沥青沉积机理与模拟方法

MECHANISM AND MODELING TECHNIQUE OF ASPHTENE PRECIPITATION

在注气提高采收率过程中 ,沥青沉降经常严重妨碍了采收率的提高。因此 ,有必要研究沥青沉积的理论预测方法 ,帮助人们在设计注气与生产方案时 ,充分考虑这一因素的影响 ,以避免或减小它的危害。在前人对沥青沉降机理研究成果基础上 ,提出了用状态方程模拟沥青沉积的方法 ;并采用了三相闪蒸方程与考虑沥青沉积三相闪蒸数值算法。该方法不仅能对沥青沉积进行量化模拟 ,同时也能进行汽液固三相相平衡计算。

During IOR by gas injection, asphtene precipitation will commonly block the effect of IOR. In order to make the factor be taken into full consideration and to prevent from being loss when designing production and gas injection schemes, it is necessary to study the method for prediction of asphtene precipitation as to minimize or avoid the harm by the precipitation. On the bases of knowledge to asphtene precipitation, the paper presents technique for predicting asphtene precipitation through equation of state. Three phase flash equation and three phase flash algorithm which takes asphtene precipitation into account are used, which can not only simulate asphtene precipitation quantitatively, but calculate three phase equilibrium.