Oil reserves of sub-gas zones are in low-activity development due to high risks of water and gas breakthroughs. One of solutions to this problem can be inflow control devices (ICD). There are two main classes of inflow control devices – passive ICD (PICD) and autonomous ICD (AICD). AICD are most appropriate for development of oil rims. The use of AICD is possible on formations characterized by viscosity differentiation between oil and the breakthrough fluid, permeability differentiation as well as presence of non-reservoir intervals.
The main goal of this paper is study of AICD efficiency in horizontal wells, taking into account characteristics of target object. To carry out research, special module was used for flow rate calculations of wells with inflow control devices (developed by RN-BashNIPIneft). The paper presents comparative basic calculations of a well with and without AICD, before and after a breakthrough, with and without production restrictions. The technological criterion for the use of AICD is defined. Dependences of well flow rate on oil and on water for different amounts of AICD are constructed. Amount of AICD for effective choking of an unwanted phase is determined. Accumulated oil production was compared for options with and without AICD. The principles of choosing quantity and type of ICD depending on reservoir properties were formed. These principles were used to justify the completion strategy for a number of Rosneft fields.
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