| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/24/1990 | EP0352148A1 Device and method for performing measurements or interventions in a borehole |
| 01/23/1990 | US4896303 Method for cementation evaluation using acoustical coupling and attenuation |
| 01/23/1990 | US4894923 Method and apparatus for measurement of azimuth of a borehole while drilling |
| 01/23/1990 | CA1264811A1 Well data transmission system using a magnetic drill string for transmitting data as a magnetic flux signal |
| 01/17/1990 | EP0350544A1 Blowout preventer testing apparatus |
| 01/16/1990 | US4893505 Subsurface formation testing apparatus |
| 01/16/1990 | US4893496 Torsional wave fluid sensor and system |
| 01/09/1990 | US4893286 System and method for preprocessing and transmitting echo waveform information |
| 01/09/1990 | US4893285 Method and apparatus for cement bond tool |
| 01/09/1990 | US4892149 Method of securing a tubular member within an annular well member, the combined well structure and the tool |
| 01/03/1990 | CN1038490A New method for stratified logging ecentric water-distributing well |
| 01/03/1990 | CN1038489A Method of using acoustic wave to evaluate cement-bond well quality in all its aspests |
| 01/02/1990 | US4891641 Method for transmitting data over logging cable |
| 01/02/1990 | US4890672 Method of controlling the flow of landfill gas from sanitary landfills and apparatus for performing the method |
| 12/27/1989 | EP0348098A2 Gamma ray well logging |
| 12/27/1989 | EP0348084A1 Data conversion circuit for well logging system |
| 12/20/1989 | CN2049676U Dual-purpose measurement ball bar for eccentric distribution well |
| 12/19/1989 | US4887672 Subsea wellhead with annulus communicating system |
| 12/14/1989 | DE3819818A1 Measuring method for surveying the ground in the zone in front of the face during underground driving of tunnel cross-sections |
| 12/06/1989 | EP0344412A1 Process and device for the continuous measuring of the relative height of a long object driven into the earth |
| 12/05/1989 | CA1263543A1 Flow basket |
| 11/29/1989 | EP0344060A2 Well tool control system and method |
| 11/28/1989 | US4884071 Wellbore tool with hall effect coupling |
| 11/23/1989 | EP0343140A2 Method and device for surveying the progression of a drilling head in the ground |
| 11/21/1989 | US4881598 Blow-out preventor test tool |
| 11/21/1989 | US4881406 Apparatus and method for taking measurements while drilling |
| 11/14/1989 | US4881083 Homing technique for an in-ground boring device |
| 11/14/1989 | US4880061 Tool for running structures in a well |
| 11/14/1989 | US4879896 Method and apparatus for leak testing of pipe |
| 11/14/1989 | CA1262970A1 Flow rate measurement |
| 11/08/1989 | EP0340956A1 Radioactive well logging method |
| 11/08/1989 | EP0340280A1 Self-propelled subsoil penetrating tool system |
| 11/07/1989 | US4879695 Method of locating a member in a borehole |
| 11/07/1989 | US4879463 Method and apparatus for subsurface formation evaluation |
| 11/07/1989 | US4878538 Perforate, test and sample tool and method of use |
| 11/02/1989 | WO1989010573A1 Stress wave telemetry system for drillstems and tubing strings |
| 11/02/1989 | WO1989010572A1 Acoustic data transmission through a drill string |
| 11/02/1989 | WO1989010464A1 Process and device for monitoring the advance of a drilling head in the ground |
| 11/02/1989 | EP0339825A1 Apparatus for data transmission in a borehole |
| 11/02/1989 | EP0339752A1 Pore pressure formation evaluation while drilling |
| 10/31/1989 | US4878206 Method and apparatus for filtering noise from data signals |
| 10/31/1989 | US4877956 Closed feedback injection system for radioactive materials using a high pressure radioactive slurry injector |
| 10/31/1989 | US4877089 Method and apparatus for coupling wireline tools to coil tubing |
| 10/25/1989 | EP0338367A2 Core-drilling tool |
| 10/24/1989 | US4876672 Ultrasonic logging tool with rotating exposed transducer |
| 10/24/1989 | US4876539 Parameter telemetering from the bottom of a deep borehole |
| 10/24/1989 | US4876450 Cryosonde for well logging tool |
| 10/24/1989 | US4876449 Injection with radioactive materials |
| 10/24/1989 | US4875369 Pressure sensor system |
| 10/24/1989 | US4875368 Pressure sensor system |
| 10/24/1989 | US4875292 Control system for earth boring tool |
