Iron sulfide scale control agent for geothermal wells
AssigneeEcolab USA Inc.
InventorsDinesh Mantri, Jasbir S. Gill
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Abstract
The disclosure relates to improved methods for inhibiting the formation and deposition of sulfide and silica scale in aqueous systems. In particular, the methods include injecting a composition into an aqueous system or wellbore. The composition includes a sulfide scale inhibitor and a silica scale inhibitor. The sulfide scale inhibitor may be a copolymer of acrylic acid or methacrylic acid and an anionic monomer. The silica scale inhibitor may be a copolymer of acrylic acid or methacrylic acid and an alkoxylated monomer.
Claims20
A method for sulfide and silica scale inhibition or reduction in an aqueous system, comprising:
- injecting a composition into the aqueous system, wherein the aqueous system comprises a temperature of about 185° C. to about 370° C., wherein the composition comprises a sulfide scale inhibitor and a silica scale inhibitor, wherein the sulfide scale inhibitor is added in the aqueous system in an amount ranging from about 1 ppm to about 500 ppm and the silica scale inhibitor is added in the aqueous system in an amount ranging from about 1 ppm to about 100 ppm, and wherein the sulfide scale inhibitor disperses iron.
A method for sulfide and silica scale inhibition or reduction in a wellbore, comprising:
- injecting a composition into the wellbore, wherein the wellbore comprises a temperature of about 185° C. to about 370° C., wherein the composition comprises a sulfide scale inhibitor and a silica scale inhibitor, wherein the sulfide scale inhibitor is added to the wellbore in an amount ranging from about 1 ppm to about 500 ppm and the silica scale inhibitor is added to the wellbore in an amount ranging from about 1 ppm to about 100 ppm, and wherein the sulfide scale inhibitor disperses iron.
Dependencies are inferred from the claim text.