탄산염 균열 저류층의 비튜멘 개발을 위한 SAGD 기법 적용성 연구

Abstract

The resources of heavy oil in the carbonate reservoirs around the world are about 1.6 trillion barrels and the amount of bitumen at the Grosmont Formation in northern Alberta, Canada, is estimated to be about 406.5 billion barrels. However bitumen in the fractured carbonate reservoirs is frequently overlooked as a resource due to the problems and expenses involved in its production methods by injecting steam. It’s no doubt that there would be enormous effort on the development of bitumen in fractured carbonate reservoirs, which are potentially a enormous resource for future. It is considered that the current thermal processes like SAGD(Steam-Assisted Gravity Drainage) and CSS(Cyclic Steam Stimulation) would be utilized or modified in developing fractured bitumen carbonate reservoirs. This study generated the DP(Dual Porosity) model and DK(Dual Permeability) model to simulate the fracture characteristics and behavior of fluid in the fractured carbonate reservoirs. SAGD process was analysed in the fractured bitumen carbonate reservoir model and that resulted in signigicant difference in the DP and DK model. Grosmont Formation is known to consist mainly of bitumen-saturated matrix of 70% and fracture of 17.5%. In order to simulate vertical flow and voluntary bitumen production in the matrix system by steam injection, the DK model was selected. Sensitivity analysis of matrix permeability and fracture characteristics(such as fracture permeability and spacing) was performed in order to establish minimum criteria for commercial viability of SAGD process. The results suggest that SAGD may be viable in some of these fractured bitumen carbonate reservoirs.