| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/25/2000 | WO2000029716A2 Azimuth control of hydraulic vertical fractures in unconsolidated and weakly cemented soils and sediments |
| 05/25/2000 | WO2000029713A2 Method and apparatus for connecting a lateral branch liner to a main well bore |
| 05/25/2000 | WO2000029707A2 Monitoring performance of downhole equipment |
| 05/25/2000 | WO2000004275A9 Downhole well corrosion monitoring apparatus and method |
| 05/25/2000 | CA2318035A1 Method for correcting well log data for effects of changes in instrument velocity (cable yo-yo) |
| 05/24/2000 | EP1002934A2 Drilling apparatus |
| 05/24/2000 | EP0753161B1 Acoustic sensor |
| 05/24/2000 | CN2379603Y Measuring mechanism of four-arm movement type diameter borehole survey instrument |
| 05/24/2000 | CN1052776C Dynamic method for monitoring and testing water-injection advanced direction of water-injection well |
| 05/23/2000 | US6065540 Composite coiled tubing apparatus and methods |
| 05/23/2000 | US6065538 Method of obtaining improved geophysical information about earth formations |
| 05/23/2000 | US6065535 Formation fracturing and gravel packing tool |
| 05/23/2000 | US6065219 Method and apparatus for determining the shape of an earth borehole and the motion of a tool within the borehole |
| 05/23/2000 | US6065218 Method and apparatus for logging non-circular boreholes |
| 05/23/2000 | CA2157824C Sonic well logging tool for radially scanning cementing conditions in cased wells |
| 05/20/2000 | CA2289783A1 Drilling apparatus |
| 05/17/2000 | CN2378535Y Downhole pulse neutron generator |
| 05/17/2000 | CN1253229A Underground pressure and temp sensors for electric pump immersible in oil |
| 05/13/2000 | CA2275820A1 Determining contact levels of fluids in an oil reservoir using a reservoir contact monitoring tool |
| 05/11/2000 | WO2000026502A1 Connector for an expandable tubing string |
| 05/10/2000 | EP0999347A1 Acoustic impulse gun |
| 05/10/2000 | EP0999346A2 Method and apparatus for detecting torsional vibration in a bottomhole assembly |
| 05/10/2000 | CN2377350Y Downhole formation perforation depth detecting instrument |
| 05/09/2000 | US6061000 Downhole data transmission |
| 05/09/2000 | US6058771 Determination of fluid influx or efflux |
| 05/03/2000 | EP0997609A1 Method and apparatus for compactness control of a filling |
| 05/03/2000 | EP0997608A2 A device to optimize the yield of oil wells |
| 05/03/2000 | CN1252118A Downhole monitoring method and device |
| 05/02/2000 | US6057784 Apparatus and system for making at-bit measurements while drilling |
| 05/02/2000 | US6057687 Two mode boring tool guiding system and method |
| 04/30/2000 | CA2270720A1 Dynamic orienting reference system for directional drilling |
| 04/27/2000 | DE19820483C1 Verfahren und Vorrichtung zur Erstellung gesteuerter Hausanschlüsse Method and apparatus for creating controlled house connections |
| 04/26/2000 | EP0995877A1 Apparatus and method for information transmission by electromagnetic waves |
| 04/26/2000 | EP0973992A4 Subsurface probe system for chemical and mineral exploration |
| 04/26/2000 | EP0767862B1 Well completion lubricator valve |
| 04/26/2000 | EP0658253B1 System and method of protecting optical elements from down-hole fluids |
| 04/26/2000 | CN2375766Y Phonoscope |
| 04/26/2000 | CN1251480A Method and system for transmitting information by electromagnetic wave |
| 04/26/2000 | CN1251408A Stratum pressure measuring device provided with penetrating probe and measuring method thereof |
| 04/25/2000 | US6055213 Subsurface well apparatus |
| 04/25/2000 | US6053245 Method for monitoring the setting of well cement |
| 04/19/2000 | EP0994238A2 Earth formation pressure measurement with penetrating probe |
| 04/19/2000 | EP0994237A2 Acoustic wave transmission system and method for transmitting an acoustic wave to a drilling metal tubular member |
| 04/18/2000 | US6050353 Subassembly electrical isolation connector for drill rod |
| 04/18/2000 | US6050350 Underground directional drilling steering tool |
| 04/18/2000 | US6050349 Hydraulic system for mud pulse generation |
| 04/18/2000 | US6050141 Method and apparatus for acoustic logging of fluid density and wet cement plugs in boreholes |
| 04/18/2000 | US6050131 Method for verifying positive inflation of an inflatable element |
| 04/13/2000 | WO2000000716A3 System and method for controlling fluid flows in oil or gas wells |
| 04/13/2000 | DE19855048C1 Borehole probe for geohydrology, e.g. for ground water flow measurement; has tracer fluid supplied to intermediate gap between packer and enclosing liquid pervious wall |
| 04/13/2000 | DE19846137A1 Bore hole measurement method for building site; involves inserting inclinometer fixed in end of drilling rod into hole as it is being drilled, and measuring inclination angle and direction of inclinometer as it is removed |
