Experimental Study of Oil Displacement and Gas Channeling during CO 2 Flooding in Ultra—Low Permeability Oil Reservoir

Feng Liu, Ping Yue, Qingli Wang, Gaoming Yu, Jiangtang Zhou, Xiukun Wang, Quantang Fang and Xinxin Li
Additional contact information
Feng Liu: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Ping Yue: State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu 610500, China
Qingli Wang: Changqing Oilfield Company, Petro China, Xi’an 710018, China
Gaoming Yu: Changqing Oilfield Company, Petro China, Xi’an 710018, China
Jiangtang Zhou: Changqing Oilfield Company, Petro China, Xi’an 710018, China
Xiukun Wang: Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing 102249, China
Quantang Fang: State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu 610500, China
Xinxin Li: Changqing Engineering Design Co., Ltd., Petro China, Xi’an 710018, China

Energies, 2022, vol. 15, issue 14, 1-13

Abstract: Aiming to solve the problems of poor CO 2 displacement efficiency and serious gas-channeling and low well-opening rates in ultra-low permeability reservoirs, we carry out CO 2 displacement experiments under different permeability reservoirs by using different development methods, water drive to gas drive procedures, and different fracture positions to clarify the effects of physical formation properties, injection methods, and fracture parameters on CO 2 displacement efficiency in C8 ultra-low permeability reservoirs. The experimental results show that the recovery degree of CO 2 miscible drive increases with an increase in permeability. When the gas–oil ratio is greater than 2000 m 3 /m 3 , serious gas channeling can be observed in both the miscible drive and immiscible drive. In addition, when the water drive is altered to be a gas drive, the water cut of 0.45 mD and 0.98 mD cores decreased, and the recovery degree increased by 13.4% and 16.57%, respectively. A long fracture length will deteriorate gas channeling and lower the CO 2 oil-displacement efficiency. However, the fracture location is found to have little impact on the recovery of CO 2 displacement.

Keywords: ultra-low permeability reservoir; CO 2 flooding; air water alternation; gas channeling; injected pore volume (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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