To the problem of control of a well bottom zone colmatation
The paper is devoted to the problems of preserving the reservoir characteristics of a productive formation by controlling the permeability of rocks in the well bottom zone. The paper presents the results of laboratory studies that were carried out to analyze the distribution of pores and their share in filtration processes in a carbonate and terrigenous complex of different permeability. The granular metric composition of the BARACARB carbonate bridging agent with a fineness of 5, 50 microns and their mixtures, as well as the effectiveness of its selection when using the Kauffer packing theory, have been determined. The core material filtration losses when using carbonate bridging colmatant depending on its fineness and comparing the results with the calculated data using the Kauffer theory were estimated, which made it possible to draw some preliminary conclusions about its insufficient accuracy in determining the bridging agent composition.