ENCAPSULATION OF AN ACID PRECURSOR FOR OIL FIELD APPLICATIONS

摘要

The present application provides for an acid precursor capsule that includes an acid precursor that is a non-aqueous ester and a polymerized shell that encapsulates the acid precursor. In some embodiments, the non-aqueous ester acid precursor converts into an associated acid during a hydrolysis period while in contact with water at an elevated temperature. In further embodiments, the associated acid is soluble in water and forms an aqueous acid solution with water. In certain embodiments, the polymerized shell contains the non-aqueous ester acid precursor and prevents interaction between the non-aqueous ester acid precursor and water at the elevated temperature until the polymerized shell dissolves in the water during a dissolution period. An acid precursor capsule suspension can include the acid precursor capsule and a suspension fluid. In some embodiments, a method of treatment using acid precursor capsules is provided that includes the step of introducing an acid precursor capsule suspension into a well bore such that the acid precursor capsules contact water at an elevated temperature.