Insights into kinetic inhibition effects of MEG,PVP,and L-tyrosine aqueous solutions on natural gas hydrate formation  

作　　者：Amir Saberi Abdolmohammad Alamdari Ali Rasoolzadeh Amir H.Mohammadi 

机构地区：[1]Department of Natural Gas Engineering,School of Chemical and Petroleum Engineering,Shiraz University,Shiraz,71345,Iran [2]Department of Process Engineering,National Iranian Gas Company(NIGC),South Pars Gas Complex(SPGC)Phases 4&5,Bushehr,75391/311,Iran [3]Discipline of Chemical Engineering,School of Engineering,University of KwaZulu-Natal,Howard College Campus,King George V Avenue,Durban,4041,South Africa

出　　处：《Petroleum Science》2021年第2期495-508,共14页石油科学（英文版）

摘　　要：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.

关 键 词：Gas hydrate Clathrate hydrate Natural gas Kinetic hydrate inhibitor(KHI) Induction time Kinetics 

分 类 号：TE37[石油与天然气工程—油气田开发工程]