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Effects of geochemistry and interphase transport of CO2 on hybrid carbonated low salinity waterflood to improve oil recovery and CO2 sequestration

Title
Effects of geochemistry and interphase transport of CO2 on hybrid carbonated low salinity waterflood to improve oil recovery and CO2 sequestration
Author
이근상
Keywords
carbonated waterflood; low salinity waterflood; geochemical reaction; interphase transport of CO2; wettability modification; enhanced oil recovery; CO2 storage
Issue Date
2019-08
Publisher
WILEY PERIODICALS
Citation
GREENHOUSE GASES-SCIENCE AND TECHNOLOGY, v. 9, no. 4, Page. 770-788
Abstract
The hybrid process of carbonated low salinity waterflood (CLSWF) integrating low salinity waterflood (LSWF) and carbonated waterflood (CWF) is proposed as enhanced oil recovery (EOR) incorporating CO2 storage. Based on the understanding of the mechanisms of LSWF and CWF, the hybrid technology is simulated with a fully-coupled model of fluid flow, geochemical reactions, and equation of state, which describes chemical interactions in the oil/brine/rock system. The comprehensive simulations confirm the synergetic effects of the hybrid CLSWF when compared to waterflooding (WF) and LSWF. In addition, optimum designs of cost-efficient CLSWF securing CO2 storage are drawn via optimization and sensitivity studies. First, CLSWF enhances wettability modification effect, when compared to LSWF. In CLSWF, extensive mineral dissolution causes more cation exchange. Following the multicomponent ion exchange theory of the wettability modification mechanism, CLSWF produces more residual oil than LSWF with an increasing equivalent fraction of cation. Consequently, it enhances oil recovery by 6.9% and 2.5%, compared with WF and LSWF. Second, the interphase transport of CO2 introduces the oil viscosity reduction effect, which improves the injectivity of CLSWF. Lastly, it sequestrates 25% of the injected CO2 in the depleted reservoir via the solubility-trapping mechanism. In optimization and sensitivity studies, the optimum design of CLSWF is determined to produce more oil recovery by 9.9% and more net present value by 35% over WF. In addition, 33% of the injected CO2 becomes sequestrated in the reservoirs. This study clarifies that hybrid CLSWF improves EOR, injectivity, and CO2 storage. (c) 2019 Society of Chemical Industry and John Wiley Sons, Ltd.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/ghg.1895https://repository.hanyang.ac.kr/handle/20.500.11754/153647
ISSN
2152-3878
DOI
10.1002/ghg.1895
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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