A Method for Estimating Remaining Flowable Reserves

Abstract

The invention relates to a residual flowable reserve assessment method. The residual flowable reserve assessment method comprises the following steps that 1, the movable pure oil column heights of grids in a digital analog model at any time point are calculated according to oil saturation distribution in an existing digital analog model obtained after oil reservoir history matching; 2, reservoir stratum quality factors of the grids in the digital analog model at the same time point are calculated; 3, reservoir pressure factors of the grids in the digital analog model at the same time point are calculated and corrected; 4, according to the movable pure oil column heights, the , reservoir stratum quality factors and the reservoir pressure factors, residual flowable reserves of the grids in the digital analog model at the same time point are calculated; 5, according to the obtained residual flowable reserves of the grids in the digital analog model at the same time point, residual flowable reserves of all layers of an oil reservoir are calculated respectively, and the later residual flowable reserve in oil reservoir development is obtained. The residual flowable reserve assessment method is simple in principle, strong in operability and suitable for residual flowable reserve assessment of any type of oil reservoirs, and calculation results are objective.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to a method for evaluating remaining flowable reserves. Background technique [0002] Tapping the potential of remaining reserves is a key task in the middle and late stages of reservoir development. Scholars at home and abroad have achieved many research results, but the evaluation of remaining flowable reserves that comprehensively considers the three factors of movable oil column height, reservoir physical properties and pressure distribution has not yet been formed. method. Among them, the height of the movable oil column is a key parameter that truly reflects the flowable reserves in the reservoir. Considering the existence of residual oil saturation, a large residual oil saturation in the middle and late stages of reservoir development does not mean that the remaining reserves are large, and should be considered in the remaining reserves. The effect of residual oi...

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Problems solved by technology

[0003] However, the existing assessment of remaining flowable reserves is limited to using two parameters of remaining hydrocarbon volume and reservoir physical properties to evaluate remaining reserves; or using three parameters of remaining hydrocarbon volume, reservoir physical properties and pressure to evaluate remaining reserves, However, in the pressure characterization method, there will be a problem that the low-value area of ​​the remaining reserves becomes a high-value area, and the height of the remaining movable oil column is not represented, so the accuracy of the evaluation of the remaining flowable reserves is low

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