US3528000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear resonance well logging method and apparatus
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1954-03-05
•
Granted: 1970-09-08
•
Expires: 1974-03-05
Abstract
No abstract record available.
Inventors
- 👤 Harold F Schwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:11
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A METHOD FOR INVESTIGATING A WELL DRILLED INTO THE EARTH, THE STEPS OF SUBJECTING NUCLEI HAVING MAGNETIC PROPERTIES AND COMPRISING MATERIAL AT A SELECTED LEVEL IN A WELL TO A FIRST UNIDIRECTIONAL MAGNETIC FIELD, SIMULTANEOUSLY SUBJECTING SAID NUCLEI TO AN ALTERNATING MAGNETIC FIELD DIRECTED AT AN ANGLE TO SAID FIRST FIELD, SWEEPING THE AMPLITUDE OF SAID FIRST FIELD AT A FIRST RELATIVELY LOW FREQUENCY THROUGH A RANGE INCLUDING AT LEAST ONE VALUE FOR WHICH LARMOR PRECESSION OF SELECTED NUCLEI WILL BE SUSTAINED, SUPERIMPOSING ON SAID FIRST SWEEP A SECOND AMPLITUDE SWEEP OF RELATIVELY SMALL AMPLITUDE AND RELATIVELY HIGH FREQUENCY, PROVIDING A SIGNAL REPRESENTATIVE OF LARMOR PRECESSION OF NUCLEI, AND OBTAINING INDICATIONS OF SAID SIGNAL.
Claim 2
Dependent Claim
115 words
IN A METHOD FOR INVESTIGATING A WELL DRILLED INTO THE EARTH, THE STEPS OF SUBJECTING NUCLEI HAVING MAGNETIC PROPERTIES AND COMPRISING MATERIAL AT A SELECTED LEVEL IN A WELL TO A FIRST UNIDIRECTIONAL MAGNETIC FIELD, SIMULTANEOUSLY SUBJECTING SAID NUCLEI TO AN ALTERNATING MAGNETIC FIELD DIRECTED AT AN ANGLE TO SAID FIRST FIELD, SWEEPING THE AMPLITUDE OF SAID FIRST FIELD AT A FIRST RELATIVELY LOW FREQUENCY THROUGH A RANGE INCLUDING AT LEAST ONE VALUE FOR WHICH LARMOR PRECESSION OF SELECTED NUCLEI WILL BE SUSTAINED, SUPERIMPOSING ON SAID FIRST SWEEP A SECOND AMPLITUDE SWEEP OF RELATIVELY SMALL AMPLITUDE AND RELATIVELY HIGH FREQUENCY, PROVIDING A SIGNAL REPRESENTATIVE OF LARMOR PRECESSION OF NUCLEI, AND OBTAINING INDICATIONS OF SAID SIGNAL.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-07 | 1974-03-09 | 1974-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-07 | 1978-03-09 | 1978-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-07 | 1982-03-09 | 1982-09-08 | $7700.00 | Window Closed / Lapsed |