Patent ID: 9657552
Date: 2017-05-23
CPC Classifications: C09K,E21B

Claim:
1. A method for treating a treatment zone of a well, the method comprising the steps of: (A) forming a first treatment fluid comprising: (B) forming a second treatment fluid comprising: (C) introducing the first treatment fluid and the second treatment fluid in any sequential order into the treatment zone of the well, wherein the treatment zone comprises an acid-sensitive formation and the treatment zone is at a temperature of 250° F. (121° C.) or lower prior to introducing the first and second treatment fluids; (D) allowing the chelating agent to chemically react with an acid-sensitive formation or inorganic scale in the treatment zone; and (E) introducing a treatment fluid different from the first and second treatment fluids into the treatment zone within less than an hour of step (C), thereby, without requiring a shut in of more than one hour between step (C) and step (E), increasing permeability of the acid-sensitive formation or removing inorganic scale in the treatment zone.