Methods for delaying in situ acid generation for acid delivery to a site

A method for delivering an acid to a site within a rock formation, the method comprising:

• introducing one or more aqueous fluids to the formation thereby contacting the site with the one or more aqueous fluids comprising an ammonium salt, an oxidizing agent, and a surfactant;
• and
• generating an acid at the site at a rate that is less than the rate of acid generation when the surfactant is absent;
• wherein the surfactant is selected from the group consisting of a phosphonate-based surfactant, a sulfonate-based surfactant, and combinations thereof, and
• wherein the sulfonate-based surfactant is or is derived from one or more selected from methanesulfonate, trifluoromethanesulfonate, pentafluoroethanesulfonate, heptafluoropropanesulfonate, perfluorobutanesulfonate, octanesulfonate, dodecanesulfonate, dodecylbenzene sulfonate, or petroleum sulfonate,
• wherein the surfactant is configured to delay a reaction between the oxidizing agent and the ammonium salt such that acid generation is delayed,
• wherein a molar ratio of the surfactant to the ammonium salt or to the oxidizing agent is 1:1 or less.