The Modeling Method Of The Penetrating Reservoir Thief Zone

After long-term water flooding,thief zone will lead to ineffecient water circulation,which is in the reservoirs development high water cut stage.In order to achieve the purpose of water control and oil stability,we have to effectively identify the thief zones and select the appropriate process measures to block the thief zones.Thus,how to use of limited reservoir data to more accurately identify and describe the position of thief zone is the key of the problem.At present,several identification and characterization methods of dominant channels have been developed,including tracer,well test data,water injection profile logging data,fuzzy identification,hydraulic detection,potential method,degree of cementation,size of pore throat,energy spectrum flow,etc.However,there are relatively few literatures on 3d modeling of Thief zones.This study on the method of reservoir seepage thief zones was selected by Badaowan formation reservoir in well K53 area of karamay oilfield as the research object and made comprehensive use of the reservoir geology theory and made use of all kinds of data in the process of geological research and developed the relevant knowledge of reservoir geological modeling.In recent years has gradually be summarized the thief zones identification technology,do some research about the thief zones’ modeling,but its identity in the selective advantage channel standard,In most cases,the general modeling method is used to establish multiple implementations of the Thief zones in the work area,to carry out statistical average,and the probability model of the Thief zones is mainly established with the parameter of absolute permeability.This method fails to consider that the Thief zones is a relative concept and cannot be identified with a single reservoir parameter.Moreover,although this method represents the uncertainty of the distribution of the Thief zones,it still meets the requirement of uncertainty.On the basis of previous studies,this study screened and identified the thief zones on the basis of a high-precision three-dimensional geological model constrained by earthquake and rock facies.In addition,the concept of heterogeneity for calculating range and penetration coefficient is added to the permeability,and the dominant channel is distinguished by the Angle of heterogeneity and permeability.Finally,the feasibility of the method is tested by the production performance data of oil field.The final results show that the modeling method for identification of thief zones has a good theoretical and practical significance for the closure of thief zones and residual oil exploration of high water-cut oil fields in the middle and later stage of domestic development,and can provide a theoretical basis for development decisions.