孔喉尺度弹性调驱微球与储层匹配关系理论研究

储层的非均质性和高含水后期的孔隙结构变化是导致注水低效、无效循环的根本原因。通过分析油藏渗流规律，利用注采井组之间的调配见效时间定量描述了高含水开发后期强吸水层段的孔隙结构变化特征。根据储层喉道直径的分布特点，运用威布尔分布函数建立了与油藏初始状态匹配的微球直径计算模型，分别从开发后期水驱冲刷作用引起的孔喉结构变化和储层非均质性两个方面对微球直径计算模型进行了修正，得到了储层条件下弹性微球的直径范围；考虑微球吸水膨胀特性，最终得到了与高含水后期储层条件匹配的合成弹性微球的直径范围。建立的调驱弹性微球直径与储层物性参数、油水井日常生产参数及微球膨胀倍数间的匹配关系，为调驱设计时确定弹性微球直径提供了理论依据。 

The Relationship between Pore-Scale Elastic Microsphere and Formation Matching

Formation heterogeneity and pore structure change after waterflooding are the main reasons for low water injection efficiency and water cycling.By analyzing reservoir seepage law,pore structure change at high water-injected layer in later development stage was quantitatively described using the effective adjustment time between production and injection wells.On the basis of pore diameter distribution of microsphere,a model for microspheres diameter which matches the original reservoir condition was develope...