US2778951A
Expired / Lapsed
US
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Neutron logging method and apparatus
Assignee: Schlumberger Well Surveying Corp
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Filing: 1952-12-12
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Granted: 1957-01-22
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Expires: 1972-12-12
Abstract
No abstract record available.
Inventors
- 👤 Tittman Jay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/107
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
142 words
NEUTRON LOGGING APPARATUS FOR INVESTIGATING FORMATIONS TRAVERSED BY A BOREHOLE CONTAINING HYDROGENOUS FLUID COMPRISING A DETECTOR RESPONSIVE TO LOW ENERGY NEUTRONS, A LOW ENERGY NEUTRON SHIELD SURROUNDING SAID DETECTOR WITH THE EXCEPTION OF WINDOW MEANS FACING THE WALL OF THE BOREHOLE, A SOURCE OF HIGH ENERGY NEUTRONS LOCATED IN PREDETERMINED RELATION TO SAID DETECTOR, SAID SOURCE AND SAID DETECTOR BEING SO RELATED THAT THE LATTER DETECTS LOW ENERGY NEUTRONS RECEIVED SUBSTANTIALLY ONLY THROUGH A ZONE IN CONTACT WITH THE WALL OF THE BOREHOLE THROUGH WHICH HIGH ENERGY NEUTRONS FROM SAID SORUCE ARE RADIATED INTO THE SURROUNDING FORMATIONS, MEANS FOR FORCING SAID DETECTOR AND SAID SOURCE TOWARD THE WALL OF THE BOREHOLE, AND A PAD OF MATERIAL SUBSTANTIALLY TRANSPARENT TO NEUTRONS IN THE SPACE BETWEEN THE WINDOW MEANS OF SAID DETECTOR AND THE BOREHOLE WALL FOR DISPLACING THE HYDROGENOUS FLUID FROM SAID SPACE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |