| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 07/28/1992 | US5134285 Formation density logging mwd apparatus |
| 07/28/1992 | US5133418 Directional drilling system with eccentric mounted motor and biaxial sensor and method |
| 07/28/1992 | US5133417 Angle sensor using thermal conductivity for a steerable boring tool |
| 07/23/1992 | DE4101348A1 Vorrichtung zur gewinnung einer ortsunabhaengigen und absoluten bezugsrichtung Apparatus for recovery of a ortsunabhaengigen absolute and relative direction |
| 07/22/1992 | CN1062950A Fracture detection logging tool |
| 07/21/1992 | US5132903 Dielectric measuring apparatus for determining oil and water mixtures in a well borehole |
| 07/21/1992 | US5132624 Method and apparatus for insulating electrical devices in a logging sonde using a fluorinated organic compound |
| 07/21/1992 | US5131477 Method and apparatus for preventing drilling of a new well into an existing well |
| 07/21/1992 | CA1305405C Pressure communicating fluid isolating interface |
| 07/15/1992 | EP0494775A2 Production property determination of subterranean formation |
| 07/15/1992 | EP0379502B1 Multi-phase flowmeter |
| 07/14/1992 | US5130951 Method for reducing noise effects in acoustic signals transmitted along a pipe structure |
| 07/14/1992 | US5130950 Ultrasonic measurement apparatus |
| 07/14/1992 | US5130949 Geopressure analysis system |
| 07/14/1992 | US5130706 Direct switching modulation for electromagnetic borehole telemetry |
| 07/14/1992 | US5130705 Downhole well data recorder and method |
| 07/10/1992 | CA2059048A1 Method for determining liquid recovery during a closed-chamber drill stem test |
| 07/09/1992 | WO1992011461A1 Device for remotely operating an assembly comprising a bean/needle system, and use thereof in a drill string |
| 07/09/1992 | WO1992011442A1 Determination of the relative position of measurement points |
| 07/09/1992 | WO1992008875A3 Well completion system |
| 07/07/1992 | US5128902 Electromechanical transducer for acoustic telemetry system |
| 07/07/1992 | US5128901 Acoustic data transmission through a drillstring |
| 07/07/1992 | US5128898 Method and apparatus for detecting orientation of downhole geophones |
| 07/07/1992 | US5128867 Method and apparatus for determining inclination angle of a borehole while drilling |
| 07/07/1992 | US5128866 Pore pressure prediction method |
| 07/07/1992 | CA1304833C Method and apparatus for subsurface formation evaluation |
| 07/01/1992 | EP0493096A2 Fracture detection logging tool and method for locating subsurface fractures |
| 07/01/1992 | EP0491841A1 Pore pressure prediction method |
| 06/30/1992 | US5126564 Apparatus for nuclear logging employing sub wall mounted nuclear source container and nuclear source mounting tool |
| 06/30/1992 | CA1304286C System for recovery of petroleum from petroleum impregnated media |
| 06/27/1992 | CA2058188A1 Fracture detection logging tool |
| 06/25/1992 | WO1992010732A1 Method and apparatus for measuring of leakage especially over wellhead valves and annular space sealings |
| 06/25/1992 | DE4041723A1 Verfahren und vorrichtung zur bestimmung der position eines messpunktes relativ zu einem bezugspunkt Method and apparatus for determining the position of a measuring point relative to a reference point |
| 06/24/1992 | CN2108172U Logging cable sealing device for eccentric wellhead |
| 06/23/1992 | US5124953 Acoustic data transmission method |
| 06/23/1992 | US5123492 Method and apparatus for inspecting subsurface environments |
| 06/23/1992 | CA1304163C Steam injection profiling |
| 06/23/1992 | CA1304073C Method and device for the transmission of information using cables and sludge waves |
| 06/17/1992 | DE4040805A1 Pump extracting ground water - has pressure sensor near water inlet linked to control mechanism |
| 06/16/1992 | US5121993 Triaxial thermopile array geo-heat-flow sensor |
| 06/16/1992 | CA1303720C Borehole televiewer mudcake monitor |
| 06/13/1992 | WO1992010642A1 Method for correcting magnetic measurements made to determe the azimuth of a well |
| 06/13/1992 | CA2076047A1 Method for correcting magnetic measurements made with a measuring devince in a well for azimuth determination |
| 06/11/1992 | WO1992009723A1 Device for the assembly or disassembly of probes in process pipes, tanks, etc. |
| 06/10/1992 | EP0489447A1 A method for the esimation of pore pressure within a subterranean formation |
| 06/10/1992 | CN2106889U Small-diameter linear driver |
| 06/09/1992 | US5121363 Fracture detection logging tool |
| 06/09/1992 | CA1303018C Vibration isolator and shock absorber device |
| 06/03/1992 | EP0488507A2 Water cut monitoring system |
| 06/02/1992 | US5119344 Generating pressure pulses in a drilling fluid |
| 06/02/1992 | US5117926 Method and system for controlling vibrations in borehole equipment |
| 06/02/1992 | US5117922 Isolator assembly for a pneumatic underground piercing tool |
| 06/02/1992 | US5117685 Apparatus for testing an oil well, and corresponding method |
| 06/02/1992 | CA1302117C Measuring drillstem loading and behavior |
| 05/30/1992 | CA2044420A1 Water cut monitoring means and method |
| 05/29/1992 | WO1992008875A2 Well completion system |
| 05/27/1992 | EP0486752A1 Directional drill string comprising a pipe with a shaft bearing |
| 05/27/1992 | EP0486750A2 Target-directed drilling rod |
| 05/27/1992 | CN1061459A Method of steam injection profiling with unstable radioactive isotopes |
| 05/26/1992 | US5117399 Data processing and display for echo sounding data |
| 05/26/1992 | US5117398 Well communication pulser |
| 05/26/1992 | US5115871 Method for the estimation of pore pressure within a subterranean formation |
| 05/23/1992 | WO1992009847A1 Pipeline pig and method of pipeline inspection |
| 05/23/1992 | CA2095625A1 Pipeline pig and method of pipeline inspection |
| 05/20/1992 | EP0485488A1 Total-field imaging probe. |
| 05/19/1992 | US5115415 Stepper motor driven negative pressure pulse generator |
| 05/19/1992 | US5113703 Tubing end locating apparatus for wellbores |
| 05/19/1992 | CA1301328C System for acquiring and recording signals from a set of sensors in well probes |
| 05/19/1992 | CA1301304C Method and apparatus for generating a video display from signals produced by borehole scanning |
| 05/19/1992 | CA1301302C Method and device for increasing the transmission coefficient to geological formations of the energy generated by a seismic source in a well |
| 05/19/1992 | CA1301301C Borehole imaging apparatus |
| 05/19/1992 | CA1301084C Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method |
| 05/14/1992 | DE4135708A1 Empfangsvorrichtung Receiving device |
| 05/13/1992 | EP0485261A1 Downhole acoustic transducer |
| 05/13/1992 | EP0485052A1 Boring head and method for directional drilling in the ground |
| 05/13/1992 | EP0484487A1 Method for measuring the azimuth of a drillhole |
| 05/13/1992 | EP0281582B1 System for sensing ions in aqueous solution |
| 05/13/1992 | CN2104295U Pressure gage hanging device in mine |
| 05/12/1992 | US5113379 Method and apparatus for communicating between spaced locations in a borehole |
| 05/12/1992 | US5113070 Temperature compensator for an optic fiber pressure transducer |
| 05/12/1992 | US5112126 Apparatuses and methods for making geophysical measurements useful in determining the deflection of the vertical |
| 05/12/1992 | US5111891 Boring head for a subsurface soil-boring apparatus |
| 05/12/1992 | US5111882 Use of tracers to monitor in situ miscibility of solvent in oil reservoirs during EOR |
| 05/12/1992 | US5111881 Method to control fracture orientation in underground formation |
| 05/12/1992 | US5111547 Method for forming precision liquid/vapor separating bristle assembly |
| 05/12/1992 | CA1300371C Well bore measurement tool |
| 05/09/1992 | CA2046417A1 Boring head for a subsurface soil-boring apparatus |
| 05/06/1992 | EP0484218A1 Work-over device for non eruptive deviated wells |
| 05/06/1992 | CN2103638U Well surveying pulley |
| 05/05/1992 | CA1300284C Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools |
| 05/05/1992 | CA1299998C Sinusoidal pressure pulse generator for measurement while drilling tool |
| 04/29/1992 | EP0482892A1 Apparatus for preventing separation of a down-hole motor from a drill string |
| 04/29/1992 | EP0295291B1 System for moving a set of instruments and measurements and/or interventions method in a well |
| 04/28/1992 | US5107938 Apparatus for detecting position of underground excavator |
| 04/28/1992 | US5107705 Video system and method for determining and monitoring the depth of a bottomhole assembly within a wellbore |
| 04/27/1992 | CA2053683A1 Apparatus for preventing separation of a down-hole motor from a drill string |
| 04/23/1992 | DE4029215A1 Accurate measurement of spatial angles, trajectories, contours etc. - uses sequential angle and/or velocity and/or position measuring w.r.t. unknown, but identical starting states |
| 04/22/1992 | EP0481141A1 Borehole fluid flow monitoring apparatus |
| 04/22/1992 | EP0481077A1 Device for measuring position of underground excavator |
| 04/21/1992 | US5107441 System for evaluating the flow performance characteristics of a device |