| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 10/23/1996 | CN2238316Y Subsurface separating low producing liquid water detector |
| 10/22/1996 | US5568448 System for transmitting a signal |
| 10/17/1996 | WO1996024745A3 Computer controlled downhole tools for production well control |
| 10/16/1996 | EP0737322A1 Method and apparatus for communicating signals from encased borehole |
| 10/15/1996 | US5565860 Underground information collecting apparatus having a noise cancel function |
| 10/15/1996 | US5565624 Method of determining variations in the morphology of a borehole |
| 10/15/1996 | US5564501 Control system with collection chamber |
| 10/15/1996 | US5564193 Method of correcting for axial and transverse error components in magnetometer readings during wellbore survey operations |
| 10/10/1996 | WO1996031679A1 A surface controlled wellbore directional steering tool |
| 10/09/1996 | EP0736666A2 Method and apparatus for determining the stress state and material properties |
| 10/09/1996 | CN2237115Y Water level measuring device in pump pipe |
| 10/09/1996 | CN2237114Y Connection head for down hole cable and well logging instrument |
| 10/09/1996 | CN1133087A Apparatus for testing shear thickening plugging fluid |
| 10/08/1996 | CA2045932C Method of and apparatus for detecting an influx into a well while drilling |
| 10/03/1996 | WO1996030623A1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 10/01/1996 | US5561245 Method for determining flow regime in multiphase fluid flow in a wellbore |
| 10/01/1996 | US5560437 Telemetry method for cable-drilled boreholes and method for carrying it out |
| 09/25/1996 | EP0733917A2 Measuring probe for hydrogeologie measurements |
| 09/25/1996 | EP0733780A1 Method and apparatus for locally measuring flow parameters of a multiphase fluid |
| 09/24/1996 | CA2054163C Receiving apparatus |
| 09/19/1996 | WO1996028636A1 High-rate multizone gravel pack system |
| 09/18/1996 | CN1131465A Improved slick line system with real-time surface display |
| 09/17/1996 | US5555945 For testing a zone of interest in subsurface formation intersected by a well |
| 09/12/1996 | WO1996027732A2 Shifting tool, releasing mechanism, position feedback method and method of releasing |
| 09/12/1996 | CA2188541A1 Overpull shifting tool |
| 09/11/1996 | EP0471858B1 System for detecting the position of an underground excavator |
| 09/10/1996 | US5555220 For recording a geophysical survey in a wellbore |
| 09/10/1996 | US5554804 For monitoring downhole pressure in a wellbore |
| 09/10/1996 | US5553678 Modulated bias units for steerable rotary drilling systems |
| 09/10/1996 | US5553677 Survey process for cable core borings and device for implementing it |
| 09/10/1996 | US5553671 Piston sub for isolating drilling fluids from hydraulic fluids |
| 09/10/1996 | US5553492 Measuring system for measuring real time groundwater data |
| 09/06/1996 | WO1996027068A1 Position detection devices |
| 09/06/1996 | CA2213849A1 Position detection devices |
| 09/04/1996 | EP0730083A2 Method and apparatus for use in setting barrier member in well |
| 09/04/1996 | CN2234503Y Sliding sleeve balance circular pressure controlled ball test valve |
| 09/04/1996 | CA2170711A1 Locator and setting tool and methods of use thereof |
| 09/03/1996 | US5553034 Differential pressure fluid density instrument |
| 09/03/1996 | US5552598 Determination of downhole flow regime in a horizontal wellbore by using center sample and fullbore gas-liquid holdup measurements |
| 09/03/1996 | US5551287 Borehole logging assembly |
| 08/29/1996 | WO1996026350A1 Casing with a laterally extendable tubular member and method for sand control in wells |
| 08/28/1996 | EP0728915A2 Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations |
| 08/28/1996 | EP0728909A2 Steerable rotary drilling system |
| 08/28/1996 | EP0728908A2 Steerable rotary drilling system |
| 08/28/1996 | EP0646214B1 Survey process for cable core borings and device for implementing it |
| 08/28/1996 | CN1032663C Analysis for well logging information |
| 08/27/1996 | US5550331 System and method of protecting instruments from down-hole fluids |
| 08/27/1996 | US5549163 Piston sleeve valve for use with oilfield fishing operations |
| 08/27/1996 | US5549161 Overpull shifting tool |
| 08/27/1996 | US5549160 Downhole progressing cavity pump rotor valve |
| 08/27/1996 | CA2081785C Dipmeter apparatus and method for investigating earth formations |
| 08/22/1996 | WO1996025584A1 Apparatus for determining the curvature of an elongated hole, such as a drill hole, in rock for instance |
