| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 07/07/1999 | EP0927812A2 Electromagnetic signal repeater |
| 07/07/1999 | CN2327784Y Automatic remote level measuring device for oil well by GSM communication |
| 07/07/1999 | CN1221850A Inspection system of oil extracting equipment working state |
| 07/07/1999 | CN1044039C Combination well logging device |
| 07/01/1999 | WO1999018322A3 Charge assembly for a pipe-coupling cutting device |
| 06/30/1999 | EP0906487A4 A system for directional control of drilling |
| 06/30/1999 | CN2326725Y Comprehensive well-logging vehicle |
| 06/29/1999 | US5917774 Magnetic motion coupling for well logging instruments |
| 06/29/1999 | US5915476 Monitoring well |
| 06/25/1999 | CA2256796A1 Ethylene/.alpha.-olefin copolymer and process for preparing the same |
| 06/24/1999 | WO1999031354A1 Method to determine self-calibrated circumferential cased bond impedance |
| 06/24/1999 | WO1999031348A1 System and method for positioning a tool in a wellbore |
| 06/24/1999 | WO1999031344A2 Miniature directional indication instrument |
| 06/24/1999 | WO1999015756A3 Multi-well computerized control of fluid pumping |
| 06/23/1999 | CN2325514Y Hand carried type multi-function tubing length measuring instrument |
| 06/23/1999 | CN2325513Y Combination type multi-purpose well logging instrument |
| 06/22/1999 | US5914911 Method of recovering data acquired and stored down a well, by an acoustic path, and apparatus for implementing the method |
| 06/22/1999 | US5914602 System including an arrangement for tracking the positional relationship between a boring tool and one or more buried lines and method |
| 06/16/1999 | EP0922836A1 Subsea repeater and method for use of the same |
| 06/15/1999 | CA2076066C Connecting apparatus for logging tools including electrical feedthrough and isolation system with bridle assembly |
| 06/10/1999 | WO1999028594A1 Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal |
| 06/10/1999 | WO1999028588A1 Method and apparatus for enhancing production from a wellbore hole |
| 06/10/1999 | WO1999027933A1 Inhibitors of farnesyl-protein transferase |
| 06/10/1999 | DE19748580C1 Combination geotechnical depth probe with detachable probe head |
| 06/10/1999 | CA2312361A1 Inhibitors of farnesyl-protein transferase |
| 06/09/1999 | EP0921269A1 Fail safe downhole signal repeater |
| 06/09/1999 | EP0788578B1 2-stage underreamer |
| 06/09/1999 | EP0712499A4 Improved slick line system with real-time surface display |
| 06/03/1999 | WO1999027230A2 Method for locating placement of a guide stock in a multilateral well and apparatus therefor |
| 06/03/1999 | WO1999027224A1 Inflatable packer inflation verification system |
| 06/02/1999 | EP0919697A2 Electromagnetic-to-acoustic and acoustic-to-electromagnetic repeaters and methods for use of same |
| 06/02/1999 | EP0919696A2 Electromagnetic and acoustic repeater and method for use of same |
| 06/02/1999 | EP0918920A1 Method and apparatus for providing a magnetic direction reference |
| 06/02/1999 | EP0918919A1 Logging method |
| 06/02/1999 | CN2322125Y Metal jacket petroleum echo shell |
| 06/02/1999 | CN2321941Y Well-testing vehicle dropping fishing layered tester |
| 05/26/1999 | EP0918136A1 Adjacent well telemetry system and method for use of the same |
| 05/26/1999 | EP0836667A4 Locating a discrete in-ground boring device |
| 05/25/1999 | US5907242 Balanced passive bandpass filter and preamplifier for a receiver |
| 05/25/1999 | US5907131 Method and system for cement bond evaluation high acoustic velocity formations |
| 05/25/1999 | US5906238 Downhole flow control devices |
| 05/20/1999 | WO1998053173A3 Improvements relating to strata logging on computer |
| 05/19/1999 | EP0916807A2 Pressure pulse generator for measurement-while-drilling systems which produces high signal strength and exhibits high resistance to jamming |
| 05/19/1999 | EP0916101A2 Combined electric-field telemetry and formation evaluation method and apparatus |
| 05/19/1999 | EP0916015A2 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 05/18/1999 | US5905036 Characterization of organic contaminants and assessment of remediation performance in subsurface formations |
| 05/18/1999 | US5904210 Apparatus and method for detecting a location and an orientation of an underground boring tool |
| 05/14/1999 | WO1999023355A1 Coiled tubing sensor system for delivery of distributed multiplexed sensors |
| 05/11/1999 | US5903306 Constrained space camera assembly |
