热带海洋学报 ›› 2012, Vol. 31 ›› Issue (5): 74-82.doi: 10.11978/j.issn.1009-5470.2012.05.011

• 海洋矿物资源及开发 • 上一篇    下一篇

南海北部神狐海域天然气水合物热激发开采潜力的数值模拟分析

苏正1, 2, 何勇1, 2, 吴能友1, 2   

  1. 1. 中国科学院广州能源研究所, 可再生能源与天然气水合物重点实验室, 广东 广州 510640; 2. 中国科学院广州天然气水合物研究中心, 广东 广州 510640
  • 收稿日期:2011-07-29 修回日期:2011-10-11 出版日期:2012-11-01 发布日期:2013-02-06
  • 通讯作者: 吴能友, 博士, 研究员。Tel:020-87052746, E-mail: wuny@ms.giec.ac.cn
  • 作者简介:苏正(1980—), 男, 宁夏固原市人, 博士, 副研究员, 主要从事天然气水合物、地热和盆地流体活动的数值模拟研究。
  • 基金资助:
    国家自然科学基金项目(41076037、41276057); 水合物国家专项(GHZ2012006003); 国家自然科学基金-广东联合基金项目(U0933004); 国家重点基础研究计划项目 (2009CB219508);

Numerical simulation on production potential of hydrate deposits by thermal stimulation

SU Zheng1, 2, HE Yong1, 2, WU Neng-you1, 2   

  1. 1. Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; 2. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2011-07-29 Revised:2011-10-11 Online:2012-11-01 Published:2013-02-06

摘要: 天然气水合物作为一种新型替代能源, 如何有效开发成为当前研究的热点, 热激发被认为是除降压法外天然气水合物开采的另一重要途径。目前对于天然气水合物注热开采效率和经济可行性仍没有清楚的认识。构建了通过垂直单井对天然气水合物进行注热开采的物理模型, 通过对物理模型的理想简化, 在水合物藏中划分出一个理想薄层, 对研究的储层体系进行了密集的网格划分, 并以南海北部陆坡神狐海域天然气水合物成藏特征为依据, 利用TOUGH+HYDRATE程序, 数值模拟研究了对天然气水合物藏进行热激发开采的潜力, 并与相同幅度的降压开发进行了效率对比分析。研究显示, 井孔高温热源的辐射半径很小, 水合物受热分解速率缓慢, 而且在注热和降压联合开采中, 注热作业对水合物分解的贡献很低, 水合物分解主要由降压操作引起。

关键词: 天然气水合物, 注热开发, 数值模拟, 神狐海域

Abstract: Natural gas hydrate is a new potential energy, so how the gas can be effectively produced from hydrate deposits becomes a hot research topic. Heat stimulation is regarded as another important way for producing hydrate besides depressurization. However, production efficiency and economic feasibility of gas production by heat stimulation are not well understood. In this paper, a physical model for predicting gas production from hydrate deposits by heat stimulation through a vertical well is constructed. The model defines a laminar hydrate system of unit thickness. The reservoir system is discretized densely. We numerically simulate the production potential of hydrate deposit through thermal stimulation by employing the TOUGH+HYDRATE simulator with the characteristic parameters of Shenhu hydrate on the northern continental slope of the South China Sea. Then, we compare and analyze the efficiency of heat stimulations with a pure depressurization operation. Our research shows that the radioactive radius of the high-temperature heat source at the well is very small and that the hydrate dissociation rate is slow. The contribution of thermal injection operation is very small in the inter-productions of heat stimulation and depressurization, and the hydrate dissociation in the processes are mainly aroused by the operation of depressurization.

Key words: gas hydrate, heat stimulation, numerical simulation, Shenhu area>

中图分类号: 

  • P618.13