In modern conditions oil and gas sector is not only the largest sector of the economy, also this industry plays an important role in social and economic development of the state. In this regard, there is a need for effective regulation of the oil and gas complex, in particular, the state regulation. Market concentration indices CR-3, CR-4, Herfindahl-Hirschman index, Hall-Teidman index and Lind index have been calculated for competitive environment analysis. Having analyzed the competitive environment of the Russian oil market in 2015-2019, it was possible to find out that the Russian oil market in 2015-2016 was moderately concentrated, in 2017-2019 - highly concentrated; during the whole period under consideration the Russian oil market was a monopolistic competition market. The study also analyzed the impact of integration processes on the indicators of socio-economic development of the country. The analysis revealed that gross domestic product (GDP) and consolidated budget revenues are moderately strongly influenced by integration processes on the oil market; the volume of oil production with gas condensate is moderately influenced by them. At the same time, integration processes in the oil market do not have a significant impact on economic growth and foreign trade balance.