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Micro-PIV measurements of multiphase flow of water and liquid CO2 in 2-D heterogeneous porous micromodels

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1002/2017WR020850· OSTI ID:1470199
 [1];  [1];  [1];  [2]
  1. Univ. of Notre Dame, IN (United States). Dept. of Aerospace and Mechanical Engineering; Kyushu Univ. (Japan). 2CO2 Storage Division, International Inst. for Carbon-Neutral Energy Research (I2CNER)
  2. Univ. of Notre Dame, IN (United States). Dept. of Aerospace and Mechanical Engineering, Dept. of Civil and Environmental Engineering, and Earth Sciences Division; Kyushu Univ. (Japan). 2CO2 Storage Division, International Inst. for Carbon-Neutral Energy Research (I2CNER)
We present an experimental study of pore-scale flow dynamics of liquid CO2 and water in a two-dimensional heterogeneous porous micromodel, inspired by the structure of a reservoir rock, at reservoir-relevant conditions (80 bar, 21°C). The entire process of CO2 infiltration into a water-saturated micromodel was captured using fluorescence microscopy and the micro-PIV method, which together reveal complex fluid displacement patterns and abrupt changes in velocity. The CO2 front migrated through the resident water in an intermittent manner, forming dendritic structures, termed fingers, in directions along, normal to, and even opposing the bulk pressure gradient. Such characteristics indicate the dominance of capillary fingering through the micromodel. Velocity burst events, termed Haines jumps, were also captured in the heterogeneous micromodel, during which the local Reynolds number was estimated to be ~21 in the CO2 phase, exceeding the range of validity of Darcy's law. Furthermore, these drainage events were observed to be cooperative (i.e., across multiple pores simultaneously), with the zone of influence of such events extending beyond tens of pores, confirming, in a quantitative manner, that Haines jumps are nonlocal phenomena. After CO2 completely breaks through the porous section, shear-induced circulations caused by flowing CO2 were also observed, in agreement with previous studies using a homogeneous porous micromodel. To our knowledge, this study is the first quantitative measurement that incorporates both reservoir-relevant conditions and rock-inspired heterogeneity, and thus will be useful for pore-scale model development and validation.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Geologic Storage of CO2 (GSCO2)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012504
OSTI ID:
1470199
Alternate ID(s):
OSTI ID: 1375528
Journal Information:
Water Resources Research, Journal Name: Water Resources Research Journal Issue: 7 Vol. 53; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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