Numerical Calculation of Effects of H2S Distribution on Crude Oil Flow Velocity in T-pipeline

During the pipeline transportation of crude oil, liquid medium often contains a certain amount of acidic gases, primarily H2S. These gases have very strong causticity which can cause uneven corrosion or pitting corrosion on pipeline wall leading to leakage accidents. By studying the gas-liquid two phases flow in T-pipeline, it was found that two phase media were always uneven at the branch. By numerical calculation of the two phases flow, the steady-state distribution law of H2S in pipeline was obtained. The results show that when crude oil flows in T-shaped pipeline, it generates a constant high concentration of H2S area in the backflow. The change of H2S concentration increases with the increase of the velocity of crude oil; the change of speed has little effect on H2S concentration distribution . It may provides a theoretical basis for pipeline corrosion protection and ensuring the safe and stable operation of pipeline.