| 10/24/1989 | CA1262483A1 Method and device for pumping a highly viscous liquid |
| 10/24/1989 | CA1262454A1 Deep-borehole drilling device |
| 10/18/1989 | CN2046152U Coupler of well logging torpedo |
| 10/17/1989 | US4875014 System and method for locating an underground probe having orthogonally oriented magnetometers |
| 10/17/1989 | US4874327 Universal cable head for a multiconductor logging cable |
| 10/17/1989 | US4874060 Device for receiving sound waves in a well |
| 10/10/1989 | US4873636 Interpretation of conical structures from dipmeter surveys |
| 10/10/1989 | US4873635 Pump-off control |
| 10/10/1989 | US4873522 Method for transmitting downhole data in a reduced time |
| 10/10/1989 | US4873488 Induction logging sonde with metallic support having a coaxial insulating sleeve member |
| 10/10/1989 | US4872509 Oil well production system using a hollow tube liner |
| 10/10/1989 | US4872507 Well bore apparatus arranged for operating in high-temperature wells as well as in low-temperature wells |
| 09/27/1989 | EP0333714A1 Pressure sensor system |
| 09/26/1989 | US4869591 Method of optically measuring relative angular movement |
| 09/26/1989 | US4869100 Variable orifice control means |
| 09/26/1989 | CA1261817A1 Earth drilling method and apparatus using multiple hydraulic forces |
| 09/26/1989 | CA1261816A1 Apparatus, especially for use underground, for remote transmission of information from a drill-hole |
| 09/26/1989 | CA1261647A1 Mini-well temperature profiling process |
| 09/26/1989 | CA1261485A1 Method of logging a well using a non-radioactive material irradiated into an isotope exhibiting a detectable characteristic |
| 09/26/1989 | CA1261456A1 Hydraulic pressure propulsed device for use in deviated well drilling |
| 09/26/1989 | CA1261424A1 Cement logging apparatus |
| 09/26/1989 | CA1261377A1 Pressure actuator switch |
| 09/26/1989 | CA1261176A1 Method of, and measuring tube and measuring probe for, measuring fluid pressure in a sealed bore hole |
| 09/26/1989 | CA1261174A2 Memory gauge for obtaining information in a well bore |
| 09/26/1989 | CA1259981A1 Pilot operated mud pulse valve and method of operating the same |
| 09/20/1989 | EP0332829A2 Device for measuring the yield of oil wells |
| 09/19/1989 | US4867264 Apparatus and method for investigating wellbores and the like |
| 09/19/1989 | US4867254 Method of controlling fluid influxes in hydrocarbon wells |
| 09/19/1989 | US4867237 Pressure monitoring apparatus |
| 09/19/1989 | CA1259685A1 Process and apparatus for monitoring and controlling the flammability of gas from an in-situ combustion oil recovery project |
| 09/19/1989 | CA1259502A1 Devices for imparting rotary motion |
| 09/12/1989 | US4866680 Method and apparatus for transmitting information in a borehole employing signal discrimination |
| 09/12/1989 | US4866607 Self-contained downhole gauge system |
| 09/12/1989 | US4866214 Service cable for a subsoil penetrating tool and method of preventing rotation of the cable when in use |
| 09/12/1989 | US4865128 Gravel packing system for a production radial tube |
| 09/12/1989 | CA1259213A1 Cable connector assembly |
| 09/12/1989 | CA1259203A1 Electro-optic high-temperature well bore modulator |
| 09/12/1989 | CA1259187A1 Method for determining the azimuth of a borehole |
| 09/05/1989 | US4864293 Inground boring technique including real time transducer |
| 09/05/1989 | US4864128 Method of introducing a radioactive substance into a well |
| 09/05/1989 | US4862960 Blowout preventer testing apparatus |
| 09/05/1989 | CA1259062A1 Method and apparatus for controlling the rotational torque of a drill bit |
| 08/30/1989 | EP0330558A1 Method and device for transmitting information by cable and by mud waves |
| 08/29/1989 | US4862426 Method and apparatus for operating equipment in a remote location |
| 08/29/1989 | US4862424 Interferometric means and method for accurate determination of fiberoptic well logging cable length |
| 08/29/1989 | US4862090 Measuring pad arrangement for a logging sonde |
| 08/29/1989 | US4862001 Radiant energy absorption steam quality monitoring means and method |
| 08/29/1989 | US4861986 Tracer injection method |
| 08/29/1989 | US4860836 Method and apparatus for indicating sample collection times during well drilling |