FEATURES OF THE DEVELOPMENT OF WATER OIL ZONES OF DEPOSITS WITH HIGH VISCOSITY OIL
He process of developing platform-type oil fields is significantly affected by water oil zones (WOZ), which contain significant oil reserves. In most cases, there is a lag and insufficient production of WOZ in comparison with the initial pure oil parts of the reservoir. This lag is associated with many factors: technological (operating conditions, grid density) and geological (layer and zonal heterogeneity, the ratio of oil-saturated and water-saturated capacities, the configuration and dimensions of the upper water storage zone, their occurrence relative to the anhydrous parts of the deposits, etc.). This article discusses the features of the development of oil fields in the north-west of Bashkiria, establishes the relationship between the main development indicators, such as the maximum production rate, oil recovery coefficient, water cut, and density of the well network, both among themselves and from various external factors. Besides, additional difficulties are identified associated with increased viscosity, density and low gas saturation of reservoir oil in water oil zones. For analysis, we will consider 5 of the most characteristic sections of the Arlan area: Ashitskaya I, Saklovskaya IV, Arlanskaya V, Arlanskaya VI and Urtaulskaya VIII, where water oil and fully oil zones of the CVI layer are developed. These areas have significant oil reserves in the oil and water zones, while the selected areas are hydrodynamically quite isolated either by deflections or by the absence of reservoirs or low permeability formations, which determines the independence of the relationships established between the considered technological indicators from any external geological factors.