Micro-Displacement and Storage Mechanism of CO 2 in Tight Sandstone Reservoirs Based on CT Scanning

Ping Yue, Feng Liu (), Kai Yang, Chunshuo Han, Chao Ren, Jiangtang Zhou, Xiukun Wang, Quantang Fang, Xinxin Li and Liangbin Dou
Additional contact information
Ping Yue: State Key Laboratory of Reservoir Geology and Development, Southwest Petroleum University, Chengdu 610500, China
Feng Liu: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Kai Yang: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Chunshuo Han: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Chao Ren: 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
Liangbin Dou: School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China

Energies, 2022, vol. 15, issue 17, 1-16

Abstract: Tight sandstone reservoirs are ideal locations for CO 2 storage. To evaluate the oil displacement efficiency and storage potential of CO 2 in the tight sandstone reservoir in the Huang 3 area of the Changqing Oilfield, four kinds of displacement experiments were conducted on core samples from the Chang 8 Formation in the Huang 3 area. These experiments were performed using micro-displacement equipment, digital core technology, and an online CT scanning system; the different oil displacement processes were recorded as three-dimensional images. The results show that the CO 2 flooding alternated with water scheme can improve crude oil recovery the most. Comparing the cores before and after the displacement shows that the amount of crude oil in pores with larger sizes decreases more. The remaining oil is mainly in thin films or is dispersed and star-shaped, indicating that the crude oil in the medium and large pores is swept and recovered. The CO 2 displacement efficiency is 41.67~55.08%, and the CO 2 storage rate is 38.16~46.89%. The proportion of remaining oil in the throat of the small and medium-sized pores is still high, which is the key to oil recovery in the later stages.

Keywords: CO 2 flooding; CO 2 -enhanced oil recovery; CO 2 storage; extra-low permeability sand reservoir; CT scanning; remaining oil distribution (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 references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/17/6201/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/17/6201/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2022:i:17:p:6201-:d:898077

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().