Method for removing iron sulfide scale from metal surfaces
AssigneeHalliburton Company
InventorMichael B. Lawson
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Abstract
A process for reducing hydrogen sulfide gas evolution during dissolution of ferrous sulfide with an aqueous acidic solution comprising contacting the ferrous sulfide with an aqueous acidic solution containing an effective amount of an additive comprising at least one member selected from the group consisting of maleic acid, maleic anhydride and the alkali metal and ammonium salts of maleic acid. The aqueous acidic solution also can contain corrosion inhibitors.
Claims16
A process for reducing hydrogen sulfide gas evolution during dissolution of ferrous sulfide with an aqueous acidic solution comprising contacting said ferrous sulfide with an aqueous acidic solution capable of dissolving said ferrous sulfide containing an additive in an amount sufficient to reduce the evolution of said hydrogen sulfide gas during dissolution of said ferrous sulfide, said additive comprising at least one member selected from the group consisting of maleic acid, maleic anhydride, and the alkali metal and ammonium salts of maleic acid.
Dependencies are inferred from the claim text.