| 08/22/1996 | CA2212749A1 Apparatus for determining the curvature of an elongated hole |
| 08/21/1996 | CN2233456Y Sealing-testing and pressure-measuring device for oil field water-flooding well |
| 08/20/1996 | US5548115 Probe device for detecting contaminants in subsurface media |
| 08/20/1996 | US5547029 For communication between the surface of a well and a downhole well tool |
| 08/20/1996 | US5547028 Downhole system for extending the life span of electronic components |
| 08/20/1996 | CA2089500C Method and apparatus for measuring steam density by neutron method |
| 08/15/1996 | WO1996024752A2 Method and appartus for remote control of wellbore end devices |
| 08/15/1996 | WO1996024751A1 An acoustic transmisson system |
| 08/15/1996 | WO1996024749A1 Method and apparatus for the remote control and monitoring of production wells |
| 08/15/1996 | WO1996024748A1 Production wells having permanent downhole formation evaluation sensors |
| 08/15/1996 | WO1996024747A1 Downhole production well control system and method |
| 08/15/1996 | WO1996024745A2 Computer controlled downhole tools for production well control |
| 08/15/1996 | CA2187423A1 An acoustic transmisson system |
| 08/13/1996 | US5546359 Method and transmitter/receiver for transferring signals through a medium in pipes and hoses |
| 08/08/1996 | WO1996023957A1 Method of monitoring fluids entering a wellbore |
| 08/07/1996 | EP0611413B1 Subsea well pressure monitor |
| 08/07/1996 | EP0601030B1 Process and device for measuring cable drilled bores |
| 08/06/1996 | US5544127 Borehole apparatus and methods for measuring formation velocities as a function of azimuth, and interpretation thereof |
| 08/06/1996 | US5543972 Mirror for producing a development picture of the wall of a borehole in the ground and device therefor |
| 08/06/1996 | US5543617 Method of measuring flow velocities using tracer techniques |
| 08/01/1996 | WO1996023368A1 Method and apparatus for communicating by means of an electrical power cable |
| 08/01/1996 | WO1996023127A1 Method and system for logging mechanical parameters of formations crossed through by a borehole |
| 08/01/1996 | WO1996023126A1 Borehole strainmeter |
| 08/01/1996 | CA2186402A1 Method and system for logging mechanical parameters of formations crossed through by a borehole |
| 07/30/1996 | US5541587 System for determining the true depth of an electrical logging tool within a wellbore |
| 07/30/1996 | US5541517 Method for drilling a borehole from one cased borehole to another cased borehole |
| 07/30/1996 | US5540282 Apparatus and method for completing/recompleting production wells |
| 07/30/1996 | US5540101 Borehole directional dilatometer |
| 07/30/1996 | US5540093 Method for optimizing the alignment of a horizontal borehole relative to the strike of rock-layer stress planes |
| 07/26/1996 | CA2141086A1 Rock extensometer |
| 07/24/1996 | EP0723067A2 Resistivity antenna shield, wear band and stabilizer assembly for measuring-while-drilling tool |
| 07/23/1996 | US5539375 Apparatus for transmitting instrumentation signals over power conductors |
| 07/23/1996 | US5537753 Bore hole inclinometer apparatus |
| 07/18/1996 | WO1996008635A3 Apparatus for the remote deployment of valves |
| 07/17/1996 | EP0722037A2 Apparatus for injecting fluid into a wellbore |
| 07/17/1996 | CN1126792A Compensation method for high-resolution sonic well logging and its sound series |
| 07/16/1996 | CA2026378C Liquid level detection |
| 07/11/1996 | WO1996021085A1 Downhole electricity transmission system |
| 07/10/1996 | EP0721053A1 Downhole electricity transmission system |
| 07/09/1996 | US5535177 For detecting pressure pulses communicated through drilling fluid |
| 07/09/1996 | US5533570 Apparatus for downhole injection and mixing of fluids into a cement slurry |
| 07/09/1996 | CA2123784C Pump-off control by integrating a portion of the area of a dynagraph |
| 07/03/1996 | CN2230350Y Pull-against type combined underground well-logging instrument |
| 07/02/1996 | US5531270 For controlling fluid flow in a well |
| 07/02/1996 | US5531112 Production logging tool for use in a tool string |
| 06/26/1996 | EP0718641A2 Drilling system with downhole apparatus for transforming multiple downhole sensor measurements into parameters of interest and for causing the drilling direction to change in response thereto |
| 06/26/1996 | EP0718465A1 Magnetic field producing cable for an underground excavator |
| 06/26/1996 | EP0717810A1 Method for detecting pressure measurement discontinuities caused by fluid boundary changes |