| 04/12/2000 | EP0991921A1 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using nmr sensing |
| 04/12/2000 | EP0991919A2 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using esr sensing |
| 04/12/2000 | EP0991845A1 Earth formation surveying device |
| 04/12/2000 | CN2373567Y Steam driven testing wellhead |
| 04/12/2000 | CN2373566Y Intelligent instrument for deep of well drilling |
| 04/12/2000 | CN2373565Y Diplog instrument without auxiliary gain |
| 04/12/2000 | CN1250133A Supersonic pulse reflecting method to measure the depth of perforation |
| 04/11/2000 | US6048175 Multi-well computerized control of fluid pumping |
| 04/11/2000 | US6047783 Systems, arrangements and associated methods for tracking and/or guiding an underground boring tool |
| 04/06/2000 | WO1999064712A8 Directional drilling system and apparatus |
| 04/05/2000 | CN2372449Y Quick compling perforation bridle |
| 04/05/2000 | CN2372448Y High-temp. high-pressure insulating nipple joint of petroleum logging instrument |
| 04/05/2000 | CN2372447Y Eight-arm telescoping ram of petroleum logging instrument |
| 04/05/2000 | CN1249392A Measurement of rock pressure using distance sensor in casing drilling |
| 04/05/2000 | CN1249391A Serial telemetry bus of downhole instruments for petroleum logging and its interface technique |
| 04/05/2000 | CN1051156C Method for wave-guide measuring water holdup of oil well |
| 04/04/2000 | US6046685 Redundant downhole production well control system and method |
| 04/04/2000 | US6046587 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using NMR sensing |
| 03/30/2000 | WO2000017488A1 Through-drill string conveyed logging system |
| 03/30/2000 | DE19945852A1 Device for monitoring ground water flow in bore wells; has optical system between camera unit and measurement zone located in tube |
| 03/29/2000 | EP0988440A1 Control and monitoring system for chemical treatment of an oilfield well |
| 03/29/2000 | EP0988093A1 A method and system for treating biodegradable waste material through aerobic degradation |
| 03/29/2000 | EP0861364A4 Electronic compass |
| 03/29/2000 | CN2371339Y Logging winch collector ring |
| 03/28/2000 | US6044326 Measuring borehole size |
| 03/28/2000 | US6041872 Disposable telemetry cable deployment system |
| 03/28/2000 | US6041861 Method to determine self-calibrated circumferential cased bond impedance |
| 03/28/2000 | US6041860 Apparatus and method for performing imaging and downhole operations at a work site in wellbores |
| 03/28/2000 | US6041856 Real-time pump optimization system |
| 03/28/2000 | US6041509 Method and device for determining a space position of the axis of a cased well |
| 03/23/2000 | WO2000016128A1 Method and apparatus for creating an image of an earth borehole or a well casing |
| 03/23/2000 | DE19838085A1 Groundwater pollution investigation or prospecting system for measuring concentrations, flow velocities and their direction, comprises optical fiber and laser with rotating beam system exciting marker |
| 03/22/2000 | EP0987574A2 Fiber optic riser cable assembly |
| 03/22/2000 | EP0987401A2 Drill string telemetry |
| 03/22/2000 | EP0870196B1 Automatic well test system and method of operating the same |
| 03/22/2000 | CN2370157Y Acquisition clamp for drilling stem vibration signal |
| 03/15/2000 | CN2368977Y Rotary wheel style downhole timing detaching/attaching device |
| 03/15/2000 | CA2281176A1 Fiber optic riser cable assembly |
| 03/14/2000 | US6038513 Method and apparatus for quick determination of the ellipticity of an earth borehole |
| 03/14/2000 | US6037585 Determination of radioactive scale distribution using gamma ray logging technique |
| 03/14/2000 | US6036860 Method and apparatus for the separation of hazardous waste from groundwater |
| 03/14/2000 | US6035951 System for tracking and/or guiding an underground boring tool |
| 03/14/2000 | US6035701 Method and system to locate leaks in subsurface containment structures using tracer gases |
| 03/14/2000 | CA2011437C Logging method and apparatus using a rotating sensor |
| 03/11/2000 | CA2246850A1 Flow responsive time delay pump motor cut-off logic |
| 03/09/2000 | WO2000013349A1 Drill string telemetry with insulator between receiver and transmitter |
| 03/09/2000 | WO2000012978A1 Seismic sensing and acoustic logging systems using optical fiber, transducers and sensors |
| 03/09/2000 | WO2000012824A1 Composite tubular and methods |
| 03/09/2000 | DE19839714A1 Position display arrangement for earth drilling device, having pulling device connected with marker which moves marker through diverting of pulling device synchronously with drilling instrument |