In:
Molecules, MDPI AG, Vol. 28, No. 1 ( 2022-12-26), p. 188-
Abstract:
Because of the growing demand for energy, oil extraction under complicated geological conditions is increasing. Herein, oil displacement by CO2 in wedge-shaped pores was investigated by molecular dynamics simulation. The results showed that, for both single and double wedge-shaped models, pore Ⅱ (pore size from 3 to 8 nm) exhibited a better CO2 flooding ability than pore Ⅰ (pore size from 8 to 3 nm). Compared with slit-shaped pores (3 and 8 nm), the overall oil displacement efficiency followed the sequence of 8 nm 〉 double pore Ⅱ 〉 single pore Ⅱ 〉 3 nm 〉 double pore Ⅰ 〉 single pore Ⅰ, which confirmed that the exits of the wedge-shaped pores had determinant effects on CO2 enhanced oil recovery over their entrances. “Oil/CO2 inter-pore migration” and “siphoning” phenomena occurred in wedge-shaped double pores by comparing the volumes of oil/CO2 and the center of mass. The results of the interaction and radial distribution function analyses indicate that the wide inlet and outlet had a larger CO2–oil contact surface, better phase miscibility, higher interaction, and faster displacement. These findings clarify the CO2 flooding mechanisms in wedge-shaped pores and provide a scientific basis for the practical applications of CO2 flooding.
Type of Medium:
Online Resource
ISSN:
1420-3049
DOI:
10.3390/molecules28010188
Language:
English
Publisher:
MDPI AG
Publication Date:
2022
detail.hit.zdb_id:
2008644-1
