Session 4 - Oral 7
Effects of Nonionic anti-agglomerants on the interactions between methane hydrate particles and water droplets
Zhao Shuai，Liu Chenwei，Li Mingzhong
College of Petroleum Engineering, China university of petroleum, Qingdao, Shandong, China
Abstract: In the present work, the effects of two kinds of nonionic anti-agglomerants, Coconut Diethanol Amide (CDEA) and Sorbitan Monooleate (Span80), on the interactions between methane hydrate particles and droplets at the condition of 3.37 MPa and 1.7℃ in mineral oil were initially investigated using a high-pressure micro mechanical force device (HP-MMF). The corresponding influencing mechanisms were discussed in conjunction with capillary force model and interfacial tension measurements. It was found that the hydrate-droplet adhesion force increased firstly with CDEA concentration (＜0.02 wt.%) due to the rapid solidification of droplets. With the CDEA concentration increased from 0.02 wt.% to 0.03 wt.%, the adhesion force decreased by 1.4-1.7× due to the significant reduction in interfacial tension. The absorption of Span80 on the droplet surface can render the interfaces more stable, preventing the effective wetting of water on hydrate particle. Large load force can rupture the interface and the interface strength increase with Span 80 concentration at the experimental condition (0.01 wt.%-0.1 wt.%). The measurements and observations in present work can provide new insight into the mechanism of nonionic anti-agglomerants on inhibiting natural gas hydrate agglomeration.
Keywords: Nonionic anti-agglomerants，Gas hydrate，High-pressure，Micro mechanical force，Flow assurance