A New Quantitative Inversion Method for Reservoir Interwell Dynamic Connectivity at Extra High Water Cut Stage

The reservoir interwell water flooding status and oil-water movement direction at extra high water cut stage are complex, and inefficient and ineffective circling are becoming increasingly serious. The strengthening inference of reservoir interwell dynamic connectivity has been an important part of reservoir evaluation and dynamic analysis. According to the system analysis method, a weighted grey correlation model based on optimized entropy is proposed, and the inversion decision model for characterizing interwell dynamic connectivity of injection-production system is established, and reservoir interwell dynamic connectivity is inversed quantitatively with injection-production dynamic data. The interwell dynamic connectivity in the G20-39 district of Daqing LaSaXing oil field is inversed by using the established model; the interwell dynamic connectivity map is drawn. By adjusting the measure schemes for oil and water wells, a better development effect can be obtained, which verifies the validity of the presented method. The practice shows that this method has strong adaptability and accurate inversion result, the interwell dynamic connectivity inversed by this method is accord with the actual situation of reservoir, and can provide the foundation for the implementation of development adjustment measure of LaSaXing oilfield at extra high water cut stage.