INVESTIGATION OF SELECTIVE PROPERTIES OF THE GEL-FORMING COMPOSITION FOR THE LIMITATION OF WATER INFLOW TO CARBONATE RESERVOIRS CONDITIONS

The article is devoted to the problem of limiting water inflow in a production well. The authors consider the main features of the reservoir, which contribute to premature flooding. This paper presents the basic classification of plugging selective compositions, outlines the advantages and disadvantages of each type. Gel composed of carboxymethylcellulose, chromium acetate and copper sulfate was developed for water production restriction. An alternative way was offered to determine the optimal concentrations of plugging compositions on the change of the total porosity and x-ray density measured in the x-ray tomograph. Dynamics of the effective viscosity on the magnitude of the gap, simulating the fracture was obtained – the viscosity decreases logarithmically. Filtration experiments confirmed the selective properties of the gelforming composition