The study on temperature field variation and phase transition law after shutdown of buried waxy crude oil pipeline. (September 2017)

• Record Type: Journal Article
• Authors: Cheng, Qinglin; Gan, Yifan; Wang, Peidi; Sun, Wei; Xu, Ying; Liu, Yang
• Is Part Of: Case studies in thermal engineering. Volume 10(2017)
• Page Start: 443
• Page End: 454
• Publication Date: 2017-09
• Subjects: Waxy crude oil -- Shutdown -- Numerical simulation -- Temperature field -- Phase transition interface; Heat engineering -- Case studies -- Periodicals; 621.40205
• DOI: 10.1016/j.csite.2017.10.004
• Languages: English
• ISSNs: 2214-157X

Abstract

Abstract: In the buried waxy crude oil pipeline, considering the change of physical properties with temperature and the latent heat of wax precipitation, based on the pipeline-soil-atmosphere coupled heat transfer, the temperature drop model after shutdown is established by apparent heat capacity method. Taking a waxy crude oil transportation pipeline in Daqing Oilfield as an example, under different initial oil temperatures, different environmental temperatures and different soil thermal conductivities, the distribution of temperature field in pipeline and soil is simulated, the influence mechanism on temperature field of these three cases is analyzed. In addition, the phase transition interface of wax precipitation in crude oil is traced, the variation law of interface position after shutdown is analyzed. This research could provide a theoretical basis for the establishment of pipeline shutdown engineering scheme.