Some specific features of development of oil deposits confined to hydrophobic collectors under conditions of a water pressure mode
In a hydrophobic reservoir, the capillary pressure arising at the water-oil contact border according to Jung-Laplace’s law is negative. This phenomenon, combined with the properties of liquids, to spontaneously assume the position and shape when their surface (capillary) energy reaches a minimum value, which, in contrast to oil, makes it energetically advantageous for water to occupy the largest pores and cracks in a hydrophobic reservoir, along which, in conditions of the water pressure mode, it very quickly breaks through to production wells, dragging along some volumes of oil. This fact, already in the initial stage of development leads to high water cut of producing wells reaching 90 % or more. The paper presents some recommendations on measures that can reduce the degree of negativity of such a phenomenon.