Hits:

Indexed by:会议论文

Date of Publication:2015-01-01

Included Journals:CPCI-S

Page Number:916-920

Key Words:high saturation; hydrate formation; secondary pressurization; surfactant; superheated ice

Abstract:In this paper, a series of experiments have been carried out to explore the impact factors such as secondary pressurization, superheated ice, and surfactant on the hydrate saturation. The change of pressure and temperature can be collected by computer and then the conversion of ice powders can be calculated by measuring gas consumption during hydrate formation (pVT method), which indicates the saturation of gas hydrate. The results indicated that: (a) Secondary pressurization can improve the saturation of gas hydrate to a certain extent. When the initial pressure is not high, the secondary pressurization has an obvious effect on improving the saturation of gas hydrate, and relatively shortens the time to achieve the same saturation on the condition of high initial pressures; (b) The appearance of superheated ice will obviously increase the hydrate saturation. Rising temperature leads to the formation of superheated ice during gas hydrate formation. It is presumed that quasi liquid layer generates between hydrate layer and unreacted ice particles, which promotes the formation of hydrate and improves the saturation of hydrate; (c) Superheated ice has a more obvious effect on improving the methane hydrate saturation than that of secondary pressurization. (d) Different concentrations of SDS surfactant have clearly influence on the saturation of gas hydrate and there is an optimal concentration to promote the hydrate formation. In this paper, the best concentration of SDS surfactant is 300ppm.