| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 11/17/1998 | US5837893 Method for detecting pressure measurement discontinuities caused by fluid boundary changes |
| 11/17/1998 | US5836353 Valve assembly for borehole telemetry in drilling fluid |
| 11/12/1998 | WO1998050681A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 11/12/1998 | WO1998050680A2 Monitoring of downhole parameters and tools utilizing fiber optics |
| 11/12/1998 | WO1998050676A1 Shearable multi-gage blowout preventer test tool and method |
| 11/12/1998 | WO1998050675A1 Multi-gage blowout preventer test tool and method |
| 11/12/1998 | WO1998050673A1 Packer having sensors for downhole inflation monitoring |
| 11/11/1998 | CN2296931Y Air pressure meter for water level of borehole |
| 11/10/1998 | US5834710 Acoustic pulse gun assembly |
| 11/10/1998 | US5833003 Apparatus for completing a subterranean well and associated methods of using same |
| 11/04/1998 | CN1197881A Precise well depth logging method |
| 11/03/1998 | US5831549 Telemetry system involving gigahertz transmission in a gas filled tubular waveguide |
| 11/03/1998 | US5831177 Fluid driven siren flowmeter |
| 11/03/1998 | US5831156 Downhole system for well control and operation |
| 11/03/1998 | US5829530 Method of controlling the production cycle of a well |
| 11/03/1998 | US5829520 Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device |
| 10/29/1998 | WO1998048145A1 Multizone production monitoring system |
| 10/29/1998 | WO1998048140A1 Acoustic data link for downhole mwd system |
| 10/29/1998 | CA2286758A1 Multizone production monitoring system |
| 10/28/1998 | EP0873465A1 Trenchless underground boring system with boring tool location |
| 10/28/1998 | CN2295851Y Watertight bidirectional quick-reaction connecting headstall for horse |
| 10/27/1998 | US5828003 Composite coiled tubing apparatus and methods |
| 10/27/1998 | US5827051 Regenerative hydraulic power transmission for down-hole pump |
| 10/27/1998 | US5826659 In a method of producing gas from a gas and liquid |
| 10/22/1998 | WO1998046854A1 Side pocket mandrel for a measuring instrument |
| 10/21/1998 | EP0872626A2 Method and apparatus for locating indexing systems in a cased well and conducting multilateral branch operations |
| 10/21/1998 | EP0757746B1 Method for measuring formation fluids in drilling fluid |
| 10/21/1998 | CN2295046Y Underground carrying device for logging instrument |
| 10/21/1998 | CN1196488A Elastic wave exploration tool for wells |
| 10/15/1998 | WO1998045733A1 Near field electromagnetic proximity determination |
| 10/15/1998 | WO1998045732A1 Pressure impulse telemetry apparatus and method |
| 10/15/1998 | WO1998045731A1 High impact communication and control system |
| 10/15/1998 | WO1998045575A1 Method and apparatus for the downhole compositional analysis of formation gases |
| 10/15/1998 | WO1998045574A1 Downhole monitoring method and device |
| 10/15/1998 | CA2577582A1 High impact communication and control system |
| 10/14/1998 | EP0870900A1 Downhole monitoring method and device |
| 10/14/1998 | EP0870196A1 Automatic well test system and method of operating the same |
| 10/13/1998 | US5821414 Survey apparatus and methods for directional wellbore wireline surveying |
| 10/13/1998 | US5819859 Apparatus and method for detecting an underground structure |
| 10/13/1998 | US5819849 For use with an artificial lift system |
| 10/13/1998 | US5819848 Flow responsive time delay pump motor cut-off logic |
| 10/07/1998 | CN1195065A Method and apparatus for drilling and re-entering multiple lateral branches in well |
| 10/06/1998 | US5818352 Well data telemetry system |
| 10/06/1998 | US5817937 Combination drill motor with measurement-while-drilling electronic sensor assembly |
| 10/06/1998 | US5816344 For use in a drill string for drilling a bore through a formation |
| 10/01/1998 | WO1998042948A1 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 09/30/1998 | EP0866951A1 Differential pressure measurement systems for fluid streams |
| 09/30/1998 | CN2292901Y Annular temp. monitor for thermal recovery well of viscous crude |
| 09/29/1998 | US5815035 Demodulating circuit, demodulating apparatus, demodulating method, and modulating/demodulating system of acoustic signals |
