Patent ID: 7482311

Claim:
An oilfield treatment method in which a filter cake is formed and at least partially destroyed on a subterranean formation surface, the method comprising: a. preparing an oilfield treatment fluid comprising: i. a solid acid-precursor, the solid acid-precursor coated with a hydrolysis-delaying material, and ii. a solid acid-reactive material; b. injecting said oilfield treatment fluid into a wellbore penetrating said formation, causing said fluid to contact said formation surface; c. forming a filter cake on said formation surface; and d. allowing at least a portion of said solid acid-precursor to hydrolyze, provided that the mixture of the solid acid-precursor and the solid acid-reactive material is not a combined mixture, wherein the solid acid-reactive material is incorporated in an amount such that when the mixture contacts water, hydrolysis of the solid acid-precursor is accelerated, and wherein the solid acid-reactive material neutralizes and is dissolved by the acid generated due to the hydrolysis of the solid acid-precursor.