Physical simulation experiment of oil migration in porous media of tight reservoir

被引：3
|
作者：
Zha M. [1 ]
Su Y. [1 ]
Qu J. [1 ]
Ding X. [1 ]
Zhu Y. [2 ]
机构：
[1] School of Geosciences in China University of Petroleum(East China), Qingdao
[2] State Key Laboratory of Continental Dynamics, Northwest University, Xi'an
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2019年 / 43卷 / 05期
关键词：
Icro porous media; Il migration; Tight reservoir; Uthentic sandstone micro-model;
D O I：
10.3969/j.issn.1673-5005.2019.05.001
中图分类号：
学科分类号：
摘要：
Experiments of oil displacing water in authentic sandstone micro-models were conducted under various injection pressures, aiming to visualize the process of oil migration in tight reservoirs. Factors controlling the oil migration process in tight reservoirs were elucidated in combination with thin sections and micro-CT image analyses. The results suggest that oil migration in the porous media shows an obvious jump pattern at low injection pressure. The jump event occurs with breaking through throat, filling pore body and occurring snap-off. Multiple and repeated jump events result in the movement of the oil-water interface. However, there is no uniform oil-water interface, and the displacing rate of water by oil varies in the direction of migration. Oil preferentially enters into the connected large pores, forming the dominant migration path. As a result, the majority of oil clusters are isolated in single pores or distribute in several connected pores. The divergence and convergence of these migration paths result in these isolated oil clusters converging slowly into continuous phases under high injection pressure, and oil clusters present as the mesh network. The oil migration pattern in the porous media is dominantly controlled by local capillary pressure, which is associated with the pore structure. Meanwhile, the external driving force provides necessary energy supply for oil migration. © 2019, Periodical Office of China University of Petroleum. All right reserved.
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页码：1 / 10
页数：9
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