Effects of CO<sub>2</sub> miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield

Chen Zuhua; Sun Lei; Yang Zhengmao; Wang Haimei; Feng Yang; Hua Ganlin

doi:10.13809/j.cnki.cn32-1825/te.2019.03.009

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Effects of CO₂ miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield

更新时间：2025-12-05

- Effects of CO₂ miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield
- Petroleum Reservoir Evaluation and Development Vol. 9, Issue 3, Pages: 47-50(2019)
- 作者机构：
  
  1. 中国石化华东油气分公司,江苏,南京,210011
  2. 西南石油大学油气藏地质及开发国家重点实验室,四川,成都,610500
  3. 陕西延长石油（集团）有限责任公司延长气田,陕西,西安,710075
  4. 中国地质大学能源学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2019.03.009
  CLC： TE357
- Published：2019
- 稿件说明：
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Chen Zuhua, Sun Lei, Yang Zhengmao, et al. Effects of CO₂ miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 47-50.
DOI：

Chen Zuhua, Sun Lei, Yang Zhengmao, et al. Effects of CO₂ miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 47-50. DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.009.

摘要

草舍泰州组油藏CO

混相驱提高采收率项目是国内较为成功的项目之一。针对一次混相驱后剩余油分布复杂、后期气窜严重等问题

开展二次混相驱的可行性研究。金相显微镜下观测真实岩心CO

混相驱的流动过程具有微观分维的特征

剩余油以薄膜状、孤立点珠状附着在岩石孔隙表面

二次混相驱油效率为93.40 %

比一次混相驱油效率提高9.73 %;密闭取心显示平均残余油饱和度为30.8 %

III油组潜力较大。设计二次混相驱油可行性方案

采用分层系开发动用底部油藏

高部位注气抑制重力超覆

水气交替减缓气窜

全过程防窜调整剖面等方式

预计可进一步提高采收率8 % ~ 10 %。

Abstract

The CO

miscible flooding project in the Taizhou formation of Caoshe oilfield is one of the most successful CO

EOR projects in China. The feasibility study on the secondary miscible flooding was carried out to settle the issues of complex remaining oil distribution and severe gas channeling in the later stage after first miscible flooding. The characteristic of microscopic fractal dimension in the CO

miscible flooding process of real core sample was observed through metalloscope. The remaining oil types attaching to the pore surface of rock took on the forms of thin film and isolated beads. The displacement efficiency of the secondary CO

miscible floo

ding was 93.4 %

which was 9.73 % higher than that of the first CO

miscible flooding. The average residual oil saturation was 30.8 % in sealed coring test

indicating great potential of III formation. A feasible development plan for secondary miscible-phases flooding was proposed to develop the stratified reservoirs at the bottom position. The CO

injection on the higher position was adopt to suppress gas gravity overlap

and the water alternating gas was applied to slow down the gas channeling. Furthermore

the injection profile was adjusted during the whole process of gas injection. The incremental recovery ratio was estimated to be 8 % ~ 10 %.

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Effects of CO2 miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield

DOI：10.13809/j.cnki.cn32-1825/te.2019.03.009

摘要

Abstract

关键词

Keywords

references

Effects of CO₂ miscible displacement and feasibility study of secondary gas flooding of Taizhou formation in Caoshe oilfield