| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 10/07/2009 | CN101550826A Machinery wireless well deviation measurement instrument while drilling |
| 10/07/2009 | CN101550825A Double- stroke flexible pumping unit annular gas test wellhead |
| 10/07/2009 | CN101550824A Temperature difference type single well metering device |
| 10/07/2009 | CN101550823A Method and device for improving the accuracy of flow rate test of flowmeter used for water injection wells in oil fields |
| 10/07/2009 | CN101550822A Method and device for improving accuracy of layered flow rate test by ultrasonic flowmeter used for water injection well in oil fields |
| 10/07/2009 | CN101550819A Flexible sucker rod string uphole and downhole technique |
| 10/07/2009 | CN100547224C Drill pipe for oil, gas well, drill string and its forming method, method for communicating with oil, gas well equipment |
| 10/07/2009 | CA2661471A1 Device and method for calibrating a fiber-optic temperature measuring system |
| 10/06/2009 | US7599825 Shoulder bed effects removal |
| 10/06/2009 | US7597143 Method and apparatus for logging downhole data |
| 10/06/2009 | US7597142 System and method for sensing a parameter in a wellbore |
| 10/06/2009 | US7596996 Christmas tree with internally positioned flowmeter |
| 10/06/2009 | CA2448435C Method of determining the extent of recovery of materials injected into oil wells |
| 10/06/2009 | CA2392451C Downhole device |
| 10/04/2009 | CA2681156A1 Tool and method for evaluating fluid dynamic properties of a cement annulus surrounding a casing |
| 10/01/2009 | WO2009120816A2 Determination of irreducible water cut-off using two dimensional nuclear magnetic resonance data |
| 10/01/2009 | WO2009120773A2 Method for compensating drill pipe and near-borehole effect on and electronic noise in transient resistivity measurements |
| 10/01/2009 | WO2009079492A3 Systems and methods for modeling wellbore trajectories |
| 10/01/2009 | WO2009038886A9 Method and system for cleat characterization in coal bed methane wells for completion optimization |
| 10/01/2009 | WO2002086029A3 In situ recovery from a relatively low permeability formation containing heavy hydrocarbons |
| 10/01/2009 | US20090242274 Apparatus for measuring streaming potentials and determining earth formation characteristics |
| 10/01/2009 | US20090242205 Method and apparatus for detecting acoustic activity in a subsurface formation |
| 10/01/2009 | US20090242200 Inspection of an electrically conductive object using eddy currents |
| 10/01/2009 | US20090242199 Systems and techniques to actuate isolation valves |
| 10/01/2009 | US20090242197 Flow control system and method for downhole oil-water processing |
| 09/30/2009 | CN201318171Y Slurry signal impulsator |
| 09/30/2009 | CN201318170Y Underground instrument well-mouth loading-unloading adjusting device |
| 09/30/2009 | CN201318169Y Pulser driving device suitable for 125 DEG C environmental temperature |
| 09/30/2009 | CN201318168Y A special platform base for testing blowout prevention pipe |
| 09/30/2009 | CN201318167Y Wireless receiving digital direct-indicating pressure gauge |
| 09/30/2009 | CN201318166Y Plugging direct reading and pressure testing integrated device |
| 09/30/2009 | CN201318165Y Quick-mounted drilling inclinometer |
| 09/30/2009 | CN201318164Y Damping extension bar |
| 09/30/2009 | CN201318163Y Anticollision fast-assembling pump stroke transducer |
| 09/30/2009 | CN201318162Y Separation circuit in petroleum-well logging surface system equipment |
| 09/30/2009 | CN201318161Y Instrument bracket |
| 09/30/2009 | CN201318160Y Magnetic memory detection apparatus |
| 09/30/2009 | CN101545375A Method for implementing pipe conveying well measuring component |
| 09/30/2009 | CN101545374A Relay transmission measurement-while-drilling system |
| 09/30/2009 | CN101545373A Over flow forecasting method |
| 09/30/2009 | CN101545372A Carrier for pipe conveying well measuring component |
| 09/30/2009 | CN101545371A Oil field device of swellable elastic body provided with nano sensors inside and method using same in oil field application |
| 09/29/2009 | US7594434 Downhole tool system and method for use of same |
| 09/29/2009 | CA2502797C Actuation system for a downhole tool |
| 09/29/2009 | CA2475428C Downhole signal communication and measurement through a metal tubular |
| 09/29/2009 | CA2378564C Method and apparatus for determining flow rates |
| 09/29/2009 | CA2351270C Drilling method and measurement-while-drilling apparatus and shock tool |
| 09/29/2009 | CA2314573C System for acquiring data from a facility and method |
| 09/24/2009 | WO2009117591A2 Method and apparatus for eliminating drill effect in pulse induction measurements |
