As high-energy-consumption units，oil enterprises are requested to meet the dual requirements of efficient production and energy saving & carbon reduction. Thus，they urgently need to carry out energy optimization management and control and scientifically and rationally assign energy saving and consumption reduction tasks to oil production units. At present，the commonly used decomposition and allocation method of energy consumption quota is the method of unit consumption per ton of oil and gas. Following the historical trend of unit consumption per ton of oil and gas in oil production units，this method calculates the energy consumption scale for each oil production unit in combination with the deployment of development and production in the next year and decomposes and allocates the energy consumption quota roportionally.Although this method requires few parameters and is simple to operate，it follows the historical law and can neither reflect the difference in energy saving space of different oil production units nor indicate the impact of different reservoir conditions on energy consumption. In view of this，this paper proposes a simple，effective，and highly precise calculation method for reasonable energy consumption and consumption reduction potential of crude oil production systems with the help of reservoir numerical simulation，the mathematical statistical analysis of an oilfield, and grey correlation analysis. It can fully reflect the differences in energy consumption levels under different reservoir conditions. Further, the paper develops a decomposition and allocation method for energy consumption quota，which can provide reference and a basis for energy consumption management departments to allocate the energy consumption quota to oil production units scientifically and rationally.