FIELD: mining industry. SUBSTANCE: method improves efficiency of dissolving sediments in creations containing productive layers with liquids of variable density. According to method, delivered into bore-hole is liquid composition which is sufficient for dissolving sediments of alkali-earth metal sulfate scale, and due to that contact of sediment occurs in one productive layer of creation. After that, directed into bore-hole is second liquid which dissolves sediment. This liquid has density which is approximately by 0.1 weight % less than density of first liquid. In this case, taking place is contact of additional quantity of perforations and higher located layer. These sediment dissolving liquids with variable values of density are left for contact with perforations and productive layers communicating with them during period of time which is sufficient for dissolving sediments of scale and this is conducive to efficient removing of scale from perforations and productive layers at different levels. Used in function of liquid composition is water solution with pH 8-14 of aminocarboniferous acid or polyamine chelate compound, salts and their mixtures in amount of 0.1-1.0 M and catalyzer in amount of 0.01-0.5 M. Application of aforesaid method ensures distribution of high-density composition which dissolves sediments of sulfate of alkali-earth metal in large perforated productive layer within creation or reservoir. EFFECT: higher efficiency. 10 cl, 1 dwg
