Abstract: Internal breakers are given that break fluids viscosified with non-polymeric viscosifiers such as viscoelastic surfactants, inside formation pores. The breakers are polyols, for example natural and synthetic sugars, monoalcohols, and mixtures of the two. The sugars may be ketones and aldehydes. The sugars are also breaker aides for oxidizing agents used as breakers. Methods of using the breakers and breaker aides in oilfield treatment fluids are given.

Abstract: The invention discloses a method of delivering a first chemical component to a subterranean formation in a wellbore comprising: providing a fluid comprising a carrier fluid and at least two different sizes of solid particulate materials selected from a group consisting of: very large particles, large particles, medium particles, fine particles, very fine particles and ultrafine particles; wherein the packed volume fraction (PVF) of the two sizes of solid particulate materials exceeds 0.80, and wherein first type of solid particulate materials contains the first chemical component able to be released by a first downhole trigger and second type of solid particulate materials contains the first chemical component or a second chemical component able to be released by a second downhole trigger; pumping the fluid into the wellbore; allowing the first chemical component to be released by the first downhole trigger.