| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/03/1987 | US4646565 Ultrasonic surface texture measurement apparatus and method |
| 03/03/1987 | CA1218740A1 Method and apparatus for borehole fluid influx detection |
| 02/24/1987 | US4646277 Control for guiding a boring tool |
| 02/24/1987 | US4646273 Method and apparatus for evaluating flow characteristics of fluid behind pipe |
| 02/24/1987 | US4646083 Borehole measurement and telemetry system |
| 02/24/1987 | US4644785 Hinged strain cell mounting apparatus |
| 02/24/1987 | CA1218294A1 Pump down tool and check valve |
| 02/24/1987 | CA1218268A1 Method and apparatus of thermal detection using bonded coupon |
| 02/17/1987 | US4643024 Method of, and measuring tube and measuring probe for, measuring fluid pressure in a sealed bore hole |
| 02/17/1987 | CA1218013A1 Method of and system for conducting a borehole gravimetry survey |
| 02/10/1987 | US4642800 Noise subtraction filter |
| 02/10/1987 | CA1217881A Gain stabilized natural gamma ray detection of casing thickness in a borehole |
| 02/10/1987 | CA1217850A Method and system of data transmission for a borehole logging tool |
| 02/10/1987 | CA1217838A Method and appartus for detecting well pump-off |
| 02/10/1987 | CA1217715A Method for determining oil saturation in a subsurface formation |
| 02/10/1987 | CA1217659A Method and apparatus for soil mechanics measurements of filter cakes |
| 02/04/1987 | EP0210826A2 Method of observing bore holes, and apparatus therefor |
| 02/03/1987 | US4641289 Process and device for transmitting information over a distance |
| 02/03/1987 | CA1217473A1 Method of and arrangement for positioning of a drilling apparatus |
| 02/03/1987 | CA1217472A1 Method and apparatus for controlling azimuthal drift of a drill bit |
| 01/27/1987 | USRE32336 Method and apparatus for conducting logging or perforating operations in a borehole |
| 01/27/1987 | US4639596 Petroleum reservoir flooding method |
| 01/27/1987 | CA1217231A1 Device for transmitting to the surface the signal from a transmitter located at a great depth |
| 01/21/1987 | EP0208770A1 Fluid means for data transmission. |
| 01/20/1987 | US4637480 Azimuth measuring method for non-vertical drilling |
| 01/20/1987 | US4637463 Echo ranging gun |
| 01/20/1987 | CA1216924A1 Measuring device for a seismic profile within a well- bore |
| 01/20/1987 | CA1216922A1 Finding distance to blowout using wellbore acoustic measurements |
| 01/13/1987 | US4636995 Mud pressure control system |
| 01/13/1987 | US4635718 Continuous obstruction monitor for well logging tools |
| 01/07/1987 | EP0207576A1 Apparatus for determining the positioning and measuring the depth, on which a construction or object is positioned in the ground |
| 01/07/1987 | EP0207128A1 Oil level sensor system and method for oil wells |
| 01/06/1987 | US4634860 Device for determining the position of a moving part and drilling machine including such a device |
| 01/06/1987 | US4633952 Multi-mode testing tool and method of use |
| 01/02/1987 | DE3531237C1 Sealed connection |
| 12/30/1986 | US4633248 Well logging instrument including shock isolation system |
| 12/30/1986 | US4632191 Steering system for percussion boring tools |
| 12/30/1986 | EP0206943A2 Fiber optic connector assembly |
| 12/30/1986 | EP0206917A1 Apparatus and method for the temporary protection of a workover or logging tool fastened to the end of a string |
| 12/24/1986 | CN85202621U Device for assaying drilling pressure |
| 12/23/1986 | US4631536 Multiplex submersible pump telemetry system |
| 12/23/1986 | US4630809 Vibration isolator and shock absorber device |
| 12/23/1986 | US4630676 Remotely controlled hydraulic cutter apparatus |
| 12/17/1986 | EP0204760A1 Method for remote registration of down hole parameters |
| 12/16/1986 | US4630244 Rotary acting shear valve for drilling fluid telemetry systems |
| 12/16/1986 | US4630243 Apparatus and method for logging wells while drilling |
| 12/16/1986 | US4629888 Well logging tool for hot well bores |
| 12/16/1986 | US4628995 Gauge carrier |
| 12/16/1986 | US4628725 Apparatus and method for analyzing a fluid that includes a liquid phase, contained in a tubular conduit |
| 12/16/1986 | CA1215246A1 Borehole gradiometer |
| 12/10/1986 | EP0203978A1 Process and system for monitoring wheel-type boring machines. |
