| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 09/19/1990 | EP0387846A1 Power sources for downhole electrical heating |
| 09/18/1990 | US4958125 Method and apparatus for determining characteristics of the movement of a rotating drill string including rotation speed and lateral shocks |
| 09/18/1990 | US4957172 Surveying method for locating target subterranean bodies |
| 09/18/1990 | US4956921 Method to improve directional survey accuracy |
| 09/18/1990 | CA1274101A1 Determination of steam quality in thermal injection wells |
| 09/13/1990 | CA2011972A1 Device for steering a drill bit |
| 09/12/1990 | EP0387055A2 Gamma ray well logging for radial tracer distances |
| 09/12/1990 | EP0386810A2 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 09/11/1990 | US4956823 For transmitting pressure signals within a flowing liquid |
| 09/11/1990 | US4955439 Self-propelled subsoil penetrating tool system |
| 09/11/1990 | US4955438 Core drilling tool |
| 09/11/1990 | CA1273815A1 Method of observing bore holes, and apparatus therefor |
| 09/05/1990 | EP0385856A2 Method and apparatus for measuring wellbore diameter using electromagnetic waves |
| 09/05/1990 | CN2061605U Digital multi parameter tester for underground |
| 09/04/1990 | US4954998 Method for reducing noise in drill string signals |
| 09/04/1990 | US4953638 Method of and apparatus for drilling a horizontal controlled borehole in the earth |
| 09/04/1990 | US4953636 Electrical conductor arrangements for pipe system |
| 09/04/1990 | US4953616 Solenoid actuator and pulse drive |
| 09/04/1990 | US4953595 Mud pulse valve and method of valving in a mud flow for sharper rise and fall times, faster data pulse rates, and longer lifetime of the mud pulse valve |
| 09/03/1990 | CA2011390A1 Method and apparatus for measuring wellbore diameter using electromagnetic waves |
| 08/29/1990 | EP0384537A1 Method to improve directional survey accuracy |
| 08/28/1990 | US4953147 Measurement of corrosion with curved ultrasonic transducer, rule-based processing of full echo waveforms |
| 08/28/1990 | US4951758 Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method |
| 08/28/1990 | US4951748 Technique for electrically heating formations |
| 08/28/1990 | US4951700 Equipment for measuring the yield of oil wells |
| 08/27/1990 | CA2010943A1 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 08/21/1990 | US4950995 Method of treating a well bore in connection with electric logging of subsurface formation |
| 08/21/1990 | US4950892 Method and tool for gravel pack evaluation |
| 08/21/1990 | US4949795 Rotary rapid excavation system |
| 08/21/1990 | US4949575 For investigating properties of subsurface formations |
| 08/16/1990 | EP0381802A2 Wireline transmission method and apparatus |
| 08/14/1990 | US4948925 Apparatus and method for rotationally orienting a fluid conducting conduit |
| 08/14/1990 | US4947936 Well unit dynamometer installation means and method |
| 08/14/1990 | US4947683 Pulsed ultrasonic doppler borehole fluid measuring apparatus |
| 08/14/1990 | US4947682 Method of locating oil and gas horizons using a wellbore heat flow log |
| 08/14/1990 | CA1272683A1 Flapper type annulus pressure responsive tubing tester valve |
| 08/10/1990 | CA2009872A1 Steam injection survey apparatus and method for testing wells |
| 08/10/1990 | CA2009742A1 Variable speed pump control |
| 08/07/1990 | US4945775 Inertial based pipeline monitoring system |
| 08/07/1990 | US4945761 Method and device for transmitting data by cable and mud waves |
| 08/07/1990 | CA2009399A1 Wireline transmission method and apparatus |
| 08/02/1990 | WO1990008878A1 Tubing conveyed wellbore fluid flow measurement system |
| 08/02/1990 | CA2026317A1 Tubing conveyed wellbore fluid flow measurement system |
| 08/01/1990 | EP0379502A1 Multi-phase flowmeter. |
| 07/25/1990 | EP0379432A1 Method for the polychrome graphical representation of the depositional slope of geological layers |
| 07/24/1990 | WO1990008332A1 Method for reducing noise in drill string signals |
| 07/24/1990 | US4943210 Pump control system, level sensor switch and switch housing |
| 07/24/1990 | US4942926 Device and method for carrying out operations and/or manipulations in a well |
| 07/18/1990 | EP0250526B1 Soil displacement hammer |
