51312-01679-Parametric Study of Solids Deposition in a Heavy-Oil Transmission Pipeline

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Product Number: 51312-01679-SG

ISBN: 01679 2012 CP

Author: Nima Tajallipour

Publication Date: 2012

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Solids deposition has long been known as a leading cause of under-deposit pitting corrosion (UDPC) in both sweet and sour pipelines. While predictive models to characterize the movement (or stagnation) of oil borne sediment exist there has been little published work on the rate of solids accumulation in a continuously operated pipeline. In this paper two regions of a transmission oil pipeline (a 19 km x 48” region and a 47 km x 36” region) are analysed and two different families of curves are generated. These include solids particle holdup (transmittance) under various scenarios in which only a limited number of variables are changed. The amount of solids leaving the pipeline regions for different particle diameters as a function of carrier fluid’s density viscosity and average flow rate as well as the length of pipeline regions are obtained. Pitting induction or incubation time at critical locations are also estimated to assess the risk for the localized under-deposit pitting corrosion and predict the onset for the autocatalytic pitting.This is an extension of the previous solids deposition modeling project which was performed by Broadsword for Enbridge as a part of an internal corrosion direct assessment (ICDA). Through this project a better understanding of the solids deposition behaviour and the internal corrosion mechanism for this pipeline is obtained. Key words: Solids Deposition Sediment Bed Heavy Oil Computational Fluid Dynamics