Patents for E21B 47 - Survey of boreholes or wells (31,352)
04/1995
04/20/1995WO1995010764A1 Apparatus for testing a shear thickening plugging fluid
04/19/1995EP0506919B1 Motorized swivel provided with a dynamometric measurement unit
04/19/1995EP0481077B1 Device for measuring position of underground excavator
04/18/1995US5408325 Apparatus for measuring the profile of a moving object
04/18/1995CA1335283C Method and apparatus for producing pressure variations in a drilling fluid
04/13/1995WO1995009971A1 Methods and apparatus for making chemical concentration measurements in a sub-surface exploration probe
04/13/1995DE4343413C1 Means for measuring the depth of borehole logging tools
04/12/1995EP0647859A1 A combination well logging device
04/12/1995EP0647764A2 Well treating system with pressure readout at surface
04/11/1995US5406482 Method and apparatus for measuring pumping rod position and other aspects of a pumping system by use of an accelerometer
04/11/1995US5404948 Injection well flow measurement
04/11/1995US5404752 Method for measuring the velocity of water flow through nested conduits
04/11/1995CA1335214C Method of predicting the torque and drag in directional wells
04/08/1995CA2133800A1 Well treating system with pressure readout at surface
04/06/1995WO1995009296A1 Apparatus and method for the dynamic measurement of a drill string employed in drilling
04/06/1995WO1995009295A1 Tool for measuring the twist in a tubular member
04/05/1995EP0646697A1 Apparatus and method for measuring dimensions in a borehole
04/05/1995EP0646696A1 Motion compensation apparatus and method for determining heading of a borehole
04/05/1995EP0646214A1 Survey process for cable core borings and device for implementing it.
04/04/1995US5404010 Method of well logging in fractured subterranean formation
04/04/1995US5402677 Method of determining drillstring bottom hole assembly vibrations
04/04/1995CA1335097C Percussive mole boring device with electronic transmitter
03/1995
03/30/1995DE4333032A1 Arrangement for determining the position and orientation of a tunnel driving machine
03/29/1995EP0645520A1 A method of measuring the velocity of liquid flow
03/29/1995EP0644979A1 Method and apparatus for inspecting subsurface environments
03/29/1995CN2193426Y Hydraulic well test vehicle
03/28/1995US5402165 Dual lighting system and method for a video logging
03/22/1995EP0644398A1 Measurement of internal tube dimensions within a wellbore
03/22/1995EP0643898A1 Instrument probe having a back-lighted camera
03/21/1995US5398546 Determination of drill bit rate of penetration from surface measurements
03/21/1995US5398421 Method for connecting magnetic measurements performed in a well through a measuring device in order to determine the azimuth thereof
03/15/1995EP0643198A2 Video logging system having remote power source
03/15/1995EP0642624A1 Method and apparatus for determining depth of drill cuttings
03/14/1995US5397985 Method for the imaging of casing morphology by twice integrating magnetic flux density signals
03/14/1995US5397893 Method for analyzing formation data from a formation evaluation measurement-while-drilling logging tool
03/14/1995US5396966 Steering sub for flexible drilling
03/14/1995US5396805 Force sensor and sensing method using crystal rods and light signals
03/09/1995DE4429136A1 Multi-level packer system (MLPS) for obtaining groundwater samples as well as physical, chemical and geophysical measured values from exactly defined depths
03/07/1995US5396232 Transmitter device with two insulating couplings for use in a borehole
03/07/1995US5394950 Method of drilling multiple radial wells using multiple string downhole orientation
03/07/1995US5394941 Fracture oriented completion tool system
03/07/1995CA2035477C Dynamometric measuring device for boring rod
03/01/1995EP0640743A2 Load cells for sensing weight and torque on a drill bit while drilling a well bore
02/1995
02/28/1995US5394141 Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface
02/28/1995US5392867 Device for remotely operating and assembly comprising a bean/needle system, and use thereof in a drill string
02/22/1995EP0528013B1 Method of checking that an oil well safety valve is operating correctly
02/22/1995CN2190158Y Separator for mechanical underground pressure meter
02/21/1995US5390748 Method and apparatus for drilling optimum subterranean well boreholes
02/15/1995EP0638823A2 Ultrasonic stand-off gauge
02/15/1995EP0638792A1 Procedure and facility for leak testing of a cemented part of a pipe
02/15/1995EP0638163A1 Remotely deployable pressure sensor.
