이산화탄소 격리저장시스템의 역학적 안정성 평가를 위한 주입온도 및 주입량 시나리오 해석
Scenario Analysis of Injection Temperature and Injection Rate for Assessing the Geomechanical Stability of CCS (Carbon Capture and Sequestration) System
2
조회
0
다운로드
4
인용
0
참고문헌
키워드
초록
향후 국내에서 수행될 이산화탄소 지중저장 프로젝트의 성공적인 수행을 위해서는 현장 지질조건에최적화된 주입 조건을 설계하는 것이 중요하다. 따라서 본 연구에서는 주입량 및 주입온도 등의 주입조건이격리저장시스템의 역학적 안정성에 미치는 영향을 열-수리-역학 연계해석기법의 하나인 TOUGH-FLAC 해석기법을 이용하여 평가하였다. 저장시스템의 역학적 안정성은 기존 균열의 전단미끄러짐 발생가능성을 활동마찰각및 응력원을 이용하여 분석하였다. 이산화탄소의 주입온도가 저류층의 초기온도보다 낮은 저온주입의 조건에도열응력으로 인한 인장균열은 발생하지 않는 것으로 파악되었으나, 저류층에서 전단미끄러짐이 발생하는 결과를보였다. 단위시간당 이산화탄소 주입량을 변화시킨 시나리오 해석에서는 단계별로 주입량을 감소시키는 주입시나리오에서 기존 균열들의 전단미끄러짐 발생 가능성이 가장 낮은 것으로 평가되었다.
Abstract
For a successful accomplishment of Carbon Capture Sequestration (CCS) projects, appropriate injection conditions should be designed and optimized for site specific geological conditions. In this study, we evaluated the effect of injection conditions such as injection temperature and injection rate on the geomechanical stability of CCS system in terms of TOUGH-FLAC simulator, which is one of the well-known T-H-M coupled analysis methods. The stability of the storage system was assessed by a shear slip potential of the pre-existing fractures both in a reservoir and caprock, expressed by mobilized friction angle and Mohr stress circle. We demonstrated that no tensile fracturing was induced even in the cold CO2 injection, where the injected CO2 temperature is much lower than that of the reservoir and tensile thermal stress is generated, but shear slip of the fractures in the reservoir may occur. We also conducted a scenario analysis by varying injected CO2 volume per unit time, and found out that it was when the injection rate was decreasing in a step-wise that showed the least potential of a shear slip.
참고문헌 (23)
- 강관구, "CO2 주입 온도 변화에 따른 주입정내 CO2의 거동변화 수치해석", 2014년도한국해양과학기술협의회 공동학술대회, pp.22~ (2014), 부산 BEXCO
- Park, M. H., "The Current Status of Study on CO2 Geological Storages in Korean Offshore Areas and KNOC‘s Demonstration Strategy", 2014 추계지질과학연합학술대회, pp.1~ (2014), 하이원컨벤션호텔
- Coleman, S. H., "The reservoir performance and impact from using large-volume, intermittent, anthropogenic CO2 for enhanced oil recovery", Master, pp.2012
- Fjær. E., "Petroleum Related Rock Mechanics", pp.491~ (2008), Elsevier
- Goodarzi. S., "Geomechanical modeling for CO2 storage in Nisku aquifer in Wabamun Lake area in Canada", International Journal of Greenhouse Gas Control, 10, pp.113~122 (2012)
- Gor, G.Y., "Effect of CO2 injection temperature on caprock stability", Energy Procedia, 37, pp.3727~3732 (2013)
- FLAC3D (Fast Lagrangian Analysis of Continua in 3 Dimensions) Version 5.0, "Itasca Consulting Group Inc.", ~ (2012)
- Kikuta, K, "Field test of CO2 injection in Nagaoka, Japan", Proceedings of the 7th Int. Conf. on greenhouse gas control technologies, pp.1367~1372 (2004)
- 김형목, "온실가스(CO2) 지중저장과 암반공학적 기술요소", 터널과 지하공간, 18(3), pp.175~184 (2008), 한국암반공학회
- 김형목, "CO2 지하저장과 연계한 원유회수증진 기술", 터널과 지하공간, 23(1), pp.1~12 (2013), 한국암반공학회
- Kim, S.H., "Geological CO2storage : Incorporation of pore-pressure", stress coupling and thermal effects to determine maximum sustainable pressure limit, 2014, pp.63, 3339~3346
- Kim, S.H., "Hydro-thermomechanical analysis during injection of cold fluid into a geologic formation", International Journal of Rock Mechanics and Mining Sciences, 77, pp.220~236 (2015)
- Kutchko, B. G., "Degradation of Well Cement by CO2 under Geologic Sequestration Conditions", Environmental Science Technology, 41, pp.4787~4792 (2007)
- Möller, F., "Injection of CO2at ambient temperature conditions – Pressure and temperature results of the “cold injection” experiment at the Ketzin pilot site", Energy Procedia, 63, pp.6289~6297 (2014)
- TOUGH2User’s guid, Ver. 2.0., "Pruess, K.", Lawrence Berkeley National Laboratory, ~, pp.Lawrence Berkeley National Laboratory Report LBL-43134 (1999)
- Rutqvist, J., "A study of caprock hydromechanical changes associated with CO2-injection into a brine formation", Environmental Geology, 42, pp.296~305 (2002)
- Rutqvist, J., "Coupled reservoir-geomechanical analysis of the potential for tensile and shear failure associated with CO2 injection in multilayered reservoir-caprock systems", International Journal of Rock Mechanics and Mining Sciences, 45, pp.132~143 (2008)
- Rutqvist, J., "Status of the TOUGH-FLAC simulator and recent applications related to coupled fluid flow and crustal deformations", Computes & Geosciences, 37, pp.739~750 (2011)
- Segall, P., "Induced Stresses due to Fluid Extraction from Axisymmetric Reservoirs", Pure and Applied Geophysics, 139(3, pp.4) (1992), 535~560
- Vilarrasa, V., "Liquid CO2 injection for geological storage in deep saline aquifers", International Journal of Greenhouse Gas Control, 14, pp.84~96 (2013)
- Vilarrasa, V., "Long term impacts of cold CO2 injection on the caprock integrity", International Journal of Greenhouse Gas Control, 24, pp.1~13 (2014)
- Wildgust, N., "Injection strategies for large-scale CO2 storage", 9th Annual Conference on Carbon Capture & Sequestration (2010)
- Yoon, J. S., "Simulation of hydraulic stimulation of fractured reservoir and induced seismicity using discrete element-fracture network model", Proceedings of 38th Workshop on geothermal reservoir engineering (2013), Stanford university