A temperature and salinity resistant CO2 foam reinforced by regenerated cellulose and its anti-channeling Performance: Conformance control and geo-storage in low-permeability reservoirs
Yin X. Kang N. Kang W. Gabdullin M. Akhanova N. Aidarova S.
15 March 2026Elsevier Ltd
Fuel
2026#408
CO2 utilization and storage in unconventional reservoirs have shown immense potential for the dual benefits. CO2 foam provides an efficient technology for anti–gas channeling and CO2 geo-storage in low-permeability reservoirs. However, a critical challenge is the severe instability of conventional foams under harsh reservoir conditions of high temperature and salinity. In this work, a CO2 foam reinforced with a bio-resourced regenerated nanocellulose (RC) was introduced to enhance the foam stability under a specific low permeable oil reservoir condition. First, reinforced foam half-life was elongated by around 3–4.5 times, while drainage half-life extends by 5–10 times at 25–85°C under ambient pressure and 8 MPa contrast with sole surfactant foam. The dynamic stability was investigated by the apparent viscosity of foam under shearing, foam with RC not only exhibited better stability but also a re-generation during shearing. In the salinity range from 0–6 × 104 mg/L, foaming capacity and half-life of RC foam decreased slightly by 7 % and 20 %. The foam dynamics on microscopic scale showed that RC forms a “armor” for bubbles and inhibited both the gas diffusion between bubbles and foam coalescence. Core flooding experiments was investigated for the anti-gas channeling and geo-storage performance. The maximum resistance factor increased from 24.9 to 56.2 at 25°C, from 9.2 to 37.8 at 85°C with addition of RC in homogeneous sandpacks and increased from less than 5 (for surfactant-only foam) to over 138 at 25°C and 80.1 at 85°C in heterogeneous cores. Meanwhile, gas retained in the cores was also enhanced from 13.2 % to 57.1 % at 85°C with RC addition. This study showed significant role of RC on anti-channeling and CO2 storage under reservoir conditions in low permeable reservoirs.
CO2 foam , Foam stability , Geo-storage , Regenerated cellulose , Temperature and salinity resistant
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Kazakh-British Technical University, Tole Bi Street 59, Almaty, 050000, Kazakhstan
Petroleum Exploration and Production Research Institute, SINOPEC, No.197 Baisha Road, Beijing, 102206, China
Kazakh-British Technical University
Petroleum Exploration and Production Research Institute
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026