| 05/11/1999 | US5901795 Well collision avoidance |
| 05/08/1999 | CA2249514A1 Method and apparatus for monitoring subterranean gas migration from wells |
| 05/06/1999 | WO1999022114A1 Method and apparatus for shutting in a well while leaving drill stem in the borehole |
| 05/06/1999 | WO1998059220A3 Measurement of flow fractions, flow velocities, and flow rates of a multiphase fluid using esr sensing |
| 05/06/1999 | EP0913555A2 Electromagnetic signal pickup device |
| 05/06/1999 | EP0913553A1 Plug release indication method in a well |
| 05/06/1999 | EP0913552A2 Method and apparatus for establishing a borehole parallel to an existing underground cable |
| 05/05/1999 | CN2317307Y Sperial-purpose device for checking packer tightness of water injection well |
| 05/05/1999 | CN1215791A Non-annulus pressure liquid level deep investgation apparatus for oil well |
| 05/05/1999 | CN1215789A Well system |
| 05/04/1999 | US5900544 System and method for detecting upward growth of a hydraulic subterranean fracture in real time |
| 05/04/1999 | US5899958 Logging while drilling borehole imaging and dipmeter device |
| 05/04/1999 | US5899283 Drill bit for horizontal directional drilling of rock formations |
| 04/29/1999 | WO1999020869A2 Equalizing subsurface safety valve with injection system |
| 04/29/1999 | CA2250666A1 Method and apparatus for achieving parallel cable boring |
| 04/28/1999 | EP0911484A2 Electromagnetic signal repeater and method for use of same |
| 04/28/1999 | EP0911483A2 Well system including composite pipes and a downhole propulsion system |
| 04/28/1999 | EP0910725A1 Wellbores utilizing fiber optic-based sensors and operating devices |
| 04/27/1999 | US5898517 Optical fiber modulation and demodulation system |
| 04/27/1999 | US5896939 Downhole measurement of depth |
| 04/27/1999 | US5896925 Tool protection guide |
| 04/24/1999 | CA2225657A1 Control apparatus and method for controlling the rate of liquid removal from a gas or oil well with a progressive cavity pump |
| 04/22/1999 | WO1999019751A1 Method and apparatus for drill stem data transmission |
| 04/22/1999 | WO1999019653A1 Composite spoolable tube with sensor |
| 04/22/1999 | WO1999019594A1 Oil tool |
| 04/22/1999 | CA2305161A1 Method and apparatus for drill stem data transmission |
| 04/21/1999 | CN2315296Y Testing wellhead trigger for oil well liquid level depth |
| 04/21/1999 | CN2315295Y Intelligent stratified water detection and pressure measuring device |
| 04/21/1999 | CN1214756A Method and sytsem for monitoring characteristic of earth formation in well |
| 04/21/1999 | CN1214754A Method of assaying downhole occurrences and conditions |
| 04/20/1999 | CA2084836C Shock isolation sub for use with downhole explosive actuated tools |
| 04/15/1999 | WO1999018322A2 Charge assembly for a pipe-coupling cutting device |
| 04/15/1999 | WO1999000575A3 Drilling system with sensors for determining properties of drilling fluid downhole |
| 04/14/1999 | EP0908600A2 Formation testing apparatus |
| 04/14/1999 | CN2314094Y Slips |
| 04/14/1999 | CN2314093Y Automatically selective three phase oil well metering instrument |
| 04/14/1999 | CN2314092Y Photoelectrical detector for motor pumped well |
| 04/14/1999 | CN2314090Y Protector for mechanical manometers |
| 04/08/1999 | WO1999005478A3 Flow measurement mandrel |
| 04/07/1999 | EP0906491A1 Method and apparatus for testing, completing and/or maintaining wellbores using a sensor device |
| 04/07/1999 | EP0906487A1 A system for directional control of drilling |
| 04/07/1999 | CN2313040Y Internal-external pressure recording instrument for oil pipe at the moment of being cracked by pressing |
| 04/07/1999 | CN1213043A Method and apparatus for enhancing pump-off controller performance |
| 04/07/1999 | CN1042859C Apparatus for testing shear thickening plugging fluid |
| 04/06/1999 | US5892733 Method and apparatus for installing electronic equipment below soft earth surface layer |
| 04/06/1999 | US5892148 Method of leak testing an underground fluid-storage cavity |
| 04/06/1999 | US5892147 Method for the determination of inflow of oil and/or gas into a well |
| 04/01/1999 | WO1999015756A2 Multi-well computerized control of fluid pumping |
| 04/01/1999 | CA2304775A1 Multi-well computerized control of fluid pumping |
| 03/31/1999 | EP0905351A2 Downhole signal source Location |
| 03/31/1999 | CN1212319A Cross-borehole high-temp tracer technique of viscous crude field |