Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 47 - Survey of boreholes or wells
Patents for E21B 47 - Survey of boreholes or wells (31,352)
06/1996
06/26/1996CN2229970Y Radioactivity type instrument placed in well for measuring well
06/26/1996CN1125483A Electrical logging system
06/25/1996US5529133 Steerable drilling tool and system
06/21/1996CA2165501A1 Differential pressure fluid density instrument
06/19/1996EP0656127A4 Reduced diameter down-hole instrument cable.
06/18/1996US5528556 Combination well logging device
06/13/1996WO1996018118A1 Method for real time location of deep boreholes while drilling
06/13/1996CA2205445A1 Method for real time location of deep boreholes while drilling
06/12/1996EP0716319A2 Method and equipment for performing measurements under drilling for oil and gas
06/12/1996EP0558703B1 Downhole drilling data processing and interpreting device and method for implementing same
06/12/1996CN2228977Y Bidirectional location device for direct reading electronic manometer
06/12/1996CN2228976Y Direct reading electronic manometer carrier
06/12/1996CN1124319A Acoustic detector for oil well radio transmitted pressure and temp. parameters
06/11/1996US5525008 Oxidation of impurities
06/11/1996US5524709 Method for acoustically coupling sensors in a wellbore
06/06/1996WO1996008951A3 Downhole system
06/05/1996EP0715057A1 Lead pipe configuration for underground pipe laying
06/04/1996US5522461 Mill valve
06/04/1996US5522260 Method and apparatus for determining a depth correction for a logging tool in a well
05/1996
05/29/1996EP0713951A2 Method of drilling and completing wells
05/29/1996CN2228129Y Drilling water level measuring instrument
05/28/1996US5521592 Method and apparatus for transmitting information relating to the operation of a downhole electrical device
05/28/1996US5520246 Multi-mode cushioning an instrument suspended in a well
05/28/1996US5520245 Device to determine free point
05/23/1996WO1996015427A1 Method for determination of flow rate in a fluid
05/23/1996WO1996015350A1 Single-wire guidance system for drilling boreholes
05/23/1996WO1996001359A3 Logging or measurement while tripping
05/22/1996EP0712499A1 Improved slick line system with real-time surface display
05/21/1996US5519543 Optic system for a down hole camera assembly
05/21/1996US5518034 Flexible hose with a visibly deformable structure upon an internal failure within the hose
05/21/1996CA2063218C Stand-off compensated formation measurements apparatus and method
05/17/1996WO1996014491A1 Solenoid guide system for horizontal boreholes
05/17/1996CA2202460A1 Solenoid guide system for horizontal boreholes
05/17/1996CA2157838A1 Apparatus for locking wire line instrument to drill collar
05/15/1996CA2159168A1 Multi-mode cushioning an instrument suspended in a well
05/14/1996US5517464 Integrated modulator and turbine-generator for a measurement while drilling tool
05/14/1996US5515931 Single-wire guidance system for drilling boreholes
05/09/1996WO1996013648A1 2-stage underreamer
05/08/1996CN1031764C Method and apparatus for changing operation mode of underground tool
05/07/1996US5515336 MWD surface signal detector having bypass loop acoustic detection means
05/07/1996US5515039 Well tool for obtaining pressure data in a well bore
05/07/1996US5515038 Data transmission system
05/07/1996US5513710 Solenoid guide system for horizontal boreholes
05/07/1996US5513528 Logging while drilling method and apparatus for measuring standoff as a function of angular position within a borehole
05/02/1996WO1996012868A1 Method and system for operating a downhole tool
05/02/1996CA2203527A1 Method and system for operating a downhole tool
05/01/1996EP0709541A2 Locating device for a boring ram
05/01/1996EP0708872A1 Method and apparatus for controlling the head of a drilling or core-drilling device
05/01/1996EP0513296B1 Device for the assembly or disassembly of probes in process pipes, tanks, etc.
