Patent US4147744A successfully refreshed from Google Patents.
Patent US3139528A successfully refreshed from Google Patents.
US3139528A
Expired / Lapsed
US
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Neutron-gamma ray well logging device for distinguishing between shale and sandstone
Assignee: Schlumberger Well Surveying Corp
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Filing: 1959-04-10
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Granted: 1964-06-30
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Expires: 1979-04-10
Abstract
No abstract record available.
Inventors
- 👤 Johnson Frank Fawcett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:56
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A METHOD FOR DETERMINING THE TYPE OF FORMATION THROUGH WHICH A BOREHOLE PASSES COMPRISING IRRADIATING THE FORMATION WITH NEUTRONS, DETECTING GAMMA RAYS FROM THE FORMATION AND GENERATING CORRESPONDING ELECTRICAL SIGNALS REPRESENTING THE ENERGIES OF THE DETECTED GAMMA RAYS, MEASURING THE INTENSITY OF SIGNALS CORRESPONDING TO GAMMA RAYS RESULTING FROM NEUTRON CAPTURE BY NUCLEI OF A FIRST ELEMENT HAVING HIGHER CONCENTRATION IN ONE TYPE OF FORMATION THAN IN OTHERS, MEASURING THE INTENSITY OF SIGNALS CORRESPONDING TO GAMMA RAYS RESULTING FROM NEUTRON CAPTURE BY NUCLEI OF ANOTHER ELEMENT, CHEMICALLY DIFFERENT FROM THE FIRST ELEMENT, HAVING LOWER CONCENTRATION IN THAT TYPE OF FORMATION THAN IN OTHER TYPES OF FORMATIONS, AND COMPARING THE TWO INTENSITIES.
Claim 2
Independent Claim
111 words
A METHOD FOR DETERMINING THE TYPE OF FORMATION THROUGH WHICH A BOREHOLE PASSES COMPRISING IRRADIATING THE FORMATION WITH NEUTRONS, DETECTING GAMMA RAYS FROM THE FORMATION AND GENERATING CORRESPONDING ELECTRICAL SIGNALS REPRESENTING THE ENERGIES OF THE DETECTED GAMMA RAYS, MEASURING THE INTENSITY OF SIGNALS CORRESPONDING TO GAMMA RAYS RESULTING FROM NEUTRON CAPTURE BY NUCLEI OF A FIRST ELEMENT HAVING HIGHER CONCENTRATION IN ONE TYPE OF FORMATION THAN IN OTHERS, MEASURING THE INTENSITY OF SIGNALS CORRESPONDING TO GAMMA RAYS RESULTING FROM NEUTRON CAPTURE BY NUCLEI OF ANOTHER ELEMENT, CHEMICALLY DIFFERENT FROM THE FIRST ELEMENT, HAVING LOWER CONCENTRATION IN THAT TYPE OF FORMATION THAN IN OTHER TYPES OF FORMATIONS, AND COMPARING THE TWO INTENSITIES.
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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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |