Geological and field specifics of designing lower well completion systems in Northern Caspian fields as a basis for effective application of enhanced oil recovery methods

The article is devoted to a critically important aspect of the development of complex offshore fields in the Northern Caspian Sea – optimization of the design of bottom-end systems for the effective application of enhanced oil recovery methods (ERM). In conditions of expensive and technically complex offshore drilling, regulatory pressure and the need for import substitution, competent design of bottom-up schemes is becoming a key factor in the economic viability of projects, including in the Northern Caspian Sea. The lower completion system is not just a stage of construction, but an element that determines the controllability of the inflow, minimizing complications (flooding, gas occurrence, etc.) and the success of the applied MUN throughout the life cycle of the well. A practical methodology based on the use of the NETool software package, developed for numerical modeling and optimization of bottom-up circuits, is presented. The complex allows you to integrate geological and field data, simulate in detail the multiphase inflow of fluids, taking into account inflow control devices (ICD), and predict productivity. Special attention is paid to the number of filters in the bottom completion schemes of wells drilled at the Nekom reservoir, and the simulation results, which showed that in these geological conditions, the number of filters does not significantly affect the flow rate in the short term. The importance of long-term operational and economic factors, such as the risk of clogging with an insufficient number of filters or high corrosion activity with a large number of filters, was noted. The unresolved issue of the optimal number of filters and the need for further research, including tests under different conditions, is emphasized. The influence of flow control devices on these factors is separately noted, even if they are omitted in the calculations. The proposed methodology using NETool is a valuable tool for increasing technological efficiency, reducing costs and ensuring the sustainability of development in difficult economic conditions.