| Abstrakt: |
Due to the high viscosity of heavy oil, its gathering, transportation, storage and transportation projects are difficult. Heavy oil transportation pipelines usually have many bends, and the friction and pressure drop at the bends will increase significantly. However, there is little research on friction and pressure drop generated at L-shaped curve during heavy oil transportation. In this study, an experimental system for measuring the friction and pressure drop at the L-bend during heavy oil transportation was designed. Based on the experimental data, the influence of temperature, pipe diameter and other factors on the friction and pressure drop at the L-bend is analyzed. On this basis, the environmental effect of Lshaped bend after being damaged by impact load is discussed. It is found that, with the continuous increase of the temperature of heavy oil in the gathering and transmission pipeline, the oscillating pressure drop of heavy oil flowing through the L-shaped bend will gradually decrease. At the beginning of the experiment for 3s, a maximum pressure drops of 0.25 MPa occurred at the L-shaped bend during the experiment. After that, the oscillating pressure drop was stabilized at about 0.13 MPa. Moreover, with the increasing temperature of heavy oil in the gathering pipeline, the oscillating pressure drop and displacement will gradually decrease when flowing through the L-shaped elbow. When the temperature of the heavy oil in the pipeline increases from 25 to 100, the pressure drops of the shock when the oil flows through the L-shaped bend will decrease from 2.55 MPa to 0.46 MPa, and the maximum displacement of the pipeline will also decrease from 5.86 cm to 1.33 cm. Finally, after the L-shaped bend is damaged by vibration, the analysis of oil spill pollution shows that the diffusion range of crude oil in the formation will gradually expand with the continuous oil leakage, but the diffusion rate of crude oil in the formation will gradually slow down. This research can provide a good idea for improving the efficiency of heavy oil water ring transportation and reducing the environmental pollution caused by crude oil leakage. [ABSTRACT FROM AUTHOR] |
