| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/08/2004 | US20040006429 Method and apparatus for determining flow rates |
| 01/08/2004 | US20040004660 Method and apparatus to create a down-hole video log to transmit down-hole video data |
| 01/08/2004 | US20040003658 Acoustic doppler downhole fluid flow measurement |
| 01/08/2004 | CA2490784A1 In-situ detection and analysis of coal bed methane formations |
| 01/07/2004 | EP1377725A2 Hydraulically balanced reciprocating pulser valve for mud pulse telemetry |
| 01/07/2004 | CN1466693A Method and apparatus for transmitting information to the surface from a drill string down hole in a well |
| 01/06/2004 | US6672389 Bulged single-hinged scored rupture having a non-circular varying depth score line |
| 01/06/2004 | US6672383 Subsurface signal transmitting apparatus |
| 01/06/2004 | US6672163 Acoustic sensor for fluid characterization |
| 01/06/2004 | US6672093 Downhole sorption cooling and heating in wireline logging and monitoring while drilling |
| 01/06/2004 | CA2332264C Apparatus for measuring magnetic declination using gps |
| 01/06/2004 | CA2127327C Ultrasonic stand-off gauge |
| 01/02/2004 | EP1373938A1 Method and apparatus for determining the high side of a drill string during gamma mwd operations and correlating gamma events therewith |
| 01/01/2004 | US20040000636 Determining dew precipitation and onset pressure in oilfield retrograde condensate |
| 01/01/2004 | US20040000401 Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool |
| 01/01/2004 | US20040000400 Assessing downhole WBM-contaminated connate water |
| 12/31/2003 | WO2004001356A2 Technique and system for measuring a characteristic in a subterranean well |
| 12/31/2003 | WO2004001352A2 Apparatus and method of monitoring and signaling for downhole tools |
| 12/31/2003 | WO2004001189A2 Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool |
| 12/31/2003 | WO2002072993B1 Hydraulically balanced reciprocating pulser valve for mud pulse telemetry |
| 12/31/2003 | CN2596011Y Well-head connector for electronic sounding |
| 12/30/2003 | US6670880 Downhole data transmission system |
| 12/30/2003 | US6668946 Backreamer |
| 12/30/2003 | US6668944 Path mapping in underground boring tool applications |
| 12/30/2003 | US6668921 Providing a conduit for an instrumentation line |
| 12/30/2003 | US6668918 Method and system for accessing subterranean deposit from the surface |
| 12/30/2003 | US6668465 Continuous measurement-while-drilling surveying |
| 12/30/2003 | CA2260307C Subassembly electrical isolation connector for drill rod |
| 12/25/2003 | US20030236627 Use of MWD assembly for multiple-well drilling |
| 12/25/2003 | US20030235114 Subsurface borehole evaluation and downhole tool position determination methods |
| 12/25/2003 | US20030233894 Apparatus for measuring shape of pipeline and method therefor |
| 12/25/2003 | US20030233873 Apparatus and method of monitoring and signaling for downhole tools |
| 12/25/2003 | US20030233759 Inclinometer system |
| 12/24/2003 | WO2003106932A1 Pumping system for oil wells |
| 12/24/2003 | WO2003106587A1 Double emulsion based drilling fluids |
| 12/24/2003 | WO2003080988A3 Drill head and method for controlled horizontal drilling |
| 12/24/2003 | WO2003041282A9 Passive two way borehole communication apparatus and method |
| 12/24/2003 | WO2003021301A3 Method and apparatus for determining the temperature of subterranean wells using fiber optic cable |
| 12/24/2003 | CN1131924C Downhole instrument with outer cover able to penetrance ray |
| 12/24/2003 | CA2487863A1 Pumping system for oil wells |
| 12/23/2003 | US6666285 Logging-while-drilling apparatus and methods for measuring density |
| 12/23/2003 | CA2270757C Nuclear magnetic resonance logging with azimuthal resolution |
| 12/19/2003 | CA2427119A1 Subsurface borehole evaluation and downhole tool position determination methods |
| 12/18/2003 | WO2003104606A1 Tool module connector for use in directional drilling |
| 12/18/2003 | US20030231117 System and method for monitoring packer slippage |
| 12/18/2003 | US20030230893 Spoolable composite coiled tubing connector |
| 12/18/2003 | US20030230409 Instrumentation assembly for an offshore riser |
| 12/17/2003 | EP1370891A1 Sonde |
| 12/17/2003 | EP1370747A2 Length correction system and methods |
