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Modeling of multiphase flow in marine gas hydrate production system and its application to control the production pressure difference
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jngse.2020.103687
Zheng Liu , Baojiang Sun , Zhiyuan Wang , Wenqiang Lou , Jianbo Zhang

Abstract The accuracy control of the production pressure difference is of great importance to the efficient development of marine gas hydrates through depressurization. But from the field trial production, the existing control method of bottom hole pressure is difficult to achieve the expected depressurization target. To this end, a transient gas-liquid two-phase flow model in marine gas hydrate production system was established, which considers the coupling interactions of the wellbore, the formation and the downhole electric submersible pump (ESP). Besides, an automatic control method of production pressure differential was proposed through real-time optimization of the pump displacement. Using the model, a series of numerical simulations were performed to study the multiphase flow rules in the production well. The results indicated the depressurization process could be divided into four stages based on the characteristics of gas-liquid flow in different pipelines. During the depressurization, the liquid level in the well exhibited a trend of first falling and then rising, and may eventually reach the wellhead for continuous drainage. In addition, sensitivity analysis showed that the smaller the pipe diameter, the higher the gas-liquid separation efficiency, and the greater the possibility of continuous drainage from the gas production pipeline. As the result, it was verified that the proposed model and method can achieve the expected depressurization well, which will provide useful references for the production design during the development of marine natural gas hydrate resources.

中文翻译:

海洋天然气水合物生产系统多相流建模及其在生产压差控制中的应用

摘要 生产压差的准确控制对于海洋天然气水合物减压高效开发具有重要意义。但从现场试生产来看,现有的井底压力控制方法难以达到预期的降压目标。为此,建立了海洋天然气水合物生产系统瞬态气液两相流动模型,该模型考虑了井筒、地层和井下电潜泵(ESP)的耦合相互作用。此外,通过泵排量的实时优化,提出了生产压差的自动控制方法。利用该模型,进行了一系列数值模拟,研究了生产井中的多相流动规律。结果表明,根据不同管道气液流动的特点,可将降压过程分为四个阶段。降压过程中,井内液位呈先下降后上升的趋势,最终可能到达井口继续排水。此外,敏感性分析表明,管径越小,气液分离效率越高,采气管道连续排放的可能性越大。结果表明,所提出的模型和方法能够很好地达到预期的降压效果,为海洋天然气水合物资源开发过程中的生产设计提供有益的参考。
更新日期:2021-01-01
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