Patent US3566117A successfully refreshed from Google Patents.
US3566117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring technique
Assignee: Schlumberger Technology Corp
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Filing: 1968-01-05
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Granted: 1971-02-23
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Expires: 1988-01-05
Abstract
Abstract A specific embodiment of the invention provides a technique for measuring the matrix composition and gas saturation of an earth formation surrounding a borehole. These parameters may be measured by combining porosity dependent signals derived from two-detector neutron porosity tool with the bulk density-related signals from a two-detector gamma-gamma mudcake compensated density tool. The combined signals produce more accurate indications of matrix lithology and gas saturation.
Inventors
- 👤 Maurice P Tixier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:05
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/14; G01V5/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
An earth formation logging tool comprising, a housing, a gamma ray source a pair of gamma radiation detectors spaced from each other within said housing to produce signals in response to incident gamma radiation, a neutron source a pair of neutron detectors within said housing and spaced from each other and said gamma detectors for producing another signal, a third gamma ray detector within said housing for producing a signal in response to the natural formation radioactivity, and circuit means coupled to said signals for transmitting said detector signals from said housing, density circuit means for combining said gamma ray detector signals to establish a signal corresponding to the bulk density of the formation, porosity circuit means for combining said neutron detector signals to establish another signal related to the porosity of the formation, circuit means responsive to said density and porosity related signals to indicate the mineral composition of the earth formation, including circuit means responsive to said density and porosity related signals to indicate the mineral composition of the earth formation, and logic means for contrasting said density and porosity related signals to indicate the presence of gas within the formation.
Claim 2
Dependent Claim
193 words
An earth formation logging tool comprising, a housing, a gamma ray source a pair of gamma radiation detectors spaced from each other within said housing to produce signals in response to incident gamma radiation, a neutron source a pair of neutron detectors within said housing and spaced from each other and said gamma detectors for producing another signal, a third gamma ray detector within said housing for producing a signal in response to the natural formation radioactivity, and circuit means coupled to said signals for transmitting said detector signals from said housing, density circuit means for combining said gamma ray detector signals to establish a signal corresponding to the bulk density of the formation, porosity circuit means for combining said neutron detector signals to establish another signal related to the porosity of the formation, circuit means responsive to said density and porosity related signals to indicate the mineral composition of the earth formation, including circuit means responsive to said density and porosity related signals to indicate the mineral composition of the earth formation, and logic means for contrasting said density and porosity related signals to indicate the presence of gas within the formation.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |