| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 09/27/1995 | EP0674096A1 Gas hold up tool for cased well boreholes |
| 09/26/1995 | US5452761 Synchronized digital stacking method and application to induction logging tools |
| 09/26/1995 | US5452518 Method of correcting for axial error components in magnetometer readings during wellbore survey operations |
| 09/20/1995 | EP0672819A2 Method and transmitter/receiver for transferring signals through a medium in pipes and hoses |
| 09/20/1995 | EP0672818A1 Modular measurement while drilling sensor assembly |
| 09/20/1995 | EP0672817A1 Gas impermeable static seal |
| 09/20/1995 | CN1108732A Portable low power-consumption intelligent instrument for metering and recording the pressure of oil well |
| 09/13/1995 | EP0671547A1 Ultrasonic measurement apparatus and method for boreholes |
| 09/13/1995 | EP0670951A1 Method for detecting relative position of bores. |
| 09/12/1995 | US5449046 Earth boring tool with continuous rotation impulsed steering |
| 09/12/1995 | US5448911 Method and apparatus for detecting impending sticking of a drillstring |
| 09/05/1995 | US5448227 Method of and apparatus for making near-bit measurements while drilling |
| 09/05/1995 | US5447207 Downhole tool |
| 09/05/1995 | US5447201 Well completion system |
| 08/31/1995 | WO1995023273A2 Whipstock apparatus and methods of use |
| 08/30/1995 | EP0526619B1 Method for automatically monitoring the vibrational condition of a drill string |
| 08/30/1995 | CN2206350Y Electric metal umbrella type flow collector |
| 08/23/1995 | EP0550521B1 Transmission of data in boreholes |
| 08/23/1995 | EP0546142B1 System for multidirectional information transmission between at least two units of a drilling assembly |
| 08/23/1995 | CN2205870Y Isotope releaser for petroleum logging |
| 08/22/1995 | US5444382 Position and orientation locator/monitor |
| 08/22/1995 | US5443129 Apparatus and method for orienting and setting a hydraulically-actuatable tool in a borehole |
| 08/17/1995 | WO1995019221A3 Automatic cementing system for precisely obtaining a desired cement density |
| 08/16/1995 | CN2205443Y Oil well testing instrument |
| 08/16/1995 | CN2205442Y Energy storage uniform pressure isotopic discharger |
| 08/16/1995 | CN2205441Y Multifunction micro computer weight indicator |
| 08/15/1995 | US5442173 Method and system for real-time monitoring of earth formation fracture movement |
| 08/15/1995 | US5441340 Method for controlling the density of a well fracturing slurry |
| 08/15/1995 | US5441110 System and method for monitoring fracture growth during hydraulic fracture treatment |
| 08/10/1995 | WO1995021390A1 Dipmeter processing technique |
| 08/08/1995 | US5440081 Applying down-hole well fluid repelling surfactant containing tricresyl phosphate to exterior surface of optical element to prevent fluid from adhering |
| 08/08/1995 | US5439064 System for controlled drilling of boreholes along planned profile |
| 08/02/1995 | CN2204332Y Well-logging neutron-tube with alpha particle detector |
| 08/01/1995 | US5437308 Device for remotely actuating equipment comprising a bean-needle system |
| 07/26/1995 | EP0558674B1 Pipeline pig and method of pipeline inspection |
| 07/25/1995 | US5435393 Procedure and production pipe for production of oil or gas from an oil or gas reservoir |
| 07/25/1995 | US5435392 Liner tie-back sleeve |
| 07/25/1995 | US5435069 Method for determining borehole direction |
| 07/20/1995 | WO1995019490A1 Method of creating a borehole in an earth formation |
| 07/20/1995 | WO1995019489A1 Method for wireline operation control in cased wells |
| 07/20/1995 | WO1995019221A2 Automatic cementing system for precisely obtaining a desired cement density |
| 07/19/1995 | EP0663511A2 Logging while drilling method and apparatus for measuring formation characteristics as a function of angular position within a borehole |
| 07/18/1995 | US5434507 Method and apparatus for electromagnetic logging with two dimensional antenna array |
| 07/14/1995 | CA2139963A1 Bore hole inclinometer apparatus |
| 07/12/1995 | CN2203357Y Wellhole slope determining apparatus |
| 07/11/1995 | US5432699 Motion compensation apparatus and method of gyroscopic instruments for determining heading of a borehole |
| 07/11/1995 | CA1336261C Device for measuring or intervening in a well, method using the device and use of the device |
| 07/05/1995 | EP0661412A1 Device and method for remote actuation of a downhole tool |
