Preventing scale deposition from geothermal fluids

Details Preventing scale deposition from geothermal fluids Preventing scale deposition from geothermal fluids

1978-12-11

1980-09-23

Hart, Charles N.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

166267, 210758, 423224, C02B 502

Patent

active

042241510

ABSTRACT:
A method for preventing the deposition of sulfide and/or sulfate scale during the production of a hot two-phase geothermal fluid which contains hydrogen sulfide, barium heavy and/or transition metals, and at least a critical minimum amount of calcium in solution. Gaseous oxygen is injected into the geothermal fluid at a critical rate to selectively oxidize the hydrogen sulfide to intermediate sulfide oxidation products, such as thiosulfates. Thereafter the geothermal fluid is separated into gaseous and liquid phases. Where iron is present in the geothermal fluid, the degree of turbulence induced during the oxidation step is selectively controlled in order to prevent the deposition of iron pyrites.

REFERENCES:
patent: 3963611 (1976-06-01), Dardenne-Ankringa
patent: 4044830 (1977-08-01), Van Huisen
Wilson et al., "Removal of Hydrogen Sulfide from Simulated Geothermal Brines with O.sub.2 ", U.S. ERDA, 4/1977, pp. 1-79.
Martin et al., "New Column Removes Sulfide with Air", Hydrocarbon Processing, May 1962, pp. 149-152.
Jackson et al., "Possibilities for Controlling Heavy Metal Sulfides in Scale from Geothermal Brines", Livermore Lab., U. of Cal., 1/1976, pp. 1-14.
Wilson, Environmental Aspects of Multi-Purpose Devel. of Geothermal Resources, AICHE Symposium Series, No. 136, 1974, pp. 782-787.

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