首页 | 本学科首页   官方微博 | 高级检索  
     

天然气水合物降压分解过程的数值模拟
引用本文:刘建军,邵祖亮,郑永香. 天然气水合物降压分解过程的数值模拟[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 80-90. DOI: 10.11885/j.issn.1674-5086.2016.06.09.01
作者姓名:刘建军  邵祖亮  郑永香
作者单位:1. "油气藏地质及开发工程"国家重点实验室·西南石油大学, 四川 成都 610500;2. 西南石油大学地球科学与技术学院, 四川 成都 610500
基金项目:国家自然科学基金(51174170)。
摘    要:天然气水合物分解是一个复杂的相变传热传质过程。在考虑热传导、热对流、气液两相渗流和水合物分解动力学等因素的情况下,建立了天然气水合物降压分解的三维数学模型。应用数值模拟的方法,分析了井底压力、水合物初始饱和度和储层绝对渗透率对分解的影响。结果表明,井底压力越小,水合物分解越快,储层温度和压力下降也越快;水合物的初始饱和度较大时,前期分解速度较快,后期分解速度变慢,过高的初始饱和度反而会抑制水合物的分解;渗透率对产气量影响不大,但当渗透率过低时,采用降压法开采的生产效率较低,可以考虑降压法与其他方法结合使用。

关 键 词:天然气水合物  降压开采  数学模型  参数  温度场  应力场  
收稿时间:2016-06-09

Numerical Simulation of the Decomposition of Natural Gas Hydrates by Depressurization
LIU Jianjun,SHAO Zuliang,ZHENG Yongxiang. Numerical Simulation of the Decomposition of Natural Gas Hydrates by Depressurization[J]. Journal of Southwest Petroleum University(Seience & Technology Edition), 2017, 39(1): 80-90. DOI: 10.11885/j.issn.1674-5086.2016.06.09.01
Authors:LIU Jianjun  SHAO Zuliang  ZHENG Yongxiang
Affiliation:1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
Abstract:Natural gas hydrate decomposition is a complicated process involving heat and mass transfer and phase transitions. We established a three-dimensional mathematical model for the gas hydrate decomposition by depressurization taking factors such as heat conduction, heat convection, gas-liquid two-phase flow, and hydrate decomposition kinetics into consideration. The effects of the bottom hole pressure, initial hydrate saturation, and absolute permeability of the reservoir on the decomposition results were analyzed using numerical simulation. The results showed that the lower the bottom hole pressure is, the faster are the gas production rate and the reservoir temperature and pressure decrease. When the initial saturation of the gas hydrate is relatively large, the decomposition rate of the early stage is faster, but that of the later stage is slower. When it is too high, it will inhibit the decomposition of the gas hydrate. The absolute permeability has little impact on the gas production; however, when the permeability is too low, the production efficiency will be lower. Therefore, a combination of the depressurization method and other methods can be used.
Keywords:natural gas hydrate  depressurization  mathematical model  parameters  temperature field  stress field  
本文献已被 CNKI 等数据库收录!
点击此处可从《西南石油大学学报(自然科学版)》浏览原始摘要信息
点击此处可从《西南石油大学学报(自然科学版)》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号