American Society of Civil Engineers


Study on Liquid-Column Separation in Oil Transport Pipeline


by Changjun Li, (Professor, School of Petroleum Engineering, Southwest Petroleum University; No.8, Xindu Avenue, Chengdu 610500 E-mail: lichangjunemail@sina.com), Xia Wu, (Master, School of Petroleum Engineering, Southwest Petroleum University; No.8, Xindu Avenue, Chengdu 610500 E-mail: gamy-rushy@126.com), Wenlong Jia, (Master, School of Petroleum Engineering, Southwest Petroleum University; No.8, Xindu Avenue, Chengdu 610500 E-mail: jiawenong08@126.com), and Yongquan Yang, (Project Manager, Department of Laws and Regualtion, Tarim Oil Exploratory Development Headquarters; Kuala, Xinjiang 841000 E-mail: yangyongquan@petrochina.com.cn)

pp. 496-507, (doi:  http://dx.doi.org/10.1061/41073(361)54)

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Document type: Conference Proceeding Paper
Part of: ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications
Abstract: In view of the hydraulic transient problem in heated oil pipeline, an unsteady flow simulation model is built in this paper. The characteristic method and Newton-Raphson method are utilized to solve the model. According to the phenomenon that the light oils would release from the liquid and form void fraction when the pressure is over lowing, the model considers the relationship between the gas release and pressure variation. Then the concentrated cavitations model is utilized to deal with the problem. Based on the model, the computer program is developed to simulate the hydraulic transient. Ultimately, this paper analyses the hydraulic transient behavior at the high-point place which is in front of the middle pump station of certain heated oil pipeline when the pump stopped. The study suggests that it is necessary to consider the cavitations and liquid-column separation in order to ensure the simulation results’ accuracy. At the same time, the study shows that analyzing the liquid-column separation phenomenon is also necessary to ensure the oil transport pipeline’s operation safety.


ASCE Subject Headings:
Oil pipelines
Hydraulics