NMR logging in formation with micro-porosity by using first echoes from multiple measurements
US10466381B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 2015 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Jun 8, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/088
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for estimating a property of a subsurface material includes: conveying a carrier through a borehole penetrating the subsurface material; performing at least two magnetic resonance (NMR) measurements in a volume of interest in the subsurface material using an NMR tool disposed on the carrier, wherein (i) a first NMR measurement has a first wait time and a first first-echo time and a second NMR measurement has a second wait time and a second first-echo time, (ii) the first wait time and the second wait time are less than or equal to 500 milliseconds, and (iii) the first first-echo time and the second first-echo time are different; receiving at least the first-echo of the first NMR measurement and receiving at least the first-echo of the second NMR measurement; and estimating the property of the subsurface material by using the at least two measured first-echoes simultaneously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.