Open AccessEffect of Injection Pressure on CO2 Huff-n-Puff in Low-Permeability Sandstone Cores Using Nuclear Magnetic Resonance
Author(s) -
Deyu Wang,
Yingjun Ju,
Songlin Feng,
Shi-Dong Chen,
Wen Wei,
Jinghang Ma,
Tong Zhang,
Jinsheng Zhao
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/696/1/012032
Subject(s) - permeability (electromagnetism) , macropore , geology , degree (music) , enhanced oil recovery , materials science , mineralogy , petroleum engineering , chemistry , mesoporous material , biochemistry , physics , membrane , acoustics , catalysis
In order to figure out the micro-scale recovery degree of different pore sizes, the T 2 spectrum of low-permeability sandstone cores before and after CO2 huff-n-puff is obtained using NMR technique. The results show that the micro-scale recovery degree increases with increase of pore sizes. Oil in macropores and medium pores is more easily produced, and Oil in micropores is difficult to recover at 7-12MPa. The total recovery degree of three cores increases with the increase of injection pressure. This study is expected to be significant for understanding the mechanisms of CO2 huff-n-puff for enhancing oil recovery in low-permeability sandstone reservoirs.