石油学报 ›› 2009, Vol. 30 ›› Issue (1): 84-87,91.DOI: 10.7623/syxb200901017

• 油田开发 • 上一篇    下一篇

氮气泡沫体系稳定性的影响因素研究

赵仁保1,2, 岳湘安1,2, 柯文奇1, 侯永利1   

  1. 1. 中国石油大学石油工程教育部重点实验室, 北京, 102249;
    2. 中国石油大学提高采收率研究中心, 北京, 102249
  • 收稿日期:2008-02-18 修回日期:2008-06-26 出版日期:2008-11-25 发布日期:2010-05-21
  • 作者简介:赵仁保,男,1971年9月生,1997年获中国科学院新疆化学所有机化学专业硕士学位,2006年获中国石油大学(北京)油气田开发专业博士学位,现为中国石油大学(北京)讲师,主要从事油气田开发及油田化学领域的研究工作.E-mail:zhaorenbao@rip.sina.com
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2006CB705805)“CO2驱替过程中多相多组分非线性渗流机理和规律”部分成果

Study on influence factors for stability of nitrogen foam system

ZHAO Renbao1,2, YUE Xiang'an1,2, KE Wenqi1, HOU Yongli1   

  1. 1. Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China;
    2. Enhanced Oil Recovery Center, China University of Petroleum, Beijing 102249, China
  • Received:2008-02-18 Revised:2008-06-26 Online:2008-11-25 Published:2010-05-21

摘要:

利用填砂管研究了不同注气压差下多孔介质中泡沫的产生及其对气体阻力特性的影响,并对泡沫在烧杯及多孔介质中的稳定性进行了对比评价。结果表明,随着氮气注入压差的增加,泡沫对气体的初始残余阻力系数呈幂指数增加;而其残余阻力系数(对气和液)随时间均呈幂指数下降。泡沫在体相中的稳定性远低于多孔介质,且随着环境压力的增大,泡沫的稳定性呈线性增大。基于简单的孔隙模型分析可知,孔隙介质中良好的分散条件及在分散过程中具有的较厚液膜是其稳定性远远高于体相中的重要原因。孔隙和喉道半径比值越大,则孔隙中的气体附加压力越大,泡沫的初始残余阻力系数将越大;吼道越长,泡沫聚并的几率降低,其稳定性增大。若孔隙网络中非均质性越强,则孔隙中气体压差越大,不同孔隙中气体聚并的几率增大,泡沫的稳定变差。

关键词: 氮气泡沫, 多孔介质, 注入压差, 残余阻力系数, 泡沫稳定性, 实验研究

Abstract:

The gas-resistance characteristics of nitrogen foam produced in sand pack was studied at different gas injection pressure. The stability evaluation of foam in beaker and porous medium indicated that the initial residual resistance factor of foam to gas increased in power exponent with the increment of gas injection pressure. The residual resistance factor of foam to gas and water decreased in power exponent with equilibrium time. The stability of foam in beaker was greatly lower than that in the porous medium and increased linearly with the enhancement of environment pressure. The analysis on a simple pore model showed that good dispersion conditions and thicker membrane in the porous medium could be the main causes for above phenomena. The initial resistance factor of foam increased with the pore-throat ratio, and coalesce probability declined with the rising of throat length, which thus improved the stability of foam. The greater the heterogeneity of reservoir in pore scale network, the larger the gas pressure difference in pores. When the coalesce probability of gas enhancement gets bigger, the stability of foam will get worse.

Key words: nitrogen foam, porous medium, injection pressure difference, residual resistance factor, foam stability, experiment study

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