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天然气地球科学 doi: 10.11764/j.issn.1672-1926.2017.06.008

• 天然气开发 • 上一篇    下一篇

不同驱油方式CO2微观分布特征及埋存量研究

郝永卯1，韦馨林1，董承顺2   

  1. 1.中国石油大学(华东)石油工程学院，山东 青岛 266580；
    2.辽河油田工程技术处，辽宁 盘锦 124010
  • 收稿日期:2016-12-03 修回日期:2017-05-09 出版日期:2017-06-10 发布日期:2017-06-10
  • 作者简介:郝永卯(1976-)，男，河北衡水人，副教授，博士，主要从事油气田开发理论与方法、CO2提高采收率与地质埋存理论与技术以及天然气水合物开采理论与技术研究.E-mail：haoyongmao@163.com.
  • 基金资助:

    国家科技重大专项(编号：2016ZX05056-001)资助.

Research on the microscopic distribution characteristics and storage capacity of CO2 with different displacement methods

Hao Yong-mao1，Wei Xin-lin1，Dong Cheng-shun2   

  1. 1.School of Petroleum Engineering,China University of Petroleum,Qingdao 266580,China;
    2.Engineering Technology Department of Liaohe Oilfield Company,Panjin 124010,China
  • Received:2016-12-03 Revised:2017-05-09 Online:2017-06-10 Published:2017-06-10

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773

摘要：

利用高温高压微观可视化实验研究不同驱油方式下CO2的分布特征及埋存机制，并通过图像分析计算CO2的埋存潜力。实验结果表明：CO2非混相驱时，自由态CO2主要分布于模型顶部，埋存机制主要为构造埋存；CO2混相驱时，模型中上部主要聚集自由态CO2，而中下部为油气混相带，埋存机制主要为构造埋存及原油中的溶解埋存；非混相水驱交替时的自由态CO2波及区从主流线向两侧扩散，越靠近采出端扩散程度越低，并且CO2溶解于波及区内的注入水，埋存机制主要为构造埋存及水中的溶解埋存；混相水气交替和水驱后CO2混相驱时CO2的分布状况基本一致，混相态和自由态CO2基本都离散分布于模型中，同时注入水中溶有CO2，埋存机制主要为构造埋存及油水中的溶解埋存。埋存量计算结果表明，混相条件下埋存量远高于非混相条件，构造埋存是最主要的埋存机制，同时水驱后CO2混相驱的埋存量较高，说明水驱后的油藏也是CO2埋存的理想场所。

关键词: 微观实验, CO2埋存, 驱油方式, CO2分布特征, 埋存机制, 埋存量

Abstract:

The form and distribution of CO2 under different displacement methods has been studied by visualization experimental equipment with the condition of high pressure and high temperature,and the storage capacity of CO2 has also been investigated by image analysis technology.Experimental results show that,free state CO2 mainly distributed on the top of the model under the immiscible displacement,and the storage mechanism is structure and stratigraphic trapping.While under the miscible displacement it mainly distributed on the middle and upper parts of the model,and the oil and CO2 miscible zone will locate in the lower part of the model,and the storage mechanism is structure and stratigraphic trapping and dissolution trapping in the remaining oil.During the experiment of water alternating gas(WAG) displacement,the sweep area of free state CO2 spreads from the mainstream line to both sides,the diffusion degree gradually decreases from the inject end to the output end,and the CO2 is dissolved in the injected water,and the storage mechanism is structure and stratigraphic trapping,dissolution trapping in the injected water and the remaining oil.The distribution of CO2 under the WAG miscible displacement and CO2 miscible displacement after water displacement is consistent,in which the free state CO2 and miscible CO2 discretely distributed in the model,and the CO2 was dissolved in the injected water,and the storage mechanism is structure and stratigraphic trapping,dissolution trapping in the injected water and the remaining oil.The calculation of storage capacity shows that,the storage capacity under the miscible condition is higher than that under the immiscible condition,and structure trapping is the main form of CO2 storage.The storage capacity of CO2 miscible displacement after water flooding is excellent,which means the reservoir after water flooding is anideal place for CO2 storage.

Key words: Microscopic experiment, CO2 , storage, Displacement methods, CO2 distribution characteristics, Storage mechanism, Storage capacity

中图分类号: 

  • TE321

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