| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 03/13/2002 | EP1185761A1 Acoustic telemetry system with drilling noise cancellation |
| 03/13/2002 | CA2356203A1 Pressurized system for protecting signal transfer capability at a subsurface location |
| 03/12/2002 | US6355928 Fiber optic tomographic imaging of borehole fluids |
| 03/12/2002 | US6354734 Apparatus for accurate temperature and pressure measurement |
| 03/12/2002 | US6354375 Lateral well tie-back method and apparatus |
| 03/12/2002 | US6354371 Jet pump assembly |
| 03/12/2002 | US6354146 Acoustic transducer system for monitoring well production |
| 03/12/2002 | CA2035823C Method and system for controlling vibrations in borehole equipment |
| 03/07/2002 | WO2001086116B1 Measuring device for detecting a body moving in relation to a tubular container |
| 03/07/2002 | US20020027004 Computer controlled injection wells |
| 03/07/2002 | US20020027002 Downhole flow control devices |
| 03/06/2002 | EP1184539A2 Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal |
| 03/06/2002 | CN1339082A Multilateral well and electrical transmission system |
| 03/06/2002 | CN1080367C Logging method and system |
| 03/05/2002 | US6353321 Uncompensated electromagnetic wave resistivity tool for bed boundary detection and invasion profiling |
| 03/05/2002 | US6352109 Method and apparatus for gas lift system for oil and gas wells |
| 03/05/2002 | US6351987 Fiber optic pressure sensor for DC pressure and temperature |
| 03/05/2002 | US6351891 Miniature directional indication instrument |
| 02/28/2002 | US20020023758 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023757 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023756 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023747 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023745 Deviated borehole drilling assembly |
| 02/28/2002 | US20020023505 Apparatus for passive removal of subsurface contaminants and volume flow measurement |
| 02/27/2002 | EP1182327A1 Apparatus and method for propelling a data sensing apparatus into a subsurface formation |
| 02/27/2002 | EP1181435A1 Method of utilizing flowable devices in wellbores |
| 02/27/2002 | CN2479210Y Stratigraphic dip logging unit pad |
| 02/27/2002 | CN1079889C Method for qualifying a borehole survey |
| 02/27/2002 | CN1079888C Method and system for monitoring characteristic of earth formation in well |
| 02/26/2002 | US6350986 Analysis of downhole OBM-contaminated formation fluid |
| 02/26/2002 | US6349778 Integrated transmitter surveying while boring entrenching powering device for the continuation of a guided bore hole |
| 02/26/2002 | US6349768 Method and apparatus for all multilateral well entry |
| 02/26/2002 | US6349767 Disconnect tool |
| 02/26/2002 | US6349766 Chemical actuation of downhole tools |
| 02/26/2002 | CA2181065C Method of creating a borehole in an earth formation |
| 02/21/2002 | WO2002014907A1 Apparatus and method for synchronized formation measurement |
| 02/21/2002 | WO2002014644A2 Method and device for introducing tools or instruments into earth formations |
| 02/21/2002 | WO2000073624A9 Thermal insulation vessel |
| 02/21/2002 | US20020020561 Real-time control system and method for controlling an underground boring machine |
| 02/21/2002 | US20020020533 Production well telemetry system and method |
| 02/21/2002 | US20020020525 Intelligent thru tubing bridge plug with downhole instrumentation |
| 02/20/2002 | CN1079488C Logging instrument for vapor injecting well |
| 02/19/2002 | US6348876 Burst QAM downhole telemetry system |
| 02/19/2002 | CA2119986C Measuring-while-drilling telemetry apparatus and method |
| 02/14/2002 | WO2002012676A1 Apparatus and method for telemetry |
| 02/14/2002 | WO2001040771A3 Apparatus and method for analyzing fluids |
| 02/12/2002 | US6347282 Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal |
| 02/07/2002 | WO2001051761A8 Steerable modular drilling assembly |
| 02/07/2002 | US20020014338 Hydraulically operated fluid metering apparatus for use in a subterranean well |
| 02/07/2002 | US20020014334 Auto-extending/retracting electrically isolated conductors in a segmented drill string |
| 02/06/2002 | EP1177366A1 Apparatus and method for transmitting information to and communicating with a downhole device |
| 02/06/2002 | CN2475831Y Geology-guided wired on-drilling measuring instrument |
