Multicolor fluorescent silica nanoparticles as tracers for production and well monitoring
US10480313B2 · kind B2 · utility
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22Claims
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Key dates
| Filing date | Jun 19, 2017 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | Dec 1, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of determining a property within a subterranean formation comprises introducing silica nanoparticles into a well; obtaining a sample of a fluid produced from the well; and analyzing the sample for presence of the silica nanoparticles, wherein the silica nanoparticles comprise a core, a donor chromophore, an acceptor chromophore, and an outer silica shell; the donor chromophore and the acceptor chromophore being selected such that an emission spectrum of the donor chromophore overlaps with an absorption spectrum of the acceptor chromophore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.