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http://dx.doi.org/10.7842/kigas.2020.24.6.18

A Study on the Flow Assurance in Subsea Pipeline Considering System Availability of Topside in LNG-FPSO  

Kim, Young-Min (Petroleum&Marine Research Division, Korea Institute of Geoscience and Mineral Resources)
Choi, Jun-Ho (Institute of Technology, Gwang-Sung GM)
Lee, Jeong-Hwan (Dept. of Energy and Resources Engineering, Chonnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.24, no.6, 2020 , pp. 18-27 More about this Journal
Abstract
This study presents flow assurance analysis in subsea pipeline considering system availability of topside in LNG-FPSO. A hydrate management strategy was established, which consisted of PVCap experiments, system availability analysis of LNG-FPSO topside, hydrate risk analysis in the pipeline, and calculation of PVCap injection concentration. The experimental data required for the determination of PVCap injection concentration were obtained by measuring the hydrate induction time of PVCap at the subcooling temperatures of 6.1, 9.2, and 12.1℃. The availability of LNG-FPSO topside system for 20 years was 89.3%, and the longest downtime of 50 hours occurred 2.9 times per year. The subsea pipeline model for multiphase flow simulation was created using field geometry data. As a result of risk analysis of hydrate plugging using subsea pipeline model, hydrate was formed at the end of flowline in 23.2 hours under the condition of 50 hours shutdown. The injection concentration of PVCap was determined based on the PVCap experiment results. The hydrate plugging in subsea pipeline of LNG-FPSO can be completely prevented by injecting PVCap 0.25 wt% 2.9 times per year.
Keywords
LNG-FPSO; flow assurance; hydrate plugging; subsea pipeline; system availability; PVCap;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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