发明名称 |
Temperature compensated magnetic field apparatus for NMR measurements |
摘要 |
An apparatus is disclosed for generating a magnetic field of high field strength, spatial uniformity and minimal drift of magnetic field intensity over a temperature range of about 0° C. to 175° C. This apparatus may be used in a standard modular logging tool for direct downhole NMR measurements of various parameters of fluid samples of geologic formations near the walls of a borehole. In one embodiment, the apparatus is composed of two tubular permanent magnets made of different magnetic materials with different magnetic temperature coefficients to provide temperature compensation. The apparatus preferably also utilizes a pressure barrel that surrounds the magnets and provides a return path for magnetic flux lines, thereby increasing flux density within the measurement volume.
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申请公布号 |
US6577125(B2) |
申请公布日期 |
2003.06.10 |
申请号 |
US20000739468 |
申请日期 |
2000.12.18 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
PRAMMER MANFRED G.;MASAK PETER |
分类号 |
G01R33/28;G01V3/32;(IPC1-7):G01V3/00 |
主分类号 |
G01R33/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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