| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 12/21/1999 | US6004639 Suitable for use in the oil industry, |
| 12/21/1999 | US6003620 Downhole in-situ measurement of physical and or chemical properties including fluid saturations of cores while coring |
| 12/21/1999 | US6003597 Directional coupling sensor for ensuring complete perforation of a wellbore casing |
| 12/21/1999 | US6003365 Characterization of organic contaminants and assessment of remediation performance in subsurface formations |
| 12/16/1999 | WO1999064720A1 Method for magnetic survey calibration and estimation of uncertainty |
| 12/16/1999 | WO1999064712A1 Directional drilling system and apparatus |
| 12/15/1999 | EP0964134A2 Power and signal transmission using insulated conduit for permanent downhole installations |
| 12/15/1999 | EP0964133A1 Transmitter housing |
| 12/15/1999 | EP0963644A1 An apparatus, system and method to transmit and display acquired well data in near real time at a remote location |
| 12/15/1999 | CN2353888Y State sealing mechanism for cabin of caliper log |
| 12/15/1999 | CN2353887Y Caliper-log connection tube |
| 12/14/1999 | US6002643 Pulser |
| 12/14/1999 | US6002258 Method for locating a boring tool |
| 12/14/1999 | US6002257 Method and apparatus for well bore hole-finding with simultaneous borehole or formation sensing |
| 12/14/1999 | US6001280 Oil-soluble tracer solutions containing gadolinium compounds |
| 12/14/1999 | US6000470 Self-locking connector |
| 12/14/1999 | US6000468 Method and apparatus for the downhole metering and control of fluids produced from wells |
| 12/14/1999 | CA2047881C Dynamometric measurement assembly with radio transmission means for drilling rods |
| 12/09/1999 | WO1999063202A1 Method and arrangement for monitoring well related parameters |
| 12/09/1999 | DE19823629A1 Gehäuse zur Senderaufnahme Housing for receiving stations |
| 12/08/1999 | CN1047237C Carbon/oxygen energy spectrum logging system |
| 12/07/1999 | US5996711 Method and apparatus for locating indexing systems in a cased well and conducting multilateral branch operations |
| 12/07/1999 | US5996697 Static wellhead plug |
| 12/07/1999 | US5996696 Method and apparatus for testing the integrity of oil delivery tubing within an oil well casing |
| 12/07/1999 | CA2200638C Acoustic pulse gun assembly |
| 12/07/1999 | CA2127476C Logging or measurement while tripping |
| 12/07/1999 | CA2014875C Logging method and apparatus for acoustic inspection of a borehole fitted with casing |
| 12/02/1999 | WO1999061746A1 Generating commands for a downhole tool |
| 12/01/1999 | EP0961008A2 Apparatus and method for drilling and completing a deviated borehole |
| 12/01/1999 | EP0960261A1 Tool and method for drilling a lateral well |
| 12/01/1999 | CN2351553Y Small-diameter noise logging instrument |
| 12/01/1999 | CN2351552Y Hydraulic throwing and draging stratified manometry and seal-testing detecting instrument |
| 12/01/1999 | CN2351551Y High-resolution double-lateral log equipment electrode system |
| 12/01/1999 | CN1236860A Apparatus and method for determining drilling mode to optimize formation evaluation measurements |
| 12/01/1999 | CN1236859A Clamping band for collecting vibration signals of drilling rod |
| 11/30/1999 | US5995449 Method and apparatus for improved communication in a wellbore utilizing acoustic signals |
| 11/30/1999 | US5995020 Downhole power and communication system |
| 11/30/1999 | US5994904 Method and apparatus for monitoring the relative position of a cable boring head during a boring operation |
| 11/30/1999 | US5992543 Core drilling latch assembly |
| 11/30/1999 | US5992524 Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access |
| 11/30/1999 | US5992519 Real time monitoring and control of downhole reservoirs |
| 11/30/1999 | US5992250 Apparatus for the remote measurement of physical parameters |
| 11/30/1999 | US5992228 Method for determining resistivity derived porosity and porosity derived resistivity |
| 11/25/1999 | WO1999060250A1 Method for installing a sensor in connection with plugging a well |
| 11/25/1999 | WO1999060249A1 Imaging sensor |
| 11/25/1999 | WO1999031344A3 Miniature directional indication instrument |
| 11/25/1999 | CA2329009A1 Method for installing a sensor in connection with plugging a well |
| 11/24/1999 | CN2350525Y Universal joint pivoted wired while-drilling apparatus |
| 11/23/1999 | US5991602 Method of and system for communication between points along a fluid flow |
| 11/23/1999 | US5990683 Method and arrangement for locating a boring tool using a three-antennae vector sum |
| 11/23/1999 | US5990682 Method for determining the depth of an in-ground boring tool |
