化工进展 ›› 2022, Vol. 41 ›› Issue (8): 4111-4119.doi: 10.16085/j.issn.1000-6613.2021-2010

• 能源加工与技术 • 上一篇    下一篇

三维中试装置内水合物降压分解动力学规律

王云飞1(), 孙长宇2, 喻西崇1(), 李清平1, 陈光进2   

  1. 1.中海油研究总院有限责任公司,北京 100028
    2.中国石油大学(北京)化学工程与环境学院,北京 102249
  • 收稿日期:2021-09-23 修回日期:2021-12-17 出版日期:2022-08-25 发布日期:2022-08-22
  • 通讯作者: 喻西崇 E-mail:wangyf93@cnooc.com.cn;yuxch@cnooc.com.cn
  • 作者简介:王云飞(1990—),男,博士后,研究员,主要从事水合物开采、储气方向研究。E-mail:wangyf93@cnooc.com.cn
  • 基金资助:
    国家自然科学基金企业联合项目(U20B2023);中海石油(中国)有限公司科技项目(YXKY-ZX 05 2020)

Analysis of the methane hydrate decomposition kinetics through depressurization method by using a pilot-scale reactor

WANG Yunfei1(), SUN Changyu2, YU Xichong1(), LI Qingping1, CHEN Guangjin2   

  1. 1.CNOOC Research Institute, Beijing 100028, China
    2.College of Chemical Engineering and Environment, China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2021-09-23 Revised:2021-12-17 Online:2022-08-25 Published:2022-08-22
  • Contact: YU Xichong E-mail:wangyf93@cnooc.com.cn;yuxch@cnooc.com.cn

摘要:

利用196L三维装置研究了含下伏气层水合物藏的降压分解规律。对比研究了单竖直井实验和竖直井-水平井双井开采的实验,实验结果表明,过大的降压幅度可能会导致开采井被雾沫夹带的水堵塞,对于含下伏气层的水合物藏,反应釜底部和近井区域由于局部气流速度过快导致更严重的温降。建立了经典格式的分解动力学模型,结果表明,对于三维装置,单独利用推动力和分解速率并不能准确反映水合物实际分解状况。利用水合物剩余分解比例校正后,推动力和分解速率呈线性关系,单井实验所拟合参数k=0.284mol/(min·MPa)与双井降压实验 k=0.279mol/(min·MPa)可以互相验证。

关键词: 水合物, 降压开采, 分解动力学, 中试装置

Abstract:

A pilot-scale reactor with a volume of 196L was adopted to examine the decomposition behavior of hydrate reservoir which contains a bottom gas-rich zone. Exploitation experiments with a single vertical well, and with double well (vertical and horizontal well) were conducted. Results showed that an excessive pressure drop might result in well blocking by the ice which was resulted from foam entrainment. For reservoir with a bottom gas-rich zone, the areas closer to the well and the bottom of the reactor had a greater temperature drop, compared to other areas of the reactor owing to the faster local gas flow rate. The classical decomposition dynamics model was established. Results showed that for the large three-dimensional device, the driving force and decomposition rate could not reflect the actual hydrate decomposition behavior accurately. However, after the driving force was corrected through the residual ration of hydrate, the driving force had a linear relationship with the decomposition rate, and fitting parameters of single well experiment that k=0.284mol/(min·MPa) and double well experiment that k=0.279mol/(min·MPa) can be mutually verified.

Key words: hydrate, exploitation, decomposition dynamics, pilot-scale device

中图分类号: 

  • TE3