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Insights into kinetic inhibition effects of MEG, PVP, and L-tyrosine aqueous solutions on natural gas hydrate formation
Petroleum Science ( IF 5.6 ) Pub Date : 2020-10-01 , DOI: 10.1007/s12182-020-00515-0
Amir Saberi , Abdolmohammad Alamdari , Ali Rasoolzadeh , Amir H. Mohammadi

It is necessary to understand all the prerequisites, which result in gas hydrate formation for safe design and control of a variety of processes in petroleum industry. Thermodynamic hydrate inhibitors (THIs) are normally used to preclude gas hydrate formation by shifting hydrate stability region to lower temperatures and higher pressures. Sometimes, it is difficult to avoid hydrate formation and hydrates will form anyway. In this situation, kinetic hydrate inhibitors (KHIs) can be used to postpone formation of gas hydrates by retarding hydrate nucleation and growth rate. In this study, two kinetic parameters including natural gas hydrate formation induction time and the rate of gas consumption were experimentally investigated in the presence of monoethylene glycol (MEG), L-tyrosine, and polyvinylpyrrolidone (PVP) at various concentrations in aqueous solutions. Since hydrate formation is a stochastic phenomenon, the repeatability of each kinetic parameter was evaluated several times and the average values for the hydrate formation induction times and the rates of gas consumption are reported. The results indicate that from the view point of hydrate formation induction time, 2 wt% PVP and 20 wt% MEG aqueous solutions have the highest values and are the best choices. It is also interpreted from the results that from the view point of the rate of gas consumption, 20 wt% MEG aqueous solution yields the lowest value and is the best choice. Finally, it is concluded that the combination of PVP and MEG in an aqueous solution has a simultaneous synergistic impact on natural gas hydrate formation induction time and the rate of gas consumption. Furthermore, a semi-empirical model based on chemical kinetic theory is applied to evaluate the hydrate formation induction time data. A good agreement between the experimental and calculated hydrate formation induction time data is observed.



中文翻译:

深入了解MEG,PVP和L-酪氨酸水溶液对天然气水合物形成的动力学抑制作用

有必要了解所有前提条件,这些前提条件会导致形成天然气水合物,以便安全设计和控制石油工业中的各种过程。热力学水合物抑制剂(THIs)通常用于通过将水合物稳定区域转移至较低温度和较高压力来防止气体水合物形成。有时,很难避免水合物的形成,反而会形成水合物。在这种情况下,动力学水合物抑制剂(KHIs)可用于通过阻止水合物成核和生长速率来推迟气体水合物的形成。在这项研究中,通过实验研究了在存在单乙二醇(MEG),L-酪氨酸,和聚乙烯吡咯烷酮(PVP)在水溶液中的浓度不同。由于水合物的形成是一种随机现象,因此对每个动力学参数的重复性进行了几次评估,并报告了水合物形成诱导时间和气体消耗速率的平均值。结果表明,从水合物形成诱导时间的观点来看,2wt%的PVP和20wt%的MEG水溶液具有最高的值并且是最佳的选择。从结果还可以理解,从气体消耗速率的观点来看,20wt%的MEG水溶液产生最低的值,并且是最佳选择。最后,结论是PVP和MEG在水溶液中的组合对天然气水合物形成诱导时间和气体消耗速率具有同时的协同影响。此外,基于化学动力学理论的半经验模型被用于评估水合物形成诱导时间数据。观察到实验和计算的水合物形成诱导时间数据之间的良好一致性。

更新日期:2020-10-02
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