| 11/23/1999 | US5990050 Useful in the drilling, completing and working over of subterranean wells, such as oil wells; continuous phase propylene glycol n-butyl ether(s) having viscosity less than 10 centipoise at 25 degrees c and stabilizing emulsifier |
| 11/23/1999 | US5988300 Composite material structures having reduced signal attenuation |
| 11/23/1999 | US5988277 Running tool for static wellhead plug |
| 11/18/1999 | WO1999059002A2 System and process for optimizing gravity gradiometer measurements |
| 11/18/1999 | WO1999058933A1 Apparatus for measuring magnetic declination using gps |
| 11/18/1999 | WO1999058816A1 System and process for secondary hydrocarbon recovery |
| 11/18/1999 | WO1999058809A2 Coupling with shape-memory material, disconnecting tool with a piston and coupling with valves |
| 11/17/1999 | CN2349348Y Instrument for surveying leak off rate and thief zone |
| 11/17/1999 | CN1235236A Permanent magnet for NMR logging instrument |
| 11/16/1999 | US5987385 Method and apparatus for creating an image of an earth borehole or a well casing |
| 11/16/1999 | US5984023 Downhole in-situ measurement of physical and or chemical properties including fluid saturations of cores while coring |
| 11/16/1999 | US5984013 Plunger arrival target time adjustment method using both A and B valve open times |
| 11/16/1999 | US5984009 Logging tool retrieval system |
| 11/16/1999 | US5983716 Method and measuring device for measuring hydrostatic pressure, in particular that of ground water |
| 11/11/1999 | WO1999057417A2 Chemical actuation system for downhole tools and method for detecting failure of an inflatable element |
| 11/10/1999 | EP0955444A2 Method and apparatus for installing a house service connection using directional drilling |
| 11/10/1999 | EP0955443A1 Moling Apparatus |
| 11/09/1999 | US5983164 Method and apparatus for measuring and controlling the flow of natural gas from gas wells |
| 11/09/1999 | US5979588 Method and apparatus for installing electronic equipment below soft earth surface layer |
| 11/09/1999 | US5979570 Surface controlled wellbore directional steering tool |
| 11/09/1999 | US5979553 Method and apparatus for completing and backside pressure testing of wells |
| 11/04/1999 | WO1999056155A1 Acoustic logging tool |
| 11/03/1999 | EP0953726A1 Apparatus and method for wellbore testing of formation fluids using acoustic signals |
| 11/02/1999 | US5978739 Disconnect information and monitoring system for dynamically positioned offshore drilling rigs |
| 11/02/1999 | US5975204 Method and apparatus for the remote control and monitoring of production wells |
| 10/28/1999 | WO1999054591A1 Controlling multiple downhole tools |
| 10/27/1999 | EP0952302A2 Downhole force generator |
| 10/27/1999 | CA2705595A1 Whipstock, running/retrieval tool and a system for tieing back a liner from a wellbore casing |
| 10/26/1999 | US5972966 And the farnesylation of the oncogene protein ras |
| 10/21/1999 | WO1999053172A1 Orienting downhole tools |
| 10/21/1999 | WO1999052648A1 Methods and computer executable instructions for marking a downhole elongate line and detecting same |
| 10/20/1999 | CN2344544Y Sidewall contact hole diameter microelectrode combined logging instrument |
| 10/19/1999 | US5969242 Isobaric groundwater well |
| 10/19/1999 | US5969241 Method and apparatus for measuring formation pressure |
| 10/19/1999 | US5967231 Plug release indication method |
| 10/13/1999 | EP0948703A2 Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch |
| 10/13/1999 | EP0948700A2 Whipstock |
| 10/13/1999 | CN2343341Y Inserted pressure type anti-theft pressure-meter |
| 10/13/1999 | CN1231378A Application of polyarontether thermoplastic plastic in downhole instrument |
| 10/12/1999 | US5965810 Method for determining sedimentary rock pore pressure caused by effective stress unloading |
| 10/12/1999 | US5964530 Method for compensating earth surface temperatures for the skyward effect thereon |
| 10/12/1999 | US5964306 Auger earth boring machine with improved efficiency and safety |
| 10/12/1999 | US5964296 Formation fracturing and gravel packing tool |
| 10/07/1999 | WO1999050528A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 10/07/1999 | WO1999038315A3 Method to transmit downhole video up standard wireline cable using digital data compression techniques |
| 10/06/1999 | EP0706668B1 Instant acoustic logging method for well bores |
| 10/06/1999 | CN2342096Y Hydraulic compressing well seal tester |
| 10/05/1999 | US5963138 Apparatus and method for self adjusting downlink signal communication |
| 10/05/1999 | US5963037 Method for generating a flow profile of a wellbore using resistivity logs |