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)
11/1998
11/17/1998US5837893 Method for detecting pressure measurement discontinuities caused by fluid boundary changes
11/17/1998US5836353 Valve assembly for borehole telemetry in drilling fluid
11/12/1998WO1998050681A1 Wellbores utilizing fiber optic-based sensors and operating devices
11/12/1998WO1998050680A2 Monitoring of downhole parameters and tools utilizing fiber optics
11/12/1998WO1998050676A1 Shearable multi-gage blowout preventer test tool and method
11/12/1998WO1998050675A1 Multi-gage blowout preventer test tool and method
11/12/1998WO1998050673A1 Packer having sensors for downhole inflation monitoring
11/11/1998CN2296931Y Air pressure meter for water level of borehole
11/10/1998US5834710 Acoustic pulse gun assembly
11/10/1998US5833003 Apparatus for completing a subterranean well and associated methods of using same
11/04/1998CN1197881A Precise well depth logging method
11/03/1998US5831549 Telemetry system involving gigahertz transmission in a gas filled tubular waveguide
11/03/1998US5831177 Fluid driven siren flowmeter
11/03/1998US5831156 Downhole system for well control and operation
11/03/1998US5829530 Method of controlling the production cycle of a well
11/03/1998US5829520 Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device
10/1998
10/29/1998WO1998048145A1 Multizone production monitoring system
10/29/1998WO1998048140A1 Acoustic data link for downhole mwd system
10/29/1998CA2286758A1 Multizone production monitoring system
10/28/1998EP0873465A1 Trenchless underground boring system with boring tool location
10/28/1998CN2295851Y Watertight bidirectional quick-reaction connecting headstall for horse
10/27/1998US5828003 Composite coiled tubing apparatus and methods
10/27/1998US5827051 Regenerative hydraulic power transmission for down-hole pump
10/27/1998US5826659 In a method of producing gas from a gas and liquid
10/22/1998WO1998046854A1 Side pocket mandrel for a measuring instrument
10/21/1998EP0872626A2 Method and apparatus for locating indexing systems in a cased well and conducting multilateral branch operations
10/21/1998EP0757746B1 Method for measuring formation fluids in drilling fluid
10/21/1998CN2295046Y Underground carrying device for logging instrument
10/21/1998CN1196488A Elastic wave exploration tool for wells
10/15/1998WO1998045733A1 Near field electromagnetic proximity determination
10/15/1998WO1998045732A1 Pressure impulse telemetry apparatus and method
10/15/1998WO1998045731A1 High impact communication and control system
10/15/1998WO1998045575A1 Method and apparatus for the downhole compositional analysis of formation gases
10/15/1998WO1998045574A1 Downhole monitoring method and device
10/15/1998CA2577582A1 High impact communication and control system
10/14/1998EP0870900A1 Downhole monitoring method and device
10/14/1998EP0870196A1 Automatic well test system and method of operating the same
10/13/1998US5821414 Survey apparatus and methods for directional wellbore wireline surveying
10/13/1998US5819859 Apparatus and method for detecting an underground structure
10/13/1998US5819849 For use with an artificial lift system
10/13/1998US5819848 Flow responsive time delay pump motor cut-off logic
10/07/1998CN1195065A Method and apparatus for drilling and re-entering multiple lateral branches in well
10/06/1998US5818352 Well data telemetry system
10/06/1998US5817937 Combination drill motor with measurement-while-drilling electronic sensor assembly
10/06/1998US5816344 For use in a drill string for drilling a bore through a formation
10/01/1998WO1998042948A1 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production
09/1998
09/30/1998EP0866951A1 Differential pressure measurement systems for fluid streams
09/30/1998CN2292901Y Annular temp. monitor for thermal recovery well of viscous crude
09/29/1998US5815035 Demodulating circuit, demodulating apparatus, demodulating method, and modulating/demodulating system of acoustic signals
