Experimental Investigation of IOR Potential in Shale Oil Reservoirs by Surfactant and CO 2 Injection: A Case Study in the Lucaogou Formation

Yaoli Shi, Changfu Xu, Heng Wang (), Hongxian Liu (), Chunyu He, Jianhua Qin, Baocheng Wu, Yingyan Li and Zhaojie Song
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Yaoli Shi: Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Changfu Xu: Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Heng Wang: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Hongxian Liu: Department of Petroleum Engineering, China University of Petroleum-Beijing at Karamay, Karamay 834000, China
Chunyu He: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
Jianhua Qin: Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Baocheng Wu: Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Yingyan Li: Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Zhaojie Song: Unconventional Petroleum Research Institute, China University of Petroleum-Beijing, Beijing 102249, China

Energies, 2023, vol. 16, issue 24, 1-15

Abstract: The current oil recovery of the Lucaogou shale oil reservoir is predicted to be about 7.2%. It is crucial to explore improved oil recovery (IOR) technologies, and further experimental and field research needs to be conducted to study the complex mechanism. In this study, laboratory experiments were carried out to investigate the performance of one-step and multi-step depletion, CO 2 huff-n-puff, and surfactant imbibition based on nuclear magnetic resonance (NMR). The sweep efficiencies were assessed via NMR imaging. In addition, hybrid methods of combining surfactant with CO 2 huff-n-puff and the performance of injection sequence on oil recovery were investigated. The experimental results indicate that oil recoveries of depletion development at different initial pressures range from 4% to 11%. CO 2 huff-n-puff has the highest oil recovery (30.45% and 40.70%), followed by surfactant imbibition (24.24% and 20.89%). Pore size distribution is an important factor. After three more cycles of surfactant imbibition and CO 2 huff-n-puff, the oil recovery can be increased by 11.27% and 26.27%, respectively. Surfactant imbibition after CO 2 huff-n-puff shows a viable method. Our study can provide guidance and theoretical support for shale oil development in the Lucaogou shale oil reservoir.

Keywords: shale oil; IOR; CO 2 huff-n-puff; surfactant imbibition; NMR (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: 2023
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