Viscosity determination from logarithmic mean ratio of relaxation times
US7511488B2 · kind B2 · utility
5Cited by
9References
18Claims
0Family size
Assignee
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Key dates
| Filing date | May 1, 2007 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Jul 20, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/448
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining viscosity, η, of a fluid downhole, calls for performing a nuclear magnetic resonance (NMR) survey of the fluid; determining a longitudinal relaxation time, T1, and an apparent transverse relaxation time, T2app, for the fluid; forming a ratio R of T1/T2app for the fluid; and determining the viscosity, η, according to the ratio, R. A computer program product for implementing the method is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.