| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 04/15/1998 | CN1178862A Storing electronic pressure, seal detecting and flow complex tester |
| 04/14/1998 | US5740127 Pulse production and control in drill strings |
| 04/14/1998 | US5740126 Telemetry system for a bottomhole drilling assembly |
| 04/14/1998 | US5739431 Miniature magnetometer-accelerometer |
| 04/08/1998 | EP0834643A2 Method and apparatus for drilling and re-entering multiple lateral branches in a well |
| 04/07/1998 | US5736650 Venturi flow meter for measurement in a fluid flow passage |
| 04/07/1998 | US5736637 For evaluating multiphase flow of a fluid downhole in a borehole |
| 04/07/1998 | US5735357 Apparatus for and method of directional drilling |
| 04/07/1998 | US5735346 Fluid level sensing for artificial lift control systems |
| 04/01/1998 | EP0832345A2 Subsurface signal transmitting apparatus |
| 03/31/1998 | US5732776 Downhole production well control system and method |
| 03/26/1998 | WO1998012418A2 Autonomous downhole oilfield tool |
| 03/26/1998 | WO1998012417A1 Monitoring device and method |
| 03/26/1998 | WO1998006924A3 Combined electric-field telemetry and formation evaluation method and apparatus |
| 03/25/1998 | CN2276988Y On-line detector for length of oil pipe |
| 03/25/1998 | CN2276987Y Well logging instrument using oblique emission supersonic pulse reflection method |
| 03/24/1998 | US5731517 Measuring device used in a four-parameter measuring system and in a high temperature and high pressure condition |
| 03/24/1998 | US5730219 Production wells having permanent downhole formation evaluation sensors |
| 03/24/1998 | US5730218 Tool protection guide with energy absorbing bumper |
| 03/24/1998 | US5730217 Vacuum insulated converter for extending the life span of electronic components |
| 03/18/1998 | EP0829699A2 Method and system for measuring three-dimensional displacement |
| 03/10/1998 | US5725061 Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path |
| 03/10/1998 | US5725059 Method and apparatus for producing parallel boreholes |
| 03/10/1998 | US5725055 For use in a borehole in the earth |
| 03/05/1998 | WO1998009163A1 Method for verifying positive inflation of an inflatable element |
| 03/03/1998 | US5723781 Borehole tracer injection and detection method |
| 02/26/1998 | WO1998007958A1 Method and apparatus for providing a magnetic direction reference |
| 02/25/1998 | CN2275160Y Self sealed bridle |
| 02/25/1998 | CN2275159Y Connector for oil well measuring instrument |
| 02/24/1998 | US5721538 System and method of communicating between a plurality of completed zones in one or more production wells |
| 02/24/1998 | US5721376 Method and system for predicting the appearance of a dysfunctioning during drilling |
| 02/24/1998 | US5720355 Drill bit instrumentation and method for controlling drilling or core-drilling |
| 02/24/1998 | US5720354 Trenchless underground boring system with boring tool location |
| 02/24/1998 | US5720345 Casing joint detector |
| 02/24/1998 | US5720344 Method of longitudinally splitting a pipe coupling within a wellbore |
| 02/24/1998 | US5720342 Integrated converter for extending the life span of electronic components |
| 02/19/1998 | WO1998007049A2 Reservoir acquisition system with concentrator |
| 02/19/1998 | WO1998006931A1 A measuring system for measuring real time groundwater data |
| 02/19/1998 | WO1998006930A1 Borehole tracer injection and detection method |
| 02/19/1998 | WO1998006924A2 Combined electric-field telemetry and formation evaluation method and apparatus |
| 02/17/1998 | US5718287 For injecting fluid into a wellbore |
| 02/12/1998 | WO1998005848A2 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 02/12/1998 | WO1998005845A1 Method for forming a casing window |
| 02/12/1998 | CA2232941A1 Method for forming a casing window |
| 02/10/1998 | US5717169 Method and apparatus for inspecting well bore casing |
| 02/10/1998 | US5717131 Apparatus for testing a shear thickening plugging fluid |
| 02/10/1998 | US5715895 Downhole drilling tool cooling system |
| 02/10/1998 | US5715891 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 02/10/1998 | US5715890 Determing fluid levels in wells with flow induced pressure pulses |
| 02/04/1998 | CN2273770Y Bearing type slide-ring used for well survery hoist |
