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research-article

The experimental study on the flooding regularities of various CO 2 flooding modes implemented on ultra-low permeability cores

[+] Author and Article Information
Aifen Li

School of Petroleum Engineering and research centre of multiphase flow in porous media, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong Province 266580, China266580, China
aifenli123@126.com

Xiaoxia Ren

School of Petroleum Engineering and research centre of multiphase flow in porous media, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong Province 266580, China266580, China
renxiaoxia1010@163.com

Shuaishi Fu

School of Petroleum Engineering and research centre of multiphase flow in porous media, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong Province 266580, China266580, China
floatingoliver@qq.com

Jiao Lv

School of Petroleum Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong Province 266580, China266580, China
164624296@qq.com

Xuguang Li

School of Petroleum Engineering, China University of Petroleum, No. 66, Changjiang West Road, Huangdao District, Qingdao, Shandong Province 266580, China266580, China
825822374@qq.com

Yuelong Liu

The North China Burear of Petroleum, SINOPEC, No.197, Funiu Road, Zhongyuan District, Zhengzhou, Henan Province 450000, China
94418.21@qq.com

Yulin Lu

The North China Burear of Petroleum, SINOPEC, No.197, Funiu Road, Zhongyuan District, Zhengzhou, Henan Province 450000, China
1960056578@qq.com

1Corresponding author.

ASME doi:10.1115/1.4039319 History: Received August 03, 2017; Revised December 07, 2017

Abstract

The application of water flooding is not successful for the development of low permeability reservoirs due to the fine pore sizes and the difficulty of water injection operation. CO2 can dissolve readily in crude oil and highly improve the mobility of crude oil, which makes CO2 flooding an effective way to the development of the ultra-low-permeability reservoirs. The regularities of various CO2 displacement methods were studied via experiments implemented on cores from Chang 8 Formation of Honghe Oilfield. The results show that: CO2 miscible displacement has the minimum displacement differential pressure and maximum oil recovery; CO2-alternating-Water miscible flooding has lower oil recovery, higher drive pressure and relatively lower gas-oil ratio; Water flooding has the minimum oil recovery and the maximum driving pressure. A large amount of oil still can be produced under a high gas-oil ratio condition through CO2 displacement method. This fact proves that the increase of gas-oil ratio is caused by the production of dissolved CO2 in oil rather than the free gas breakthrough. At the initial stage of CO2 injection, CO2 doesn't improve the oil recovery immediately. As the injection continues, the oil recovery can be improved rapidly. This phenomenon suggests that when CO2 displacement is performed at high water cut period, the water cut doesn't decrease immediately and will remain high for a period of time, then a rapid decline of water cut and increase of oil production can be observed.

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