| 02/05/2002 | US6343656 System and method for optimizing production from a rod-pumping system |
| 02/05/2002 | US6343649 Methods and associated apparatus for downhole data retrieval, monitoring and tool actuation |
| 02/05/2002 | CA2142660C Corrosion monitoring tool |
| 02/05/2002 | CA2090322C System for multidirectional information transmission between at least two units of a drilling assembly |
| 02/03/2002 | CA2316095A1 A computerized process for discovering hydrocarbon by applying event recognition to oil & gas well logs |
| 01/31/2002 | WO2002008570A1 Drawdown apparatus and method for in-situ analysis of formation fluids |
| 01/31/2002 | US20020012837 Annular pack |
| 01/31/2002 | US20020011355 Method and apparatus for directional boring under mixed conditions |
| 01/31/2002 | US20020011335 Fuel cell for downhole and subsea power systems |
| 01/31/2002 | US20020011333 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 01/30/2002 | CN1333858A Method and system for accessing substerranean deposits from the surface |
| 01/29/2002 | US6341652 Backflow prevention device |
| 01/29/2002 | US6341498 Downhole sorption cooling of electronics in wireline logging and monitoring while drilling |
| 01/24/2002 | WO2002006716A1 Data transmission system for a string of downhole components |
| 01/24/2002 | WO2002006631A1 Borehole inspection videocamera |
| 01/24/2002 | WO2002006628A1 Method and apparatus for placing and interrogating downhole sensors |
| 01/24/2002 | WO2002006625A1 Deploying a cable through a guide conduit in a well |
| 01/24/2002 | WO2002006593A1 Sand screen with integrated sensors |
| 01/24/2002 | US20020010547 Long range electronic guidance system for locating a discrete in-ground boring device |
| 01/24/2002 | US20020008634 Signaling system for drilling |
| 01/24/2002 | US20020007970 Well system |
| 01/24/2002 | US20020007952 Cable actuated downhole smart pump |
| 01/24/2002 | US20020007948 Method of providing hydraulic/fiber conduits adjacent bottom hole assemblies for multi-step completions |
| 01/24/2002 | US20020007946 Hydraulic well control system |
| 01/24/2002 | CA2416111A1 Method and apparatus for placing and interrogating downhole sensors |
| 01/23/2002 | EP1174585A2 Apparatus and method for performing downhole measurements |
| 01/23/2002 | CN2473335Y Under well complex monitor for oil pumping well |
| 01/22/2002 | US6339886 Remotely measured caliper for wellbore fluid sample taking instrument |
| 01/22/2002 | CA2076026C Device for remotely operating an assembly comprising a bean/needle system, and use thereof in a drilling string |
| 01/17/2002 | WO2002004988A1 Remote sensing and measurement of distances along a borehole |
| 01/17/2002 | WO2002004785A1 Well management system |
| 01/17/2002 | WO2002004782A1 Apparatus and methods for orientation of a tubular string in a non-vertical wellbore |
| 01/17/2002 | US20020005298 Apparatus to measure the earth's local gravity and magnetic field in conjunction with global positioning attitude determination |
| 01/17/2002 | US20020005297 Underground boring machine employing solid-state inertial navigation control system and method |
| 01/17/2002 | US20020005286 Horizontal directional drilling in wells |
| 01/17/2002 | US20020005282 Subsurface signal transmitting apparatus |
| 01/17/2002 | CA2689859A1 Electromagnetic wave resistivity tool with tilted antenna |
| 01/16/2002 | EP0815345B1 Milling tool, whipstock, milling system and method of forming a window in the wall of a tubular |
| 01/16/2002 | CN1331376A Gravitational signal method for remotely controlling track in well and its device |
| 01/10/2002 | WO2001046548A3 Technique for signal detection using adaptive filtering in mud pulse telemetry |
| 01/10/2002 | WO2001042614A3 Method for compensating for remote clock offset |
| 01/10/2002 | US20020003040 Apparatus and methods for orientation of a tubular string in a non-vertical wellbore |
| 01/09/2002 | CN2470812Y Blocking-up electronic pressure gauge |
| 01/09/2002 | CN2470534Y Magnetic positioning instrument of single-core bridge plug dropping-feeder |
| 01/08/2002 | US6336408 Cooling system for downhole tools |
| 01/03/2002 | WO2001065062A3 Use of downhole high pressure gas in a gas-lift well |
| 01/03/2002 | WO2001064813A3 Conductive medium for openhole logging and logging while drilling |
| 01/03/2002 | US20020000320 Disconnect tool |