Gravity assisted gas injection:assessment model and experimental study

被引：0

作者：

Ren S. ^{[1
]}

Liu Y. ^{[1
]}

Zhang L. ^{[1
]}

Cui G. ^{[1
]}

Gong Z. ^{[1
]}

Wang Y. ^{[1
]}

Han B. ^{[1
]}

机构：

[1] School of Petroleum Engineering in China University of Petroleum(East China), Qingdao

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2018年 / 42卷 / 04期

关键词：

Assessment model; Gravity assisted gas injection model; Improve displacement efficiency; Influencing factors; Laboratory experiment;

D O I：

10.3969/j.issn.1673-5005.2018.04.007

中图分类号：

学科分类号：

摘要：

In this study, laboratory experiments were conducted to investigate the displacement efficiency and mechanisms of GAGI, and the effects of dip angle, injection rate and oil viscosity on oil recovery were tested. The residual oil distribution after gas displacement and overall oil production were analyzed to reveal the EOR mechanisms of GAGI. A quantified GAGI assessment model (the NGAGI number) was proposed, in which the geological and operational parameters were considered, such as dip angle, the density defference between the displacement and displaced fluids, oil layer permeability, crude oil viscosity and injection rate. The experimental results show that large dip angle, low injection rate and low oil viscosity can stabilize the gas/oil contact and improve oil recovery, and the residual oil saturation can be less than 10% after gas displacement. The experimental and field data indicate that gravity stablized gas injection can be realized when the NGAGI number is greater than 1. The proposed NGAGI model can be used as a creterion to assess the stablity and efficiency of GAGI for field project design and operation. © 2018, Periodical Office of China University of Petroleum. All right reserved.

引用

页码：59 / 66

页数：7

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