FR2185801A1 - Nuclear magnetism well logging - by establishing free precession of chosen nuclei - Google Patents
Nuclear magnetism well logging - by establishing free precession of chosen nucleiInfo
- Publication number
- FR2185801A1 FR2185801A1 FR7218885A FR7218885A FR2185801A1 FR 2185801 A1 FR2185801 A1 FR 2185801A1 FR 7218885 A FR7218885 A FR 7218885A FR 7218885 A FR7218885 A FR 7218885A FR 2185801 A1 FR2185801 A1 FR 2185801A1
- Authority
- FR
- France
- Prior art keywords
- field
- nuclei
- chosen
- well logging
- nuclear magnetism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/32—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electron or nuclear magnetic resonance
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
A nuclear magnetism well logging tool simultaneously establishes a strong DC magnetic field, to polarise chosen nuclei, and an AC magnetic field in a direction at right-angles to the earth's field and at a frequency corresponding to the Larmor precession frequency of the chosen nuclei. By terminating the DC field adiabatically over a period less than the thermal relaxation time of the chosen nuclei, the latter are swept into driven resonance in the AC field and when that field is then abruptly terminated the nuclei precess freely about the earth's magnetic field and a characteristic of the free precession is monitored.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7218885A FR2185801A1 (en) | 1972-05-26 | 1972-05-26 | Nuclear magnetism well logging - by establishing free precession of chosen nuclei |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7218885A FR2185801A1 (en) | 1972-05-26 | 1972-05-26 | Nuclear magnetism well logging - by establishing free precession of chosen nuclei |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2185801A1 true FR2185801A1 (en) | 1974-01-04 |
FR2185801B1 FR2185801B1 (en) | 1975-03-28 |
Family
ID=9099160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7218885A Granted FR2185801A1 (en) | 1972-05-26 | 1972-05-26 | Nuclear magnetism well logging - by establishing free precession of chosen nuclei |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2185801A1 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3275931A (en) * | 1962-09-10 | 1966-09-27 | Phillips Petroleum Co | Method of nuclear magnetic resonance well logging |
US3479579A (en) * | 1966-12-06 | 1969-11-18 | Schlumberger Technology Corp | Nuclear magnetism signal analyzing system |
-
1972
- 1972-05-26 FR FR7218885A patent/FR2185801A1/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3275931A (en) * | 1962-09-10 | 1966-09-27 | Phillips Petroleum Co | Method of nuclear magnetic resonance well logging |
US3479579A (en) * | 1966-12-06 | 1969-11-18 | Schlumberger Technology Corp | Nuclear magnetism signal analyzing system |
Also Published As
Publication number | Publication date |
---|---|
FR2185801B1 (en) | 1975-03-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |