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Research Paper

Analysis of the Aquifer Models for the Simulation of CO2 Underground Storage

CO2 지중저장 시뮬레이션을 위한 대수층 모델 분석

Jaeyu Bae1
,
Euseok Seo1
,
Ilsik Jang2*
배 재유1
,
서 유석1
,
장 일식2*
1한국석유공사 CCS전담반
2조선대학교 에너지자원공학과
*Corresponding Author. 
31 December 2013. pp. 769-780
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Abstract

The grid system with theoretical or numerical aquifer models is required to save time and cost for CCS simulation. The results from the grid system with theoretical or numerical aquifer models were compared with the full grid system for large aquifer in terms of CO2 injection rate, pressure, and pressure-derivative profile. As a result, Carter-Tracy model presented the best performance, but the results was deviated slightly from those of the full grid system over time, which was attributed to the method for calculating the equivalent radius of the aquifer model based on the contacted area between the grid system and the aquifer model. This study suggested the correlation equation that modified input data for the aquifer model, which resulted in good matches of the results between the model with the Carter-Tracy aquifer and the full grid system. However, the grid system with an aquifer model should be large enough for CO2 plume not to reach the outer boundary of the system during the simulation time.

Keywords
CCS
CO2
Simulation
Aquifer model
Carter-Tracy

CO2 지중저장에 대한 시뮬레이션 수행 시 컴퓨터의 용량과 속도의 제한으로 인해 이론적 또는 수치적 대수층 모델을 사용한 격자시스템 구성이 필수적이다. 이 연구에서는 작은 규모의 격자시스템과 주요 대수층 모델을 사용하여 대규모 격자시스템의 시뮬레이션 결과와 비교하였다. 이론적 또는 수치적 대수층 모델의 결과를 CO2 주입량, 압력, 그리고 압력 도함수에 대해 비교한 결과 Carter-Tracy 모델이 대규모 격자모델과 가장 잘 일치하지만 시간이 지남에 따라 편차가 발생하는 것을 확인하였다. 이는 대수층 모델의 등가반경을 결정하는 기법에서 오는 오차로 이 문제를 해결할 수 있는 관계식을 제시하였다. 그 결과 Carter-Tracy 대수층을 사용한 모델과 대규모 격자모델의 결과가 잘 일치하는 것을 확인하였다. 그러나 이러한 대수층 모델을 사용할 때는 시뮬레이션 기간 동안 CO2 자유가스가 격자의 외부경계에 도달하지 않도록 격자규모를 충분히 크게 해야 한다.

키워드
CCS
CO2
시뮬레이션
대수층 모델
Carter-Tracy
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 50
  • No :6
  • Pages :769-780
  • Received Date : 2013-08-21
  • Revised Date : 2013-10-22
  • Accepted Date : 2013-12-12
  • DOI :https://doi.org/10.12972/ksmer.2013.50.6.769
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