Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-12-23
2000-08-29
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324307, G01V 300
Patent
active
061114081
ABSTRACT:
A method and apparatus are disclosed for using nuclear magnetic resonance (NMR) techniques to obtain information relating to fluids present near geologic structures. A modular NMR tester which can be located within a standard modular logging tool is used for direct downhole NMR measurements of various parameters of fluid samples of geologic formations near the walls of a borehole. The tester has a vessel made of a non-conductive material and a surrounding permanent magnet that creates a uniform static magnetic field within the test chamber of the vessel. An RF coil is embedded in the walls of the vessel and is used to induce excitation field with a direction perpendicular to the static magnetic field. Fluids located proximate the borehole are introduced into a test chamber of the tester. NMR signals from the excited nuclei in the fluids are detected to obtain data for calculating a number of important fluid parameters and for the interpretation of wireline MRIL measurements.
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Blades Thomas
Prammer Manfred
Fetzner Tiffany A.
Numar Corporation
Oda Christine K.
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