Indicating barehole rugosity as a function of the difference between shallow and deep log indices
US4700300A · kind A · utility
4Cited by
2References
16Claims
0Family size
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Key dates
| Filing date | Jun 27, 1984 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Jun 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Statistical variations in simultaneous shallow and deep investigation nuclear borehole logs are reduced using digital moving average data processing while maintaining responsiveness to formation changes, by transitioning through a combination of long and short filtered data as a function of the statistical variation of the deep log data differences of the long and short derived averages. Borehole rugosity is also indicated as a function of the difference between the shallow and the deep log indexes of the differences between their respective narrow and wide derived averages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.