| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 02/13/2001 | US6188222 Method and apparatus for measuring resistivity of an earth formation |
| 02/13/2001 | US6186237 Annulus check valve with tubing plug back-up |
| 02/13/2001 | US6186229 Downhole connector for production tubing and control line and method |
| 02/13/2001 | CA2315482A1 Early evaluation system for cased wellbore |
| 02/08/2001 | WO2001009483A1 Method for determining a fluid contact level in a formation |
| 02/08/2001 | WO2000077932A3 Opto-electrical actuation system and method |
| 02/06/2001 | US6182764 Generating commands for a downhole tool using a surface fluid loop |
| 02/01/2001 | WO2001007937A1 Apparatus for drilling a borehole with a non-rotating sleeve comprising an nmr sensor |
| 02/01/2001 | WO2001007755A1 Methods and apparatus for dynamically estimating the location of an oil-water interface in a petroleum reservoir |
| 02/01/2001 | WO2001007754A1 Methods and apparatus for long term monitoring of a hydrocarbon reservoir |
| 02/01/2001 | WO2000045099A3 Cooling system for downhole tools |
| 01/31/2001 | EP1072903A1 Apparatus for nuclear magnetic resonance measuring while drilling a borehole |
| 01/31/2001 | EP1072755A1 Apparatus formed from a polyaryletherketone-type thermoplastic material for placement in a borehole |
| 01/31/2001 | CN2417289Y Whole stroke sealing and over line pushing type hole diameter instrument |
| 01/30/2001 | US6182013 Methods and apparatus for dynamically estimating the location of an oil-water interface in a petroleum reservoir |
| 01/30/2001 | US6179067 Method for magnetic survey calibration and estimation of uncertainty |
| 01/30/2001 | US6179066 Stabilization system for measurement-while-drilling sensors |
| 01/30/2001 | US6179052 Digital-hydraulic well control system |
| 01/30/2001 | CA2047282C Attitude control device and drilling-direction control device |
| 01/27/2001 | CA2314622A1 Reuseable cutting and milling tool |
| 01/25/2001 | WO2001006125A1 A mechanical oil recovery method and system with a sucker rod pump |
| 01/25/2001 | WO2001006085A1 Improved sonde housing structure |
| 01/25/2001 | CA2343382A1 Improved sonde housing structure |
| 01/24/2001 | EP1070196A1 Apparatus and method for enhancing remote sensor performance |
| 01/23/2001 | US6177882 Electromagnetic-to-acoustic and acoustic-to-electromagnetic repeaters and methods for use of same |
| 01/23/2001 | US6176682 Pumpjack dynamometer and method |
| 01/23/2001 | US6176323 Drilling systems with sensors for determining properties of drilling fluid downhole |
| 01/23/2001 | US6176312 Method and apparatus for the remote control and monitoring of production wells |
| 01/23/2001 | US6176129 Method and apparatus for acquiring data in a hydrocarbon well |
| 01/23/2001 | US6176128 Borehole tilt meter |
| 01/23/2001 | CA2140757C System and method for protecting optical elements from down-hole fluids |
| 01/18/2001 | WO2001004662A1 Propagating wave earth formation resistivity measuring arrangement |
| 01/18/2001 | WO2001004661A2 Downhole sensing apparatus with separable elements |
| 01/18/2001 | WO2001004601A1 A method and apparatus for determining the mean density of a fluid flowing in a hydrocarbon well that is inclined or horizontal |
| 01/18/2001 | WO2001004581A1 Method and apparatus for determining flow rates |
| 01/18/2001 | WO2001004461A1 Data transmission in pipeline systems |
| 01/18/2001 | WO2001004460A1 Sensing device |
| 01/18/2001 | WO2001004459A1 Downhole anchoring tools conveyed by non-rigid carriers |
| 01/18/2001 | CA2378693A1 Propagating wave earth formation resistivity measuring arrangement |
| 01/17/2001 | EP1068425A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 01/16/2001 | US6175380 Method for randomly accessing stored imagery and a field inspection system employing the same |
| 01/16/2001 | US6173804 System intended for permanent installation of measuring sondes in a pipe by means of a fluid pressure-actuated removable lock |
| 01/16/2001 | US6173793 Measurement-while-drilling devices with pad mounted sensors |
| 01/16/2001 | US6173773 Orienting downhole tools |
| 01/16/2001 | US6173772 Controlling multiple downhole tools |
| 01/16/2001 | US6173606 Logging tool for cement evaluation |
| 01/11/2001 | WO2001003323A1 Power line communication system |
| 01/09/2001 | US6172614 Method and apparatus for remote actuation of a downhole device using a resonant chamber |
| 01/09/2001 | US6170601 Borehole seismic tool |
