Study On The Residual Oil Distribution And Waterflooding Program After Polymer Flooding Of The Pu-1Reservoir In Daqing Oilfield

In view of the problem that water cut increased rapidly and oil rate declined quickly after polymer flooding in Daqing oilfield,the paper studies the residual oil distribution and waterflooding program of the Pu-1reservoir in Daqing Oilfield after polymer flooding, researchs cost-effective waterflooding technology after polymer flooding,provides a reference about residual oil exploitation for other water flooding blocks after polymer flooding.The paper firstly analysed the polymer flooding situation,the effect and the problems after polymer flooding,recognized that the producing degree of reservior been significantly improved by polymer flooding,produce the desired effect that the oil rate increase and the water cut decline,but at the same time,there are still a part of residual oil.Secondly,the paper studied the structural characteristics,reservior sedimentary characteristics,development status of oil layers and barrier beds,and provided basic congditions for study of the residual oil distribution.Thirdly,combine with tht coring, well logging and historical producting data,the paper studied the fine description about the residual oil distribution.From the longitudinal, the residual oil is mainly distributed in parts of the poor oil layers and the top of the thick oil layers.From the flat,because of the difference in oil reservior development in diferent area,the residual oil distribution does not follow a specific law, fragmented and complex. Lastly,combine with the actual development data,this paper set up fine geological model,studied the numerical simulation about waterflooding development program after polymer flooding by using the model, and preferred separate zone production program.Studies shows that separate zone production and injection/production pressure both rising after polymer flooding can enhance recovery.