Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Numerical Analysis of Phase Behavior and Flow Properties in an Injection Tubing during Gas Phase CO2 Injection : Application of Demonstration-scale Offshore CO2 Storage Project in the Pohang Basin, Korea

기체상태의 CO2 주입시 주입관내 상변화 및 유동 특성의 수치해석적 연구 : 포항분지 해상 중소규모 CO2 지중저장 사업에 적용

  • Jung, Woodong (Petroleum and Mineral Research Institute, Hanyang University) ;
  • Sung, Wonmo (Dept. of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Han, Jeong-Min (KOGAS Research Institute, Korea Gas Corporation) ;
  • Song, Youngsoo (Dept. of Earth Resources and Environmental Engineering, Hanyang University) ;
  • Wang, Jihoon (Dept. of Earth Resources and Environmental Engineering, Hanyang University)
  • 정우동 (한양대학교 자원개발연구소) ;
  • 성원모 (한양대학교 자원환경공학과) ;
  • 한정민 (한국가스공사 가스연구원) ;
  • 송영수 (한양대학교 자원공학과) ;
  • 왕지훈 (한양대학교 자원환경공학과)
  • Received : 2021.04.15
  • Accepted : 2021.08.23
  • Published : 2021.08.31
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Abstract

CO2 storage technology in an aquifer is one of the most effective way to decrease global warming due to a high storage capacity and economics. A demonstration-scale offshore CO2 storage project was performed in a geological deep aquifer in the Pohang Basin, Korea for a technological development of large-scale CO2 storage. A challenging issue in the early design stage of the project was to establish the proper injectivity during CO2 injection. To solve this issue, injection conditions were calculated by calculating injection rate, pressure, temperature, CO2 phase change, and thermodynamic properties. For this study, we simulated and numerically analyzed CO2 phase change from gas to supercritical phase and flow behavior in transport piping and injection tubing using OLGA program. Our results provide the injectivity conditions of CO2 injection system combined with a bottomhole pressure of an aquifer.

대수층에 이산화탄소를 저장하는 기술은 높은 저장능력과 경제성 때문에 지구 온난화를 완화하는 가장 효율적인 방법중 하나이다. 포항분지 해상 중소규모 CO2 지중저장 실증은 심부 대수층에 CO2 를 저장하는 사업으로 대규모 CO2 저장에 필요한 실증요소 기술을 개발하고 검증하는데 목적이 있다. 이 사업의 초기 설계 단계에서 도전적으로 직면하는 문제중 하나는 CO2 를 주입하는 주입관에서 주입성을 확보하는 것이다. 이러한 문제를 해결하기 위해 주입량, 압력, 온도, CO2 의 상변화 및 그에 따른 열역학적인 물성값 등을 계산하여 주입 조건을 계산하였다. 본 연구를 위해 기체 상태의 CO2 를 주입관에 주입하여 기체-액체-초임계 상의 상변화 거동 및 유동 특성의 변화를 OLGA 프로그램을 이용하여 수치해석적으로 분석하였다. 결과를 통하여 CO2 의 주입 시스템과 대수층의 공저압을 연계하는 주입조건을 제시하였다.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 연구과제 해상 CO2지중저장 실증 프로젝트(20162010201980)로 부터 지원 받아 수행되었으며, 지원에 감사를 드립니다.

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