| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 01/18/2005 | US6843332 Three dimensional steerable system and method for steering bit to drill borehole |
| 01/18/2005 | US6843318 Method and system for determining the position and orientation of a device in a well casing |
| 01/18/2005 | US6843317 System and method for autonomously performing a downhole well operation |
| 01/18/2005 | US6843120 Apparatus and method of monitoring and signaling for downhole tools |
| 01/18/2005 | US6843119 Apparatus for measuring and recording data from boreholes |
| 01/18/2005 | US6843117 Method and apparatus for determining downhole pressures during a drilling operation |
| 01/18/2005 | US6842990 Inclinometer system |
| 01/18/2005 | CA2239280C Formation data sensing with deployed remote sensors during well drilling |
| 01/13/2005 | WO2003087520A3 Apparatus and method of detecting interfaces between well fluids and for detecting the launch of a device in oilfield applications |
| 01/13/2005 | US20050006145 Control Method for use with a Steerable Drilling System |
| 01/13/2005 | US20050006090 Electrical imaging in conductive and non-conductive mud |
| 01/13/2005 | US20050005694 Use of cesium as a tracer in coring operations |
| 01/13/2005 | US20050005624 Downhole sorption cooling and heating in wireline logging and monitoring while drilling |
| 01/12/2005 | EP1373938A4 Method and apparatus for determining the high side of a drill string during gamma mwd operations and correlating gamma events therewith |
| 01/12/2005 | EP1088152B1 Method of determining azimuth of a borehole |
| 01/12/2005 | CN2670601Y Anti-drop device of well testing equipment |
| 01/12/2005 | CN2670600Y Window tester |
| 01/12/2005 | CN2670599Y Rotary stratigraphic tester |
| 01/12/2005 | CN1563668A Method of model of interpreting state space for raising precision of water flooded layer |
| 01/12/2005 | CN1563667A Data processing method of raising resolution of well-long information |
| 01/11/2005 | US6842699 Use of MWD assembly for multiple-well drilling |
| 01/11/2005 | US6841984 Power source regulator for wireline cable system |
| 01/11/2005 | US6840317 Wireless downwhole measurement and control for optimizing gas lift well and field performance |
| 01/11/2005 | US6840316 Tracker injection in a production well |
| 01/11/2005 | US6840114 Housing on the exterior of a well casing for optical fiber sensors |
| 01/11/2005 | US6840110 Apparatus to measure differential pressure with settable pressure reference |
| 01/11/2005 | US6840091 Geophysical method for quantification of dense non-aqueous phase liquids in the subsurface |
| 01/11/2005 | CA2218259C Motor drive actuator for downhole flow control devices |
| 01/06/2005 | WO2005001240A1 Plug and expel flow control device |
| 01/06/2005 | WO2005001232A2 Determination of thermal properties of a formation |
| 01/06/2005 | US20050001738 Transmission element for downhole drilling components |
| 01/06/2005 | US20050001737 Drill string rotation encoding |
| 01/06/2005 | US20050001735 Link module for a downhole drilling network |
| 01/06/2005 | US20050001734 Sensor system and method of communicating data between a downhole device on a remote location |
| 01/06/2005 | US20050001624 Apparatus and method for resistivity measurements during rotational drilling |
| 01/06/2005 | US20050000733 Systems and methods for performing mud pulse telemetry using a continuously variable transmission |
| 01/06/2005 | US20050000688 Quadrupole acoustic shear wave logging while drilling |
| 01/06/2005 | US20050000279 Acoustic sensor for downhole measurement tool |
| 01/05/2005 | EP1492936A1 Method and device for detecting leaks in an annulus of a riser |
| 01/05/2005 | CN2668852Y Mechanical well-depth positioner |
| 01/05/2005 | CN2668851Y Tension head harness |
| 01/05/2005 | CN2668850Y Well-control pressure-testing joint |
| 01/05/2005 | CN1560580A Hollow structure large range torque dynamic measuring device and method |
| 01/05/2005 | CN1560431A Method of bridge type eccentric pouring water layering pressure testing |
| 01/05/2005 | CN1560430A Wireless network intelligent indicating apparatus and its controlling method |
| 01/05/2005 | CN1560429A Disision method of plugging water for integral regulating profile of water flood oil field |
| 01/04/2005 | US6838882 Method for avoiding an inground obstacle at a known depth |
| 01/04/2005 | US6838881 Flux orientation locating in a drilling system |
| 01/04/2005 | US6837314 Sub apparatus with exchangeable modules and associated method |
| 01/04/2005 | US6837105 Atomic clock for downhole applications |
