| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/13/2013 | CN202788809U Pup joint device used for testing underground casing valve |
| 03/13/2013 | CN202788808U Down-hole tool pressure testing detection system |
| 03/13/2013 | CN202788807U Liquid level sensor for overflow port in petroleum drilling |
| 03/13/2013 | CN202788806U Oil well liquid level depth on-line automatic monitoring device |
| 03/13/2013 | CN202788805U Underground deep hole detection device |
| 03/13/2013 | CN202788804U Laser calibration device for measuring angle difference of directional well project |
| 03/13/2013 | CN202788803U Locating detent retraction and release device of water consumption measuring and adjusting instrument of oil field hollow water injection well |
| 03/13/2013 | CN202788802U Minor diameter omni-directional bent flexible sub |
| 03/13/2013 | CN202788801U Indicator diagram testing system of three-cylinder reciprocating-type drill pump |
| 03/13/2013 | CN202788800U Pressure water adding device of oil gauging separator |
| 03/13/2013 | CN202788799U Electronic circuit of dual laterolog equipment |
| 03/13/2013 | CN202788798U Underground pulse neutron generator |
| 03/13/2013 | CN202788797U Inhomogeneous clastic rock horizontal well physical model |
| 03/13/2013 | CN202788796U Shut-in well safety alarm protection instrument |
| 03/13/2013 | CN202788795U Resistance-type relative flow sensor and connection circuits |
| 03/13/2013 | CN202788783U Top portion air injection gravity auxiliary drive oil extraction two dimension physical simulation experiment system |
| 03/13/2013 | CN202788751U Optical fiber transmission pressure-measurable downhole casing valve |
| 03/13/2013 | CN202788700U Motor-driven coiled tubing downhole tractor |
| 03/13/2013 | CN202788698U Wellhead catcher for downhole testers |
| 03/13/2013 | CN202788656U Underground-mine prospecting and well-logging centralizer |
| 03/13/2013 | CN202788638U Cased hole completion multistage cracking horizontal well multistage segmentation release water exploration pipe column |
| 03/13/2013 | CN202788601U Drilling construction detection device |
| 03/13/2013 | CN202785463U Underground electric jack working through cable conductor and reinforcing by means of fluid pressure |
| 03/13/2013 | CN102966348A Device and method for measurement while drilling of direction resistivity by using non-full circle antennas |
| 03/13/2013 | CN102966347A Subsea electronics modules |
| 03/13/2013 | CN102966346A Wireless low-power-consumption oil well indicator based on Zigbee network |
| 03/13/2013 | CN102966345A Simulation well system for testing electromagnetic wave resistivity logging instrument |
| 03/13/2013 | CN102966344A Shaft bottom air current uplift parameter detection device for coal bed gas exhaust and recovery shaft |
| 03/13/2013 | CN102966343A Neutron porosity measurement devices with semiconductor neutron detection cells and methods |
| 03/13/2013 | CN102966338A Single well water production and injection process system capable of measuring flow rate and pressure |
| 03/13/2013 | CN102966334A Electric submersible pump system |
| 03/13/2013 | CN102966314A Horizontal well central pipe and water control method thereof |
| 03/13/2013 | CN102373923B Reservoir stratum identification method |
| 03/13/2013 | CN102080536B Test method and device of working fluid level of oil well |
| 03/13/2013 | CN102022109B Communication line routing device of subsurface equipment |
| 03/13/2013 | CN101881153B Conventional logging information fusion visualization method and system thereof |
| 03/13/2013 | CN101798918B Method for determining relative spatial position of adjacent well parallel segment |
| 03/13/2013 | CN101761334B Logging telemetry communication device |
| 03/13/2013 | CN101680296B Apparatus, system, and method for determining injected fluid vertical placement |
| 03/13/2013 | CN101473104B Fluid diversion measurement methods and systems |
| 03/12/2013 | US8396667 Method and apparatus for testing swellable materials |
| 03/12/2013 | US8393414 Establishing positions of locating field detectors and path mapping in underground boring tool applications |
| 03/12/2013 | US8393413 Closed loop control bore hole drilling system |
| 03/12/2013 | US8393412 System and method for accurate wellbore placement |
| 03/12/2013 | US8393411 Method for controlling loss of drilling fluid |
| 03/12/2013 | CA2590655C Method and device for fluid flow parameters determination |
| 03/12/2013 | CA2516445C Load-resistant coaxial transmission line |
| 03/07/2013 | WO2013033547A1 Sample capture prioritization |
