【摘要】 微观驱油试验表明,交联聚合物驱后剩余油进一步减少,主要以斑块状、小油滴状等形态分布于微孔隙中;数值模拟显示,下二门油田H2Ⅲ油组交联聚合物驱后80.8%的面积已为中强水淹,纵向上79.7%的剩余油分布于主力油层。受构造、储层物性及井网因素控制,未淹、弱水淹剩余油平面上主要分布在断层附近、断层破碎带、微构造高点和砂体上倾尖灭区等部位;纵向上主要分布于低渗透层段。针对剩余油分布特征,通过完善注采关系、优化注采结构,单元含水量的上升速度和产量递减幅度得到控制,采收率在交联聚合物驱的基础上进一步提高了2.01%。更多还原

【Abstract】 Microcosmic experiments show that remained oil is distributed in tiny pore as speckles and tiny drops after cross-linked polymer flooding.On the other hand,reservoir simulation shows that 80.8% remained oil is distributed on the flooded area and 79.7% in the main production layer in H2Ⅲ series of strata.Controlled by structure,facies and well pattern,high oil saturation is found near faults,the top of micro-structures,upper zones where sandstone edges away and the low permeability section.According to oil remaining distribution,the methods on optimizing injection water proportion and improving well pattern are applied in H2Ⅲ series of strata.This optimization decreases water rate and increases oil production of H2Ⅲ series of strata and improves the recovery by 2.01%.更多还原