Aqueous solution for controlling bacteria in the water used for fracturing

Abstract

Methods and apparatus of embodiments of the invention relate to a system for treating a subterranean formation including mixing equipment to form a fluid comprising sodium hypochlorite and sodium diacetate; and pumps and a tubular to introduce the fluid into the subterranean formation, wherein a surface of the subterranean formation contains at least 15 percent less microorganisms than if no sodium hypochlorite were in the fluid. Methods and apparatus of embodiments of the invention relate to a method of producing a petroleum product from a wellbore including using a well treatment system comprising mixing equipment, pumps, and a tubular, forming a fluid comprising sodium hypochlorite and sodium diacetate; and introducing the fluid to the well treatment system to achieve a reduced population of microorganisms in the system. Methods and apparatus of embodiments of the invention relate to a system, comprising: a subterranean formation, a well treatment apparatus comprising mixing equipment, pumps, and a tubular, and a fluid comprising sodium hypochlorite and sodium diacetate to achieve a reduced population of microorganisms in the system. Methods and apparatus of embodiments of the invention relate to a method for treating a subterranean formation, comprising forming a fluid comprising sodium hypochlorite, a buffer, and a polymer; introducing the fluid to a surface of a subterranean formation; and decreasing a population of microorganisms, wherein the surface of the subterranean formation contains at least 15 percent less microorganisms than if no sodium hypochlorite were in the fluid, and wherein the fluid exhibits a pH of about 4.0 to about 7.5. Methods and apparatus of embodiments of the invention relate to a method for treating a subterranean formation, comprising forming a fluid comprising sodium hypochlorite and sodium diacetate; and introducing the fluid to a subterranean formation, wherein forming the fluid does not include introducing an acid, and wherein forming the fluid does not include forming a precipitate.

1 . A system for treating a subterranean formation, comprising:
 mixing equipment to form a fluid comprising sodium hypochlorite and sodium diacetate; and   pumps and a tubular to introduce the fluid into the subterranean formation,   wherein a surface of the subterranean formation contains less microorganisms than if no sodium hypochlorite were in the fluid.   
     
     
         2 . The system of  claim 1 , wherein the fluid is introduced to the subterranean formation by drilling equipment, fracturing equipment, coiled tubing equipment, cementing equipment, or onshore or offshore water injectors. 
     
     
         3 . The system of  claim 1 , further comprising equipment to control the pH to about 4.0 to about 7.5. 
     
     
         4 . The system of  claim 1 , wherein the fluid further comprises a viscosity modifying agent. 
     
     
         5 . The method of  claim 1 , wherein the fluid further comprises an enzyme activity minimizer. 
     
     
         6 . A method of producing a petroleum product from a wellbore, comprising:
 using a well treatment system comprising mixing equipment, pumps, and a tubular;   forming a fluid comprising sodium hypochlorite and sodium diacetate; and   introducing the fluid to the well treatment system to achieve a reduced population of microorganisms in the system.   
     
     
         7 . The method of  claim 6 , wherein the fluid has a concentration of 1 to 8,500 ppm hypochlorous acid. 
     
     
         8 . The method of  claim 6 , wherein the well treatment system further comprises drilling equipment, fracturing equipment, coiled tubing equipment, cementing equipment, or onshore or offshore water injectors. 
     
     
         9 . The method of  claim 6 , wherein the introducing the fluid to the system further comprises fracturing, drilling, controlling sand, cementing, or injecting a wellbore. 
     
     
         10 . The method of  claim 6 , further comprising adjusting the pH to about 4.0 to about 7.5. 
     
     
         11 . The method of  claim 6 , wherein the fluid further comprises a viscosity modifying agent. 
     
     
         12 . A method for treating a subterranean formation, comprising:
 forming a fluid comprising sodium hypochlorite, a buffer, and a polymer;   introducing the fluid to a surface of a subterranean formation; and   decreasing a population of microorganisms,   wherein the surface of the subterranean formation contains less microorganisms than if no sodium hypochlorite were in the fluid, and   wherein the fluid exhibits a pH of about 4.0 to about 7.5.   
     
     
         13 . The method of  claim 12 , wherein the fluid is introduced to the subterranean formation by drilling equipment, fracturing equipment, coiled tubing equipment, cementing equipment, or onshore or offshore water injectors. 
     
     
         14 . The method of  claim 12 , further comprising controlling the pH to about 4.0 to about 7.5. 
     
     
         15 . The system of  claim 12 , wherein the fluid further comprises an enzyme activity minimizer. 
     
     
         16 . A method for treating a subterranean formation, comprising:
 forming a fluid comprising sodium hypochlorite and sodium diacetate; and   introducing the fluid to a subterranean formation,   wherein forming the fluid does not include introducing an acid, and   wherein forming the fluid does not include forming a precipitate.   
     
     
         17 . A system, comprising:
 a subterranean formation,   a well treatment apparatus comprising mixing equipment, pumps, and a tubular, and   a fluid comprising sodium hypochlorite and sodium diacetate to achieve a reduced population of microorganisms in the system.