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Effect of asphaltenes on growth behavior of methane hydrate film at the oil-water interface
Energy ( IF 9.0 ) Pub Date : 2023-11-23 , DOI: 10.1016/j.energy.2023.129734
Shuang Liang , Xingxun Li , Cunning Wang , Xuqiang Guo , Xu Jiang , Qingping Li , Guangjin Chen , Changyu Sun

Investigation of the effect of asphaltenes, the natural surfactant in crude oil, on the methane hydrate formation is crucial for flow assurance in deep-water oil and gas field. However, most of recent studies on hydrate growth mainly focused on the impact of artificial and commercial surfactants. Limited attention has been given to the effect of the important natural surfactants presented in crude oil on hydrate film growth, such as asphaltenes. In this study, the influences of dissolved asphaltenes on the properties of oil-water interface and the growth of methane hydrate film were investigated. The morphology of methane hydrate film on the water droplet in the oil phase with different asphaltene concentrations was in-situ visualized in a visual autoclave equipped with microscopic imaging, and the lateral growth rate of the methane hydrate film was measured. The results showed that the addition of asphaltenes could increase the hydrophobicity of the methane hydrate film, inhibit the growth of hydrate, and change the morphology of the hydrate film. The growth rate of the hydrate film was negatively correlated with the asphaltene concentration (0–200 ppm), but stabilized above 200 ppm. In addition, this inhibition effect on the lateral growth rate was negatively correlated with temperature.



中文翻译:

沥青质对油水界面甲烷水合物膜生长行为的影响

研究沥青质(原油中的天然表面活性剂)对甲烷水合物形成的影响对于深水油气田的流动保证至关重要。然而,最近大多数关于水合物生长的研究主要集中在人造和商业表面活性剂的影响上。人们对原油中重要的天然表面活性剂(例如沥青质)对水合物膜生长的影响的关注有限。本研究研究了溶解沥青质对油水界面性质和甲烷水合物膜生长的影响。在配备显微成像的可视高压釜中对不同沥青质浓度的油相水滴上的甲烷水合物膜的形貌进行原位可视化,并测量甲烷水合物膜的横向生长速率。结果表明,沥青质的添加可以增加甲烷水合物膜的疏水性,抑制水合物的生长,改变水合物膜的形貌。水合物膜的生长速率与沥青质浓度(0-200 ppm)负相关,但稳定在200 ppm以上。此外,这种对侧向生长速率的抑制作用与温度呈负相关。

更新日期:2023-11-23
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