| 07/05/1995 | EP0660902A1 Submersible well probe sleeve |
| 07/04/1995 | US5430259 Measurement of stand-off distance and drilling fluid sound speed while drilling |
| 07/04/1995 | US5429190 Slick line casing and tubing joint locator apparatus and associated methods |
| 06/28/1995 | EP0465543B1 Method and apparatus for monitoring well fluid parameters |
| 06/27/1995 | CA2084501C Video logging system having remote power source |
| 06/25/1995 | CA2139007A1 Device and method for remotely actuating an equipment - application to a boring string |
| 06/22/1995 | WO1995016849A1 Downhole tool |
| 06/22/1995 | CA2559391A1 Downhole tool |
| 06/21/1995 | EP0658684A1 Means for measuring the depth of borehole logging tools |
| 06/21/1995 | EP0658253A1 System and method of protecting optical elements from down-hole fluids |
| 06/21/1995 | CN2201484Y Single shooting point slope level |
| 06/21/1995 | CA2116077A1 Rotatable wellhead equipment for logging through the annulus |
| 06/20/1995 | USRE34975 Ultrasonic measurement apparatus |
| 06/20/1995 | US5426368 Logging method and apparatus for investigating geometrical characteristics of a borehole and for investigating formation resistivity |
| 06/20/1995 | US5425419 Whipstock apparatus and methods of use |
| 06/14/1995 | EP0657622A2 Method and apparatus for investigating drill string stand-off and drilling fluid sound speed while drilling |
| 06/14/1995 | EP0657621A1 Method and system for measuring three-dimensional displacement |
| 06/14/1995 | EP0657006A1 Guided mole |
| 06/07/1995 | EP0656547A1 Method and appparatus for surveying and monitoring a hydrocarbon reservoir |
| 06/07/1995 | EP0656460A2 Method and device for monitoring subsurface reservoirs |
| 06/07/1995 | EP0656127A1 Reduced diameter down-hole instrument cable |
| 06/07/1995 | CN1028799C Mud physical parameter acquisition unit |
| 06/07/1995 | CN1028790C MWD alarm tracer transmitter |
| 06/07/1995 | CN1028789C MWD drilling directional angle measuring apparatus |
| 06/01/1995 | WO1995014845A1 Transducer arrangement |
| 05/30/1995 | US5419405 System for controlled drilling of boreholes along planned profile |
| 05/30/1995 | US5419395 Eccentric fluid displacement sleeve |
| 05/30/1995 | US5419188 Reeled tubing support for downhole equipment module |
| 05/30/1995 | CA2043693C Method of steam injection profiling with unstable radioactive isotopes |
| 05/24/1995 | EP0654687A2 A method of processing measurement while drilling data |
| 05/24/1995 | EP0654686A2 Method of correcting for axial error components in magnetometer readings during wellbore survey operations |
| 05/24/1995 | EP0654583A2 Eccentric fluid displacement sleeve |
| 05/24/1995 | CN2198386Y Earth layer measuring instrument |
| 05/18/1995 | WO1995013549A1 Surface seismic profile system and method using vertical sensor arrays |
| 05/17/1995 | EP0653647A2 Method of correcting for axial and transverse error components in magnometer readings during wellbore survey operations |
| 05/16/1995 | US5415037 Method and apparatus for monitoring downhole temperatures |
| 05/16/1995 | CA2037277C Method and apparatus for processing echo sounding data collected from boreholes in the earth |
| 05/13/1995 | CA2133036A1 Eccentric fluid displacement sleeve |
| 05/10/1995 | CN2196686Y Additional converter for digital logging instrument |
| 05/09/1995 | US5413179 System and method for monitoring fracture growth during hydraulic fracture treatment |
| 05/09/1995 | US5413174 Signal transmission through deflected well tubing |
| 05/09/1995 | US5413045 Detonation system |
| 05/09/1995 | CA1335515C Oil well level sensor |
| 05/03/1995 | EP0651132A2 Method for locating tubular joints in a well |
| 05/02/1995 | US5412568 Remote programming of a downhole tool |
| 05/02/1995 | US5411105 Drilling a well gas supply in the drilling liquid |
| 04/27/1995 | DE4337402A1 Probe for measuring pressure and temperature profiles |
| 04/26/1995 | EP0528010B1 Device for measuring drilling mast swivel movement |
| 04/25/1995 | US5410303 System for drilling deivated boreholes |
| 04/25/1995 | US5410152 Low-noise method for performing downhole well logging using gamma ray spectroscopy to measure radioactive tracer penetration |
| 04/25/1995 | US5409071 Method to cement a wellbore |
| 04/23/1995 | CA2133037A1 Comprehensive method of processing measurement while drilling data from one or more sensors |