| 01/29/1998 | WO1998003767A1 Logging method |
| 01/29/1998 | WO1998003764A1 Underground warning system for underground conduits or pipes |
| 01/29/1998 | WO1997041330A3 Multi-lateral wellbore system and method for forming same |
| 01/27/1998 | US5711900 Gadolinium compounds for use as oil-soluble tracers |
| 01/27/1998 | CA2110060C Method and apparatus for determining path orientation of a passageway |
| 01/22/1998 | WO1998002638A1 Apparatus and method for performing imaging and downhole operations at work site in wellbores |
| 01/21/1998 | EP0819826A2 Apparatus for completing a subterranean well and methods of using same |
| 01/21/1998 | EP0819822A2 Apparatus for completing subterranean well and method of using same |
| 01/21/1998 | EP0819205A1 A surface controlled wellbore directional steering tool |
| 01/15/1998 | DE19627719A1 Downhole transmitter producing coded pressure pulse signals from measured data |
| 01/15/1998 | CA2209797A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/15/1998 | CA2208813A1 Apparatus for completing a subterranean well and associated methods of using same |
| 01/14/1998 | CN2272486Y Rotary action device for liquid level survey |
| 01/13/1998 | US5708203 Neutron logging method for quantitative wellbore fluid analysis |
| 01/13/1998 | US5706896 Method and apparatus for the remote control and monitoring of production wells |
| 01/13/1998 | US5706892 Downhole tools for production well control |
| 01/07/1998 | EP0816632A1 Apparatus and method for information transmission by electromagnetic waves |
| 01/07/1998 | EP0816631A2 Method for the determination of inflow of oil and/or gas into a well |
| 01/07/1998 | EP0816627A2 Underground drilling method |
| 01/07/1998 | EP0815347A1 Method for measuring of flow and flowmeter |
| 01/07/1998 | EP0815346A1 Flow meter |
| 01/07/1998 | EP0815345A1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 01/07/1998 | CN2272048Y Line protecting casing for overannular water detector |
| 01/07/1998 | CN1169503A Unattended monitoring system for beam-pumping unit group and data processing method thereof |
| 01/06/1998 | US5705812 Compaction monitoring instrument system |
| 01/06/1998 | CA2133124C Method for measuring the velocity of water flow through nested conduits |
| 12/31/1997 | WO1997049894A1 Method and apparatus for testing, completing and/or maintaining wellbores using a sensor device |
| 12/31/1997 | WO1997049889A1 A system for directional control of drilling |
| 12/31/1997 | CA2258236A1 A system for directional control of drilling |
| 12/30/1997 | US5703836 Acoustic transducer |
| 12/30/1997 | US5701751 Apparatus and method for actively cooling instrumentation in a high temperature environment |
| 12/29/1997 | EP0660902A4 Submersible well probe sleeve. |
| 12/24/1997 | WO1997048881A1 Integrated converter for extending the life span of electronic components |
| 12/18/1997 | WO1997047979A1 Miniature pendulum type accelerometer combined with ac driven magnetometer |
| 12/18/1997 | WO1997047978A1 Miniature pendulum type accelerometer combined with ac driven magnetometer |
| 12/17/1997 | EP0657006A4 Guided mole. |
| 12/17/1997 | CN1167871A Method and apparatus for measuring position of mud loss |
| 12/17/1997 | CN1167870A Method and apparatus for measuring position of cementing plug |
| 12/16/1997 | US5699246 Method to estimate a corrected response of a measurement apparatus relative to a set of known responses and observed measurements |
| 12/16/1997 | US5698981 Technique for establishing at least a portion of an underground path of a boring tool |
| 12/16/1997 | US5697445 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 12/11/1997 | WO1997046793A1 Wellhead pump control system |
| 12/11/1997 | WO1997046792A1 Pad production log tool |
| 12/11/1997 | DE19622910A1 Calibration instrument for slope measuring device |
| 12/11/1997 | CA2256604A1 Pad production log tool |
| 12/10/1997 | EP0811750A1 Method and device for downhole measurement of depth of borehole |
| 12/10/1997 | EP0811745A1 Steering device for a directional drilling tool |
| 12/10/1997 | EP0811107A1 Position detection devices |
| 12/10/1997 | CN1036683C Electric logging system |
| 12/09/1997 | US5695015 System and method of controlling rotation of a downhole instrument package |