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Characteristics of oil-water two‑phase flow pattern evolution and pressure drop change during restart of shutdown pipeline
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Xiaoyun YIN1, 2, Jing LI1, 2, Jun SHEN1, 2, Lihua LIU3, Zihan ZHAO4, Zhen ZHU4, Jiaqiang JING5, 6, Rinat M KARIMOV7
Fluid Machinery | 2025, 53(3) : 17 - 25
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Fluid Machinery | 2025, 53(3): 17-25
Characteristics of oil-water two‑phase flow pattern evolution and pressure drop change during restart of shutdown pipeline
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Xiaoyun YIN1, 2, Jing LI1, 2, Jun SHEN1, 2, Lihua LIU3, Zihan ZHAO4, Zhen ZHU4, Jiaqiang JING5, 6, Rinat M KARIMOV7
Affiliations
  • 1Safety，Environment and Technology Supervision Research Institute of PetroChina Southwest Oil and Gas Field Company，Chengdu 610041，China
  • 2Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province，Chengdu 610041，China
  • 3PetroChina Southwest Oil and Gas Field Digital Intelligent Technology Branch，Chengdu 610051，China
  • 4PetroChina Southwest Oil and Gas field Company，Chengdu 610051，China
  • 5School of Oil & Natural Gas Engineering，Southwest Petroleum University，Chengdu 610500，China
  • 6Oil & Gas Fire Protection Key Laboratory of Sichuan Province，Chengdu 611731，China
  • 7Department of Transport and Storage of Oil and Gas，Ufa State Petroleum Technological University，Ufa 450062，Russia
Published: 2025-03-30 doi: 10.3969/j.issn.1005-0329.2025.03.003
Outline
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To address restart challenges in heavy oil‑water ring pipelines caused by water ring instability，an experimental study was conducted using a laboratory‑scale restart loop system with four conventional heavy oils. The research investigated flow pattern evolution and pressure drop characteristics during pipeline restart under constant water velocity，analyzing effects of oil holdup （Ho），oil viscosity （μo），shutdown duration （tst），and water velocity （Ucl）. An exponential decay model was established to describe time‑dependent restart pressure drop. Results reveal four distinct flow pattern phases during constant‑flow restart： water shear stripping of oil layer，oil droplet/cluster migration，wall‑adherent film formation and film detachment. The pressure drop exhibits initial peak followed by decay and equilibrium stages，with model predictions showing excellent agreement （goodness‑of‑fit values approaching 1）.Within tested ranges （Ho=0.26~0.76，μo=1.055 3~3.02 Pa·s，tst=0.5~1.0 h，Ucl=0.25~1.01 m/s），maximum restart pressure drop increases with Ho，μo，tst，and Ucl （up to 30.38 kPa），while restart duration extends with Ho，μo，and tst but shortens with Ucl （up to 3 616.78 s）.This study provides theoretical and practical guidance for optimizing pipeline restart operations.

heavy oil  /  water ring  /  restart characteristics  /  restart pressure drop  /  predictive model
尹晓云, 李静, 申俊, 刘力华, 赵梓涵, 朱祯, 敬加强, Rinat M KARIMOV. 停输管道再启动过程油水两相流型演变与压降变化特性. 流体机械, 2025 , 53 (3) : 17 -25 . DOI: 10.3969/j.issn.1005-0329.2025.03.003
Xiaoyun YIN, Jing LI, Jun SHEN, Lihua LIU, Zihan ZHAO, Zhen ZHU, Jiaqiang JING, Rinat M KARIMOV. Characteristics of oil-water two‑phase flow pattern evolution and pressure drop change during restart of shutdown pipeline[J]. Fluid Machinery, 2025 , 53 (3) : 17 -25 . DOI: 10.3969/j.issn.1005-0329.2025.03.003
Appendix
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Year 2025 volume 53 Issue 3
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Article Info
doi: 10.3969/j.issn.1005-0329.2025.03.003
  • Receive Date：2024-05-08
  • Online Date：2026-10-20
  • Published：2025-03-30
Article Data
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History
  • Received：2024-05-08
  • Revised：2024-12-10
Affiliations
    1Safety，Environment and Technology Supervision Research Institute of PetroChina Southwest Oil and Gas Field Company，Chengdu 610041，China
    2Shale Gas Evaluation and Exploitation Key Laboratory of Sichuan Province，Chengdu 610041，China
    3PetroChina Southwest Oil and Gas Field Digital Intelligent Technology Branch，Chengdu 610051，China
    4PetroChina Southwest Oil and Gas field Company，Chengdu 610051，China
    5School of Oil & Natural Gas Engineering，Southwest Petroleum University，Chengdu 610500，China
    6Oil & Gas Fire Protection Key Laboratory of Sichuan Province，Chengdu 611731，China
    7Department of Transport and Storage of Oil and Gas，Ufa State Petroleum Technological University，Ufa 450062，Russia
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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