• Title/Summary/Keyword: 유체공학

Search Result 2,688, Processing Time 0.029 seconds

Effect of Cyclic Injection on Migration and Trapping of Immiscible Fluids in Porous Media (공극 구조 내 교차 주입이 비혼성 유체의 포획 및 거동에 미치는 영향)

  • Ahn, Hyejin;Kim, Seon-ok;Lee, Minhee;Wang, Sookyun
    • Economic and Environmental Geology
    • /
    • v.52 no.1
    • /
    • pp.37-48
    • /
    • 2019

  • In geological $CO_2$ sequestration, the behavior of $CO_2$ within a reservoir can be characterized as two-phase flow in a porous media. For two phase flow, these processes include drainage, when a wetting fluid is displaced by a non-wetting fluid and imbibition, when a non-wetting fluid is displaced by a wetting fluid. In $CO_2$ sequestration, an understanding of drainage and imbibition processes and the resulting NW phase residual trapping are of critical importance to evaluate the impacts and efficiencies of these displacement process. This study aimed to observe migration and residual trapping of immiscible fluids in porous media via cyclic injection of drainage-imbibition. For this purpose, cyclic injection experiments by applying n-hexane and deionized water used as proxy fluid of $scCO_2$ and pore water were conducted in the two dimensional micromodel. The images from experiment were used to estimate the saturation and observed distribution of n-hexane and deionized water over the course drainage-imbibition cycles. Experimental results showed that n-hexane and deionized water are trapped by wettability, capillarity, dead end zone, entrapment and bypassing during $1^{st}$ drainage-imbibition cycle. Also, as cyclic injection proceeds, the flow path is simplified around the main flow path in the micromodel, and the saturation of injection fluid converges to remain constant. Experimental observation results can be used to predict the migration and distribution of $CO_2$ and pore water by reservoir environmental conditions and drainage-imbibition cycles.

  • https://doi.org/10.9719/EEG.2019.52.1.37 인용 PDF KSCI HTML