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- W2760646369 abstract "During the development of deep-sea petroleum industry, wax and hydrate are prone to form at the same time in the transportation system from reservoir to downstream equipment under high pressure and low temperature condition for the petroleum reservoir with high wax content, high pour point and high viscosity, which will increase the risk of plug or blockage and enhance the safety hazards of the system. Therefore, it is significant to investigate the characteristics of the coexistence system with wax and hydrate, which is also one of the important issues in flow assurance problems. The studies on wax and hydrate separately as well as the coupling studies in the coexistence system from aspects of thermodynamic and kinetics were reviewed and commented, combined with some initial experiments of this coexistence system carried out in high-pressure reactor and flow loop. Several thermodynamic models, like Wilson model and UNIQUAC model, are established or modified to describe wax solid phase more accurately. The classical thermodynamic models for hydrate formation prediction include vdW-P model, which is the most extensively used one, and Chen-Guo model, which is more simple and convenient to use based on a two-step mechanism. Based on the above models, the coupling study of wax and hydrate in thermodynamic aspect thus needs a roubust flash algorithm to characterize complex systems where several phases, i.e. vapor, water, hydrate, wax, liquid hydrocarbon may coexist. Mutual effects of wax and hydrate are explored by using the integrated thermodynamic model and algorithm. A lot of researches have been done on kinetics of wax deposition and hydrate formation separately. Single-phase pipe flow and multiphase pipe flow experiments have been carried out to explore the effects of such factors as molecular diffusion, shear dispersion, adhesion, flow pattern on wax deposition. The non-stoichiometry hydrate formation includes nucleation and growth. Based on experimental studies, physical modeling and mathematical modeling have been done to describe the kinetics of hydrate formation. At present, only a few studies of coupling kinetics of wax deposition and hydrate formation are reported, which are in an early stage of exploration and research. There is no systematic research achievement and no definite conclusion about the dynamic interaction between wax and hydrate. Some advanced experimental means, such as FBRM, PVM, MMF, can provide information in micro level. The main issues to be researched in the future were proposed, which should be based on the independent researches of thermodynamics and kinetics of wax and hydrate. For the study on coupling thermodynamics, a robust and valid coupling thermodynamic model should be established to understand the interaction mechanism of phase behaviors between wax and hydrate, by using the improved model for describing the non-ideality of the liquid and solid phases and focusing on the component changing in each phase. For the study on coupling kinetics, the microscopic distribution mechanism of the solid particles and emulsion phase in the coexistence system should be investigated, and the diffusion mechanism of wax, the adsorption and growth characteristics of hydrate interface should be explored, with the help of visual testing and equipment, from the two aspects of the influence of wax on hydrates formation and hydrate on wax precipitation and deposition, to obtain the interaction mechanism of kinetics behaviors between wax and hydrate." @default.
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- W2760646369 date "2017-09-28" @default.
- W2760646369 modified "2023-09-27" @default.
- W2760646369 title "Advances in coupling thermodynamics and kinetics studies of wax precipitation-deposition and hydrate nucleation-formation" @default.
- W2760646369 doi "https://doi.org/10.1360/n972017-00421" @default.
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