04/1996
04/30/1996US5512889 Downhole instruments for well operations
04/30/1996US5512830 Measurement of vector components of static field perturbations for borehole location
04/30/1996US5511429 Method and system for measuring three-dimensional displacement
04/25/1996WO1996012161A1 Method and apparatus for determining the thickness of a well bore casing
04/25/1996DE4437525A1 Examination of rock borehole
04/23/1996US5511037 Comprehensive method of processing measurement while drilling data from one or more sensors
04/23/1996US5509479 Subterranean remediation pump and process for use
04/23/1996US5509478 Method of determining the quality of steam for stimulating hydrocarbon production
04/23/1996US5509474 Temperature logging for flow outside casing of wells
04/23/1996US5509303 Controllable sensitivity differential pressure fluid density instrument
04/17/1996EP0706668A1 Instant acoustic logging method for well bores
04/16/1996US5507348 Apparatus for locking wire line instrument to drill collar
04/15/1996CA2160176A1 Production logging mechanism for across-the-borehole measurement
04/10/1996EP0705941A1 Membrane apparatus with inclined piezometer
04/10/1996EP0586428B1 Apparatus for measuring the profile of a moving object
04/09/1996US5506577 Synchronizer for pulse code modulation telemetry
04/09/1996US5505259 Measuring device and method in a hydrocarbon production well
04/04/1996WO1996010123A1 Surface controlled reservoir analysis and management system
04/04/1996DE19509135C1 Method of stope drilling for quarry blasting
04/03/1996CN2223779Y Instrument for remote detecting water leaks from mine
04/02/1996US5504479 Carrierless amplitude and phase modulation telementry for use in electric wireline well logging
04/02/1996US5503473 Automatic cementing system for precisely obtaining a desired cement density
04/02/1996US5503013 Downhole memory gauge protection system
04/02/1996CA2089316C System for monitoring oil well performance
03/1996
03/28/1996WO1996009561A1 Apparatus for sensor location
03/28/1996WO1996009461A1 Apparatus for sensor installation in wells
03/28/1996WO1996008951A2 Downhole system
03/27/1996EP0703349A1 Method and apparatus for logging non-circular boreholes
03/27/1996EP0702799A1 Electrical logging system
03/26/1996US5501285 Method for controlling the head of a drilling or core-drilling device and apparatus for carrying out this method
03/21/1996WO1996008635A2 Apparatus for the remote deployment of valves
03/19/1996US5499682 Method for setting a slotted face wellbore deviation assembly using a rectilinear setting tool
03/19/1996US5499533 For wells
03/13/1996EP0533771B1 Video logging cable
03/06/1996EP0699888A2 Determination of the diameter or wallthickness of wall elements
03/06/1996EP0699822A2 A well data telemetry system
03/06/1996EP0699821A1 Downhole pressure gauge and convertor
03/05/1996US5497321 Well logging method for determining fractional flow characteristics of earth formations
03/05/1996US5495755 Slick line system with real-time surface display
02/1996
02/27/1996US5495237 Measuring tool for collecting down hole information and metering valve for producing mud-pulse used in the same
02/27/1996US5495174 Method and apparatus for detecting boundary stratum and adjusting the direction of drilling to maintain the drill string within a bed of interest
02/27/1996US5494105 Method and related system for operating a downhole tool
02/21/1996EP0697501A2 Integrated well drilling and formation evaluation system
02/21/1996EP0697500A2 Method and apparatus for the evaluation of formation pressure
02/21/1996EP0697499A2 Apparatus for detecting an acoustic signal in drilling mud
02/21/1996EP0697498A2 Apparatus for detecting pressure pulses in a drilling fluid supply
02/21/1996EP0697497A1 Downhole joint locator
02/21/1996EP0623223A4 Method and apparatus for acoustic shear wave logging.
02/21/1996CN1117112A A combination well logging device
02/20/1996US5493626 Reduced diameter down-hole instrument electrical/optical fiber cable
02/20/1996US5493288 System for multidirectional information transmission between at least two units of a drilling assembly
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