Study on optimal combination of stratified water injection in extra high water cut period

Abstract

After several decades of mining, the block has entered the development stage of ultra-high water cut. Although the encryption adjustment and subdivision adjustment for different mining objects have been completed, the interlayer interference is still serious and invalid cycle still exists, making it difficult to develop and adjust. The subdivision adjustment of water injection well can further improve the production degree of various oil layers, effectively improve the utilization rate of water injection, and realize the adjustment of water injection well profile and water injection structure, which is one of the measures with low investment that can effectively improve the development effect of water flooding. To satisfy the needs of the reservoir, fine reservoir, operation based on the production dynamic data and based on the analysis of monitoring data, the application of multidisciplinary reservoir description technology, quantitative analysis of thin layered segment permeability variation coefficient, monolayer onrush of small layer in the paragraph number, interval number, sandstone thickness influence on subdivision adjustment effect, analysis of well test cycle and operation costs influence on economic benefits, A series of combination parameters of subdivision water injection interval are obtained, which can guide the subdivision water injection program, effectively alleviate the range of production decline and water cut rise, and provide technical support for fine tapping potential of water flooding in ultra-high water cut period.