Novel method for adjusting water injection rate of layer section in ultra-high water cut period of multi-layer heterogeneous sandstone reservoir

Abstract

The invention provides a novel method for adjusting the water injection rate of a layer section in an ultra-high water cut period of a multi-layer heterogeneous sandstone reservoir. The method is used for solving the problem that an existing layer section water injection rate adjusting method based on artificial experience dynamic analysis causes an inaccurate water injection adjusting scheme. According to the method, on the basis of quantitative evaluation of the small-layer working condition, the layer section water injection rate adjusting method considering the layer section residual reserve, the relative water injection efficiency, the water cut rising speed and the reasonable injection-production ratio is formed, an analytic hierarchy process is utilized, the weight coefficients of all parameters are determined in a graded mode according to the water injection efficiency, a four-parameter layer section water injection rate adjusting model is established, and quantitative calculation of injection allocation of the water injection well layer section is achieved. According to the novel method for adjusting the water injection rate of the layer section in the ultra-high water cut period of the multi-layer heterogeneous sandstone reservoir, quantitative calculation of injection allocation of the water injection well layer section can be achieved, and a new way is provided for optimal adjustment of water injection in the ultra-high water cut period.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a new method for adjusting the water injection volume of a multi-layer heterogeneous sandstone reservoir during an extra-high water-cut period. Background technique [0002] Layered water injection is an important means to alleviate the contradiction between layers and improve the production degree of oil layers. The reasonable distribution of water injection in each layer is crucial to the precise development of oilfields. [0003] Theoretically, the determination of interval injection volume is based on static parameters and well pattern deployment, or the calculation of injection volume is based on the remaining oil saturation obtained by the remaining oil description technology. The actual situation of the block such as dynamic parameter changes during high water cut periods is not applicable; the production site is mainly based on dynamic analysis and semi-quanti...

AI Technical Summary

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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