| 12/10/1986 | CN86201399U Gradiograph with flexible rod and double plates |
| 12/09/1986 | US4628495 Measuring while drilling apparatus mud pressure signal valve |
| 12/09/1986 | US4627492 Well tool having latching mechanism and method of utilizing the same |
| 12/09/1986 | CA1215118A1 Method and apparatus for the determination of kinetics of structure formation in a binder |
| 12/09/1986 | CA1215115A1 Device for automatically compensating the magnetism of drill rods |
| 12/02/1986 | US4625795 Geomechanical probe for a drilling well |
| 12/02/1986 | US4625573 Magnetic shielding and magnetically shielded borehole core drilling |
| 12/02/1986 | CA1214720A1 Method for determining borehole or cavity configuration through inert gas interface |
| 11/25/1986 | US4624309 Apparatus for monitoring a parameter in a well |
| 11/25/1986 | US4624130 Method for determining borehole or cavity configuration through inert gas interface |
| 11/25/1986 | CA1214541A1 Method and apparatus for the detection of fractures by means of ultrasonic echosounding |
| 11/20/1986 | EP0202013A2 Steering and control system for percussion boring tools |
| 11/12/1986 | EP0201297A2 Downhole memory gauge |
| 11/12/1986 | EP0201296A2 Method of controlling downhole logging tool |
| 11/12/1986 | EP0201295A2 Power-conserving self-contained downhole gauge system |
| 11/11/1986 | US4622635 Portable display and control terminal for wells |
| 11/11/1986 | US4622463 Two-pulse tracer ejection method for determining injection profiles in wells |
| 11/11/1986 | US4621698 Percussion boring tool |
| 11/05/1986 | EP0200535A2 Verification of a surface controlled subsurface actuating device |
| 11/05/1986 | CN85103582A Method and device for monitoring drilling |
| 11/04/1986 | US4621264 Method and apparatus for measuring water level in a well |
| 11/04/1986 | US4620439 Method for determining borehole or cavity configuration through inert gas interface |
| 11/04/1986 | CA1213666A1 Logging while drilling system signal recovery system |
| 10/29/1986 | EP0198985A1 Induction logging sonde with metallic support |
| 10/28/1986 | US4620189 For pumping a liquid |
| 10/22/1986 | EP0198764A1 Method and apparatus for displacing logging tools in deviated wells |
| 10/22/1986 | EP0198672A2 Well tool suspension cable head weak point |
| 10/21/1986 | US4618828 Insulating segment for a drill string electrode structure |
| 10/21/1986 | US4618314 Fluid injection apparatus and method used between a blowout preventer and a choke manifold |
| 10/21/1986 | US4618009 Reaming tool |
| 10/21/1986 | US4617994 Determining residual oil saturation by injecting CO2 and base generating reactant |
| 10/21/1986 | US4617960 Verification of a surface controlled subsurface actuating device |
| 10/21/1986 | CA1213030A1 Electronic noise filtering system |
| 10/14/1986 | US4616987 Internal bore impression tool |
| 10/14/1986 | US4616705 Mini-well temperature profiling process |
| 10/14/1986 | US4616702 Tool and combined tool support and casing section for use in transmitting data up a well |
| 10/08/1986 | EP0196829A2 Well tool |
| 10/08/1986 | EP0196559A1 Method and apparatus for the intermittent measurement of the flowability of a fluid |
| 10/07/1986 | US4615390 System to control the combining of two fluids |
| 10/01/1986 | CN86102218A Method and apparatus for displacing logging tools in deviated wells |
| 09/30/1986 | US4614250 Logging method and apparatus using a sonde equipped with measuring pads |
| 09/30/1986 | US4614233 Mechanically actuated downhole locking sub |
| 09/30/1986 | US4614040 Borehole survey system and method of determining the difference in borehole azimuth at successive points |
| 09/25/1986 | WO1986005543A1 Hydraulic power supply for use during well drilling operations |
| 09/24/1986 | EP0195559A1 Method and apparatus for installment of underground utilities |
| 09/24/1986 | EP0195100A1 Method and apparatus for data transmission between a transmission arranged in a borehole and a surface-mounted transceiver |
| 09/23/1986 | CA1211841A2 Borehole survey instrument |
| 09/17/1986 | EP0194792A2 Apparatus and method to communicate bidirectional information in a borehole |
| 09/17/1986 | EP0194493A1 Apparatus for measuring internal dimensions of a tube, particularly those of a well, and a suitable displacement-measuring method therefor |