| 09/29/1998 | US5813480 Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations |
| 09/23/1998 | EP0866213A2 A method and apparatus for acquiring data in a hydrocarbon well |
| 09/23/1998 | EP0865613A1 Composite material structures having reduced signal attenuation |
| 09/23/1998 | EP0865612A1 Use of acoustic emission in rock formation analysis |
| 09/22/1998 | US5812493 Method of representing the trajectory of at least one borehole in a space-time domain |
| 09/22/1998 | US5812068 Drilling system with downhole apparatus for determining parameters of interest and for adjusting drilling direction in response thereto |
| 09/22/1998 | US5810080 Device for exploring an underground formation crossed by a horizontal well comprising several anchorable sondes |
| 09/16/1998 | CN1193104A Self-jacking type sensor |
| 09/15/1998 | US5809163 Method of characterizing texture heterogeneities of geological formations traversed by a borehole |
| 09/15/1998 | US5808779 Optical fiber modulation and demodulation system |
| 09/15/1998 | US5808192 Arrangement for acquiring downhole information |
| 09/15/1998 | US5806612 Apparatus for the transmission of information in a drill string |
| 09/15/1998 | US5806596 One-trip whipstock setting and squeezing method |
| 09/15/1998 | US5806195 Of a well borehole |
| 09/15/1998 | US5806194 Method for conducting moving or rolling check shot for correcting borehole azimuth surveys |
| 09/11/1998 | WO1998039551A1 Spring loaded borehole instrument |
| 09/10/1998 | DE19707530A1 Verfahren und Vorrichtung zur Gewinnung von geologischer Information A method and apparatus for obtaining geological information |
| 09/09/1998 | EP0862683A1 Method of qualifying a borehole survey |
| 09/09/1998 | EP0862682A2 Autonomous downhole oilfield tool |
| 09/09/1998 | CN2290689Y Box type side flow blowout-proof pressure cap |
| 09/08/1998 | US5804715 Hydrodynamic dampening system for the precise measurement of dynamic sediment pore water pressure |
| 09/08/1998 | US5804714 Flow meter |
| 09/08/1998 | US5804713 Apparatus for sensor installations in wells |
| 09/08/1998 | US5803185 Steerable rotary drilling systems and method of operating such systems |
| 09/08/1998 | US5803167 Computer controlled downhole tools for production well control |
| 09/04/1998 | CA2231208A1 Apparatus for remote measurement of earth well in-bore and well-site conditions |
| 09/03/1998 | WO1998038412A1 Method and device for obtaining geological information |
| 09/02/1998 | EP0861364A2 Electronic compass |
| 09/02/1998 | CN2289876Y Integral multiparameter remote transmission producing logging instrument |
| 09/01/1998 | US5802011 Pressure signalling for fluidic media |
| 09/01/1998 | US5801642 Device for exploring an underground formation crossed by a horizontal well comprising several sensors permanently coupled with the wall |
| 09/01/1998 | US5799742 Core drilling latch assembly |
| 09/01/1998 | US5799740 Directional boring head with blade assembly |
| 09/01/1998 | US5799732 Small hole retrievable perforating system for use during extreme overbalanced perforating |
| 08/27/1998 | WO1998037301A1 Subsurface probe system for chemical and mineral exploration |
| 08/27/1998 | WO1998037300A1 Bottomhole assembly and methods of use |
| 08/27/1998 | WO1998022689A3 Whipstock |
| 08/27/1998 | WO1998021444A3 Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch |
| 08/27/1998 | CA2578726A1 Bottom hole assembly and methods of use |
| 08/27/1998 | CA2253227A1 Subsurface probe system for chemical and mineral exploration |
| 08/26/1998 | EP0702799B1 Electrical logging system |
| 08/26/1998 | CN1191265A Holefinding apparatus having integrated sensors |
| 08/25/1998 | US5798488 Drilling apparatus |
| 08/19/1998 | CN2288267Y Automatic recorder for depth of falling well |
| 08/18/1998 | US5795991 Drilling apparatus |
| 08/18/1998 | US5795474 Method and apparatus for the separation of hazardous waste from groundwater |
| 08/18/1998 | US5794720 Method of assaying downhole occurrences and conditions |
| 08/18/1998 | US5794719 Ground boring apparatus |
| 08/12/1998 | EP0857855A1 Downhole directional measurement system |
| 08/12/1998 | EP0857853A2 Drill bit for horizontal directional drilling of rock formations |
| 08/12/1998 | EP0857852A2 Method for horizontal directional drilling of rock formations |