Analysis Of Polymer Flooding Efficiency And Influencing Factors In Central And Western Of Xing 6 Area

Apricot six district in the Midwest polymer flooding block production development in 2011,after a blank water flooding stage has now entered the stage of polymer flooding after polymer injection,a phenomenon of low levels of pressure rising water cut recovery in the high,the serious influence apricot six development effect in central area.At first,this paper analyzed the six central district apricot a PI1-3 layers of the polymer injection geological characteristics of the study area to the bottom-up development of delta distributary plain and delta front deposition,the main development of distributary channel sand abandoned channel sand diversion He Jian untabulated reservoir sand body types such as the small layers inside channel sand area development,PI22-P13 development degree is better,better sand body connectivity,high water level,water cut more than 50%,the main distribution of remaining oil on plane near the fault and sand body becomes poor,longitudinal residual oil is mainly distributed in the top of the thick reservoirs.Analyzed the apricot six central area of polymer flooding development present situation,the injection pressure steady rise after polymer flooding in this area or rise is slow,part wellblock phenomenon such as water cut recovery faster,resulting in polymer flo oding development effect is poorer.The cause of low injection pressure is a underground injection-production balance hole cause the injection pressure is low,the second is reservoir sand body distribution.Distribution of interlayer insulation and big channel distribution heterogeneity caused by infusion of swept volume is limited.The causes of water cut rising fast mainly lies in the high degree of extraction.For the low liquid level.The injection parameters were adjusted by adjusting the molecular weight of the injected polymer,and the injection pressure was improved by the method of measuring and adjusting the injection and improving the residual oil in the oil layer.By adopting the above adjustment measures,the injection pressure of Xing 6 middle block was steadily improved,and the water recovery trend was effectively controlled.The results of the study have practical significance to improve the effect of cluster flooding in the six areas of apricot,and it also plays a guiding role in guiding the adjustment of other similar blocks.