현장 시료의 CO2/염수 상대유체투과도 거동 특성
Relative Permeability Characteristics for CO2 and Brine in In-situ Core Samples
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초록
성공적인 CO2 지중저장 사업을 위해 CO2/염수 상대유체투과도룰 이해하는 것은 매우 중요하다. 본 연구에 서는 호주 오트웨이 분지 paaratte 지층의 시료와 국내 대륙붕 고래 1-1공에서 채취한 시료를 대상으로 CO2/염수 상대 유체투과도를 측정하였다. 두 시료 모두 미세 입자 이동의 영향을 줄이기 위해 열처리를 수행하였고, paaratte 지층의 시료에서는 실제로 압력차가 2-3배 개선되는 결과를 보여주었다. CO2/염수 상대유체투과도 측정 결과, 두 시료 모두 0.2 이하의 낮은 CO2 끝점 상대유체투과도와 약 40% 이상의 높은 최소잔류수포화율이 관측된다. 이는 물/오일 시스 템과 상당히 대비되며, 고래 1-1공 시료의 최소잔류수포화율은 수습윤성으로 인해 paaratte 지층보다 높게 측정되었 기 때문에 CO2 주입양 산정 시, 보다 보수적으로 접근해야 한다. 이와 더불어 고래 1-1공 시료에서는 낮은 절대유체투 과도와 모세관 지배유동으로 인해 비효율적인 CO2 주입이 예상되므로 CO2 주입 유량을 높게 유지하는 것이 좋을 것 으로 판단된다.
Abstract
Understanding of the relative permeability for CO2/brine system is essential for the successful CO2 storage in geological formation. This paper presents experimental measurements of CO2/brine relative permeability in paaratte and Gorae 1-1 samples obtained from Australian Otway basin and Korea continental shelf, respectively. Both samples were fired to make flow efficient by reducing fine particle’s migration, which cause flow inefficiency by 2-3 times. The results show typical features of CO2/brine system with high irreducible brine saturation (over 40%) and low CO2’s end-point relative permeability (below 0.2). Furthermore, irreducible brine saturation of Gorae 1-1 sample is higher than that of the paaratte sample, due to difference in water-wet tendencies. It expects a more conservative approach in estimating the CO2’s injectable amount into the formation. And, by low absolute permeability and capillary dominant flow, injecting to the Gorae 1-1 formation with high flowrate is recommendable in actual operation.
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