Fast identification method for secondary enrichment of residual oil in high water-content later period in complex fault block oil reservoir

Abstract

The invention provides a fast identification method for secondary enrichment of residual oil in high water-content later period in a complex fault block oil reservoir. The fast identification method comprises the steps that a target oil reservoir is measured to obtain geologic parameters and well network parameters of the target oil reservoir; according to the geologic parameters and the well network parameters of the target oil reservoir, a primary physical model of the target oil reservoir is established; based on the primary physical model of the target oil reservoir, fitting calculation is conducted according to a streamline stream tube method, dynamic fitting characteristics of an oil production well and a saturation field before secondary enrichment of the residual oil are obtained, and the primary physical model of the target reservoir is corrected to obtain a corrected physical model; and based on the corrected physical model, calculation of vertical enrichment and horizontal enrichment is conducted on joints in the enrichment process of the residual oil, the reservoir saturation and water content of the joints are obtained, and identification of secondary enrichment of the residual oil in high water-content later period in the target oil reservoir is achieved. The method can accurately predict the change condition of displacement leading edge dynamic parameters.

Description

technical field [0001] The invention relates to a rapid identification method for secondary enrichment of remaining oil in a complex fault-block oil reservoir in the late stage of high water cut, belonging to the field of complex fault-block oilfield development. Background technique [0002] Complex fault-block reservoirs have the geological characteristics of "small, scattered, poor, and fragmented". The development well pattern and reserve control degree are greatly affected by the plane distribution of the reservoir. Most fault blocks cannot form a complete injection-production well pattern . As a result, complex fault-block oil reservoirs generally have the problem of rapid water cut rise and low recovery. How to effectively improve the secondary enrichment and recovery of remaining oil after water flooding development is the key to improving water flooding development in complex fault-block oilfields. The key to the effect and enhance the ultimate recovery of the rese...

AI Technical Summary

Problems solved by technology

Therefore, the research on remaining oil enrichment in the late period of high water cut in conventional oil reservoirs cannot meet the needs of the actual development of complex fault-block reservoirs. In the actual application process, it cannot effectively perform rapid calculation of remaining oil secondary enrichment, and cannot accurately predict A series of issues such as changes in dynamic parameters of the displacement front

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