大庆油田北一二排西部二类油层宽分子量分布聚合物驱油效果研究

大庆油田萨中开发区北一二排西部上返二类油层聚合物驱区块为一套陆相河流-三角洲碎屑岩沉积,由于二类油层渗透率、孔喉半径、有效厚度分布相对于主力油层均匀,适宜采用分子量分布宽度指数较大的中分子量聚合物驱油,可提高聚合物驱油效果。经室内岩心模拟实验,采用分子量分布宽度指数为23的中分子量聚合物进行二类油层聚合物驱油,相对普通中分子量聚合物可以多提高采收率1．2个百分点。

Research on II type reservoir wide molecular weight distributed polymeric compound oil driving effect in the west of northern one two line of Daqing oilfield

Ⅱtype reservoir distributed polymeric compound in the west of northern one two line of Daqing oilfield Sazhong developing area is set of continental fades river -delta clastic rock deposition. Comparing major reservoir, there is rather uniform permeability, pore throat radius and effective thickness inⅡtype reservoir. Therefore it's more applicable to adopt middle molecular weight polymeric compound with large width index in molecular distribution for oil driving, which can improve polymeric compound oil driving effect Laboratory core simulated experiment testified that it can enhance 1. 2% collection rate comparing ordinary middle molecular weight polymeric compound by adopting middle molecular weight polymeric compound with 23 width index in molecular distribution forⅡtype reservoir polymeric compound oil driving.