| 01/04/2005 | CA2201552C Noise detection and suppression system for wellbore telemetry |
| 12/30/2004 | US20040263350 Permanent downhole, wireless, two-way telemetry backbone using redundant repeaters |
| 12/30/2004 | US20040263175 Apparatus for monitoring underground formations |
| 12/30/2004 | US20040263158 Apparatus detecting relative body movement |
| 12/30/2004 | US20040262044 Systems and methods for directionally drilling a borehole using a continuously variable transmission |
| 12/30/2004 | US20040262043 Systems and methods for the drilling and completion of boreholes using a continuously variable transmission to control one or more system components |
| 12/30/2004 | US20040262041 Apparatus and method of controlling motion and vibration of an NMR sensor in a drilling bha |
| 12/30/2004 | US20040262016 Plug and expel flow control device |
| 12/30/2004 | US20040262008 Subsea communications system |
| 12/29/2004 | WO2004113677A1 Apparatus and method for self-powered communication and sensor network |
| 12/29/2004 | WO2004113676A2 A sensor system and method of communicating data between a downhole device on a remote location |
| 12/29/2004 | WO2004113675A1 System and method for tracking and communicating with a boring tool |
| 12/29/2004 | WO2004113674A1 Formation resistivity measurement sensor contained onboard a drill bit (risistivity in bit) |
| 12/29/2004 | WO2004113673A1 Method and apparatus for formation testing |
| 12/29/2004 | EP1491718A2 A Stroke Indicator and a Tubular Patch |
| 12/29/2004 | CN2667158Y Multifunction pigging gauge |
| 12/29/2004 | CN1558089A Photoelectric 12 divisions drilling tools face angle drill following sensor |
| 12/28/2004 | US6836218 Modified tubular equipped with a tilted or transverse magnetic dipole for downhole logging |
| 12/28/2004 | US6834732 Method of assessing positional uncertainty in drilling a well |
| 12/28/2004 | US6834560 Groundwater sensor array for insertion into a narrow-bore well |
| 12/28/2004 | CA2353164C Rf communication with downhole equipment |
| 12/28/2004 | CA2341181C Method and apparatus for determining position in a pipe |
| 12/23/2004 | WO2004111389A1 System and method for transmitting electric power into a bore |
| 12/23/2004 | WO2004111388A1 Method and apparatus for acoustic detection of a fluid leak behind a casing of a borehole |
| 12/23/2004 | WO2004081494A3 Determination of the orientation of a dowhole device |
| 12/23/2004 | US20040257912 Method and apparatus for generating acoustic signals for LWD shear velocity measurement |
| 12/23/2004 | US20040257241 Method and apparatus for transporting data |
| 12/23/2004 | US20040256159 Underground drilling device employing down-hole radar |
| 12/23/2004 | US20040256113 Methods and apparatus for actuating a downhole tool |
| 12/23/2004 | US20040256101 Formation characterization using wellbore logging data |
| 12/23/2004 | US20040256100 Method and apparatus of providing an optical fiber along a power supply line |
| 12/23/2004 | US20040255481 Length adjustable tool for aligning boring bar |
| 12/23/2004 | US20040255479 Method and apparatus for measuring a distance |
| 12/22/2004 | EP1192715B1 Opto-electrical actuation system and method |
| 12/22/2004 | CN2665358Y Exploration logging apparatus with pressure |
| 12/22/2004 | CN2665352Y Multifunctional measuring plug |
| 12/22/2004 | CN1181257C Bidimentional oil and gas migration and accumulation analogue experimental device |
| 12/21/2004 | US6832515 Method for measuring formation properties with a time-limited formation test |
| 12/18/2004 | CA2694851A1 Methods and apparatus for actuating a downhole tool |
| 12/16/2004 | WO2004109926A1 Method and system for downhole clock |
| 12/16/2004 | US20040253734 Down-hole pressure monitoring system |
| 12/16/2004 | US20040252748 Fiber optic sensing systems and methods |
| 12/16/2004 | US20040251898 Systems and methods of determining motion tool parameters in borehole logging |
| 12/16/2004 | US20040251048 Modular design for LWD/MWD collars |
| 12/16/2004 | US20040251032 Apparatus and methods for utilizing a downhole deployment valve |
| 12/16/2004 | US20040251027 Co-pilot measurement-while-fishing tool devices and methods |
| 12/15/2004 | EP1274992A4 Apparatus and method for downhole well equipment and process management, identification, and actuation |
| 12/15/2004 | CN2663655Y Seal device of cable passed oil pipe for production testing pressure measurement |
| 12/15/2004 | CN2663654Y Dual fail-safe bridle of insulation and pulling apart |
| 12/14/2004 | US6831571 Logging device data dump probe |