Gas-Liquid Hydrodynamics during Liquid Displacement by Gas in Up-Hill Pipeline

Author:

Liu Huishu1,Chen Jianhui2,Tao Jiali1,Li Na3,Duan Jimiao1,Chen Yan1

Affiliation:

1. Department of Petroleum, Army Logistics Academy, Chongqing 401331, China

2. China National Aviation Fuel Corporation Ltd., Wenzhou Branch, Wenzhou 325024, China

3. China Petroleum Technology and Development Corporation, Beijing 100029, China

Abstract

Mobile pipelines are the most efficient and reliable way to transport large quantities of oil over long distances in warfare, rescue and disaster relief. The oil in the pipe must be discharged and recovered when the oil transfer task is completed, usually via gas cap evacuation. Gas cap evacuation is the main method to evacuate mobile pipelines. During evacuation, due to the influence of topography, working conditions and gravitational forces, the oil in an up-hill pipeline is gradually deposited in the low-lying part of the pipeline to form a liquid, resulting in the incomplete emptying of the pipeline which directly affects the recovery efficiency of the pipeline. Focusing on the analysis of the gas carrying oil flow process in an up-hill pipeline during the evacuation of gas displacing oil in the mobile pipeline, the tail and head of the liquid accumulation were analyzed, and the liquid accumulation flow model was established based on the gas–liquid two-phase stratified flow theory. This model was used to analyze the flow law of the accumulated liquid under different pipe inclination angles, initial accumulation thicknesses and pipe diameters. It was found that the stagnant oil in the pipeline is carried by the gas flow into the upward tilting pipeline due to the influence of the axial gravity force of the pipeline. The gas flow can be divided into three phases: the initial discharge stage, the oscillation stage and the final discharge (reflux) stage.

Funder

National Natural Science Foundation of China

Major Project of Science and Technology Research Program of Chongqing Education Commission of China

Young Elite Scientists Sponsorship Program

Publisher

MDPI AG

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