Stability of Water Annulus Transportation of Heavy Oil in Horizontal Pipeline

doi:10.11885/j.issn.1674-5086.2020.12.04.01

Abstract

Abstract: In the present study, simulations for oil-water annular flow through a horizontal pipe were performed by FLUENT software based on VOF two-phase flow model, standard $k-\varepsilon$ turbulence model, and CSF surface tension model. The influences of fluid properties (oil-water density difference, oil-water viscosity ratio, and oil-water interfacial tension) on the distribution of oil-water two-phase and the stability performance of water annulus structure were analyzed. The simulation results indicate that the oil-water properties have no effect on the area-weighted average of the oil volume fraction, which is about 73% in various working conditions. However, they have a significant impact on the volume fraction distribution rules of oil-water two-phase and the stability evaluation indexes of water annulus structure (oil core eccentricity, stable length ratio of annular flow, and pipeline pressure drop). Under the simulated conditions, the oil-water annular flow in a typical eccentric form, where the oil-core located in the upper part of the pipe is wrapped by the upper thin and lower thick water layer. The stability of water annulus is at the best when the oil phase density is 996.4 kg/m$^3$, the oil phase viscosity is 1 743.3 mPa·s, and the oil-water interfacial tension is 22.36 mN/m.

Key words: horizontal pipeline, heavy oil, water annulus, stability, numerical simulation

CLC Number:

TE866

YIN Xiaoyun, SU Ming, ZHOU Xin, ZHANG Liang, JING Jiaqiang. Stability of Water Annulus Transportation of Heavy Oil in Horizontal Pipeline[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(2): 107-116.

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