Methodology of Creation of Artificial Core Reservoir Formations Using Geometric Design Methods

Abstract

During the operation of oil wells, their flow rates decrease not only due to a reservoir pressure drop but also because the permeability of the bottomhole formation zone (BFZ) decreases because of the fall-out of asphalt-resin-paraffin deposits, colmatization by process fluids, formation of fracture particles, salt deposits, etc. The productivity of such wells can be restored by applying various oil production enhancement (OPEM) methods. Choosing the most effective OPEM, developing the treatment design and predicting well productivity increase is currently done, as a rule, by being based on experimental studies with subsequent application of physical and computer modeling methods. At the same time, to determine experimentally the permeability change coefficient of the reservoir rock by implementing one or other OPEM, using natural cores is a desirable option. They are a source of unique information about the reservoir rock and the character of fluid filtration there-in. Natural cores are extracted from the well at the drilling stage and, as a rule, they are available either in limited quantities or are completely absent. In this case, experimental studies are carried out on artificial cores made by special technologies. At the same time, it is very important and relevant that they have morphological, mineralogical, and filtration-capacity properties (FCP) as close as possible to those of natural cores. Only in this case, we can talk about the adequacy of the physical model and the accuracy of the results of experimental studies, which, in turn, are the initial ones for mathematical modeling. Body text 2 paragraphs.