SCI和EI收录∣中国化工学会会刊

›› 2009, Vol. 17 ›› Issue (1): 128-135.

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The Dependence of the Dissociation Rate of Methane-SDS Hydrate below Ice Point on Its Manners of Forming and Processing

王秀林1, 陈光进1, 孙长宇1, 杨兰英1, 马庆兰1, 陈俊1, 刘鹏1, 唐绪龙1, 赵焕伟1, 陈卫东2   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2. Development Engineering Institute, China Oilfield Service Limited, Beijing 101149, China
  • 收稿日期:2008-06-11 修回日期:2008-12-02 出版日期:2009-01-28 发布日期:2009-01-28
  • 通讯作者: CHEN Guangjin, E-mail: gjchen@cup.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (20506016,20676145,U0633003);the National High Technology Research and Development Program of China (2006AA09A208);Program for New Century Excellent Talents in University of the State Ministry of Education (NCET-07-0842);the Foundation for the Authors of National Excellent Doctoral Dissertation of the People’s Republic of China(200447)

The Dependence of the Dissociation Rate of Methane-SDS Hydrate below Ice Point on Its Manners of Forming and Processing

WANG Xiulin1, CHEN Guangjin1, SUN Changyu1, YANG Lanying1, MA Qinglan1, CHEN Jun1, LIU Peng1, TANG Xu-long1, ZHAO Huanwei1, CHEN Weidong2   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2. Development Engineering Institute, China Oilfield Service Limited, Beijing 101149, China
  • Received:2008-06-11 Revised:2008-12-02 Online:2009-01-28 Published:2009-01-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (20506016,20676145,U0633003);the National High Technology Research and Development Program of China (2006AA09A208);Program for New Century Excellent Talents in University of the State Ministry of Education (NCET-07-0842);the Foundation for the Authors of National Excellent Doctoral Dissertation of the People’s Republic of China(200447)

摘要: The dissociation rates of methane hydrates formed with and without the presence of sodium dodecyl sulfate(methane-SDS hydrates),were measured under atmospheric pressure and temperatures below ice point to investigate the influence of the hydrate production conditions and manners upon its dissociation kinetic behavior.The experimental results demonstrated that the dissociation rate of methane hydrate below ice point is strongly dependent on the manners of hydrate formation and processing.The dissociation rate of hydrate formed quiescently was lower than that of hydrate formed with stirring;the dissociation rate of hydrate formed at lower pressure was higher than that of hydrate formed at higher pressure;the compaction of hydrate after its formation lowered its stability,i.e.,increased its dissociation rate.The stability of hydrate could be increased by prolonging the time period for which hydrate was held at formation temperature and pressure before it was cooled down,or by prolonging the time period for which hydrate was held at dissociation temperature and formation pressure before it was depressurized to atmospheric pressure.It was found that the dissociation rate of methane hydrate varied with the temperature(ranging from 245.2 to 272.2 K) anomalously as reported on the dissociation of methane hydrate without the presence of surfactant as kinetic promoter.The dissociation rate at 268 K was found to be the lowest when the manners and conditions at which hydrates were formed and processed were fixed.

关键词: hydrate, kinetics, dissociation, storage, surfactant

Abstract: The dissociation rates of methane hydrates formed with and without the presence of sodium dodecyl sulfate(methane-SDS hydrates), were measured under atmospheric pressure and temperatures below ice point to investigate the influence of the hydrate production conditions and manners upon its dissociation kinetic behavior.The experimental results demonstrated that the dissociation rate of methane hydrate below ice point is strongly dependent on the manners of hydrate formation and processing.The dissociation rate of hydrate formed quiescently was lower than that of hydrate formed with stirring;the dissociation rate of hydrate formed at lower pressure was higher than that of hydrate formed at higher pressure;the compaction of hydrate after its formation lowered its stability, i.e., increased its dissociation rate.The stability of hydrate could be increased by prolonging the time period for which hydrate was held at formation temperature and pressure before it was cooled down, or by prolonging the time period for which hydrate was held at dissociation temperature and formation pressure before it was depressurized to atmospheric pressure.It was found that the dissociation rate of methane hydrate varied with the temperature(ranging from 245.2 to 272.2 K) anomalously as reported on the dissociation of methane hydrate without the presence of surfactant as kinetic promoter.The dissociation rate at 268 K was found to be the lowest when the manners and conditions at which hydrates were formed and processed were fixed.

Key words: hydrate, kinetics, dissociation, storage, surfactant