| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/21/2009 | CN201184195Y Core blocking monitoring alarm and internal barrel protecting device |
| 01/21/2009 | CN201184194Y Petroleum engineering logging drilling fluid temperature wireless sensing device |
| 01/21/2009 | CN201184193Y Petroleum engineering drilling fluid vertical, casing tube pressure wireless sensing device |
| 01/21/2009 | CN201184192Y Storage type electronic monometer |
| 01/21/2009 | CN201184191Y Orientation direct head capable of measuring direction of self-floating and dragging instrument |
| 01/21/2009 | CN201184190Y Bridle double-safety anti-drop apparatus |
| 01/21/2009 | CN201184189Y Network work showing instrument of oil pumping machine polished rod load and displacement |
| 01/21/2009 | CN201184188Y Graduated ring of array induction instrument |
| 01/21/2009 | CN201184187Y Fixed value pressure relief balanced system of well logging instrument |
| 01/21/2009 | CN201184186Y Snap ring of rubber centralizer |
| 01/21/2009 | CN201184185Y Electronic instrument framework |
| 01/21/2009 | CN201184184Y Apparatus for continuously and separately measuring oil gas and water of oil well |
| 01/21/2009 | CN201184178Y Down-hole instrument capable of automatically measuring and adjusting flow |
| 01/21/2009 | CN201184130Y Oil gas well overflow and leakage experimental apparatus |
| 01/21/2009 | CN201183729Y Novel winch lift system |
| 01/21/2009 | CN101351617A Magnetic beacon guidance system |
| 01/21/2009 | CN101351616A Wellbore intervention tool |
| 01/21/2009 | CN101349152A Acoustic transducers suitable for underground |
| 01/21/2009 | CN101349151A Three-stage graduation apparatus of electromagnetic wave logger |
| 01/21/2009 | CN100453991C Treating meter and signal measurement for semiconductive high-molecular material pressure and temp sensor |
| 01/20/2009 | US7480207 Filtering and detection of telemetry |
| 01/20/2009 | US7478672 Apparatus for controlling a pressure control assembly in a hazardous area |
| 01/20/2009 | US7478555 Technique and apparatus for use in well testing |
| 01/20/2009 | CA2546695C Method and system for transmitting signals through a metal tubular |
| 01/20/2009 | CA2462983C Methods and apparatus to control downhole tools |
| 01/15/2009 | WO2009009476A1 Shock absorption for a logging instrument |
| 01/15/2009 | WO2009009437A2 Detecting acoustic signals from a well system |
| 01/15/2009 | WO2009008862A1 Improved pulse signaling for downhole telemetry |
| 01/15/2009 | WO2009008764A1 Well jet device and the operation method thereof |
| 01/15/2009 | WO2009008731A1 Devices and methods for formation testing by measuring pressure in an isolated variable volume |
| 01/15/2009 | WO2009007504A1 Rock drill apparatus |
| 01/15/2009 | WO2008131218A3 System and method for crossflow detection and intervention in production wellbores |
| 01/15/2009 | WO2008079799A3 Method and system for automated choke control on a hydrocarbon producing well |
| 01/15/2009 | US20090016900 Well jet device and the operating method thereof |
| 01/15/2009 | US20090016160 Estimation of Multichannel Mud Characteristics |
| 01/15/2009 | US20090016159 Downhole tool and method |
| 01/15/2009 | US20090015261 Determining formation parameters using electromagnetic coupling components |
| 01/15/2009 | US20090014175 System and method for logging with wired drillpipe |
| 01/15/2009 | US20090014172 Apparatus and Methods for Drilling and Lining a Wellbore |
| 01/15/2009 | US20090014166 Shock absorption for a logging instrument |
| 01/15/2009 | US20090013775 Downhole tool sensor system and method |
| 01/15/2009 | US20090013774 Real-time management system for slickline/wireline |
| 01/15/2009 | CA2692557A1 Devices and methods for formation testing by measuring pressure in an isolated variable volume |
| 01/15/2009 | CA2691349A1 Rock drill apparatus |
| 01/14/2009 | EP2013447A1 Method for production metering of oil wells |
| 01/14/2009 | CN201180539Y Modulation transmitting and analyzing device for sound wave in oil well solid phase medium |
| 01/14/2009 | CN201180538Y Test device for down-hole drop ply position |
| 01/14/2009 | CN201180537Y Down-hole falling objects detection actuating mechanism |
| 01/14/2009 | CN201180536Y Electronic pressure gauge with ultra-high temperature, ultra-high pressure and long-term sealing outer cylinder |
| 01/14/2009 | CN201180535Y Direct-reading type down-hole stream temperature and stream pressure test device |
