Method of aquifer restoration

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C02F 1/28 (2006.01) C02F 1/58 (2006.01) C02F 1/66 (2006.01) C02F 5/02 (2006.01) E21B 43/40 (2006.01)

Patent

CA 1144856

48,040 ABSTRACT OF THE DISCLOSURE A method is disclosed for restoring a clay rich aquifer which has been solution mined with ammonium ions. Calcium carbonate is precipitated from a solution pumped through the aquifer by the addition of calcium oxide, cal- cium hydroxide, or a mixture thereof in quantities suffi- cient to raise the pH to at least about 9.5. The precipi- tated calcium carbonate is separated from the solution and the ammonium ion is then removed from the solution by standard techniques. The solution is recycled through the aquifer and these steps are repeated until the bicarbonate ion concentration has been reduced to such an extent that the addition of at least one soluble salt of calcium, magnesium, or potassium to the solution does not result in precipitation of calcite underground, plugging the aqui- fer. Recycling with the addition of the soluble salt is continued until the ammonium ion concentration is reduced to a desired level. Finally, residual amounts of the salt are removed from the aquifer using standard techniques.

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