Diamondoids for monitoring & surveillance

Abstract

A downhole monitoring system for continuously measuring in real-time a fluid produced from a reservoir includes a tubing extending into a wellbore, spaced apart packers forming annular seals between the tubing and a wall of the wellbore, isolated compartments formed between the spaced apart packers, each compartment having an opening in the tubing to allow fluid communication from the reservoir to surface equipment, and an ultraviolet spectrometer installed in each compartment. The ultraviolet spectrometer includes an ultra-violet source that excites diamondoids, a photomultiplier to quantify the excited diamondoids, and an electronic circuit that digitizes a response from the photomultiplier and sends the response to the surface of the wellbore. Additionally, a method includes continuously monitoring and in real-time a fluid produced from a reservoir and determining reservoir connectivity and reservoir profiling.

1 .- 17 . (canceled) 
     
     
         18 . A method, comprising:
 dissolving deuterated diamondoids in a supercritical state of carbon dioxide CO 2 ;   injecting the deuterated diamondoids with CO 2  in an injection well;   detecting and monitoring a presence of the deuterated diamondoids from at least one of a downhole location in a production well or a surface location of the production well; and   determining reservoir connectivity between the injection well and the production well.   
     
     
         19 . The method of  claim 18 , wherein determining reservoir connectivity comprises comparing an amount of the deuterated diamondoids detected after the injection and an amount of diamondoids detected prior to the injection. 
     
     
         20 . The method of  claim 18 , further comprising injecting a second type of deuterated diamondoids in a second injection well and monitoring the presence of the second type of deuterated diamondoids to determine reservoir connectivity between the second injection well and the production well.