The article presents the results of the study of the geological structure of oil and gas deposits in Botuobinsky horizon, affecting the gasification of producing wells and gas breakthrough into the oil rim in the conditions of field development. In the course of the research, a characteristic of the reservoir was given, and the optimal gas-free flow rate was determined by a computational method, which allows us to limit the gas inflow for the operating conditions of the Srednebotuobinskoye oil and gas condensate field. The field under consideration is one of the unique storehouses of the East-Siberian oil cluster located in the Republic of Sakha (Yakutia). The main factors influencing the effective development of oil reserves of gas and oil deposits within the Central block and the Kurung license area are substantiated.

In this work, four wells were analyzed at the Srednebotuobinskoye oil, gas and condensate field located in the Republic of Sakha (Yakutia). Production of oil reserves is complicated by the problem of gas breakthrough from the gas cap into the oil area of the reservoir, which leads to gasification of production wells up to their full shutdown. The field is characterized by the presence of a thin oil rim. That is why there is an urgent need to develop innovative technologies capable of ensuring higher oil recovery rates. The result of the conducted analysis is the object of implementation of the research results of this work.

Reservoir simulation models are utilized by oil and gas companies with a purpose to develop fields. Expansions and improvements in simulation software have lessened the time to develop a model. Simulating the reservoir aims to realize fluid flow, physical, and chemical procedures happening in a hydrocarbon reservoir adequately well for the reason of improving hydrocarbon recovery under various working stipulations. Grid-orientation effects are complicated problem in numerical reservoir simulation. These influences were coming when utilized of numerical utilization mechanism to conditions characterizing physically inconstant displacement procedure. These impacts happen in an assortment simulation of inappropriate and favourable mobility ratio displacements. The current study presents a building static and dynamic model and suggests a development plan for the reservoir under study and change the orientation of the grids to examine the effects of these changes on the values of oil production rate, water cut, pressure, cumulative oil production, and recovery factor. The case studies for an Iraqi oil field which is located in the South East of Iraq. Different values of recovery factors were obtained when the orientation of the grids had been changed.

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