| 03/07/2013 | WO2013033183A2 Drilling dynamics data visualization in real time |
| 03/07/2013 | WO2013033138A2 Downhole pressure compensator and method of same |
| 03/07/2013 | WO2013032861A1 System and method for stick-slip correction |
| 03/07/2013 | WO2013032652A1 Minimum strain energy waypoint-following controller for directional drilling using optimized geometric hermite curves |
| 03/07/2013 | WO2013032445A1 Methods and systems for evaluating environmental impact of drilling operations |
| 03/07/2013 | WO2013008195A3 System and method for performing wellbore stimulation operations |
| 03/07/2013 | WO2012170987A3 Method for cost effective sampling and characterization of heterogeneous unconventional hydrocarbon regions |
| 03/07/2013 | WO2012074854A9 Remotely accessible subsea strain sensor assemblies and methods |
| 03/07/2013 | WO2012065118A3 System and method for remote sensing |
| 03/07/2013 | US20130056273 Method of drilling a subterranean borehole |
| 03/07/2013 | US20130056272 Proximity detection system for deep wells |
| 03/07/2013 | US20130056218 Riserless single trip hanger and packoff running tool |
| 03/07/2013 | US20130056202 Optical Casing Collar Locator Systems and Methods |
| 03/07/2013 | US20130056201 Method for evaluating hydrocarbon-containing subterrean formations penetrated by a directional wellbore |
| 03/07/2013 | US20130056200 Hydraulic Deployment Of A Well Isolation Mechanism |
| 03/07/2013 | US20130056198 Enhanced geothermal systems and reservoir optimization |
| 03/07/2013 | US20130056197 Optical casing collar locator systems and methods |
| 03/07/2013 | CA2845671A1 Determining perforation orientation |
| 03/07/2013 | CA2788889A1 Multiple control line assembly for downhole equipment |
| 03/07/2013 | CA2788230A1 Apparatus and method for measuring the acoustic impedance of wellbore fluids |
| 03/06/2013 | EP2565374A1 Downhole pressure compensator and method of same |
| 03/06/2013 | EP2565373A2 Emergency disconnect sequence video sharing |
| 03/06/2013 | EP2565370A1 Subsea pipe monitoring system |
| 03/06/2013 | EP2564025A2 System and method for managing use of a downhole asset |
| 03/06/2013 | EP2564024A2 Systems and methods for using wireless tags with downhole equipment |
| 03/06/2013 | EP2564023A1 Downhole actuator apparatus having a chemically activated trigger |
| 03/06/2013 | EP2564022A2 At-bit evaluation of formation parameters and drilling parameters |
| 03/06/2013 | EP2564021A1 Measurement of isotope ratios in complex matrices |
| 03/06/2013 | EP2564018A1 Liner hanger fluid diverter tool and related methods |
| 03/06/2013 | EP2564013A2 Drilling or extraction pipe string |
| 03/06/2013 | EP2564012A2 Pdc sensing element fabrication process and tool |
| 03/06/2013 | EP2563874A1 Use of halogenated benzoic acids for labelling injection water |
| 03/06/2013 | CN202767976U Well leakage speed measuring device for drilling |
| 03/06/2013 | CN202767975U Carbon-dioxide gas pulse generation device |
| 03/06/2013 | CN202767974U Dynamically tuned gyro continuous inclinometer |
| 03/06/2013 | CN202767973U Safety protector for replacing pressure gage bumper |
| 03/06/2013 | CN202767972U Novel well-logging bridle directly connected with torpedo |
| 03/06/2013 | CN202767971U Bidirectional extractor |
| 03/06/2013 | CN202767970U Special flow meter for coal bed gas well |
| 03/06/2013 | CN202767969U Stratum water filling monitor |
| 03/06/2013 | CN202767968U Three dimensional array induction calibration apparatus |
| 03/06/2013 | CN202767966U Staged fracturing experiment simulating shaft |
| 03/06/2013 | CN202767949U Wax removal through thermal wash monitoring system of oil well |
| 03/06/2013 | CN102953727A System and method for measuring subsurface gas pressure of coal mine |
| 03/06/2013 | CN102953726A Method and device for water drive oilfield advantage channel recognition |
| 03/06/2013 | CN102953725A Horizontal well logging dynamic lifting device |
| 03/06/2013 | CN102953724A Horizontal well logging anti-lift unlocking device |
| 03/06/2013 | CN102953723A Switching method and switching device for combined logging service cable core |
| 03/06/2013 | CN102953700A Putting and recovering extension cord device for electromagnetic wave measurement while drilling system |
| 03/06/2013 | CN102704922B Supercritical carbon dioxide carrying sand flow mechanism researching experiment device |
| 03/06/2013 | CN102606136B Logging-while-drilling value response law simulated experimental device |
| 03/06/2013 | CN102305315B Operating method for making cable pass through overlong continuous oil pipe |