PECULIARITIES OF ASSESSING THE RESERVOIR PROPERTIES OF CLAYISH RESERVOIRS DEPENDING ON THE WATER OF RESERVOIR PRESSURE MAINTENANCE SYSTEM PROPERTIES

Abstract

The clayish reservoirs of Western Siberia contain more than 60% of the reserves and about half of all oil resources of the Russian Federation. Traditionally, oil production from such reservoirs is accompanied by swelling of clay minerals that are part of the reservoir rock. Such minerals increase in volume when interacting with the waters of the reservoir pressure maintenance system. And this, in turn, causes the clogging of the pore channels. Kaolinite, which is part of the reservoir rock, is usually considered low-swellable clay or completely non-swellable. Therefore, when designing a reservoir pressure maintenance system and choosing a source of water for it, the possible swelling of this clay is not taken into account. Using non-destructive testing methods, the filtration-capacitance properties of clay rocks were determined before and after interaction with different types of waters, and mechanisms for reducing swelling, suitable for optimizing the reservoir pressure maintenance system, were identified.