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Increasing separation efficiency is a critical issue requiring the appropriate number of stages and separation pressure at wellbore collection and processing facilities. Optimizing unit parameters is a pressing issue, as it allows for a significant increase in oil yield by several percent, which, in today’s environment, significantly increases company profits and optimizes the cost of producing one ton of oil. This research focuses on the collection and processing of wellbore products. Primary oil processing occurs in preliminary water separation and treatment units. In this unit, the oil-water emulsion passes through separators, where associated petroleum gas is released by reducing pressure. Associated petroleum gas can be used for various purposes: injection into the reservoir to maintain reservoir pressure; generation of heat and electricity for internal needs; and shipment to gas processing plants. Secondary oil processing occurs in integrated oil treatment units, where the oil-water emulsion is separated from water, salts, and impurities. Water separation occurs in special devices called settling tanks, where water and oil are separated by density differences. This paper addresses the problem of selecting the optimal pressure for an oil and gas field using the Katz method. The field under study is characterized by low-viscosity gas-saturated oil, requiring multiple separation stages to most effectively remove associated petroleum gas. The calculations were performed in Excel using tables and the ”Solver“ function to find the parameters of the liquid and gas phases. Graphs were constructed for oil yield versus pressure in a two-stage separation system and for oil yield versus pressure in a three-stage separation system. Based on the results obtained, it can be concluded that a three-stage separation system, rather than a two- or six-stage system, would be more appropriate for this field.