09/29/1998US5813480 Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations
09/23/1998EP0866213A2 A method and apparatus for acquiring data in a hydrocarbon well
09/23/1998EP0865613A1 Composite material structures having reduced signal attenuation
09/23/1998EP0865612A1 Use of acoustic emission in rock formation analysis
09/22/1998US5812493 Method of representing the trajectory of at least one borehole in a space-time domain
09/22/1998US5812068 Drilling system with downhole apparatus for determining parameters of interest and for adjusting drilling direction in response thereto
09/22/1998US5810080 Device for exploring an underground formation crossed by a horizontal well comprising several anchorable sondes
09/16/1998CN1193104A Self-jacking type sensor
09/15/1998US5809163 Method of characterizing texture heterogeneities of geological formations traversed by a borehole
09/15/1998US5808779 Optical fiber modulation and demodulation system
09/15/1998US5808192 Arrangement for acquiring downhole information
09/15/1998US5806612 Apparatus for the transmission of information in a drill string
09/15/1998US5806596 One-trip whipstock setting and squeezing method
09/15/1998US5806195 Of a well borehole
09/15/1998US5806194 Method for conducting moving or rolling check shot for correcting borehole azimuth surveys
09/11/1998WO1998039551A1 Spring loaded borehole instrument
09/10/1998DE19707530A1 Verfahren und Vorrichtung zur Gewinnung von geologischer Information A method and apparatus for obtaining geological information
09/09/1998EP0862683A1 Method of qualifying a borehole survey
09/09/1998EP0862682A2 Autonomous downhole oilfield tool
09/09/1998CN2290689Y Box type side flow blowout-proof pressure cap
09/08/1998US5804715 Hydrodynamic dampening system for the precise measurement of dynamic sediment pore water pressure
09/08/1998US5804714 Flow meter
09/08/1998US5804713 Apparatus for sensor installations in wells
09/08/1998US5803185 Steerable rotary drilling systems and method of operating such systems
09/08/1998US5803167 Computer controlled downhole tools for production well control
09/04/1998CA2231208A1 Apparatus for remote measurement of earth well in-bore and well-site conditions
09/03/1998WO1998038412A1 Method and device for obtaining geological information
09/02/1998EP0861364A2 Electronic compass
09/02/1998CN2289876Y Integral multiparameter remote transmission producing logging instrument
09/01/1998US5802011 Pressure signalling for fluidic media
09/01/1998US5801642 Device for exploring an underground formation crossed by a horizontal well comprising several sensors permanently coupled with the wall
09/01/1998US5799742 Core drilling latch assembly
09/01/1998US5799740 Directional boring head with blade assembly
09/01/1998US5799732 Small hole retrievable perforating system for use during extreme overbalanced perforating
08/1998
08/27/1998WO1998037301A1 Subsurface probe system for chemical and mineral exploration
08/27/1998WO1998037300A1 Bottomhole assembly and methods of use
08/27/1998WO1998022689A3 Whipstock
08/27/1998WO1998021444A3 Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch
08/27/1998CA2578726A1 Bottom hole assembly and methods of use
08/27/1998CA2253227A1 Subsurface probe system for chemical and mineral exploration
08/26/1998EP0702799B1 Electrical logging system
08/26/1998CN1191265A Holefinding apparatus having integrated sensors
08/25/1998US5798488 Drilling apparatus
08/19/1998CN2288267Y Automatic recorder for depth of falling well
08/18/1998US5795991 Drilling apparatus
08/18/1998US5795474 Method and apparatus for the separation of hazardous waste from groundwater
08/18/1998US5794720 Method of assaying downhole occurrences and conditions
08/18/1998US5794719 Ground boring apparatus
08/12/1998EP0857855A1 Downhole directional measurement system
08/12/1998EP0857853A2 Drill bit for horizontal directional drilling of rock formations
08/12/1998EP0857852A2 Method for horizontal directional drilling of rock formations
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