复杂非均质碳酸盐岩储层水平井酸化高效布酸基础理论研究

针对复杂非均质性碳酸盐岩储层水平井酸化的技术难题，设计应用大尺度三维可视化实验手段模拟酸蚀蚓孔的动态延伸过程，深入研究复杂非均质性碳酸盐岩储层条件下的蚓孔扩展延伸机理和VES自转向酸在多因素控制机制下的转向机理,建立三重非均质尺度下的全局蚓孔延伸三维数学模型，模拟真实地层条件下蚓孔的立体延伸、竞争发育和转向扩展的动态过程，丰富长井段水平井酸化理论。同时建立多因素控制机制下描述VES自转向酸转向行为的数学模型，并与水平井非均质伤害模型、水平井变质量井筒流动模型和蚓孔立体延伸模型结合，建立复杂非均质性碳酸盐岩储层水平井高效酸化的综合理论模型，提出不同工艺条件下水平井有效布酸的仿真数学模型，优化水平井酸化工艺方法，推动水平井分段酸化和转向酸化工艺技术集成发展，大幅度提升酸化效果。

Aiming at solving technical problems of acidizing horizontal wells in complex anisotropic carbonate reservoirs, large-scale 3D visual experimental methods are built to characterize the whole process of wormhole dynamic propagation. By this means, wormhole propagation mechanism in carbonate reservoir with complex heterogeneity and diverting mechanism of VES self-diverting acid controlled by multiple factors are deeply researched. An overall 3D wormhole propagation model affected by three scales of heterogeneities is proposed to simulate the 3D propagation, competition and diverting process under real formation condition, thus horizontal well acidizing theory is enriched. After that, a multifactor-controlled VES diverting model is built to combine with horizontal well wellbore flow model and overall 3D wormhole propagation model to set up the comprehensive theoretical model for horizontal well high-efficiency acidizing. On this basis, effective acid-placement models for different acidizing technologies are proposed to optimize technologies and operating parameters. Staged acidizing technology and diverting acidizing technology for horizontal wells are then developed, and stimulation effect is improved most economically.