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Investigation on Thermodynamic Equilibrium Conditions of Methane Hydrates in Multiphase Gas-Dominant Pipelines
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-22 , DOI: 10.1021/acsomega.0c04204
Jai Krishna Sahith Sayani 1, 2 , Srinivasa Rao Pedapati 1 , Zamzila Kassim 3, 4 , Bhajan Lal 2, 3
Affiliation  

The estimation of thermodynamic equilibrium conditions of methane hydrates in the presence of crude oil based on experiments is shown in this research work. This pipeline system replicated the gas-dominant multiphase transmission pipelines at deep-sea regions. An experimental study is done by the usage of a Raman gas hydrate reactor. The pressure was maintained in the range of 3–8 MPa for the experimental study. The water cut is kept constant throughout the system as 30%. Initially, the experimental setup is calibrated by using carbon dioxide gas. Then, methane hydrates are formed with and without crude oil. The methane hydrates that are created without the presence of crude oil are validated with simulation that is performed using CSMGEM, PVTSIM software, and literature data. Then, the thermodynamic conditions are found for the methane hydrate formation in the presence of crude oil with an addition of a 15% oil cut to the system. From these results, the phase behavior of a multiphase system is evaluated. The formation of methane hydrates in the system was found to be affected by the presence of an additional oil phase that exhibited an inhibition behavior. This research validates all the multiphase systems that contain similar hydrocarbon and gas compositions.

中文翻译:


多相天然气管道中甲烷水合物热力学平衡条件研究



这项研究工作显示了基于实验的原油存在下甲烷水合物热力学平衡条件的估计。该管道系统复制了深海地区以天然气为主的多相输送管道。通过使用拉曼气体水合物反应器进行了实验研究。实验研究中压力保持在3-8 MPa范围内。整个系统的含水率保持恒定为 30%。最初,使用二氧化碳气体校准实验装置。然后,无论有或没有原油,都会形成甲烷水合物。在不存在原油的情况下产生的甲烷水合物通过使用 CSMGEM、PVTSIM 软件和文献数据进行的模拟进行了验证。然后,在原油存在下向系统中添加 15% 的石油馏分,找到了甲烷水合物形成的热力学条件。根据这些结果,可以评估多相系统的相行为。发现系统中甲烷水合物的形成受到表现出抑制行为的额外油相的存在的影响。这项研究验证了包含相似碳氢化合物和气体成分的所有多相系统。
更新日期:2021-02-02
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