期刊
TRANSPORT IN POROUS MEDIA
卷 82, 期 1, 页码 111-122出版社
SPRINGER
DOI: 10.1007/s11242-009-9439-5
关键词
Residual gas trapping; Pore scale; X-ray CT; Capillarity; Stability; Capillary number
资金
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
- Ministry of Education, Culture, Sports and Technology in Japan [1810069]
- Grants-in-Aid for Scientific Research [21310053] Funding Source: KAKEN
We investigated the mechanism of residual gas trapping at a microscopic level. We imaged trapped air bubbles in a Berea sandstone chip after spontaneous imbibition at atmospheric pressure. The pore structure and trapped bubbles were observed by microfocused X-ray computed tomography. Distributions of trapped bubbles in Berea and Tako sandstone were imaged in coreflooding at a capillary number of 1.0 x 10(-6). Trapped bubbles are of two types, those occupying the center of the pore with a pore-scale size and others having a pore-network scale size. In low-porosity media such as sandstone, connected bubbles contribute greatly to trapped gas saturation. Effects of capillary number and injected water volume were investigated using a packed bed of glass beads 600 mu m in diameter, which had high porosity (38%). The trapped N-2 bubbles are stable against the water flow rate corresponding to a capillary number of 1.0 x 10(-4).
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