METHOD FOR ACIDIZING A SUBTERRANEAN FORMATION

摘要

A composition is provided useful in the stimulation of a siliceous clay containing formation to increase production of fluids therefrom wherein the formation contains HCl sensitive minerals and the temperature of the formation ranges from about 80 to about 350 degrees F. The composition has at least an in situ HF-generating source, a boron source capable of reacting with silicates in the formation to form borosilicates therein, and a chelating agent for an ionic aluminum or aluminum containing species in an effective amount to minimize the precipitation of aluminum fluoride and silica gel.