Method for determining density of an earth formation
US5804820A · kind A · utility
78Cited by
17References
22Claims
0Family size
Assignees
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Key dates
| Filing date | Mar 4, 1997 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Mar 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for determining the density of underground formations surrounding a borehole, such as a wireline logging tool or a logging-while-drilling tool, includes a neutron source for irradiating the formations from within the borehole and at least one detector which detects neutrons and gamma rays in the borehole resulting from the irradiation of the formations with neutrons. Multiple detectors can also be used to separately detect neutrons and gamma rays. Detected neutron and gamma ray signals are each analyzed and combined to determine the density of an earth formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.