| 07/17/1990 | US4942528 Dipmeter processing technique |
| 07/17/1990 | US4941951 Method for improving a drilling process by characterizing the hydraulics of the drilling system |
| 07/17/1990 | US4941350 Method and apparatus for formation testing |
| 07/17/1990 | US4941349 Coaxial coiled-tubing cable head |
| 07/11/1990 | EP0377378A1 Method and apparatus for the remote control of a drill string equipment by information sequences |
| 07/11/1990 | EP0377235A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 07/11/1990 | EP0377153A2 Boring ram |
| 07/10/1990 | CA1271539A1 Apparatus for detecting changes in inclination or acceleration |
| 07/04/1990 | EP0376811A1 Remote actuator with a nozzle-needle system |
| 07/04/1990 | EP0376795A1 Stress-measuring extensometer transducer for a drilling element |
| 07/04/1990 | EP0376580A2 Method for acoustically measuring wall thickness of tubular goods |
| 07/04/1990 | EP0376422A2 Method of cleaning well shafts |
| 07/03/1990 | US4939649 Method of correcting nonunimodality of dipmeter traces by uniquely transforming individual traces or intervals |
| 07/03/1990 | US4939362 Borehole fluid density well logging means and method |
| 07/03/1990 | US4939361 Method for correcting gamma ray spectra for borehole tracer interference |
| 07/03/1990 | US4938298 Directional well control |
| 07/03/1990 | US4938060 Downhole inspection system |
| 07/03/1990 | CA1271128A1 Borehole imaging apparatus |
| 06/30/1990 | CA2006938A1 Drill string equipment information sequence remote control method and device |
| 06/29/1990 | CA2006937A1 Extensometric sensor measuring the stress on a boring element and assembly for said sensor |
| 06/29/1990 | CA2005553A1 Method for acoustically measuring wall thickness of tubular goods |
| 06/27/1990 | EP0375100A1 Method and apparatus for logging deviated wells |
| 06/27/1990 | EP0374986A1 Monitoring drilling mud composition using flowing liquid junction electrodes |
| 06/27/1990 | EP0374985A1 Monitoring drilling mud composition using ion selective electrodes |
| 06/27/1990 | EP0374984A1 Process for predicting the performance quality of an oil bore hole cementation and evaluating this performance |
| 06/27/1990 | CN1043364A High-accuracy gradiometer for drilling |
| 06/26/1990 | US4936708 Apparatus for directing forward movement of a rod |
| 06/21/1990 | CA2002451A1 Monitoring drilling mud composition using flowing liquid junction electrodes |
| 06/21/1990 | CA2002450A1 Monitoring drilling mud composition using ion selective electrodes |
| 06/20/1990 | EP0374016A2 Inductively coupled connector for equipping surface well installations |
| 06/20/1990 | EP0373766A2 Subsea wellhead with annulus monitoring system |
| 06/20/1990 | EP0373205A1 Process and device for monitoring the advance of a drilling head in the ground |
| 06/20/1990 | CN2058426U Thermostat for high and long oil groove |
| 06/20/1990 | CN1043185A Method of determining depth of hydraulic fracuture zone in earth |
| 06/19/1990 | US4934458 Small diameter dual pump pollutant recovery system |
| 06/19/1990 | US4934186 For measuring variations of the fluid level depth within a well bore |
| 06/13/1990 | EP0373010A1 Pressure sensor usable in oil wells |
| 06/13/1990 | EP0372598A2 Impedance cross correlation logging tool |
| 06/12/1990 | US4933640 Apparatus for locating an elongated conductive body by electromagnetic measurement while drilling |
| 06/12/1990 | US4932471 Downhole tool, including shock absorber |
| 06/12/1990 | US4932253 Rod mounted load cell |
| 06/12/1990 | CA1270113A1 Method for determining formation dip |
| 06/06/1990 | EP0371906A2 Wellbore tool with hall effect coupling |
| 06/05/1990 | US4932005 Fluid means for data transmission |
| 06/05/1990 | US4930595 Method and apparatus for determining the profile of a subterranean passage |
| 06/05/1990 | US4930586 Hydraulic drilling apparatus and method |
| 06/05/1990 | CA1269924A1 Well tool having latching mechanism and method of utilizing the same |
| 06/03/1990 | CA2003785A1 Method and apparatus for determining a characteristic of the movement of a drill string |
| 06/03/1990 | CA2002584A1 Impedance cross correlation logging tool |
| 05/29/1990 | US4928776 Drilling assembly |
| 05/29/1990 | US4928764 Wireline tool cable head overload apparatus |