| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/01/2001 | US6223821 Inflatable packer inflation verification system |
| 04/30/2001 | CA2324573A1 Down hole tension/compression device for logging tools |
| 04/26/2001 | WO2001029373A1 Method of drilling a wellbore with disengageable couplers |
| 04/26/2001 | WO2001029372A1 The method of and apparatus for determining the path of a well bore under drilling conditions |
| 04/26/2001 | WO2001029371A1 Device for the progress-controlled drilling of bores |
| 04/26/2001 | WO2001029370A1 Asphaltenes monitoring and control system |
| 04/26/2001 | WO2001029362A1 Positioning and conveying well apparatus and method |
| 04/26/2001 | DE19950340A1 Measuring the course of a borehole during drilling comprises determining each position with the aid of a measuring unit consisting of a gyroscope and acceleration sensors |
| 04/25/2001 | CN2427806Y Instrument for measuring water content rate in oil well |
| 04/25/2001 | CN2427629Y Oil well survey dynamometer fixation pin |
| 04/25/2001 | CN1292844A Inflow detection apparatus and system for its use |
| 04/25/2001 | CN1292495A Method for defining equivanlent static mud density by using downhole pressure measured value in course of connection |
| 04/24/2001 | US6220371 Downhole in-situ measurement of physical and or chemical properties including fluid saturations of cores while coring |
| 04/24/2001 | US6220346 Thermal insulation vessel |
| 04/24/2001 | US6220087 Method for determining equivalent static mud density during a connection using downhole pressure measurements |
| 04/24/2001 | CA2009674C Advanced apparatus for seismic monitoring of an underground deposit |
| 04/19/2001 | WO2001027657A1 Obtaining an image of an underground formation |
| 04/19/2001 | WO2001027435A1 Apparatus for transferring electrical energy between rotating and non-rotating members of downhole tools |
| 04/18/2001 | EP1092162A1 Method and apparatus for quick determination of the ellipticity of an earth borehole |
| 04/18/2001 | EP1025332A4 Multi-well computerized control of fluid pumping |
| 04/18/2001 | CN1292088A Method and apparatus for ultrasonic imaging of cased well |
| 04/17/2001 | US6219301 Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming |
| 04/17/2001 | US6218959 Fail safe downhole signal repeater |
| 04/17/2001 | US6216802 Gravity oriented directional drilling apparatus and method |
| 04/17/2001 | US6216783 Azimuth control of hydraulic vertical fractures in unconsolidated and weakly cemented soils and sediments |
| 04/17/2001 | US6216533 Apparatus for measuring downhole drilling efficiency parameters |
| 04/17/2001 | US6216532 Gas flow rate measurement |
| 04/17/2001 | CA2128604C Method and apparatus for acoustic shear wave logging |
| 04/12/2001 | WO2000052294A3 Drill head for directional boring |
| 04/11/2001 | EP1091084A1 Improved slick line system with real-time surface display |
| 04/11/2001 | EP1090269A1 Determining the shape and orientation of a borehole |
| 04/10/2001 | US6213207 Method of distinguishing between installing different sucker rods |
| 04/10/2001 | US6212952 System and process for optimizing gravity gradiometer measurements |
| 04/10/2001 | CA2107576C Short hop communication link for downhole mwd system |
| 04/05/2001 | WO2001023853A1 A method and apparatus for measuring forces in the presence of external pressure |
| 04/05/2001 | WO2001023706A1 Re-entry in multilateral wellbores |
| 04/05/2001 | WO2001023704A1 Tool assembly and monitoring applications using same |
| 04/05/2001 | WO1996041931B1 Subsurface signal transmitting apparatus |
| 04/05/2001 | CA2380372A1 A method and apparatus for measuring forces in the presence of external pressure |
| 04/04/2001 | EP1088152A1 Method of determining azimuth of a borehole |
| 04/04/2001 | EP0852652A4 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 04/04/2001 | CN1289889A Hierarchical monitor method for parameters of oil recovering layer in oil well |
| 04/04/2001 | CN1289888A Method for passing electric cable through oil tube in oil well |
| 04/03/2001 | US6212476 Apparatus to measure the earth's local gravity and magnetic field in conjunction with global positioning attitude determining |
| 04/03/2001 | US6209660 Drill bit shear relief for horizontal directional drilling of rock formations |
| 04/03/2001 | US6209648 Method and apparatus for connecting a lateral branch liner to a main well bore |
| 04/03/2001 | US6209640 Method of obtaining improved geophysical information about earth formations |
