A New Method for Adjusting Water Injection Rate in Multi-layer Heterogeneous Sandstone Reservoirs During Ultra-high Water Cut Period

Abstract

The present invention provides a new method for adjusting the water injection volume of multi-layer heterogeneous sandstone reservoirs during the ultra-high water-cut period, which is used to solve the inaccurate water injection adjustment scheme caused by the existing artificial empirical dynamic analysis-based adjustment method of water injection volume for layers The problem. Based on the quantitative evaluation of the production status of small layers, the present invention forms a layer water injection volume adjustment method that considers the remaining reserves of layers, relative water injection efficiency, water cut rising speed and reasonable injection-production ratio. The weight coefficient of each parameter is determined in stages, and the "four parameters" interval water injection volume adjustment model is established to realize the allocation and quantitative calculation of water injection well intervals. The new method for adjusting the water injection volume of the multi-layer heterogeneous sandstone reservoir during the ultra-high water-cut period can realize the allocation and quantitative calculation of the interval of the water injection well, and provides a new way for the optimal adjustment of the water injection during the ultra-high water-cut period.

Description

Technical field [0001] The present invention relates to the field of oil and gas field development, in particular to a new method for adjusting the amount of water injection in the layer segment of the ultra-high aquifer period of multi-layer heterogeneous sandstone reservoirs. Background [0002] Stratified water injection is an important means to alleviate the contradiction between layers and improve the utilization of oil reservoirs, and the rational allocation of water injection in each layer is crucial to the accurate development of oilfields. [0003] The determination of the amount of injection in the layer section is theoretically distributed according to the static parameters and the deployment of the well network, or only relies on the residual oil saturation obtained by the residual oil description technology to calculate the amount of the injection amount, but it is not applicable to the actual situation of the joint development of multiple oil layers in the producti...

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Problems solved by technology

[0005] The present invention aims to overcome the problem of inaccurate water injection adjustment scheme caused by the existing artificial empirical dynamic analysis-based adjustment method of layer water injection in the background technology, and provide a multi-layer heterogeneous sandstone reservoir with extra high water cut period A New Method for Adjusting the Water Injection Volume of Intervals

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