Dynamic Identification Method Of Preponderance Flow Path

After a long period of water injection,the reservoir in the continental sandstone reservoir becomes more and more heterogeneous,because it is washed by injected water,soaked,and so on.As a result,the area with relatively high permeability in the reservoir develops to form a preponderance flow path with low water injection efficiency and invalid circulation.The development of this kind of path will seriously affect the oilfield development benefit in the high water-cut oil field under the background of the low oil price era.In this paper,the formation mechanism of preponderance flow path is analyzed,and the dynamic identification criteria for the formation of preponderance flow path are determined by orthogonal test.In this paper,a method for quickly identifying preponderance flow path from injection and production analysis of oil and water wells is established,which is based on the optimization of "multivariate regression method"and "capacitive model method" in the plane.Considering the "water injection delay effect",the direction of the preponderance flow path can be judged quickly,and the"injection and production splitting method" is optimized in the longitudinal direction.A new type of water drive curve for high water cut is established.Based on this water drive curve,the relative permeability curve of high water cut period can be calculated,and the oil well production at high water cut is split.Finally,the method established in this paper can be used to identify and classify the preponderance flow path.Therefore,it is suggested that the oil field should carry out targeted measures to reduce the cost of water injection,thereby increasing the economic benefits of the water-flooding oilfield in the period of high water cut.