关键词: 薄互层, 层间干扰, 流动能力, 层系组合, 射孔优化

Abstract: Thin interbedded sandstone reservoir is disadvantaged by complicated conditions, various main controlling factors of interstratigraphic disturbances, and difficult prediction of interstratigraphic disturbance law, exerting great impact on the overall development efficiency of the oilfield. To address this problem, based on the mechanism of interlayer interference in thin interbedded sandstone reservoirs, the main controlling factors of interlayer interference in thin interbedded sandstone reservoirs were clarified by reservoir engineering methods. According to the dynamic analysis of actual oilfield production, the dynamic and static flow capacities of the sub-bed was quantitatively evaluated, a quantitative prediction chart was prepared for interlayer interference throughout the whole life under the joint action of physical properties, fluid properties, injection and production effects, water logging and other factors of the sub-bed, and targeted countermeasures for bed series adjustment were proposed. It was found in the study that, the interstratigraphic disturbances in thin interbedded sandstone reservoirs exhibited different dynamic patterns under different flow capacities, and the effects of dynamic and static factors should considered comprehensively; interstratigraphic disturbances in sub-beds with flow capacity difference coefficients of 7.0 or less are relatively weak at the initial stage, and such sub-beds could be considered as one system for development; the interstratigraphic disturbances were intensified in the sub-beds under heavy water flooding after the medium and high-water-cut stage. The study results have an exemplary significance regarding the division and adjustment of thin interbedded sandstone reservoirs.

Key words: interbed, interlayer interference, flow capacity, formation combination, perforating optimization