US 12,110,448 B2
Multifunctional fluorescent tags for subterranean applications
Wei Wang, Quincy, MA (US); Hooisweng Ow, Woburn, MA (US); and Sehoon Chang, Boston, MA (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Nov. 9, 2021, as Appl. No. 17/522,437.
Prior Publication US 2023/0141596 A1, May 11, 2023
Int. Cl. C09K 8/24 (2006.01); C09K 8/16 (2006.01); C09K 11/02 (2006.01); C09K 11/06 (2006.01); C09K 11/68 (2006.01); C09K 11/77 (2006.01); E21B 49/00 (2006.01); E21B 49/02 (2006.01)
CPC C09K 8/24 (2013.01) [C09K 8/16 (2013.01); C09K 11/025 (2013.01); C09K 11/06 (2013.01); C09K 11/684 (2013.01); C09K 11/7773 (2013.01); E21B 49/005 (2013.01); E21B 49/02 (2013.01); C09K 2208/10 (2013.01); C09K 2211/182 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A nanoparticle tag, comprising:
a fluorescent core, wherein the fluorescent core comprises an up-converting material; and
a polymer shell, wherein the polymer shell comprises styrene-based monomers or methacrylate-based monomers, or any combination thereof, and wherein the polymer shell comprises monomer fingerprint information.