Patent ID: 9469599
Filing Date: 2016-10-18
CPC Classification: B82Y,C01B,C07C,C07H,C09K,E21B,Y10S,Y10T

Claim Text:
1. A method for the preparation of a fluorescent nanoagent for use in a subsurface petroleum reservoir, the method comprising the steps of: heating an aqueous solution comprising sugar under high pressure at a temperature of at least 150° C. for at least 4 hours; adding an amino alcohol to the solution and refluxing the resulting mixture for a period of at least 10 hours, collecting a solid product comprising carbon-based nanoparticles having fluorescent functional groups attached to the surface thereof, wherein the fluorescent nanoagent further comprises an organic functional group present in an amount of between 50% and 90% by weight.