02/15/1995CN1098764A Storage-type underground data measuring and acquisition system
02/15/1995CN1098763A Carbon/oxygen energy spectrum logging system
02/14/1995US5390153 Measuring while drilling employing cascaded transmission systems
02/14/1995US5388455 Electromagnetic borehole flowmeter system
02/09/1995WO1995004290A1 Improved slick line system with real-time surface display
02/08/1995CN1098473A Secondary interface cementing quality determining method
02/08/1995CN1098472A Acoustic cement bond cementing quality logging method
02/08/1995CN1098471A Downhole telemetery system net of oil well
02/07/1995US5388044 Dipmeter processing technique
02/07/1995US5387907 High data rate wireline telemetry system
02/07/1995US5386875 Method for controlling sand production of relatively unconsolidated formations
02/07/1995US5386724 Load cells for sensing weight and torque on a drill bit while drilling a well bore
02/07/1995CA2083473C Method and apparatus for solution mining
02/07/1995CA2024704C Methods and apparatus for evaluating formation characteristics while drilling a borehole through earth formations
02/02/1995WO1995003472A1 Method and apparatus for controlling the head of a drilling or core-drilling device
02/01/1995EP0636763A2 Method and apparatus for electric/acoustic telemetry in a well
02/01/1995CN2188650Y Automatic monitoring instrument for cement surface
01/1995
01/31/1995US5385060 Device for the assembly or disassembly of probes in process pipes, tanks, etc.
01/31/1995US5385049 Pipeline pig and method of pipeline inspection
01/27/1995CA2127921A1 Method and apparatus for electric/acoustic telemetry
01/19/1995WO1995002111A1 Apparatus and method for determining mechanical integrity of wells
01/19/1995CA2166686A1 Apparatus and method for determining mechanical integrity of wells
01/13/1995EP0643898A4 Instrument probe having a back-lighted camera.
01/11/1995EP0633391A2 Sliding sleeve casing tool
01/11/1995EP0425569B1 A system and method for locating an underground probe
01/11/1995CN2187225Y Bank head device for well logging
01/11/1995CN1097234A Wave-guide measuring method for water-holding rate of oil well
01/10/1995US5379839 Well testing valve
01/04/1995CN2186797Y Combined well logging instrument
01/03/1995US5379216 Method and apparatus for producing a new output record medium illustrating a quantitative description in the volume dimension of mud filtrate invasion into permeable zones of a formation in a wellbore
01/03/1995US5377540 Oil and gas well logging system
12/1994
12/27/1994US5377161 Method of determining travel time in drill string
12/27/1994US5377104 Passive seismic imaging for real time management and verification of hydraulic fracturing and of geologic containment of hazardous wastes injected into hydraulic fractures
12/27/1994US5375478 For several separate testing points
12/27/1994US5375476 Stuck pipe locator system
12/27/1994US5375465 Method for gas/liquid well profiling
12/22/1994WO1994029754A1 Electrical logging system
12/22/1994WO1994029753A1 A method for identifying faults and unconformities in a geologic formation
12/22/1994WO1994029749A1 Method and apparatus for communicating signals from encased borehole
12/22/1994WO1994029572A1 Method and apparatus for communicating coded messages in a wellbore
12/22/1994DE4401941A1 Concealed chamber examining device connected to supply cable
12/22/1994CA2164726A1 Electrical logging system
12/22/1994CA2164342A1 Method and apparatus for communicating signals from encased borehole
12/20/1994US5375098 Logging while drilling tools, systems, and methods capable of transmitting data at a plurality of different frequencies
12/14/1994EP0498876B1 Method for determining the rotational speed of a drill bit
12/14/1994CN2185321Y Measuring polar plate rotary device for logging instrument
12/13/1994US5373481 Sonic vibration telemetering system
12/13/1994US5372482 Detection of rod pump fillage from motor power
12/13/1994US5372038 Probe to specifically determine the injectivity or productivity of a petroleum well and measuring method implementing said probe