In article questions of compatibility of properties on regulation of parameters of boring flushing liquids of the composite additive consisting of complex reagent of the ferro-chromelignosulfonate and silicate of sodium are considered. Planning of an experiment by a standard technique is carried out, the regression equation is received. Influence of three factors is investigated: the FHLS chemical reagents, silicate of sodium and heat treatment on optimization parameters application of a full-factorial experiment by Boxing Wilson of the plan of type 2k (k=3, number of factors) has determined the prospects of application of composition when drilling the clay intervals inclined to loss of stability of the well trunk walls. (C) 2018 "OilGasScientificResearchProject" Institute. All rights reserved.