| 04/03/2001 | US6209639 Method of ensuring that well tubing was properly stretched |
| 04/03/2001 | US6209636 Wellbore primary barrier and related systems |
| 04/03/2001 | US6209635 Positioning and conveying well apparatus and method |
| 04/03/2001 | US6209632 Subsurface signal transmitting apparatus |
| 04/03/2001 | US6209391 Free fall survey instrument |
| 03/29/2001 | WO2001021928A2 High data rate acoustic telemetry system |
| 03/29/2001 | WO2001021927A2 Real-time control system and method for controlling an underground boring machine |
| 03/28/2001 | EP1086294A1 Method and system for measuring data in a fluid transportation conduit |
| 03/28/2001 | EP1086291A1 Directional drilling system and apparatus |
| 03/28/2001 | CA2320393A1 Method and apparatus for controlling of coning in hydrocarbon recovery |
| 03/27/2001 | US6208586 Method and apparatus for communicating data in a wellbore and for detecting the influx of gas |
| 03/27/2001 | US6206133 Clamped receiver array using tubing conveyed packer elements |
| 03/27/2001 | US6206108 Drilling system with integrated bottom hole assembly |
| 03/27/2001 | US6205851 Method for determining drill collar whirl in a bottom hole assembly and method for determining borehole size |
| 03/27/2001 | CA2154959C Steerable drilling tool and system |
| 03/24/2001 | CA2319891A1 Slickline fluid identification tool |
| 03/22/2001 | WO2001020129A2 Apparatus and methods for measuring depth |
| 03/22/2001 | WO2001020126A2 System for enhancing fluid flow in a well |
| 03/21/2001 | EP0852653A4 Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means |
| 03/21/2001 | CN2424296Y Sealing section and restoring device |
| 03/20/2001 | US6205087 Sonic data logging system |
| 03/20/2001 | US6202752 Wellbore milling methods |
| 03/15/2001 | WO2001018358A1 Rotating radio frequency transmission system |
| 03/15/2001 | WO2001018357A2 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 03/15/2001 | CA2318713A1 Device for mounting a cable and/or control lines to a tubing string or other tubular structure |
| 03/14/2001 | EP1083298A2 Plug release indicator in a well |
| 03/14/2001 | EP1082517A1 Generating commands for a downhole tool |
| 03/14/2001 | CN2423402Y Proving installation while drilling |
| 03/14/2001 | CN1063264C Materials used for oil-submersible electric pump undershaft pressure and temperature sensor and its producing method |
| 03/13/2001 | US6199632 Selectively locking locator |
| 03/13/2001 | US6199629 Computer controlled downhole safety valve system |
| 03/13/2001 | US6199628 Downhole force generator and method |
| 03/07/2001 | CA2317261A1 Detector apparatus and method for oil or gas well, and object to be detected therein |
| 03/06/2001 | US6196321 Wye block having automatically aligned guide structure |
| 02/28/2001 | EP1078145A2 Coupling with shape-memory material , disconnecting tool with a piston and coupling with valves |
| 02/27/2001 | US6192988 Production well telemetry system and method |
| 02/27/2001 | US6192983 Coiled tubing strings and installation methods |
| 02/27/2001 | US6192980 Method and apparatus for the remote control and monitoring of production wells |
| 02/27/2001 | US6192748 Dynamic orienting reference system for directional drilling |
| 02/20/2001 | US6191585 Tracking the positional relationship between a boring tool and one or more buried lines using a composite magnetic signal |
| 02/20/2001 | US6189612 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 02/20/2001 | US6189383 Method and apparatus for acoustic logging of fluid density and wet cement plugs in boreholes |
| 02/20/2001 | CA2201215C Well collar identification method |
| 02/17/2001 | CA2316131A1 Fiber optic monitoring of sand control equipment via tubing string |
| 02/15/2001 | WO2001011191A1 Method and apparatus for drill stem data transmission |
| 02/15/2001 | WO2001011190A1 A method and apparatus for acquiring data in a hydrocarbon well in production |
| 02/15/2001 | WO2001011189A2 Apparatus for optimizing production of multi-phase fluid |
| 02/15/2001 | WO2001011180A1 Continuous wellbore drilling system with stationary sensor measurements |
| 02/14/2001 | EP1076156A2 Early evaluation system for a cased wellbore |
| 02/14/2001 | EP1076155A1 Coding system for use in a wellbore |
| 02/13/2001 | US6188647 Extension method of drillstring component assembly |
| 02/13/2001 | US6188643 Method and apparatus for inspecting well bore casing |
| 02/13/2001 | US6188552 High resistance grounding systems for oil well electrical systems |