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research-article

Numerical investigation on multiphase erosion-corrosion problem of steel of apparatus at a well outlet in natural gas production

[+] Author and Article Information
Zhang Jianwen

Lab of Fluid Flow and Heat Transfer and IGCIT, Beijing Key Laboratory of Membrane Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
zhangjw@mail.buct.edu.cn

Jiang Aiguo

Lab of Fluid Flow and Heat Transfer and IGCIT, Beijing University of Chemical Technology, Beijing 100029, China
15601330600@163.com

Xin Yanan

Lab of Fluid Flow and Heat Transfer and IGCIT, Beijing University of Chemical Technology, Beijing 100029, China
917031125@163.com

He Jianyun

Lab of Fluid Flow and Heat Transfer and IGCIT, Beijing University of Chemical Technology, Beijing 100029, China
jianyunhe@mail.buct.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040445 History: Received December 25, 2016; Revised May 26, 2018

Abstract

The erosion-corrosion problem of gas well pipeline under gas-liquid two-phase fluid flow is crucial for the natural gas well production, where multiphase transport phenomena exposes great influences on the feature of erosion-corrosion. An Eulerian-Eulerian two-fluid flow model is applied to deal with the three dimensional gas-liquid two-phase erosion-corrosion problem and the effects of the liquid droplets dissolved with CO2 are taken into consideration. The erosion-corrosion feature at different parts including expansion, contraction, step, screw sections and bends along the well pipeline is numerically studied in detail. An erosion-corrosion model is setup to address the local corrosion and erosion induced by the droplets impinging on the pipe surfaces. Three typical cases are studied and the mechanism of erosion-corrosion for different positions is investigated. It is explored by the numerical simulation that the erosion-corrosion changes with the practical production conditions: Under lower production rate, corrosion is the main cause for erosion-corrosion; under higher production rate, erosion predominates greatly; and under very high production rate, erosion becomes the main cause. It is clarified that the parts including connection site of oil pipe, oil pipe set and valve are the places where erosion-corrosion origins and becomes serious. The failure mechanism is explored and good comparison with field measurement is achieved.

Copyright (c) 2018 by ASME
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