Acidizing stimulation method using a ph buffered acid solution

Details Acidizing stimulation method using a ph buffered acid solution Acidizing stimulation method using a ph buffered acid solution

E - Fixed Constructions

21

B

E21B 43/27 (2006.01) C09K 8/528 (2006.01) C09K 8/72 (2006.01) E21B 37/00 (2006.01) E21B 43/25 (2006.01)

Patent

CA 2474321

A method of stimulating subterranean formations in oil and gas wells using a high pH buffered acid system. The method may be used to treat sandstone formations wherein the pH buffered acid system is used as the preflush or overflush or both. The method consists of introducing into the well a hydrofluoric acid containing sandstone acidizing solution either prior to or subsequent to introduction of the pH buffered acid system. The pH buffered acid system may further be used in the treatment of carbonate reservoirs. The pH of the buffered acid solution is substantially equivalent to that of the pH of the acidizing solution. The buffered acid solution is void of either hydrofluoric acid or hydrofluoric acid precursors.

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