Water Flooding Adjustment Method And Effectiveness Evaluat Research Of Xingnan Development Area

With the continuous development of oilfield,Xingnan development area has entered high water cut stage.Adjustion has severe difficulty;oil production level has the tendency of descent increasingly;between the water layers water cut is strong and the water quantity difference is strong also.So it is not accurate to only depend on experience to optimise the step of the oil wells and water wells?interval association of water wells and interval injection allocation amount.The adjustion only depending on experience is bad for the economic and effective development for the oilfield.So we need to unite pressure and water content to analysis layer segment once more,it is convenient for certaining the reasonable injection flow rate and the development index,and also guld water drive oilfield to develop economicly and effectivly.On the base of the geologic development information?the existing layer period division and the general using situation.The fuzzy mathematics was used to divide interval once more fot the existing illogical injection layers,and the effective thickness and the permeability contrast were pointed out considering of the pressure?water cut?recovery degree?bibulous profile?production fluid strength and other factors.Then on the basis of reasonable layer period of division,with water injection scheme adjustment as the breakthrough point,clearing water wells for each layer nature,namely the layer segment is should strengthen water injection,balance water injection,or control water injection.According to the nature of the layer segment,the water injection adjustion maesures and reasonable injection allocation amount were certained.In this part,we proceeded the scheme forecast for the research block mainly using numerical simulation.In view of the different layer section,the relationship between the injection-prodution struction adjustion and the average formation pressure of the injection wells were studied.At the last,the reasonable evaluation prediction model was set up,and we can evalute the economic efficiency measures with the model.The research methods and results in this article provided theory basis for guiding the high water cut period development area,and also provided a reference for adjustment of other oilfield development indexes.