Trapped water displacement from low sections of oil pipelines

Xu, Guangli; Zhang, Guozhong; Liu, Gang; Ullmann, Amos; Brauner, Neima

doi:10.1016/j.ijmultiphaseflow.2010.09.003

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…The associate editor coordinating the review of this article and approving it for publication was Fatih Emre Boran. of water carrying capacity of oil flow based on the formation of water plug in the lowest and horizontal section [5], and verified the model by predicting the critical conditions of the capacity of oil carrying water [6]. Xu et al [7] carried out an experimental study on the distribution of water accumulation, average water content and water phase velocity of oil-water two-phase flow system in uphill transparent resin glass tubes with inner diameter of 50 mm.…”

Section: Introductionmentioning

confidence: 94%

Numerical Study on Diesel Oil Carrying Water Behaviors in Inclined Pipeline Based on Large Eddy Simulation

et al. 2019

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Water accumulation in low-lying areas of product oil pipelines always leads to corrosion damage of pipelines. Predicting the law of product oil carrying water can provide reference for the optimization of pipeline operation parameters and corrosion protection. A Volume of Fluid (VOF) model of oil-water two-phase flow based on Large Eddy Simulation (LES) was established to investigate the diesel oil carrying water behaviors in inclined uphill pipes. Through comparative study of experimental and simulation results based on Reynolds-Averaged Navier-Stokes (RANS) method, it is proved that the two-phase flow model based on LES-VOF can capture flow pattern characteristics such as wavy stratified flow, stratified flow and dispersed flow under different flow conditions. The model was used to simulate the oil carrying water process at different inlet oil flow velocities and inclination angles of uphill pipe on experimental scale. It was found that the shear rate of the oil-water interface increases with the increase of the inlet oil velocity, which leads to the increase of oil carrying water capacity. With the increase of slope angle, the two-phase flow pattern gradually transits from wavy stratified flow to dispersed flow. The model established in this paper provides a new method for the study of oil carrying water in product oil pipeline.INDEX TERMS Inclined uphill pipe, diesel oil, oil-water two-phase flow, LES, VOF.

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Section: Introductionmentioning

confidence: 94%

Numerical Study on Diesel Oil Carrying Water Behaviors in Inclined Pipeline Based on Large Eddy Simulation

et al. 2019

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“…The existing impurities damage pumps, sealing devices and filter devices [2,3], and also cause the scour corrosion of the pipe walls [4]. The impurities also adsorb the free water in the oil, causing the electrochemical corrosion of the pipeline [5]. The corrosion affects the oil transportation and oil quality, and even causes safety issues.…”

Section: Introductionmentioning

confidence: 99%

Simplified Layer Model for Solid Particle Clusters in Product Oil Pipelines

Chen

Miao

et al. 2021

Advances in Heat Transfer and Thermal Engineering

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Pipe corrosion caused by the pressure tests using water before starting the normal operation occurs often in Chinese product oil pipelines because of remaining water. To explore the migration of the corrosion impurities in the product oil pipelines, this study started from the force balance principle and considered the entire particle cluster as the research object. This paper established a one-dimensional migration model, and proposed the Froude number equality criterion to calculate the particle cluster length in the equilibrium state. The proposed criterion was verified by experiments. A loop was built to conduct the tests and obtain the migration velocities of the particle cluster from the non-equilibrium state to the equilibrium state in the pipeline. The proposed model was verified using the experimental data. Verification results demonstrate that the model can describe the development process from the non-equilibrium state to the equilibrium state of particle clusters after sudden external disturbance and accurately predict some important parameters, including the velocity of the particle cluster in the equilibrium state and the critical velocity that leads to the transition from fixed bed flow to moving bed flow. The model provides the theoretical basis and calculation method to remove corrosion impurities from product oil pipelines.

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“…However, frequent pigging operations will increase the cost and risk of the pipeline operation. Through the experiment, Xu et al [ Xu, Zhang, Liu et al (2011)] proposed a method to remove the trapped water out from the multiproduct pipelines by adjusting the oil flow rate at the entrance of the pipelines. This pipeline pigging method without pigging equipment can be called Hydraulic Pigging Method (HPM).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Trapped Solid Particles Displacement From the Elbow of an Inclined Oil Pipeline

Ding¹,

Liang²,

Li³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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The solid particle impurities generated by pipe wall corrosion might deposit at the elbow of hilly pipelines during the production shutdown of oil pipelines. These solid particle impurities will seriously affect the safety of the pipeline operation and the quality of the petroleum products. Thus, it is necessary to study the methods of removing these trapped particles from pipelines. At present, the most common way to remove these solid particle impurities is pigging oil pipelines periodically by utilizing the mechanical pigging method, while the frequent pigging operation will increase the cost and risk of pipeline operation. It is very convenient and economical to remove the accumulated particles out from the pipeline by oil stream, which can be named Hydraulic Pigging Method (HPM). However, the behavior mechanism of particle in flowing oil is still unclear. This motivates the present research on the particles flushed out by the flowing oil. A numerical model governing the trapped particles displacement from the elbow of an inclined oil pipeline is established in the Euler-Lagrangian framework. The simulation is achieved via CFD coupling with DEM. The CFD method is employed to solving the continuous phase flow, while the discrete particle phase is tracked by the DEM. The numerical model is first validated by comparison with results taken from the published literature. From the simulation results, it is observed that the oil stream, carrier phase, can only flush out the solid particles in a certain diameter range under the given operation conditions, and the particles whose diameter beyond that diameter range will cannot be removed out from the pipeline. The influence of the pipe inclined angle, the oil bulk velocity and the particle diameter on the particle migration characteristics is examined in detail. Furthermore, in order to enhance the efficiency of HPM, an Enhanced Hydraulic Pigging Method based on Multi-Physical Field Collaboration (EHPM-MPFC) is also proposed in the present work. The EHPM-MPFC is validated for having high pigging efficiency via the comparison of the migration characteristics of particles during the EHPM-MPFC and HPM process. The present results can provide the guidance to the HPM operation of products pipelines.

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Trapped water displacement from low sections of oil pipelines

Cited by 13 publications

References 8 publications

Numerical Study on Diesel Oil Carrying Water Behaviors in Inclined Pipeline Based on Large Eddy Simulation

Numerical Study on Diesel Oil Carrying Water Behaviors in Inclined Pipeline Based on Large Eddy Simulation

Simplified Layer Model for Solid Particle Clusters in Product Oil Pipelines

Numerical Study of Trapped Solid Particles Displacement From the Elbow of an Inclined Oil Pipeline

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