Remaining Oil Distribution And Techniques For Further Development After Polymer Flooding In Layer Pi

Polymerflooding is one of the most methods in thirdly recovery。Polymerflooding was put into practice in DaQing oilfield in 1995,due to polymer inreased the volumetric sweep efficiency,the EOR was greatly enhanced。But there is still almost 40~50% crude oil remained underground after polymer flooding。All of the sedimental units and different areas still remaining oil has yet to be tapped。Looking from the actual situation of expliting ,the residual oil is rather scattered after polymerflooding,depend on conventional injection adjustment can not achieve tapping purpose by injection adjustment。So water cut increasing changed faster,and the oilfield development economic benefits fall off considerably。Deepen understanding of the remaining oil distribution,and the potential tapping of residual oil is the most important project for further increase the development elements post-polymerflooding。Making the PI formations of Sabei area in Daqing Oil Field as the research object,making the best of laboratory experiment,the result of fine geological research,dynamic monitoring of reservoir and others kinds of static data and dynamic data,the article studied deeply distribution rule of the remaining oil and summarizes kinds of distributed types of remaining oils。According to the geological characteristics and distribution of bypassed oil,the article explored the feasibility of subdividing layers,injecting micro-organisms and nutrients and flooding of Nitrogen foam thermal, understood deeply to remaining oil distribution and potential seeking technique。The result can provide theoretical basis and practical experience for further exploring remaining oil after polymerflooding。...