Formulations of sparingly water-soluble active ingredients, consisting of carrier particles provided with active ingredient-containing coatings, the sparingly soluble active ingredients being embedded in coatings composed of amphiphilic copolymers. A system for operating a formation isolation valve includes the valve interconnected in a casing string. However, a high-frequency noise has a frequency higher than that of a carrier wave SH and the amplitude of a noise NzB becomes smaller.