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2026 Vol.42, Issue 2 Preview Page
Comparative Analysis of scCO2 Displacement Behavior under Alternating and Continuous Injection Strategies in a PDMS Micromodel

PDMS 마이크로모델을 활용한 주입 전략(교대 및 단순 주입)에 따른 scCO2 치환 거동 비교

Juyeong Lee1
,
Seokgu Gang2
,
Jooyong Lee3
,
Jongwon Jung4*
이 주영1
,
강 석구2
,
이 주용3
,
정 종원4*
1Member, MS Student, Dept. of Civil Engineering, Chungbuk National Univ.
2Member, Ph.D, Dept. of Civil Engineering, Chungbuk National Univ.
3Ph.D, Korea Institute of Geoscience and Mineral Resources, KIGAM
4Member, Prof., Dept. of Civil Engineering, Chungbuk National Univ.
1정회원, 충북대학교 토목공학과 석사과정
2정회원, 충북대학교 토목공학과 박사
3비회원, 한국지질자원 연구소 탄소저장연구센터 책임연구원
4정회원, 충북대학교 토목공학과 정교수
*Corresponding Author
30 April 2026. pp. 77-88
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Abstract

Injection efficiency and displacement behavior of supercritical carbon dioxide (scCO2) in geological carbon capture and storage (CCS) are governed by the interplay among injection strategy, flow rate, fluid composition, and pore structure. Most previous micromodel studies have operated under idealized continuous injection conditions, where surfactants are uniformly distributed throughout the pore space. However, in actual storage environments, surfactant solutions and scCO2 are typically injected sequentially under surfactant-alternating-gas (SAG) conditions. This study utilized a polydimethylsiloxane (PDMS)-based pore network micromodel to quantitatively compare scCO2 displacement behavior and injection efficiency under continuous injection and SAG strategies. Under continuous injection, efficiency consistently increased as the flow rate rose from 0.001 to 0.1 mL/min, with surfactants enhancing efficiency across all flow conditions. Notably, the Glucopon condition achieved a maximum efficiency of 90.53% at the highest flow rate (0.1 mL/min), indicating superior displacement performance. By contrast, under SAG conditions, injection efficiency varied between 59.44% and 90.53% depending on the pre-injection volume (PV) and flow rate, without a clear increasing trend. For sodium dodecyl benzene sulfonate (SDBS), efficiency increased by approximately 11.4% from 0.1 to 0.87 PV under low-flow conditions. However, at intermediate and high flow rates, peak efficiency (up to 87.05%) was achieved at 0.44 PV, followed by a decline. Glucopon showed a steady increase in efficiency from 74.87% to 90.53% at high flow rates but did not consistently outperform the continuous injection condition with uniformly distributed surfactant. Compared to continuous injection without surfactant, SAG improved injection efficiency by up to 20%. However, when compared to continuous injection under uniform surfactant conditions, SAG did not consistently provide an advantage.

Keywords
Carbon dioxide capture
Geological carbon storage
Injection strategy comparison
Supercritical CO2
,Surfactant-alternating-gas injection

지질학적 탄소 저장(CCS)에서 초임계 이산화탄소(scCO2)의 주입 효율과 치환 거동은 주입 전략, 유량, 유체 조성, 공극 구조의 상호작용에 의해 결정된다. 기존 마이크로모델 연구는 계면활성제가 사전 분포된 단순주입 조건을 주로 가정하였으나, 실제 저장 환경에서는 계면활성제 수용액과 scCO2가 순차적으로 주입되는 교대 주입(Surfactant-Alternating-Gas, SAG) 조건이 적용될 수 있다. 이에 본 연구는 Polydimethylsiloxane (PDMS) 기반 공극 네트워크 마이크로모델에서 단순주입(continuous injection)과 SAG 조건의 scCO2 치환 거동과 주입 효율을 정량 비교하였다. 단순주입에서는 주입 속도 0.001-0.1 mL/min 범위에서 효율이 지속적으로 증가하였으며, 계면활성제 적용 시 전 구간에서 추가 향상이 관찰되었다. 특히 Glucopon 600 CSUP 조건은 고유량(0.1 mL/min)에서 최대 90.53%의 효율로 가장 높은 치환 성능을 보였다. Sodium dodecylbenzenesulfonate(SDBS) 조건에서는 효율이 59.44-90.53% 범위에서 PV 및 유량에 따라 변동하였으나 증가 양상은 비일관적이었다. SDBS는 저유량에서 0.1 PV 대비 0.87 PV에서 약 11.4%p 증가하였으나, 중·고유량에서는 0.44 PV에서 최대 87.05%를 기록한 후 감소하였다. Glucopon은 고유량에서 74.87%에서 90.53%까지 증가했으나, 단순주입-계면활성제 조건을 일관되게 초과하지는 못하였다. 종합적으로 SAG는 비계면활성제 단순주입 대비 최대 20%p 이상 향상되었으나, 계면활성제가 균일 분포된 단순주입 조건에 대해서는 일관된 우위를 보이지 않았다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 42
  • No :2
  • Pages :77-88
  • Received Date : 2026-02-20
  • Revised Date : 2026-03-17
  • Accepted Date : 2026-03-22
  • DOI :https://doi.org/10.7843/kgs.2026.42.2.77
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