Compensated caliper using combined acoustic and density measurements
US7596452B2 · kind B2 · utility
2Cited by
15References
23Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 10, 2007 |
| Grant date | Sep 29, 2009 |
| Priority date | — |
| Expiry date | Aug 10, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. An analytic function based on a heuristic model is used to predict the measured response as a function of offset, mud density and formation density. The model may be used to provide a caliper measurement where acoustic caliper data are unreliable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.