Study On The Method Of The Spatial Locating Of Macroscopic Throats And The Potential Technology In HYJZ9-3 Oilfield

After a long waterflooding in a reservoir,it has gone to a stage of high degree of recovery and high water cut.There have been problems such as high water content and low utilization rate of water injection,and so on,which was caused by macroscopic throats formed in the reservoir.Therefore,the method of the identification and the spatial locating of macroscopic throats is of great importance.In this paper,the research of HYJZ9-3 oilfield is studied from the spatial locating of macroscopic throats,the fined reservoir numerical simulation and potential exploitation measures.First,this paper presents a practical technique to quantitatively locate macroscopic throats between injector/producer pairs in a reservoir,considering the problems of extensively developed macroscopic throats and the low sweep efficiency of waterflooding on high water cut stage.The method combines dynamic and static data,based on the results of geological research and the inversion of dynamic interwell connectivity.This technique has implemented the spatial locating of macroscopic throats,using the data of injection/production profiles and tracer test over the years,considering the sedimentary facies of each small layer and the permeability of each sand body.Then,based on the results of the spatial location of macroscopic throats and dynamic changes of seepage field,considering the variation of physical properties in the reservoir,according to the results of reservoir engineering methods and dynamic monitoring data.dynamic models of all stages has been builded.This technique has implemented dynamictracing fined reservoir numerical simulation in each historical period.Analysis of remaining oil distribution with the impact of macroscopic throats at present is used to divide several kinds of the distribution modes under the current development stage and provided different countermeasures for each mode.Finally,based on the distribution law of remaining oil,potential exploitation measures were designed.Development technologies of profile control and water shutoff,layer recombination optimization,water injection(production)optimization and polymer flooding have been made,and this paper forecasted and evaluate the schemes by numerical simulation.