E21B 47 - Survey of boreholes or wells

Patents for E21B 47 - Survey of boreholes or wells (31,352)
12/1997
12/09/1997	CA2090393C Method and apparatus for locating stratification in production fluid in a well
12/03/1997	EP0615573B1 Method and apparatus for determining the orientation of the axis of a borehole.
12/03/1997	CN2269463Y Four parameter testing instrument for high temperature and high pressure
12/02/1997	US5692576 Locating device for percussion boring machines
11/1997
11/27/1997	WO1997044567A1 Downhole tool
11/26/1997	EP0809098A1 A method and apparatus for optically discriminating between the phases of a three-phase fluid
11/26/1997	EP0808410A1 Apparatus for determining the curvature of an elongated hole, such as a drill hole, in rock for instance
11/26/1997	EP0708872A4 Method and apparatus for controlling the head of a drilling or core-drilling device
11/26/1997	CN1165956A Transducer for sonic logging-while-drilling
11/25/1997	US5691712 Multiple wellbore tool apparatus including a plurality of microprocessor implemented wellbore tools for operating a corresponding plurality of included wellbore tools and acoustic transducers in response to stimulus signals and acoustic signals
11/24/1997	CA2206017A1 Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path
11/21/1997	CA2205419A1 Replaceable consumable erosion detector
11/20/1997	WO1997043637A1 Process and devices for characterising ground water measurement points by distinguishing ground water from subterranean water accumulation
11/20/1997	CA2205153A1 Well logging apparatus and method
11/19/1997	EP0807831A2 Method and apparatus for acoustic determination of the length of a fluid conduit
11/19/1997	EP0807202A1 Method of monitoring fluids entering a wellbore
11/19/1997	EP0504413B1 Mirror for producing development image of wall of hole in ground and device for producing image
11/18/1997	US5689248 Methods for reducing power consumption in remote sensing applications
11/18/1997	CA2098676C Logging while drilling tools, systems, and methods capable of transmitting data at a plurality of different frequencies
11/18/1997	CA2030520C Vibration analysis drilling control device and process thereof
11/15/1997	CA2203309A1 Downhole multiphase flow sensor
11/13/1997	CA2203361A1 Method for acoustic determination of the length of a fluid conduit
11/12/1997	EP0806542A2 Steerable rotary drilling system
11/12/1997	EP0805959A1 Method for determination of flow rate in a fluid
11/06/1997	WO1997041330A2 Multi-lateral wellbore system and method for forming same
11/06/1997	WO1997032110A3 Downhole core sampling and testing apparatus
11/05/1997	EP0738366B1 Method of creating a borehole in an earth formation
11/04/1997	US5684693 Method for bit-stream data compression
10/1997
10/30/1997	DE19713754A1 Modular borehole measurement probe obviating collection and storage of specialised, expensive and inflexible probes
10/29/1997	EP0803073A1 Dipmeter processing technique
10/29/1997	CA2203446A1 Liquid level sensing for artificial lift control systems
10/28/1997	US5680906 Method for real time location of deep boreholes while drilling
10/28/1997	US5680899 Electronic wellhead apparatus for measuring properties of multiphase flow
10/25/1997	CA2201554A1 Tree test plug
10/23/1997	WO1997039220A1 Downhole tool
10/23/1997	WO1997039218A1 Downhole electrode for well guidance system
10/21/1997	US5679894 Apparatus and method for drilling boreholes
10/21/1997	US5679893 Determining the oil decline for an oil-producing reservoir
10/21/1997	US5678981 Method to control sucker rod pump
10/21/1997	US5678643 Acoustic logging while drilling tool to determine bed boundaries
10/21/1997	US5678630 Directional drilling apparatus
10/15/1997	EP0800614A1 Downhole electricity transmission system
10/14/1997	US5678239 Reducing particle size of naturally occurring radioactive material to match that of particulate drilling mud component, diluting to nullify radioactive nature
10/14/1997	US5677631 Coaxial two port waveguide flowline sensor
10/14/1997	US5676212 Downhole electrode for well guidance system
10/09/1997	WO1997037103A1 Method and system for monitoring a characteristic of an earth formation in a well
10/09/1997	WO1997037102A2 Downhole flow control devices
10/07/1997	US5675674 Optical fiber modulation and demodulation system
10/07/1997	US5675325 Using a drill string
10/07/1997	US5675088 Method and apparatus for automatic monitoring of tectonic stresses and quantitative forecast of shallow earthquakes
10/07/1997	CA2071874C Motorized swivel provided with a dynamometric measurement unit
10/02/1997	WO1997036084A1 Method of assaying downhole occurrences and conditions
09/1997
09/29/1997	CA2471867A1 Apparatus for the remote measurement of physical parameters
09/24/1997	EP0658253A4 System and method of protecting optical elements from down-hole fluids.
