Аннотация: In article the main methods of increase in processes of destruction and washout of a filtrational crust of drilling mud for the purpose of improvement of quality of fastening of wells are investigated and results of laboratory researches on assessment of the washing ability of the multicomponent buffer liquid including solutions of inorganic salts with СМС, NTF additive and the granulated foamglass are presented. On the basis of the made experiments dependences of the washing ability (intensity of filtration) of buffer liquids on concentration of the granulated foamglass are investigated and optimum concentration of abrasive material are established.