셰일저류층 흡탈착 특성을 고려한 이산화탄소 저장-회수증진 시뮬레이션 연구
Simulation of CO2 Storage and Enhanced Gas Recovery in Shale Gas Reservoirs Considering Adsorption Characteristics
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초록
이 연구에서는 셰일저류층을 대상으로 이산화탄소 주입에 따른 저장-회수증진 복합거동 특성을분석하였다. 실제 셰일저류층 자료를 기반으로 개념모델을 구축하였으며, 이산화탄소 주입에 따른 저장 및 회수증진에 큰 영향을 미칠 것으로 예상되는 흡탈착 특성에 따른 시뮬레이션 결과를 비교하였다. 단순 감압에 의한 생산량은 흡탈착 특성에 직접적인 영향을 받으며, 이산화탄소 주입의경우 생산량 및 저장량은 메탄 및 이산화탄소의 흡탈착 특성이 복합적으로 작용하여 큰 차이를 보이지 않지만, 흡착 용량과의 상관성을 관측할 수 있었다. 저장효율 측면에서는 80% 이상의 셰일저류층 대상 이산화탄소 처분이 가능할 것으로 판단되나, 회수증진 관점에서는 흡탈착 특성에 의한영향이 미약하기 때문에 추가적인 저류층 물성과의 연계 및 다양한 주입 공법 적용 등을 동시에 고려한 운영 최적화 분석이 필요할 것으로 판단된다.
Abstract
In this study, we examined the performance of CO2 injection techniques based on simulations in a conceptual shale reservoir to investigate the efficiency of CO2 storage and enhanced gas recovery (CS-EGR). The developed conceptual model considers major shale reservoir characteristics in which the adsorption properties are the focus as a control parameter. For simple depletion cases, the production performance was directly dependent on the adsorption properties. However, in the CO2 injection cases, the adsorption and desorption processes are more complicated and we did not identify remarkable increases in the recovery factor, but we observed a weak relationship with the Langmuir volume. The results of all CO2 injection cases showed that the storage efficiency was more than 80%, indicating that shale reservoirs are a promising target for CO2 storage. To increase the recovery factor and improve the optimum control of CS-EGR, other major shale reservoir properties and operational parameters should be simultaneously integrated.
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