Methods for producing oil and/or gas

Abstract

A method for producing oil from an underground formation comprising injecting an enhanced oil recovery formulation into a first well in the formation, the enhanced oil recovery formulation comprising a foam; floating the foam on top of the oil, in order to force the oil towards a second well in the formation; and producing the oil and/or gas from the second well.

1 . A method for producing oil from an underground formation comprising:
 injecting an enhanced oil recovery formulation into a first well in the formation, the enhanced oil recovery formulation comprising a foam;   floating the foam on top of the oil, in order to force the oil towards a second well in the formation; and   producing the oil and/or gas from the second well.   
     
     
         2 . The method of  claim 1 , wherein the first well further comprises a first array of wells, and the second well further comprises a second array of wells, wherein a well in the first array of wells is at a distance of 10 meters to 1 kilometer from one or more adjacent wells in the second array of wells. 
     
     
         3 . The method of  claim 1 , wherein the underground formation is beneath a body of water. 
     
     
         4 . The method of  claim 1 , wherein the foam is injected into one or more fractures in the formation. 
     
     
         5 . The method of  claim 1 , further comprising injecting a second enhanced oil recovery formulation into the formation, the second enhanced oil recovery formulation being denser than the oil, further comprising floating the oil on the second enhanced oil recovery formulation. 
     
     
         6 . The method of  claim 2 , wherein the first array of wells comprises from 5 to 500 wells, and the second array of wells comprises from 5 to 500 wells. 
     
     
         7 . The method of  claim 1 , wherein the enhanced oil recovery formulation comprises gas and a surfactant. 
     
     
         8 . The method of  claim 1 , wherein the enhanced oil recovery formulation comprises a gas selected from the group consisting of nitrogen, carbon dioxide, natural gas, and hydrocarbon gases other than natural gas having from one to four carbon atoms. 
     
     
         9 . The method of  claim 5 , wherein the second enhanced oil recovery formulation comprises a carbon disulfide formulation. 
     
     
         10 . The method of  claim 1 , wherein the underground formation comprises an oil having a viscosity from 100 to 5,000,000 centipoise. 
     
     
         11 . The method of  claim 1 , wherein the enhanced oil recovery formulation is less dense than the oil. 
     
     
         12 . The method of  claim 1 , wherein the oil floats on the enhanced oil recovery formulation.