THE PREDICTION OF THE MOVEMENT OF ACID AND PERMEABILITY FRONTS IN SANDSTONE

Abstract-A new model has been developed which describes the acidization of sandstone cores. The results how that he reaction of hydrofloric acid with the dissolvable minerals occurs in a narrow zone which moves as a reaction front through the sandstone core. The width of the reaction front is related to the Damkohler Number and the velocity of the reaction front is related to the acid capacity number. The model has virtually no adjustable parameters and agrees extremely well with the experimental results. 1