Patent ID: 7093663

Claim:
A method of producing petroleum, gas, or other products from a subterranean formation using seawater, said method comprising the steps of: (a) converting an alkalinity of said seawater to a sulfate by adding an acid gas in an amount sufficient to react with said alkalinity of said seawater and adding an amount of ozone effective to operate as a bactericidal agent and to accelerate the reaction of said acid gas with said alkalinity to form said sulfate; (b) removing said sulfate from said seawater by (i) adding an amine solvent to said seawater effective to form a precipitate comprising said sulfate, (ii) removing at least most of said amine solvent from said seawater by stripping, and (iii) after step (ii), removing said precipitate from said seawater to produce a treated seawater product having at least most of said sulfate removed therefrom; and (c) injecting said treated seawater product into said subterranean formation.