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| A Prediction Model for Impact Force of Two-phase Flow in Underwater Pipeline-riser System of Offshore Oilfield |
| Received:October 21, 2019 Revised:December 11, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.04.006 |
| KeyWord:offshore oil filed fluid-solid coupling vibration severe slugging impact force |
| Author | Institution |
| LI Wen-sheng |
CNPC Tubular Goods Research Institute, Xi′an , China;Xi’an Jiaotong University, Xi′an , China |
| FENG Yao-rong |
CNPC Tubular Goods Research Institute, Xi′an , China |
| ZHANG Xi-ning |
Xi’an Jiaotong University, Xi′an , China |
| ZHU Wen-jun |
Oil Pumping Machinery Manufacturing Plant, Bohai Equipment Tianjin New Century Machinery Manufacturing Co., Ltd, Tianjin , China |
| WANG Guang-ming |
Oil Pumping Machinery Manufacturing Plant, Bohai Equipment Tianjin New Century Machinery Manufacturing Co., Ltd, Tianjin , China |
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| Abstract: |
| The paper aims to analyze the fluid-solid coupling characteristics between the impact force caused by two-phase flow and the natural frequency of the pipeline. In this paper, a fluid-solid coupling prediction model for severe slugging in pipeline-riser system was developed to analyze the relationship between the flow characteristics such as slug frequency, vortex street frequency and the natural frequency of the pipe and obtain the impact characteristics at different stages of severe slugging. It was found that the maximum impact force in the horizontal direction was at the junction of the horizontal pipe and the downward inclined pipe (which was about 703.3 N). The maximum impact force in the vertical direction was at the bottom of the riser (which was about -993.5 N). The impact fore on the pipeline was consistent with the pressure fluctuation caused by the two-phase flow. The impact force on the pipe wall increased fiercely at the blow-out stage. Vibration characteristics caused by different stage of severe slugging cannot be ignored. In the actual design and use of sea pipelines, the vibration characteristics of pipelines need to be comprehensively evaluated in combination with the operation conditions. |
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