Patent ID: 8877506

Claim:
A method of interrogation of a reservoir penetrated by an injection borehole and penetrated by a recovery borehole wherein the reservoir has a predetermined temperature, comprising the steps of: encapsulating a tracer in a receptacle wherein said receptacle has a surface layer made of a polymer wherein said polymer is made of polymerizable or crosslink-able materials that will erode or degrade upon encountering the predetermined temperature, said step of encapsulating a tracer in a receptacle including directing a first fluid containing said tracer through a round injection tube into a second fluid containing said polymer so that a droplet of said first fluid containing said tracer is formed in said second fluid containing said polymer wherein said second fluid containing said polymer forms said surface layer around said droplet and produces said receptacle, injecting said receptacle and said tracer into the reservoir through the injection borehole wherein said polymer surface layer erodes or degrades upon encountering the predetermined temperature releasing said tracer into the reservoir, recovering said tracer from said reservoir through the recovery borehole, and analyzing said tracer for reservoir interrogation.