【摘要】 带底油(油环)凝析气藏的数值模拟中,网格的划分对底油(油环)的描述起着很重要的作用。由于地层倾角的存在,常规的顺层网格经常会出现油气或油水界面在同一个网格内,甚至油气、油水界面在同一网格的情况,饱和度变化不连续,不能很好地描述油环油的分布;加密网格虽然在一定程度上减轻了这种现象,但是网格过多,影响数值模拟计算效率。本文针对底油(油环)的水平分布形态,建立了在气顶部分为顺层网格,底油(油环)和底水(边水)部分为水平网格的混合网格形式,很好地保证了底油(油环)的分布形态。同时,通过渗透率的转换,使水平网格部分的流体流动特性与地质上一致,有效地描述底水锥进薄油环以及油进入气藏的动态过程。通过对模型的模拟计算,验证了这种方法的可靠性。更多还原

【Abstract】 Grid distribution is the key parameter to describe the bottom oil(oil rim) in the simulation of condensate gas reservoir with oil rim and bottom water.The oilgas contact or water-oil contact,even the oil-gas contact and water-oil contact are usually in one single grid if the common Cartesian grid was used,which will cause the saturation distribute inconsistently and the description of oil distribution in the oil rim become changing;while the refined grid can alleviate this phenomenon,but the number of grid will affect the computation effect.This paper aimed at oil rim horizontal distribution,established a new hybrid grid type in which gas cap described with Cartesian grid while the oil rim and bottom water with horizontal grid.So,the description of oil rim distribution is guaranteed.Meanwhile,through transforming the permeability,the flow characteristics of fluid in the horizontal grids will keep consistent with geological fluid,therefore the dynamical process of bottom water breakthrough into thin oil rim and oil breakthrough into gas reservoir can be described very effectively.This method was validated through simulating a model.更多还原