CO2 assisted steam flooding in late steam flooding in heavy oil reservoirs

作     者：XI Changfeng QI Zongyao ZHANG Yunjun LIU Tong SHEN Dehuang MU Hetaer DONG Hong LI Xiuluan JIANG Youwei WANG Hongzhuang XI Changfeng;QI Zongyao;ZHANG Yunjun;LIU Tong;SHEN Dehuang;MU Hetaer;DONG Hong;LI Xiuluan;JIANG Youwei;WANG Hongzhuang

作者机构：State Key Laboratory of Enhanced Oil RecoveryPetroChina Research Institute of Exploration&DevelopmentBeijing 100083China Research Institute of Petroleum Exploration&DevelopmentPetroChinaBeijing 100083China Research Institute of Petroleum Exploration&DevelopmentPetroChina Xinjiang Oilfield CompanyKaramary 834000China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2019年第46卷第6期

页      面：1242-1250页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0820[工学-石油与天然气工程] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0814[工学-土木工程] 082002[工学-油气田开发工程] 

基　　金：Supported by the China National Science and Technology Major Project(2016ZX05012-002) 

主　　题：heavy oil reservoir three-dimensional physical simulation experiment steam flooding CO2 assisted steam flooding steam chamber steam(CO2)chamber overriding gravity drainage 

摘      要：To improve the oil recovery and economic efficiency in heavy oil reservoirs in late steam flooding,taking J6 Block of Xinjiang Oilfield as the research object,3D physical modeling experiments of steam flooding,CO2-foam assisted steam flooding,and CO2 assisted steam flooding under different perforation conditions are conducted,and CO2-assisted steam flooding is proposed for reservoirs in the late stage of steam *** experimental results show that after adjusting the perforation in late steam flooding,the CO2 assisted steam flooding formed a lateral expansion of the steam chamber in the middle and lower parts of the injection well and a development mode for the production of overriding gravity oil drainage in the top chamber of the production well;high temperature water,oil,and CO2 formed stable low-viscosity quasi-single-phase emulsified fluid;and CO2 acted as a thermal insulation in the steam chamber at the top,reduced the steam partial pressure inside the steam chamber,and effectively improved the heat efficiency of injected *** on the three-dimensional physical experiments and the developed situation of the J6 block in Xinjiang Oilfield,the CO2 assisted steam flooding for the J6 block was *** application showed that the CO2 assisted steam flooding made the oil vapor ratio increase from 0.12 to 0.16 by 34.0%,the oil recovery increase from 16.1%to 21.5%,and the final oil recovery goes up to 66.5%compared to steam flooding after perforation adjustment.