| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 04/08/1986 | US4580926 Foundation level and orientation tool |
| 04/08/1986 | US4580444 Ultrasonic determination of component concentrations in multi-component fluids |
| 04/08/1986 | CA1202880A1 Measuring while drilling apparatus mud pressure signal valve |
| 04/08/1986 | CA1202879A1 Downhole tool and method using the same |
| 04/02/1986 | EP0176408A1 Method and measuring apparatus for the inspection of a borehole provided with a tube |
| 04/02/1986 | EP0176400A1 Method for quality evaluation of the cement around a bore hole tube |
| 04/01/1986 | US4580050 Behind casing water flow detection |
| 04/01/1986 | US4578991 For maintaining stress cycle control to prevent down-hole failure |
| 04/01/1986 | US4578871 For measuring the inclination and azimuth of a bore |
| 04/01/1986 | CA1202712A1 Universal interface method and apparatus for subsurface earth formation testing |
| 03/26/1986 | EP0175298A2 Borehole sensing tool with optical rotation sensor |
| 03/25/1986 | US4578675 Apparatus and method for logging wells while drilling |
| 03/25/1986 | US4578645 Borehole logging tool utilizing electromagnetic energy in the determination of dip of subsurface formations surrounding a borehole |
| 03/19/1986 | EP0174603A1 Azimuth-measuring method for inclined boreholes |
| 03/19/1986 | EP0174328A1 Measurement using electrical transducers |
| 03/18/1986 | US4576042 Flow basket |
| 03/18/1986 | EP0131628A4 Method and apparatus for leak testing of pipe. |
| 03/18/1986 | CA1202081A1 Optical communication system for drill hole logging |
| 03/11/1986 | US4575681 Insulating and electrode structure for a drill string |
| 03/11/1986 | US4575261 System for calculating formation temperatures |
| 03/11/1986 | US4575260 Thermal conductivity probe for fluid identification |
| 03/11/1986 | US4574883 Well tool stopping devices, systems and methods |
| 03/11/1986 | US4574880 For the metering/injection of tracer materials into fluids |
| 03/11/1986 | US4574485 Bore-insertable apparatus for stationary measurement of bore-width changes in geological formations |
| 03/11/1986 | CA1201797A1 Circuit for controlling the magnitude of amplification of signals produced by a borehole televiewer |
| 03/11/1986 | CA1201708A1 Full-bore drill stem testing apparatus with surface pressure readout |
| 03/04/1986 | US4574193 Method for logging fluid flow rate, water fraction, and/or salinity of water flowing into a well |
| 03/04/1986 | US4573805 Method for measuring temperature of a hydrocarbon stratum subjected to RF electromagnetic energy |
| 03/04/1986 | CA1201428A1 Method and means for transmitting data through a drill string in a borehole |
| 02/26/1986 | EP0172599A1 Borehole survey method and apparatus |
| 02/26/1986 | EP0172452A1 Apparatus for transmitting information from a well to the surface during drilling |
| 02/25/1986 | US4572322 Finding distance to blowout using wellbore acoustic measurements |
| 02/25/1986 | US4572304 Portable seabed penetration system |
| 02/25/1986 | US4572293 Method of placing magnetic markers on collarless cased wellbores |
| 02/25/1986 | US4571993 Cementing system including real time display |
| 02/25/1986 | US4571848 Apparatus for measuring the transverse profile of a drill hole in a geologic formation |
| 02/25/1986 | CA1201057A1 Tubing-conveyed external gauge carriers |
| 02/18/1986 | US4571693 Acoustic device for measuring fluid properties |
| 02/18/1986 | US4570718 Oil level sensor system and method for oil wells |
| 02/18/1986 | US4570709 Method and device for effecting, by means of specialized tools, such operations as measurements in highly inclined to the vertical or horizontal well portions |
| 02/18/1986 | US4570481 Instrument locking and port bundle carrier |
| 02/18/1986 | US4570480 Method and apparatus for determining formation pressure |
| 02/18/1986 | US4570353 For measuring the inclination and azimuth of a borehole |
| 02/11/1986 | US4570234 Oilfield monitor and recorder |
| 02/04/1986 | US4568933 Electronic well tools and multi-channel recorder |
| 02/04/1986 | US4568932 Method and apparatus for obtaining high resolution subsurface geophysical measurements |
| 02/04/1986 | US4567921 High temperature pressure sensing instrument and method |
| 02/04/1986 | US4567759 Method and apparatus for producing an image log of a wall of a borehole penetrating an earth formation |
