发明名称 |
Nuclear magnetic resonance sensing apparatus and techniques for downhole measurements |
摘要 |
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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申请公布号 |
US6111408(A) |
申请公布日期 |
2000.08.29 |
申请号 |
US19970996716 |
申请日期 |
1997.12.23 |
申请人 |
NUMAR CORPORATION |
发明人 |
BLADES, THOMAS;PRAMMER, MANFRED |
分类号 |
G01R33/44;G01V3/32;(IPC1-7):G01V3/00 |
主分类号 |
G01R33/44 |
代理机构 |
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