| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 04/23/2008 | CN201050363Y Spiral type leather ball current collector |
| 04/23/2008 | CN201050362Y Oil, gas, water three-phase film combined probe for logger for water and oil |
| 04/23/2008 | CN201050361Y Well mouth oil pipe pressure tester |
| 04/23/2008 | CN201050360Y Geothermal well water level observation device |
| 04/23/2008 | CN201050359Y Oil production well liquid level continuous tester |
| 04/23/2008 | CN201050358Y Device for monitoring oil well pumping unit start-stop and collecting up and down stroke electric current and punching number |
| 04/23/2008 | CN201050340Y Double-walled drilling faucet |
| 04/23/2008 | CN201050328Y Multipurpose packer for water plugging and pressure testing |
| 04/23/2008 | CN201050317Y Suspension sub of auxiliary bushing |
| 04/23/2008 | CN101166887A U-shaped fiber optical cable assembly for use in a heated well and methods for installing and using the assembly |
| 04/23/2008 | CN101165314A Intelligent seal-testing flow-measuring and adjusting device and method |
| 04/22/2008 | US7362422 Method and apparatus for a downhole spectrometer based on electronically tunable optical filters |
| 04/22/2008 | US7360588 Thermal processes for subsurface formations |
| 04/22/2008 | US7360412 Single point and fiber optic temperature measurement for correction of a gas column weight in a well |
| 04/22/2008 | CA2524666C Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/22/2008 | CA2476259C Dual channel downhole telemetry |
| 04/22/2008 | CA2460525C Fluid skin friction sensing device and method |
| 04/22/2008 | CA2326900C Apparatus and method for enhancing remote sensor performance |
| 04/22/2008 | CA2238334C Autonomous downhole oilfield tool |
| 04/19/2008 | CA2606657A1 Optical turnaround |
| 04/17/2008 | WO2008043769A1 Method and apparatus for pressure measurements in well testing |
| 04/17/2008 | WO2007149324A3 Estimation of properties of mud |
| 04/17/2008 | WO2007034131A8 Electro-chemical sensor |
| 04/17/2008 | US20080089175 Well downhole condition signalling |
| 04/17/2008 | US20080087424 Downhole intelligent impact jar |
| 04/17/2008 | US20080087423 Method and Apparatus for a Monodiameter Wellbore, Monodiameter Casing, Monobore, and/or Monowell |
| 04/17/2008 | US20080087422 Method of collecting hydrocarbons using a barrier tunnel |
| 04/17/2008 | US20080087413 Groundwater sampling device |
| 04/17/2008 | US20080087078 Logging System and Method for In-Situ Fluids Sensing Through Optical Fiber With Attenuation Compensation |
| 04/16/2008 | EP1912052A1 Method and apparatus for pressure measurements in well testing |
| 04/16/2008 | CN201047913Y Oil level automatic control device of deep buried oil trap |
| 04/16/2008 | CN201047283Y Dividingly pouring test core |
| 04/16/2008 | CN201047282Y Caliper logging instrument output device |
| 04/16/2008 | CN201047281Y Combination logging tool |
| 04/16/2008 | CN101163860A Low temperature system for underground barriers |
| 04/15/2008 | US7359801 Method and system for evaluating weight data from a service rig |
| 04/15/2008 | US7357886 Singular molded and co-molded electronic's packaging pre-forms |
| 04/15/2008 | US7357197 Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface |
| 04/15/2008 | US7357196 Method and system for predicting performance of a drilling system for a given formation |
| 04/15/2008 | US7357179 Methods of using coiled tubing inspection data |
| 04/15/2008 | US7357021 Methods of monitoring downhole conditions |
| 04/15/2008 | CA2489928C Apparatus and method of monitoring and signaling for downhole tools |
| 04/15/2008 | CA2418758C Interactive and/or secure activation of a tool |
| 04/15/2008 | CA2282342C Bottomhole assembly and methods of use |
| 04/10/2008 | WO2008042166A2 Improved methods and apparatus to determine vessel draft and amount of cargo loaded in a vessel |
| 04/10/2008 | US20080086270 Seismic Measurements While Drilling |
| 04/10/2008 | US20080083533 Diagnostic sleeve shifting tool |
| 04/10/2008 | US20080083532 Methods for Maximizing Second Fracture Length |
| 04/10/2008 | US20080083529 Downhole Coils |
| 04/10/2008 | US20080083273 Apparatus and methods for estimating a characteristic of a fluid downhole using thermal properties of the fluid |
