Microscale Salt Tolerance and Profile Control of CO2 Foam in High-Salinity, Low-Permeability Reservoirs

doi:10.7657/XJPG20240609

Abstract

Abstract:

Regarding gas channeling during CO₂ flooding in high-salinity, low-permeability reservoirs, taking the H3 block of Changqing oilfield as an example, an enhanced CO₂ foam system with SiO₂ nano-particales was constructed to evaluate its salt tolerance with respect to foam rheology, gas-liquid interfacial tension, liquid film thickness and permeability, and foam microstructure. A parallel core displacement experiment was conducted for the foam system to assess its profile control performance. Based on the experimental results, a foam system of 0.20%(OW-1)+0.30%(OW-4)+0.05%(SiO₂) was developed under reservoir conditions, achieving a comprehensive index of 36,834 mL·min. The microscale salt tolerance evaluation indicates that, as compared with the foaming agents prepared at salinity of 46,357 mg/L and 500 mg/L, the developed foam system exhibits better rheological properties. The gas-liquid interfacial tension increased by only 1 mN/m at 10 MPa, and the liquid film permeability was improved by 0.14 cm/s. However, the foam system still maintains a robust skeletal structure. Thus, it is demonstrated with excellent salt tolerance at the microscale. Furthermore, for parallel cores with the permeability ratio of 15.55, the developed SiO₂ nanoparticle-enhanced CO₂ foam system improves the core profile by 97.28%, suggesting a remarkable enhancement in oil recovery, and demonstrating a good profile control performance.

Key words: high-salinity and low-permeability reservoir, Changqing oilfield, gas channeling, CO₂ foam, microscale, salt tolerance, profile control, enhanced oil recovery

CLC Number:

TE357

WEI Hongkun, WANG Jian, WANG Danling, LU Yuhao, ZHOU Yaqin, ZHAO Peng. Microscale Salt Tolerance and Profile Control of CO₂ Foam in High-Salinity, Low-Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(6): 703-710.

Figures/Tables 11

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岩心类型	长度/ cm	直径/ cm	孔隙体积/ cm³	孔隙度/ %	渗透率/ mD	渗透率级差
低渗透岩心	9.65	2.50	7.28	15.13	4.84	15.55
高渗透岩心	9.58	2.51	11.18	23.59	75.26	15.55

OW-1质量分数/%	OW-4质量分数/%	起泡体积/ mL	泡沫半衰期/ min	综合指数/ （mL·min）
0.10	0.10	250	29.5	5 531
0.10	0.20	260	15.0	2 925
0.10	0.30	510	20.6	7 880
0.10	0.40	540	33.4	13 527
0.10	0.50	590	37.8	16 727
0.20	0.10	280	36.9	7 749
0.20	0.20	350	30.4	7 980
0.20	0.30	560	54.7	22 974
0.20	0.40	600	42.5	19 125
0.30	0.10	290	24.8	5 394
0.30	0.20	320	29.7	7 128
0.30	0.30	600	57.1	25 695
0.40	0.10	270	23.8	4 820
0.40	0.20	300	19.3	4 343
0.50	0.10	300	27.6	6 210

Microscale Salt Tolerance and Profile Control of CO₂ Foam in High-Salinity, Low-Permeability Reservoirs

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