草舍泰州组油藏CO2混相驱效果及二次气驱可行性研究

油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (3): 47-50.

草舍泰州组油藏CO₂混相驱效果及二次气驱可行性研究

陈祖华¹,孙雷²,杨正茂¹,王海妹¹,冯洋³,华柑霖⁴

^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

收稿日期:2019-02-02 发布日期:2019-07-02 出版日期:2019-06-26
作者简介:陈祖华(1969-),女,研究员,油气田开发、注CO2提高采收率等研究工作。E-mail: 68835285@qq.com。

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

Chen Zuhua¹,Sun Lei²,Yang Zhengmao¹,Wang Haimei¹,Feng Yang³,Hua Ganlin⁴

^1. Exploration and Development Research Institute, East China Company, SINOPEC, Nanjing, Jiangsu 210011, China
^2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
^3. Yanchang Gas Field, Shaanxi Yanchang Petroleum(Group) Co, LTD., Xi'an, Shaanxi 710075, China
^4. School of Energy, China University of Geosciences, Beijing 100083, China

Received:2019-02-02 Online:2019-07-02 Published:2019-06-26

摘要/Abstract

摘要：

草舍泰州组油藏CO₂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CO₂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,CO₂二次混相驱油效率为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 %。

关键词: 草舍泰州组, CO₂驱, 一次混相驱, 二次混相驱

Abstract:

The CO₂ miscible flooding project in the Taizhou formation of Caoshe oilfield is one of the most successful CO₂ 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 CO₂ 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 CO₂ miscible flooding was 93.4 %, which was 9.73 % higher than that of the first CO₂ 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 CO₂ 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 %.

Key words: Taizhou formation in Caoshe oilfield, CO₂ flooding, first miscible-phases flooding, secondary miscible-phases flooding

中图分类号:

TE357

陈祖华,孙雷,杨正茂等. 草舍泰州组油藏CO₂混相驱效果及二次气驱可行性研究[J]. 油气藏评价与开发, 2019, 9(3): 47-50.

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

图/表 4

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草舍泰州组油藏CO₂混相驱效果及二次气驱可行性研究

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

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