Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Study of Kaolin Particle Migration and Clogging Using a Micromodel

마이크로 모델을 이용한 고령토 입자의 유동 특성 연구

  • Ha, Minkyu (School of Civil Engrg., Chungbuk National Univ.) ;
  • Jung, Jongwon (School of Civil Engrg., Chungbuk National Univ.)
  • 하민규 (충북대학교 토목공학부) ;
  • 정종원 (충북대학교 토목공학부)
  • Received : 2019.03.07
  • Accepted : 2019.04.24
  • Published : 2019.04.30
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Abstract

Hydrate dissociation is required to produce methane, which generates both water and methane. Thus, multiphase fluid flow and desalination are expected during methane production, which causes the fine migration and clogging in pores. The goal of this study is to explore the effects of both multiphase fluid flow and desalination on the migration and clogging of kaolin particles as typical fines. The results are as follows : (1) the larger the pore size is, the more mounting the critical clogging concentration is, (2) kaolin particles are more easily clustering and clogging in deionized water than salty water, and (3) the critical clogging concentration of kaolin in multiphase fluid flow is lower than in singlephase fluid flow. Therefore, clustering and clogging of kaolin within pore occur easily due to desalination and multiphase fluid flow when methane is produced from hydrates, and the efficiency of methane production is expected to decrease due to the degradation of permeability coefficient.

메탄을 생산하기 위한 하이드레이트 해리시 물과 메탄이 동시에 발생한다. 따라서, 지반 내 이온수의 담수화 및 다상유체의 흐름이 예상되고, 흙입자의 이동 및 막힘에 영향을 주게 된다. 본 연구는 담수화 및 다상유체 흐름이 대표적 세립토인 고령토 입자의 이동 및 막힘에 어떻게 영향을 주는지 규명하고자 한다. 연구 결과는 다음과 같다. (1) 공극의 크기가 커질수록 최소 막힘 발생 농도가 증가한다. (2) 고령토 입자는 소금물보다 담수에서 쉽게 뭉침 및 공극 막힘이 발생한다. (3) 다상유체 흐름 내에서 고령토의 최소 막힘 발생 농도는 단상유체 흐름에 비해 감소한다. 따라서, 하이드레이트로부터 메탄 생산 시, 담수화 및 다상유체의 흐름 발생으로 인해 고령토의 공극 막힘이 쉽게 발생할 수 있고, 이로 인해 투수계수의 저하로 메탄 생산효율의 저하가 예상됨을 설명하였다.

Keywords

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Fig. 1. Affecting parameters on fines migrating and clogging during a singlephase fluid flow (Cao et al., 2019)

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Fig. 2. Experimental setup (Cao et al., 2019)

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Fig. 3. Effects of pore throat size ratio on clogging

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Fig. 4. Effects of pore fluid salinity on clogging

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Fig. 5. Effects of pore fluid salinity on critical clogging concentration

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Fig. 6. Effects of multi-phase fluids flow on clogging

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Fig. 7. Effects of multi-phase fluids flow on critical clogging concentration

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