基于流固耦合传热模型的井下注天然气流量测量仿真研究OACSTPCD

Oil well gas injection is a common measure to improve oil recovery and prolong oil field production life. Gas (natural gas, carbon dioxide, air, etc.) is injected into oil reservoir through injection wells to maintain or restore oil reservoir pressure, so that the oil reservoir has a strong driving force, and then improve the production speed and recovery efficiency of the oil reservoir. Considering the stability of gas source, cost, transportation, corrosion and miscible pressure, natural gas or associated gas is considered to be the most promising choice. Downhole gas flow measurement is an important technical means to achieve accurate and quantitative stratified gas injection. However, due to the unfixed natural gas components and the complex conditions of underground high temperature and high pressure, the accurate flow measurement and on-site calibration face great challenges. Based on the fluid-solid coupling heat transfer model, this paper conducts simulation research on the natural gas flow measurement of thermal flowmeters under different working conditions, simulates experimental environments under high temperature and pressure. Then the input - output relationship between gas mass flow and temperature difference is established to provide effective guidance for follow-up field experiments and measurements.