Monitoring Injected Nonhydrocarbon And Nonaqueous Fluids Through Downhole Fluid Analysis

Abstract

A method of monitoring a nonhydrocarbon and nonaqueous fluid injected into the earth's subsurface through a first wellbore that involves positioning a fluid analysis tool within a second wellbore and determining the presence of the injected nonhydrocarbon and nonaqueous fluid by making a measurement downhole on the injected nonhydrocarbon and nonaqueous fluid using the fluid analysis tool. Also a related method of enhancing hydrocarbon production from a subsurface area having first and second wellbores that involves injecting a nonhydrocarbon and nonaqueous fluid into the subsurface through the first wellbore, positioning a fluid analysis tool within the second wellbore, and determining the presence of the injected nonhydrocarbon and nonaqueous fluid by making a measurement downhole on the injected nonhydrocarbon and nonaqueous fluid using the fluid analysis tool.

1 . A method of enhancing hydrocarbon production from a subsurface area having first and second wellbores comprising:
 injecting a nonhydrocarbon and nonaqueous fluid into the subsurface through said first wellbore;   positioning a fluid analysis tool within said second wellbore;   determining the presence of said injected nonhydrocarbon and nonaqueous fluid by determining fluid properties of said injected nonhydrocarbon and nonaqueous fluid using said fluid analysis tool; and   identifying a location within said second wellbore where fluids with relatively high concentrations of said injected nonhydrocarbon and nonaqueous fluid are entering said second wellbore.   
     
     
         2 . A method of enhancing hydrocarbon production from a subsurface area in accordance with  claim 1 , further comprising performing a treatment on said second wellbore. 
     
     
         3 . A method of enhancing hydrocarbon production from a subsurface area in accordance with  claim 2 , wherein said treatment inhibits fluid from entering said second wellbore at said identified location and flowing to the surface comprises installing one or more of a bridge plug, a packer, a casing patch, gel, or cement within said second wellbore. 
     
     
         4 . A method of enhancing hydrocarbon production from a subsurface area in accordance with  claim 2 , wherein said treatment enhances the production of fluid entering the wellbore from areas other than the identified location. 
     
     
         5 . A method of enhancing hydrocarbon production from a subsurface area in accordance with  claim 1 , further comprising modifying the rate at which fluid is being withdrawn from said second wellbore. 
     
     
         6 . A method of monitoring a nonhydrocarbon and nonaqueous fluid injected into the earth's subsurface through a first wellbore comprising:
 positioning a fluid analysis tool within a second wellbore;   determining the presence of said injected nonhydrocarbon and nonaqueous fluid by determining fluid properties of said injected nonhydrocarbon and nonaqueous fluid using said fluid analysis tool;   repositioning said fluid analysis tool at a different location within said second wellbore,   determining the presence of said injected nonhydrocarbon and nonaqueous fluid at said different location by making a measurement downhole on said injected nonhydrocarbon and nonaqueous fluid using said fluid analysis tool, and   comparing the measurements made at said different locations.   
     
     
         7 . A method of monitoring a nonhydrocarbon and nonaqueous fluid injected into the earth's subsurface through a first wellbore comprising:
 positioning a fluid analysis tool within a second wellbore; and   determining the presence of said injected nonhydrocarbon and nonaqueous fluid by making a measurement downhole comprising determining fluid properties of said injected nonhydrocarbon and nonaqueous fluid using said fluid analysis tool.