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Numerical Simulation for Preheating New Submarine Hot Oil Pipelines

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  • Yong Wang

    (College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China
    Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China)

  • Nan Wei

    (School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China)

  • Dejun Wan

    (Sinopec Petroleum Engineering Cooperation, Dongying 257088, Shandong, China)

  • Shouxi Wang

    (College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China)

  • Zongming Yuan

    (School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China)

Abstract

For new submarine hot oil pipelines, accurate simulation of preheating is difficult owing to complex transient flow and coupled heat transfer happening. Using quasi-steady equations to simulate preheating is inadequate as the hydraulic transient phenomenon is neglected. Considering this fact, this paper constructs an unsteady flow and heat transfer coupled mathematical model for the preheating process. By combining the double method of characteristics (DMOC) and finite element method (FEM), a numerical methodology is proposed, namely, DMOC-FEM. Its accuracy is validated by field data collected from the Bohai sea, China, showing the mean absolute percentage error (MAPE) of 4.27%. Simulation results demonstrate that the preheating medium mainly warms submarine pipe walls rather than the surrounding subsea mud. Furthermore, during the preheating process, the equivalent overall heat transfer coefficients deduced performs more applicably than the inverse-calculation method in presenting the unsteady propagation of fluid temperature with time and distance. Finally, according to the comparison results of 11 preheating plans, subject to a rated heat power and maximum flow, the preheating parameter at a lower fluid temperature combined with a higher flow rate will produce a better preheating effect.

Suggested Citation

  • Yong Wang & Nan Wei & Dejun Wan & Shouxi Wang & Zongming Yuan, 2019. "Numerical Simulation for Preheating New Submarine Hot Oil Pipelines," Energies, MDPI, vol. 12(18), pages 1-26, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:18:p:3518-:d:266786
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    References listed on IDEAS

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    4. Li Ding & Jiasheng Zhang & Aiguo Lin, 2019. "A Deep-Sea Pipeline Skin Effect Electric Heat Tracing System," Energies, MDPI, vol. 12(13), pages 1-20, June.
    5. Wuyi Wan & Boran Zhang & Xiaoyi Chen, 2018. "Investigation on Water Hammer Control of Centrifugal Pumps in Water Supply Pipeline Systems," Energies, MDPI, vol. 12(1), pages 1-20, December.
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