摘要
基于低渗非达西渗流和变形介质渗流理论,推导了污染井酸化前后的产能预测模型和井底压力损失表达式,定义了低渗变形介质油藏污染井酸化前后的表皮因子,并对污染井酸化前后的产能变化规律进行了研究。结果表明,低渗透油藏随着储层应力敏感效应和启动压力梯度的增大,产能明显降低,增大生产压差有利于克服其不利影响;酸化半径内启动压力梯度的改变对表皮因子的改善有重要影响,改变幅度越大对表皮因子的改善越有效。
Based on theories of non-Darcy percolation in low permeability reservoirs and percolation in deformed media, a producing predictive model and an expression for bottom hole pressure loss have been derived in conditions of before and after acidizing operation for a polluted well, Also, a concept of skin factor is defined to research damage degrees before and after acidizing in low permeability and deformed media reservoir. Moreover, its productivity change is researched. The results show that producing reducibility is evident along with the increase of stress-sensitivity and start-up pressure gradient, therefore, increasing the pressure gap of pro- duction can get over the disadvantage; The change of start-up pressure gradient within the radical of acidizing plays a important role to improving of skin factor; larger the variational range of this pressure, more effective the improvement.
出处
《石油钻探技术》
CAS
北大核心
2006年第5期73-75,共3页
Petroleum Drilling Techniques
关键词
低渗透油气藏
变形
启动压力
压力梯度
地层损害
酸化半径
low permeability pools
deformation
starting pressure
pressure gradient
formation damage
acidizing radius