| 01/09/2001 | US6170573 Freely moving oil field assembly for data gathering and or producing an oil well |
| 01/04/2001 | WO2001001088A1 Measurement of propagating acoustic waves in compliant pipes |
| 01/04/2001 | WO2000053887A3 Wellbore primary barrier and related systems |
| 01/04/2001 | WO2000031376A3 Method and system for accessing subterranean deposits from the surface |
| 01/03/2001 | CN1278893A Multi-well computerized control of fluid pumping |
| 01/03/2001 | CN1060247C Method and apparatus for measuring position of mud loss |
| 01/03/2001 | CN1060246C Method and apparatus for measuring position of cementing plug |
| 01/03/2001 | CN1060245C Emulator of gradiometer |
| 01/02/2001 | US6167965 Electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores |
| 01/02/2001 | CA2001442C Pressure sensor usable in oil wells |
| 12/27/2000 | EP1062753A1 Borehole transmission system using impedance modulation |
| 12/27/2000 | EP1062617A1 Method for correcting well log data for effects of changes in instrument velocity (cable yo-yo) |
| 12/27/2000 | EP1062529A1 Clamped receiver array using coiled tubing conveyed packer elements |
| 12/26/2000 | US6166994 Seismic detection apparatus and method |
| 12/26/2000 | US6164127 Well flowmeter and down-hole sampler |
| 12/26/2000 | US6164126 Earth formation pressure measurement with penetrating probe |
| 12/21/2000 | WO2000077932A2 Opto-electrical actuation system and method |
| 12/21/2000 | WO2000077345A1 Acoustic telemetry system with drilling noise cancellation |
| 12/20/2000 | EP1060450A1 Method for measuring and controlling the flow of natural gas from gas wells |
| 12/20/2000 | EP1060327A1 Inflow detection apparatus and system for its use |
| 12/19/2000 | US6161630 Apparatus and method for controlling an underground boring tool |
| 12/19/2000 | CA2279539C Near field electromagnetic proximity determination |
| 12/14/2000 | WO2000075484A1 Apparatus and method for controlling fluid flow in a wellbore |
| 12/14/2000 | WO2000075480A1 Core orientation |
| 12/14/2000 | CA2453891A1 Acoustic isolator for downhole applications |
| 12/14/2000 | CA2311473A1 Method and system of communicating in a subterranean well |
| 12/13/2000 | EP1058823A1 Apparatus and method for protecting devices, especially fibre optic devices, in hostile environments |
| 12/13/2000 | CN2410418Y Static pressure eccentric tester joint for water injection well |
| 12/12/2000 | US6160492 Through formation electromagnetic telemetry system and method for use of the same |
| 12/12/2000 | US6160401 Boring technique using locate point measurements for boring tool depth prediction |
| 12/12/2000 | US6158714 Adjustable orifice valve |
| 12/12/2000 | US6158533 Adjustable gauge downhole drilling assembly |
| 12/12/2000 | US6158532 Subassembly electrical isolation connector for drill rod |
| 12/12/2000 | US6158529 Rotary steerable well drilling system utilizing sliding sleeve |
| 12/12/2000 | US6158276 Apparatus for measuring and recording data from boreholes |
| 12/12/2000 | CA2017324C Apparatus for testing an oil well, and corresponding method |
| 12/07/2000 | WO2000073625A1 Method of utilizing flowable devices in wellbores |
| 12/07/2000 | WO2000073624A1 Thermal insulation vessel |
| 12/07/2000 | WO2000033492A9 Method and apparatus for remote actuation of a downhole device in a subsea well |
| 12/07/2000 | DE19925731C1 Drill head control device for tunneling drill has housing enclosing light component group with diode target light, target light source and control/evalaution circuit coupled to camera at opposite end of drill rod |
| 12/05/2000 | US6155608 Self-locking connector |
| 12/05/2000 | US6155347 Method and apparatus for controlling the liquid level in a well |
| 11/30/2000 | WO2000046485A3 Apparatus and method for enhancing remote sensor performance |
| 11/29/2000 | CN1059011C Multifunctional full-path ground directly-reading tester |
| 11/28/2000 | US6154704 Method for correcting well log data for effects of changes in instrument velocity cable yo-yo |
| 11/28/2000 | US6152230 High pressure tree cap |
| 11/28/2000 | US6152226 System and process for secondary hydrocarbon recovery |
| 11/28/2000 | US6152225 Method and apparatus for multi-diameter testing of blowout preventer assemblies |
| 11/28/2000 | US6151961 Downhole depth correlation |
| 11/23/2000 | WO2000070187A1 Flow monitoring and control in multi-lateral wellbores |
| 11/23/2000 | WO2000029713A3 Method and apparatus for connecting a lateral branch liner to a main well bore |