저류층 내 압력 강하에 따른 아스팔텐 퇴적 현상의 다성분 시뮬레이션

초록

Asphaltene existing as oil phase in initial reservoir condition can be precipitated by a number of factors including changes in pressure, temperature, and composition. Asphaltene precipitation, flocculation, and deposition in the reservoir cause serious formation damages such as porosity and permeability reduction and wettability alteration. In this study, asphaltene solid model is applied to predict the amount of asphaltene precipitation with pressure depletion. The compositional simulation for asphaltene precipitation, flocculation, deposition, and re-entrainment is performed to analyze its effects on formation damage causing reduced oil recovery. Production strategy for minimizing formation damage is designed by different oil flow velocity with different oil production rate. Oil relative permeability for deposited asphaltene removal model (Case 2) is higher up to 0.2 than base case (Case 1), and oil resistance factor is decreased by 20%. As a result, the enhancement of oil recovery for Case 2 is 1.4% over Case 1.

키워드