One of the main tasks of oil and gas production companies is increasing the efficiency of wells operation while gas-cap oil reservoirs development. In particular, a successful solution of this task can contribute to a significant increasing of production rates of wells located in under-gas-cap (UGC) zones or near the gas- oil contact (GOC) zones with a small thickness of the gas cap, which is in direct interaction with an oil- saturated part of a reservoir. In such conditions, the task of estimating the thickness of the gas cap, which directly affects the value of the gas-oil ratio (GOR) and the regulation of the well operation mode acquires special importance. In particular, this ensures the growth of well productivity with a low GOR, which allows a substantial increase in oil production and net present value (NPV). In this paper the new approach to interpretation of hydrodynamic study of horizontal wells by numerical methods in the Saphir software and an analytical method for GOR evaluation are proposed. The proposed solutions allow: 1. To correctly interpret the hydrodynamic studies of horizontal wells located in UGC or near the GOC; 2. To determine the thickness of the gas cap above the horizontal well, to evaluate "expansion" of the gas cap and to correct the map of the GOC distribution; 3. To regulate an operating mode of production wells.
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