Method for dissolving clay

Details Method for dissolving clay Method for dissolving clay

C - Chemistry, Metallurgy

09

K

31/13

C09K 8/72 (2006.01)

Patent

CA 1069688

ABSTRACT OF THE DISCLOSURE A method for dissolving clay is disclosed which comprises contacting the clay, in alternation, with separate slugs of a hydrogen ion-containing chemical and a fluoride ion-containing chemical. The hydrogen ions and fluoride ions react on the surface of the clay to produce hydrofluoric acid to dissolve the clay. The method is particularly valuable in dissolving the clay in a mixture of sand and clay without dissolving the sand. This finds immediate value in the practice of acid treating subterranean sandstone formations to increase permeability or to restore permeability damaged by clay.

273240

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