| 01/28/1986 | US4566536 Method for operating an injection well in an in-situ combustion oil recovery using oxygen |
| 01/28/1986 | US4566535 Dual packer apparatus and method |
| 01/28/1986 | US4566317 Borehole flow meter |
| 01/28/1986 | CA1200020A1 Gamma ray spectral tool for borehole use |
| 01/28/1986 | CA1199864A1 Method and apparatus for monitoring the corrosive effects of well fluids |
| 01/21/1986 | USRE32070 Borehole apparatus for investigating subsurface earth formations including a plurality of pad members and means for regulating the bearing pressure thereof |
| 01/14/1986 | CA1199264A1 Process and system for detecting a native reservoir fluid in a well bore |
| 01/08/1986 | EP0167233A1 Flow rate measurement |
| 01/07/1986 | CA1199113A1 Surveying of a borehole |
| 01/07/1986 | CA1199089A1 Electronic well tools and multi-channel recorder |
| 01/03/1986 | WO1986000112A1 Collar assembly for telemetry |
| 01/02/1986 | EP0166411A1 Device and method for measuring the forces transmitted by a shaft, in particular to a drilling tool |
| 12/31/1985 | US4562560 Method and means for transmitting data through a drill string in a borehole |
| 12/31/1985 | US4562559 Borehole acoustic telemetry system with phase shifted signal |
| 12/31/1985 | US4562375 Piezoelectric transducer, notably for pressure measurement |
| 12/31/1985 | US4561300 Temperature logging while drilling |
| 12/31/1985 | US4561299 Apparatus for detecting changes in inclination or acceleration |
| 12/24/1985 | US4560934 Method of transporting a payload in a borehole |
| 12/24/1985 | US4559818 Thermal well-test method |
| 12/24/1985 | US4559809 Process of testing blow-out preventer without pulling the wear bushing |
| 12/24/1985 | US4559790 Apparatus for maintaining electronic equipment and the like at low temperatures in hot ambient environments |
| 12/24/1985 | US4559713 Azimuth determination for vector sensor tools |
| 12/24/1985 | US4559709 Apparatus for measuring the internal dimensions of a tube, notably in a well, and displacement measurement method applicable to such an apparatus |
| 12/19/1985 | WO1985005652A1 Borehole inertial guidance system |
| 12/18/1985 | EP0165154A1 Method and device for effecting by means of specialized tools such operations as measurements in well sections highly inclined to the vertical, or the horizontals |
| 12/17/1985 | US4558592 Apparatus for on-site assessment of the effectiveness of a treatment in the course of its application to a hydrocarbon well |
| 12/10/1985 | US4558219 For use in evaluating fluid flow rates |
| 12/04/1985 | EP0163516A2 High temperature pressure sensing instrument and method |
| 11/26/1985 | US4555489 Method for determining flow patterns in subterranean petroleum and mineral containing formations using organosulfur tracers |
| 11/26/1985 | US4555488 A formamide, acetamide, urea or thiourea |
| 11/26/1985 | US4554976 Test tool for subsea blowout preventer stack |
| 11/26/1985 | CA1197175A1 Method of determining the length change of a string of well production tubing |
| 11/19/1985 | US4553599 Control apparatus for oil well production string closing tool |
| 11/19/1985 | US4553591 Oil well drilling apparatus |
| 11/19/1985 | US4553428 Drill stem testing apparatus with multiple pressure sensing ports |
| 11/13/1985 | EP0160678A1 Improved drilling method and apparatus. |
| 11/12/1985 | US4553226 Systems, apparatus and methods for measuring while drilling |
| 11/12/1985 | CA1196494A1 Borehole survey instrument |
| 11/05/1985 | US4551823 Method and apparatus for acoustic cement bond logging |
| 11/05/1985 | US4550599 Apparatus for restraining electronic assemblies |
| 11/05/1985 | CA1196183A1 Angular rate and position transducer for borehole survey instrument |
| 10/30/1985 | EP0159838A2 Microwave electromagnetic borehole dipmeter |
| 10/30/1985 | EP0159314A1 Noise subtraction filter |
| 10/29/1985 | US4550392 Apparatus for well logging telemetry |
| 10/29/1985 | CA1195919A1 Apparatus and method to communicate information in a borehole |
| 10/29/1985 | CA1195838A1 Inclination instrument |
| 10/22/1985 | US4548280 Drill bit having a failure indicator |
| 10/22/1985 | US4548266 Method for isolating two aquifers in a single borehole |
| 10/22/1985 | US4548080 Simulating down-hole conditions in a drilled well |
| 10/22/1985 | CA1195683A2 Systems, apparatus and methods for measuring while drilling |
| 10/22/1985 | CA1195491A1 Core orientation instrument |
| 10/16/1985 | EP0158465A2 Multi-mode testing tool |