Experimental Study on Oil Displacement Efficiency by Different Fluids in Low-Permeability Sandstone Reservoirs

doi:10.7657/XJPG20250113

Abstract

Abstract:

In the middle-late stage of waterflood development in low-permeability sandstone reservoirs in the eastern margin of the Junggar Basin, the development performance deteriorates, and the water cut increases, necessitating new effective development techniques. Different fluids were selected for oil displacement efficiency experiments. Using long cores and under simulated formation conditions, oil displacement experiments were performed for waterflooding and gas flooding with N?, CH?, and CO? after waterflooding till achieving the current recovery efficiency of the reservoir. Nuclear magnetic resonance scanning and oil-containing pore size inversion were conducted on cores before and after injection of different fluids. The results show that CO? flooding can increase the recovery factor by 21.58%. The fluids rank as CO?, CH?, H?O, and N? in a descending order of oil displacement efficiency and producing degree. N? flooding primarily recovers oil from larger pores, with the lower limit of pore size being 170.9 nm. CH? flooding primarily mobilizes oil from medium to large pores, with the lower limit of pore size being 48.7 nm. CO? flooding can extract oil from pores of all sizes, with the lower limit of pore size being 27.8 nm, the lowest level among the processes tested. A CO? flooding pilot test zone was established in the oilfield. After CO? injection, the liquid production increased, the water cut decreased, and the oil production improved, suggesting good field application.

Key words: low-permeability sandstone reservoir, water flooding, gas flooding, CO₂ flooding, oil displacement efficiency, recovery percent improvement

CLC Number:

TE357

CHEN Chao, YAN Xiaolong, LUO Xiaojing, ZHEN Yanming. Experimental Study on Oil Displacement Efficiency by Different Fluids in Low-Permeability Sandstone Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(1): 105-113.

Figures/Tables 11

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Table 2.

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岩心编号	长度/cm	直径/cm	孔隙度/%	渗透率/mD
N1	5.0	2.5	16.14	2.33
N2	7.6	2.5	11.41	1.98
N3	6.4	2.5	12.98	13.86
N4	3.8	2.5	14.37	12.50
C1	4.8	2.5	17.35	1.82
C2	6.0	2.5	9.56	2.13
C3	6.0	2.5	10.95	4.97
C4	5.7	2.5	14.14	5.17
H1	4.9	2.5	12.41	2.38
H2	4.6	2.5	12.59	1.76
H3	5.2	2.5	6.96	1.71
H4	7.0	2.5	11.93	10.13
W1	4.1	2.5	6.68	1.25
W2	7.8	2.5	4.96	3.81
W3	5.3	2.5	6.98	2.42
W4	3.7	2.5	18.17	11.35

井名	注气前				注气后				特征
井名	日产液量/t	日产油量/t	含水率/%	地层压力/MPa	日产液量/t	日产油量/t	含水率/%	地层压力/MPa	特征
HXX82井	9.8	0.3	97		10.9	0.5	87		日产液量上升，含水率下降
HXX60井	25.0	1.8	93		33.8	3.8	67		日产液量上升，含水率下降
HXX14井	10.4	0.6	95		14.7	0.9	82		日产液量上升，含水率下降
HXX16井	3.5	0.4	88	10.35	5.6	0.7	68	10.45	日产液量上升，含水率下降
HXX18井	12.9	0.6	95		11.6	1.0	91		含水率下降，日产油量上升
HXX21井	2.3	0.5	79	8.05	4.6	0.6	77	8.12	日产液量上升
HXX92井	4.5	1.0	77	7.23	5.9	1.3	60	8.94	日产液量上升
HXX80井	6.0	1.0	83		8.2	1.3	77	9.56	日产液量上升
HXX07井	14.9	1.9	86		24.1	2.3	85		日产液量上升
HXX12井	6.5	0.8	88		9.5	0.9	84		日产液量上升
HXX74井	6.3	1.0	86		4.2	0.7	76	13.58	未见效