Patent ID: 8789596

Claim:
A method of fracturing a multi-zone subterranean formation penetrated by a well which comprises: (a) injecting into a first zone of the subterranean formation in a single-step a buffered HF sandstone acidizing solution, wherein the buffered HF sandstone acidizing solution is injected at a pressure sufficient to create or enlarge at least one fracture in the first zone; (b) injecting a pad fluid, a fracturing fluid or both a pad fluid and a fracturing fluid and displacing the buffered HF sandstone acidizing solution farther into the created or enlarged fracture wherein: (i) a pre-flush is not injected into the first zone before step (a); and (ii) a post-flush is not injected into the first zone after step (a); (c) sealing the first zone from other zones in the formation; (d) repeating steps (a), (b) and (c) in at least one other zone of the multi-zone subterranean formation.