复合砂体内部建筑结构对聚驱的影响

INFLUENCES OF THE INTERNAL ARCHITECTURAL STRUCTURE OF THE COMPOSITE SANDBODY ON THE POLYMER FLOODING

聚驱过程常有少部分采油井虽位于大规模发育河道上,注采关系完善,注入方案也与其他井类似,但受效较差。为探究其原因,同时探索受效差油井进一步提高采收率方法,精细描述了受效差储层,研究了大面积发育河道砂内部微观建筑结构,对典型侧积体顶部的剩余油进行试验挖潜。结果表明,复合砂体内部建筑结构影响注入方向、波及体积及剩余油分布。研究成果对于指导聚驱过程调整及驱后剩余油挖潜具有重要借鉴意义。

In the process of polymer driving,it is often found that a few oil producing wells with perfect injectionproduction relationship and similar injecting schemes to the other wells in the large-scale channel obtain rather bad developed effects. In order to explore the cause and method of further enhancing the recovery of these wells and layers,the fine reservoir characterization was conducted,the internal microscopic structure of the large-scale developed channel was studied,the potential was tapped for the remained oil on the top of the typical lateral accretion body. The results confirm that the injected direction,swept volume,and remained oil distribution are influenced by the internal architectural structure of the composite sandbody. The achievements possess the important significances for the polymer flooding adjustment and the remained oil potential tapping after the polymer flooding.