Abstract: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.
张广清,陈勉. 碳酸盐岩储层酸压后测试伤害的复合力学模型及其应用[J]. 岩石力学与工程学报, 2009, 28(S2): 3458-3463.
ZHANG Guangqing,CHEN Mian. COMPREHENSIVE MECHANICAL MODEL OF RESERVOIRS OF CARBONATE SALT ROCK AFTER ACID-FRACTURING DAMAGE AND ITS APPLICATION. , 2009, 28(S2): 3458-3463.