Enhanced oil recovery using carbonated water and two salt solutions

Abstract

A method of enhancing recovery of hydrocarbons from a formation includes providing a carbonated fluid, reacting a first salt solution with a second salt solution to provide heat, displacing carbon dioxide from the carbonated fluid, sweeping the formation with the displaced carbon dioxide, mixing the displaced carbon dioxide with at least a portion of the hydrocarbons in the vertical regions, thereby producing a mixture, and producing the mixture via a production well in the formation, thereby enhancing recovery of the hydrocarbons from the formation. A system for controlling the release of carbon dioxide from carbonated water and enhancing oil recovery from a hydrocarbon bearing formation includes an injection system in fluid communication with an injection well that is in fluid communication with a production well via a hydraulic connection.

1 - 15 . (canceled) 
     
     
         16 . A system for controlling a release of carbon dioxide from carbonated water and enhancing oil recovery from a hydrocarbon bearing formation, the system comprising:
 an injection system in fluid communication with an injection well, wherein the injection well is in fluid communication with a production well via a hydraulic connection, wherein the injection well and the production well are disposed in a same geologic formation or in different geologic formations;   a carbonated fluid;   a first salt solution; and   a second salt solution,   wherein the second salt solution is capable of reaction with the first salt solution upon contact under injection conditions and under conditions in the formation.   
     
     
         17 . The system of  claim 16 , wherein the first salt solution comprises an ammonium-based compound. 
     
     
         18 . The system of  claim 16 , wherein the second salt solution comprises a sodium salt. 
     
     
         19 . The system of  claim 16 , wherein the carbonated fluid comprises carbon dioxide and a first aqueous fluid. 
     
     
         20 . The system of  claim 16 , wherein the carbonated fluid has a density greater than an aqueous fluid of the formation.