Solution mining water soluble salts at high temperatures

E - Fixed Constructions – 21 – B

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166/30

E21B 43/30 (2006.01) E21B 43/28 (2006.01)

Patent

CA 1113377

Abstract of the Disclosure Subterranean formations of water soluble salt deposits are solution mined by introducing into the formation an aqueous solvent having a temperature substantially above the temperature of the deposit thereby heating the deposit and dissolving the soluble salts, and withdrawing from the deposit an aqueous solution enriched in the dissolved salts. An aqueous solvent having a temperature lower than the temperature of the first solvent is subsequently introduced into the deposit thereby recaptur- ing heat given up to the deposit and dissolving the soluble salt utilizing greater solubility characteristics of the soluble salts owing to the increased deposit temperature, and withdrawing from the deposit a substantially increased amount of dissolved salt.

341744

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