| 12/17/2003 | EP1370746A1 Electromagnetic borehold surveying method |
| 12/17/2003 | CN2592869Y Apparatus for measuring underground temperature |
| 12/17/2003 | CN2592868Y Pressure transmitting cylinder of pressure test survey for oil-water well |
| 12/17/2003 | CN1462329A Method for characterising parameters of wells, well bottom zone and formation, and device for carrryingout said method |
| 12/17/2003 | CN1461871A Joint for wire pipe with current loop inductive coupler |
| 12/17/2003 | CN1131427C Oil well water capacity measuring instrument |
| 12/16/2003 | US6662884 Method for determining sweep efficiency for removing cuttings from a borehole |
| 12/16/2003 | US6662875 Induction choke for power distribution in piping structure |
| 12/16/2003 | US6662645 Apparatus and method for measuring forces on well logging instruments |
| 12/16/2003 | CA2298375C Rotary steerable well drilling system utilizing hydraulic servo-loop |
| 12/16/2003 | CA2229329C Borehole surveying |
| 12/16/2003 | CA2217356C Method and apparatus for drilling and re-entering multiple lateral branches in a well |
| 12/16/2003 | CA2108388C Downhole tool |
| 12/12/2003 | CA2390470A1 Method and apparatus for gas lift system for oil and gas wells |
| 12/11/2003 | WO2003102372A1 Method and apparatus for a high resolution downhole spectrometer |
| 12/11/2003 | WO2003102370A1 Parameter sensing apparatus and method for subterranean wells |
| 12/11/2003 | WO2003102369A1 System and method for quantitatively determining formation characteristic variations after events |
| 12/11/2003 | WO2003006779A3 Method and apparatus to monitor, control and log subsea oil and gas wells |
| 12/11/2003 | US20030227393 Wireless power and communications cross-bar switch |
| 12/11/2003 | US20030226662 Apparatus for attaching a sensor to a tubing string |
| 12/11/2003 | CA2488451A1 Method and apparatus for a high resolution downhole spectrometer |
| 12/10/2003 | CN2591626Y Oxygen activation up-down water flow combined logging instrument |
| 12/10/2003 | CN2591228Y Falling proof blowout preventing box |
| 12/10/2003 | CN2591227Y Borehole self-locking device |
| 12/10/2003 | CN1460770A Deep well detection optical-fiber transmission system |
| 12/09/2003 | US6659200 Actuator assembly and method for actuating downhole assembly |
| 12/09/2003 | US6659196 Core orientation |
| 12/09/2003 | US6659175 Mixing water, buffers, oxidizers, gels, gelation inhibitors, stabilizer and curing agents with tracers, then pumping the mixtures into bores, withdrawing fluids and measuring concentration of labels; well completion efficiency |
| 12/09/2003 | CA2243756C Aided inertial navigation systems |
| 12/04/2003 | WO2003101047A2 A method and apparatus for high speed communication with a downhole tool |
| 12/04/2003 | WO2003100218A1 Deployment of underground sensors |
| 12/04/2003 | WO2003100217A1 Liquid level measurement |
| 12/04/2003 | WO2003100210A1 A downhole tool for use in a wellbore |
| 12/04/2003 | US20030223620 Methods of producing images of underground formations surrounding a borehole |
| 12/04/2003 | US20030221869 System and method for quantitatively determining variations of a formation characteristic after an event |
| 12/04/2003 | US20030221829 Well communication system |
| 12/03/2003 | EP1367216A2 Wired pipe joint with current-loop inductive couplers |
| 12/03/2003 | EP1366270A1 Logging system for use in a wellbore |
| 12/03/2003 | EP1115961B1 Through-drill string conveyed logging system |
| 12/03/2003 | CN2589946Y Multiple flow rate test well |
| 12/03/2003 | CN1459547A Oil pumping machine three D dynamic testing instrument and its testing method |
| 12/02/2003 | US6657199 Flexible dynamic housing |
| 12/02/2003 | US6655464 Auto-extending/retracting electrically isolated conductors in a segmented drill string |
| 12/02/2003 | US6655460 Methods and apparatus to control downhole tools |
| 12/02/2003 | US6655458 Formation testing instrument having extensible housing |
| 12/02/2003 | US6655457 Method for use in sampling and/or measuring in reservoir fluid |
| 12/02/2003 | US6655452 Downhole gauge carrier apparatus |
| 11/27/2003 | WO2003098179A1 System and method for packaging a fibre optic sensor |
| 11/27/2003 | WO2003098153A2 Downhole tool deployment safety system and methods |
| 11/27/2003 | WO2003097999A1 Mwd formation tester |
| 11/27/2003 | WO2003097998A1 Joint detection |