| 09/24/2009 | WO2009117470A2 Downhole fluid characterization based on changes in acoustic properties |
| 09/24/2009 | WO2009117427A2 Autonomous downhole control methods and devices |
| 09/24/2009 | WO2009117424A2 Micro-annulus detection using lamb waves |
| 09/24/2009 | WO2009117305A2 Analysis refracted acoustic waves measured in a borehole |
| 09/24/2009 | WO2009117236A1 Formation evaluation using estimated borehole tool position |
| 09/24/2009 | WO2009117206A2 Method and apparatus for measuring true vertical depth in a borehole |
| 09/24/2009 | WO2009115493A1 Method and apparatus for performing wireline logging operations in an under-balanced well |
| 09/24/2009 | WO2009091283A3 A method of saturated formation permeability determination |
| 09/24/2009 | WO2009089258A3 Joint compression of multiple echo trains using principal component analysis and independent component analysis |
| 09/24/2009 | WO2009079631A3 Downhole tool damage detection system and method |
| 09/24/2009 | WO2009068302A3 Downhole, single trip, multi-zone testing system and downhole testing method using such |
| 09/24/2009 | WO2009056329A3 Method and device for testing the coating of a pipeline while laying the pipeline in a liquid-filled borehole |
| 09/24/2009 | WO2008142585A3 Methods and systems for investigating downhole conditions |
| 09/24/2009 | US20090238663 Drill rod handler |
| 09/24/2009 | US20090236144 Managed pressure and/or temperature drilling system and method |
| 09/24/2009 | US20090235732 Method and apparatus for measuring true vertical depth in a borehole |
| 09/24/2009 | US20090235730 Method for cleaning an oil field capillary tube |
| 09/23/2009 | EP2103960A2 Method and apparatus for determining position in a pipe |
| 09/23/2009 | EP2103776A2 System and method for selectively communicatable hydraulic nipples |
| 09/23/2009 | EP2103775A1 Method and apparatus for performing wireline logging operations in an under-balanced well |
| 09/23/2009 | EP2102960A2 Power supply system for downhole network |
| 09/23/2009 | EP2102451A1 An apparatus for use when gathering parameters from a well flow and also a method of using same |
| 09/23/2009 | CN201314231Y Multifunctional winch signal convertor |
| 09/23/2009 | CN201314230Y Dual-pulse water-contained flow combination instrument |
| 09/23/2009 | CN201314229Y Flexible joint of logging instrument |
| 09/23/2009 | CN201314228Y 电动扶正器 Electric centralizer |
| 09/23/2009 | CN201314227Y Coiled tubing logging reel unit |
| 09/23/2009 | CN201314226Y Inner coupling tubing thermal recovery horizontal well testing device |
| 09/23/2009 | CN101542319A A method of downhole, non-isotopic generation of ionised radiation and an apparatus for use when practising the method |
| 09/23/2009 | CN101542071A Downhole load cell |
| 09/23/2009 | CN101539016A Method for measuring gas-liquid multiphase flow rate by utilizing thermal diffusion and device |
| 09/23/2009 | CN101539015A Underground wireless pressure transmission transmitter |
| 09/23/2009 | CN101539014A Thick oil thermal extraction saturated steam flow metering method |
| 09/23/2009 | CN101539009A Foam drainage well bore simulation experiment device for directional well |
| 09/23/2009 | CN101538994A Thermal extraction measuring well-head high-temperature high-pressure blowout preventer |
| 09/22/2009 | US7591314 Measurement-while-fishing tool devices and methods |
| 09/22/2009 | US7591308 Multi gas well production arrangement |
| 09/22/2009 | US7591307 Method of and system for determining the free point in a drill pipe |
| 09/22/2009 | US7591175 Magnetic separation in fluids |
| 09/22/2009 | CA2569059C Pressure monitoring of control lines for tool position feedback |
| 09/20/2009 | CA2658890A1 Downhole telemetry through multi-conductor wireline |
| 09/18/2009 | CA2658704A1 Optical fiber feedthrough using axial seals for bi-directional sealing |
| 09/17/2009 | WO2009114234A2 Visualization techniques for oilfield operations |
| 09/17/2009 | WO2009113894A1 Logging system for use below electric submersible pumps |
| 09/17/2009 | WO2009113877A2 Device for pressure testing of pipes |
| 09/17/2009 | WO2009091763A3 Method and apparatus for estimating a downhole fluid property |
| 09/17/2009 | WO2009085615A3 Borehole imaging and orientation of downhole tools |
| 09/17/2009 | US20090230295 Measurement of hydraulic conductivity using a radioactive or activatable tracer |
| 09/17/2009 | US20090229882 Distributed sensors-controller for active vibration damping from surface |
| 09/17/2009 | US20090229820 Downhole Sensor Interface |
| 09/17/2009 | US20090229819 Visualization techniques for oilfield operations |