09/24/1997	CN2263197Y Guide apparatus of annular space test instrument for pumping well
09/23/1997	CA2172470A1 Method for removing borehole rugosity noise from well log data
09/23/1997	CA2133907C Downhole progressing cavity pump rotor valve
09/18/1997	WO1997034128A1 Method of submarine crustal survey
09/16/1997	US5667023 Method and apparatus for drilling and completing wells
09/14/1997	CA2196912A1 Method and device for determining a space position of the axis of a cased well
09/12/1997	WO1997033067A1 High pressure tree cap
09/11/1997	DE19621158C1 Apparatus for sampling ground water
09/10/1997	EP0793881A1 Communications protocol for well-logging digital telemetry system
09/10/1997	CN2262097Y High temperature oil pipe radiactive logging instrument
09/09/1997	US5666050 Downhole magnetic position sensor
09/07/1997	CA2196933A1 Multipurpose tool
09/07/1997	CA2171155A1 Underground fluid sampling apparatus
09/04/1997	WO1997032110A2 Downhole core sampling and testing apparatus
09/04/1997	DE19625720C1 Determining position accuracy of bore holes and slots in building base
09/03/1997	EP0793000A2 Method for correcting directional surveys
09/03/1997	EP0792999A2 Means for transmitting informations inside the drilling string of a drilling apparatus
09/03/1997	EP0792408A2 Downhole system for extending the life span of electronic components
09/03/1997	EP0792407A1 Single-wire guidance system for drilling boreholes
09/02/1997	US5663929 Drilling signal transmission method and system
09/02/1997	US5663758 Instrument probe having a back-lighted camera
09/02/1997	US5663559 Microscopy imaging of earth formations
09/02/1997	US5662165 Production wells having permanent downhole formation evaluation sensors
09/02/1997	CA2044623C Method for reducing noise in drill string signals
08/1997
08/28/1997	WO1997031379A1 Treatment of radioactive material
08/28/1997	CA2244186A1 Treatment of radioactive material
08/26/1997	US5661237 Method and apparatus for locally measuring flow parameters of a multiphase fluid
08/26/1997	US5661236 Pad production log tool
08/26/1997	US5660238 Switch actuator and flow restrictor pilot valve assembly for measurement while drilling tools
08/26/1997	CA2072139C Method for determining the rotational speed of a drill bit
08/21/1997	WO1997030269A1 Motor drive actuator for downhole flow control devices
08/20/1997	EP0789849A1 Method for representing the path of one or more boreholes in a spatial and temporal domain
08/19/1997	US5657826 Guidance system for drilling boreholes
08/19/1997	US5657547 Rate gyro wells survey system including nulling system
08/13/1997	EP0788578A1 2-stage underreamer
08/13/1997	EP0757746A4 Method for measuring formation fluids in drilling fluid
08/13/1997	EP0644979A4 Method and apparatus for inspecting subsurface environments.
08/07/1997	WO1997028464A1 Sonic data logging system
08/07/1997	WO1997028352A1 Small hole retrievable perforating system for use during extreme overbalanced perforating
08/07/1997	DE19622282C1 Surveying boreholes using radial water jet from drill string advanced and rotated in hole
08/06/1997	EP0787242A1 Method and system for operating a downhole tool
08/05/1997	US5654504 In a well
08/05/1997	US5654502 Automatic well test system and method of operating the same
07/1997
07/31/1997	WO1997027381A1 Determination of fluid influx or efflux
07/31/1997	CA2195698A1 Tool protective guide with energy absorbing bumper
07/30/1997	EP0786674A2 Apparatus and method for the suppression of microphonic noise in proportional counters for borehole logging-while-drilling

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