| 01/14/2009 | CN201180515Y Automatic continuous grouting apparatus for pulling out of hole in oil field well drilling |
| 01/14/2009 | CN201180513Y Multifunctional shaft mouth blowout apparatus |
| 01/14/2009 | CN101343997A Directional tool of horizontal long drill hole |
| 01/14/2009 | CN101343996A High-precision locator used for electromagnetic wave logging instrument calibrator or graduator |
| 01/14/2009 | CN100451680C High resolution ratio static natural potential well logging instrument and its measuring method |
| 01/13/2009 | US7477161 Bidirectional telemetry apparatus and methods for wellbore operations |
| 01/13/2009 | US7475741 Method and system for precise drilling guidance of twin wells |
| 01/13/2009 | US7475734 Downhole wet connect using piezoelectric contacts |
| 01/13/2009 | US7475732 Instrumentation for a downhole deployment valve |
| 01/13/2009 | US7475724 Method of determining a fluid inflow profile of wellbore |
| 01/13/2009 | US7475722 Method and apparatus for restraining tubular members during well servicing |
| 01/13/2009 | US7475593 High temperature near infrared for measurements and telemetry in well boreholes |
| 01/13/2009 | US7475486 Creep determination technique |
| 01/13/2009 | CA2540434C Well communication system |
| 01/13/2009 | CA2488302C Apparatus and method for acquiring information while drilling |
| 01/13/2009 | CA2479262C Deep resistivity transient method for mwd applications using asymptotic filtering |
| 01/13/2009 | CA2314801C Apparatus for measurement |
| 01/08/2009 | WO2009006524A2 Pressure interference testing for estimating hydraulic isolation |
| 01/08/2009 | WO2009004336A1 Inertial position indicator |
| 01/08/2009 | WO2009004166A1 3-d ultrasonic imaging probe for characterising an area of land around a bore hole |
| 01/08/2009 | WO2009003249A1 Method for controlling the intermittent operation mode of stripper oil wells |
| 01/08/2009 | US20090012741 Location Device with a Gravity Measuring Device |
| 01/08/2009 | US20090012711 Vertical seismic profiling method utilizing seismic communication and synchronization |
| 01/08/2009 | US20090012710 Device and Method of Measuring Depth and Azimuth |
| 01/08/2009 | US20090008083 Method and apparatus for wellbore fluid treatment |
| 01/08/2009 | US20090007652 Optical sensor for measuring downhole ingress of debris |
| 01/08/2009 | US20090007651 Pressure interference testing for estimating hydraulic isolation |
| 01/08/2009 | US20090007650 Method and Apparatus for Wellsite Verification of Properties of a Fluid |
| 01/08/2009 | CA2773565A1 Pressure interference testing for estimating hydraulic isolation |
| 01/07/2009 | EP1687898B1 Electrical signalling system |
| 01/07/2009 | CN201176874Y Downhole data collection and transmission device |
| 01/07/2009 | CN201176873Y Oilfield water injection well flow gauge |
| 01/07/2009 | CN201176872Y Down-hole parameter detector |
| 01/07/2009 | CN201176869Y Salvaging device |
| 01/07/2009 | CN101338668A Method and system for determining drilling fluids leakage and overflow |
| 01/07/2009 | CN101338667A Coal mine gas drainage bore hole depth measurement method and measurement unit |
| 01/07/2009 | CN101338666A Oilfield down-hole current-collecting type highly aqueous water oil two-phase flow measurement method based on electromagnetic method |
| 01/07/2009 | CN101338665A High-frequency electromagnetic wave sending machine |
| 01/07/2009 | CN101338664A Condensed gas flow quantity measuring systems |
| 01/07/2009 | CN101338658A Hermetic electric submersible pump production completion system capable of proceeding steel wire operation |
| 01/07/2009 | CN101338657A Hydraulically controlled underbalance downhole casing valve |
| 01/07/2009 | CN101338653A Well wall gripping element |
| 01/07/2009 | CN100449116C Methods, apparatus, and systems for obtaining formation information utilizing sensors attached to a casing in a wellbore |
| 01/07/2009 | CN100449115C Method for determining stratum diameter of well hole of projection hole finished well |
| 01/06/2009 | US7474221 Marking of pipe joints |
| 01/06/2009 | US7472761 Boring tool tracking fundamentally based on drill string length, pitch and roll |
| 01/06/2009 | US7472749 Drifting tubing |
| 01/06/2009 | CA2512651C Integrated drilling dynamics system and method of operating same |
| 01/06/2009 | CA2509562C Determining a borehole azimuth from tool face measurements |
| 01/06/2009 | CA2421593C Isolator bar for acoustic instruments used in downhole formations |