中文摘要：

基于碳酸盐岩储层酸压的特点,考虑到固体变形和流体流动的相互作用关系,建立包含未酸蚀区、酸蚀区和支撑裂缝的复合力学试油模型。不同区域中的渗流参数随应力的改变不同。根据弹性力学,针对未酸蚀区和酸蚀区地层,建立孔隙度变化模型;针对支撑裂缝通过裂缝导流能力试验建立支撑裂缝的渗透率变化模型,发现对于特定支撑剂,作用于酸蚀区地层上闭合压力超过酸蚀岩石的抗压强度时,支撑裂缝的渗透率的变化模式改变,支撑剂嵌入造成不可恢复的伤害。考虑到不同区域的差别,采用固液耦合的算法计算有效应力的分布规律。现场应用表明,模型预测结果与实测数据基本吻合。

英文摘要：

Based on the characteristics of acid fracturing and the relationship of solid deformation and liquid flow,a comprehensive model for production testing is proposed,which includes intact region,etched region and propped fracture.The effects of effective stress on fluid parameters are different in different zones.Based on elasticity mechanics,for intact and etched regions,a model for change of porosity is established,and fracture conductivity tests are conducted to obtain a model of permeability change with effective normal stress.It is found that,for specific proppants,the change pattern of permeability of propped fracture changes when the closure stress exceeds compressive strength of etched rock which shows a permanent damage by proppant embedment.Considering the difference of three zones,a solid-liquid coupling algorithm is presented to calculate the distribution of effective stress.The measured data agree well with model results by field application.