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