402 Method and Apparatus for In-Situ Wellbore Measurement and Control with Inductive Connectivity |
| 05/02/2013 | US20130105222 Sensor Mounting Assembly for Drill Collar Stabilizer |
| 05/02/2013 | US20130105221 Methods For Optimizing And Monitoring Underground Drilling |
| 05/02/2013 | US20130105150 Completion method to allow dual reservoir saturation and pressure monitoring |
| 05/02/2013 | US20130105149 Safety valve with electrical actuator and tubing pressure balancing |
| 05/02/2013 | US20130105148 Hydrocarbon detection in annulus of well |
| 05/02/2013 | US20130104644 Coiled Member Measuring Device |
| 05/02/2013 | US20130104643 Tool for testing downhole tubing |
| 05/02/2013 | US20130104642 Method and system of determining constituent components of a fluid sample |
| 05/02/2013 | US20130104641 Apparatus and methods for orienting, stabilizing, or stably operating a logging tool |
| 05/02/2013 | CA2853274A1 Methods and systems for providing a package of sensors to enhance subterranean operations |
| 05/02/2013 | CA2853118A1 Methods for optimizing and monitoring underground drilling |
| 05/02/2013 | CA2852630A1 Method and system for using tracer shots for estimating influx volumes of fluids from different influx zones to a production flow in a well |
| 05/02/2013 | CA2852004A1 Methods and systems of formation density measurements in the presence of invasion of drilling fluids |
| 05/02/2013 | CA2850109A1 Methods and systems for well planning based on a complex fracture model |
| 05/01/2013 | EP2587227A1 Downhole tool for determining flow velocity |
| 05/01/2013 | EP2586965A2 A downhole logging tool |
| 05/01/2013 | EP2586961A2 Sensor mounting assembly for drill collar stabilizer |
| 05/01/2013 | EP2585857A2 System and method for reservoir characterization |
| 05/01/2013 | EP2585683A2 Apparatus and method for remote actuation of a downhole assembly |
| 05/01/2013 | CN202914093U Natural gamma spectralog service instrument |
| 05/01/2013 | CN202914092U Pressure-bearing plate arranged at end of pressure-bearing electronic compartment of sound wave logger |
| 05/01/2013 | CN202914091U Signal driving and receiving circuit for instrument for measuring downhole flow of oil field |
| 05/01/2013 | CN202914090U Insulation nipples for electromagnetic wave measurement while drilling system |
| 05/01/2013 | CN202914089U Calculation system used for electromagnetic measurement while drilling tool |
| 05/01/2013 | CN202914088U Well site remote transmission information logging well control and analysis system |
| 05/01/2013 | CN202914087U Underground communication system for continuous pipe drilling machine |
| 05/01/2013 | CN202914086U Real-time observation device of fluid flow in porous media |
| 05/01/2013 | CN202914085U Solid particle solidifying simulator |
| 05/01/2013 | CN202914084U High-precision pressure sensor |
| 05/01/2013 | CN202914083U Underground bubbling pressure rapid tester |
| 05/01/2013 | CN202914082U Engineering machinery depth measuring precision device |
| 05/01/2013 | CN202914081U Connection structure of wireless inclinometer underground measuring instrument |
| 05/01/2013 | CN202914080U Warming and metering device for wellhead oil storage |
| 05/01/2013 | CN202914079U Neutron generator working time monitoring device for well logging |
| 05/01/2013 | CN202914078U Single-well three-phrase metering device |
| 05/01/2013 | CN202914077U Single-well three-phrase metering device |
| 05/01/2013 | CN202914076U Single-well metering device |
| 05/01/2013 | CN202914075U Gas drilling information integrated monitoring system |
| 05/01/2013 | CN202914074U Horizontal well open hole filling wiper trip testing tool |
| 05/01/2013 | CN202914073U Downhole flow tester |
| 05/01/2013 | CN202914072U Device for metering gas-liquid two-phase flow at well head of producing well |
| 05/01/2013 | CN202914071U Induction type logging instrument probe short section and mandrel assembly applied to same |
| 05/01/2013 | CN202914070U Drilling and logging integrated comprehensive instrument system for supporting remote monitoring |
| 05/01/2013 | CN202914069U Drilling and logging integrated comprehensive instrument system |
| 05/01/2013 | CN202914054U Concentric electric underground testing and adjusting device |
| 05/01/2013 | CN202913990U Falling object protecting sand washing pen point |
| 05/01/2013 | CN103075149A Method and device for quickly determining gas pressure of coal bed in downward superdeep borehole |
| 05/01/2013 | CN103075148A Method and device for fast measuring coal bed gas pressure through upward remote-distance hole drilling |
| 05/01/2013 | CN103075147A Underground environment simulation device and method |
| 05/01/2013 | CN103075146A Differential temperature and pressure tester for horizontal well for thermal recovery |
| 05/01/2013 | CN103075145A Drill bit direction measuring system |
| 05/01/2013 | CN103075144A Visual experimental device, system and method for coal dust settling in shaft of coal-bed gas well |
| 05/01/2013 | CN103075143A Method for testing fluid-producing section of horizontal pump well |
| 05/01/2013 | CN103075142A Method for selecting water plugging oil well during development of oilfield through water injection |
| 05/01/2013 | CN103074892A Two-shaft, four-shaft and six-shaft interchanging type cement and soil stirring pile device and construction method thereof |
| 05/01/2013 | CN101845949B Indoor simulation device for testing injection/pressure fall of coal bed methane |
| 05/01/2013 | CN101839129B Isotope well-to-well liquid flow propelling automatic monitor |
| 05/01/2013 | CN101806211B Calculation method using solenoid groups to achieve electromagnetic guiding distance measurement while drilling |
| 05/01/2013 | CN101713286B Electromagnetic system for detecting distance between adjacent wells while drilling |
| 05/01/2013 | CN101287888B Well having inductively coupled power and signal transmission |
| 04/30/2013 | US8433551 Machine, computer program product and method to carry out parallel reservoir simulation |