SPECIFIC FEATURES OF LABORATORY STUDIES OF NON-HYDROPHILIC ROCKS-RESERVOIRS

The relevance of the research is determined by the need to take into account the surface properties (wettability) when conducting laboratory studies on the core represented by non-hydrophilic reservoir rocks. In relation to the increased volume of research on the study of these rocks, there is a great need to develop and search for new solutions aimed at ultimately obtaining the most reliable data. The main aim of the research is to develop a complex of special petrophysical studies on core samples of reservoir rocks with non-hydrophilic properties. Object: core samples from one of the fields of the Timan-Pechersk oil and gas province. The field is characterized by a complex structure of the hollow space of deposits and a large amount of resinous-asphaltene components in oil. Results. The authors have carried out the typification of the main kinds of wettability described in the literature. The paper considers the complex of different methods for preparing core samples for research and describes the method for determining the wettability parameter on core samples by the Amott-Harvey method. The results of determining the wettability parameter on core samples prepared by different methods: non-extracted samples, standard extraction, «mild» extraction, «aging» of the core are shown. The authors built the diagrams of comparison of the wettability parameter on core samples depending on the preparation method and open porosity. The paper introduces the results of special studies of the core to determine the relative phase permeabilities on the core sample prepared by various methods with the construction of a comparison graph. The conclusions about the significant influence of the methods of preparing core samples during laboratory research are presented.