| 04/09/2008 | CN201045286Y Novel test blowout preventer |
| 04/09/2008 | CN201045282Y Petroleum drill pipe joint capable of transmitting electric power and signal |
| 04/09/2008 | CN201044913Y Well testing wire lubricator |
| 04/09/2008 | CN101158284A Single-core cable well logging data high speed transmission system |
| 04/09/2008 | CN101158267A Method and system for accessing subterranean deposits from the surface |
| 04/09/2008 | CN100379939C Method for measuring formation characteristics by utilizing time-limited formation test |
| 04/08/2008 | US7355163 Direct measurement of Brillouin frequency in distributed optical sensing systems |
| 04/08/2008 | US7353869 System and method for utilizing a skin sensor in a downhole application |
| 04/08/2008 | US7353613 Directional sensor system comprising a single axis sensor element positioned at multiple controlled orientations |
| 04/08/2008 | CA2487222C Downhole tool sensor system and method |
| 04/08/2008 | CA2455304C System and method for monitoring performance of downhole equipment using fiber optic based sensors |
| 04/08/2008 | CA2443140C Internal pressure indicator and locking mechanism for a downhole tool |
| 04/08/2008 | CA2441242C Pressure sensor insert for a downhole tool |
| 04/08/2008 | CA2177021C Microscopy imaging of earth formations |
| 04/03/2008 | WO2008040030A2 Improving formation evaluation using estimated borehole tool position |
| 04/03/2008 | WO2008039831A1 Estimating a formation property |
| 04/03/2008 | WO2007127365A3 Method and apparatus for correcting underestimation of formation anistropy ratio |
| 04/03/2008 | US20080082270 Method for Analyzing Data Having Shared and Distinct Properties |
| 04/03/2008 | US20080079605 Sonde Attachment Means |
| 04/03/2008 | US20080078580 Tool for azimuthal resistivity measurement and bed boundary detection |
| 04/03/2008 | US20080078556 Optical wet connect |
| 04/03/2008 | US20080078544 Method and Apparatus for Performing Spectroscopy Downhole within a Wellbore |
| 04/03/2008 | US20080078543 Methods of Quantifying Gas Content of a Gas-Sorbed Formation Solid |
| 04/03/2008 | US20080078242 Formation evaluation using estimated borehole tool position |
| 04/03/2008 | CA2605045A1 Real time telemetry |
| 04/02/2008 | EP1904715A1 Method and associated system for setting downhole control pressure |
| 04/02/2008 | CN201044457Y Radio communication device at artesian well spot |
| 04/02/2008 | CN201044195Y Pull rod type potentiometer circuit special for well logging |
| 04/02/2008 | CN201043463Y Automatic detection instrument for dynamic liquid level of oil well |
| 04/02/2008 | CN201043462Y Casting and dragging combined head for separate injection well test |
| 04/02/2008 | CN201043461Y Individual well oil storage measuring and heating integrated tank |
| 04/01/2008 | US7351034 Impeller device for data acquisition in a flow |
| 04/01/2008 | US7350597 Drilling system and method |
| 04/01/2008 | US7350594 System and method for tracking and communicating with a boring tool |
| 04/01/2008 | US7350590 Instrumentation for a downhole deployment valve |
| 04/01/2008 | US7350569 Separable plug for use in a wellbore |
| 04/01/2008 | US7350568 Logging a well |
| 04/01/2008 | US7350410 System and method for measurements of depth and velocity of instrumentation within a wellbore |
| 04/01/2008 | US7350409 Magnetic separation in fluids |
| 04/01/2008 | CA2492962C While drilling system and method |
| 04/01/2008 | CA2308944C Well reference apparatus and method |
| 04/01/2008 | CA2273668C Inductor for a submersible pumping system |
| 04/01/2008 | CA2254770C Downhole tool |
| 03/27/2008 | WO2008036793A2 Downhole noise cancellation in mud-pulse telemetry |
| 03/27/2008 | WO2008036790A2 Downhole depth computation methods and related system |
| 03/27/2008 | WO2008034870A1 Inspection of an electrically conductive object using eddy currents |
| 03/27/2008 | WO2008034867A2 Device and method for detecting an anomaly in an assembly of a first and a second object |
| 03/27/2008 | WO2008034761A1 Contact-less sensor cartridge |
| 03/27/2008 | WO1999057417A3 Chemical actuation system for downhole tools and method for detecting failure of an inflatable element |
| 03/27/2008 | US20080074948 Downhole Noise Cancellation in Mud-Pulse Telemetry |