Study on Formation Mechanism of Trailing Oil in Product Oil Pipeline

doi:10.11885/j.issn.1674-5086.2019.01.03.01

Abstract

Abstract: Trailing oil is the tail section of contamination in oil pipelines. It is generated in batch transportation, and it has an effect on the quality of oil. In the dead-leg section, the main reasons for the formation of trailing oil contamination is the outflow of the preceding batch that remains in the dead-legs. The traditional calculation formula of oil mixing does not consider the influence of trailing oil. The Reynolds time-averaged method is used to simulate turbulence. To obtain contamination-related experimental data, Computational Fluid Dynamics (CFD) software is used to simulate different flow rates and bypass lengths. The oil replacement rate in a dead-leg is exponentially related to the flow speed and the length of the dead-leg is exponentially related to the replacement time of the oil. To reduce the amount of contamination, the main flow speed should be kept at about 1.6 m/s, and the length of the dead-leg should be less than five times the diameter of the main pipe. The MATLAB software was used to perform multi-nonlinear regression for the oil substitution time, the length of the dead-leg, and the flow speed to calculate the contamination length. A modified equation for calculating the length of the contamination was obtained by combining the Austin-Palfery equation with new factors. Using engineering data, the contamination predicted by the corrected equation is closer to the actual contamination than that predicted by other equations.

Key words: batch transportation, trailing oil, dead-leg, contamination, modified equation

CLC Number:

TE832

LIU Enbin, LI Wensheng, CAI Hongjun, XIE Ping, SHANG Chen. Study on Formation Mechanism of Trailing Oil in Product Oil Pipeline[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 155-164.

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