A process has been developed to flow geothermal vent gas, containing hydrogen sulfide, through a bed of halogen containing oxidizing agent granules. In the absence of significant moisture, hydrogen sulfide reacts with the oxidizing agent to yield elemental sulfur and hydrogen halide gas. The elemental sulfur deposits on the oxidizing agent particles, and the produced hydrogen halide gas is sparged into brine, steam condensateor water. The acid gas dissolves in aqueous solution to yield an inorganic acid solution. The acid may be used to decrease brine pH for silica, carbonate or metal sulfide scale control. The brine pH modification process is especially effective in inhibiting silica/silicate scale deposition from flashed, re-injection brine. The acid solution may also be used in well stimulations to dissolved carbonates and metal sulfides that havedeposited in tubulars or the reservoir formation. Stimulations can restore productivity or injectivity of wells.

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