In the context of the new industrialization, the issues related to the search for the optimal option for the field's development are genuinely relevant. The article is devoted to creating an integrated economic model of oil-field development, allowing under the chosen development strategy, to achieve maximum cash flow at the site for the planned period, significantly improve the quality and validity of management decisions in oil companies. The article examines the theoretical aspects of economic modelling from the perspective of system thinking and emphasises its importance. It is noted that the conceptual basis for understanding economic modelling can be a system of rational, evolutionary and cognitive aspects. The results of creating a scheme of the complex economic model generated report on technical-economic indicators of field development according to the chosen strategy of development (on the example of Kotovskoe field in the Udmurt Republic), representing two sets of figures with graphic applications. In conclusion, a comparison is made between the economic efficiency of the actually implemented program and the calculated model, which allows achieving the maximum cash flow for the field over the planned period, increasing the company's income, and reducing the risk of making a non-optimal management decision on the development of the field. It is concluded that the stages of the developed economic model can be transposed to the calculation of any field.