Non-standard tasks require the development of new approaches to solve them. The appearance on the market of solvents of scale deposits, including barite, required the development of a methodology for assessing their effectiveness. To solve this problem, SamaraNIPIneft LLC and RN-BashNIPIneft LLC were involved. The results of the joint study with the customer AngaraNeft LLC made it possible to develop an integrated approach to laboratory studies with quantitative assessment criteria: compatibility of analyzed compositions with formation water, drilling mud filtrate, oil and acid composition; content of insoluble sediment in barite, filtration cakes of drilling mud, core material, after exposure to scale deposition solvents, acid composition; coefficient of permeability recovery after exposure to drilling mud, scale deposition solvents, acid composition; changes in morphological characteristics and structure of rock by the method of raster electron microscopy before and after exposure to process fluids. The article provides a description of the methods of the studies performed: evaluating the effectiveness of salt deposition solvents; conducting filtration studies, including assessment of the change in the permeability of the reservoir model after dynamic action and static impact of drilling muds, acid composition and salt deposition solvent; determination of penetration depth and content of barite, halite and quartz absent in the original rock using electron microscopy and energy-dispersion mapping.
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