摘要
建立了考虑启动压力梯度和注采比因素的均质油藏数学模型。用数值方法对其求解。绘制并分析了不稳定压力动态典型曲线。研究表明 ,启动压力梯度和注采比对压力动态影响较大。对于开井压力降落情况 ,注采比小于 1时 ,压力及其导数曲线均上翘 ,生产压差增大 ;注采比大于 1时 ,压力及其导数曲线均下掉 ,生产压差减小。对于关井压力恢复情况 ,启动压力梯度和注采比越大 ,井底压力恢复得就越高。在低渗透油藏的测试资料分析中 。
The mathematical model with threshold pressure gradient and i njection- production ratio is constructed. The model is solved by numerical method. The ch aracteristics of transient pressure curves are plotted and analyzed. The study s hows that threshold pressure gradient and injection-production ratio have remark able effect on characteristics of transient pressure. For the case of pressure d ropdown test, pressure and its derivate type curves show the trend of rising whe n the injection-production ratio is less than 1.0, and the pressure drop of prod uction also get increased; vice versa, pressure and its derivate type curves sho w the trend of declining when the injection-production ratio is higher than 1.0, and the pressure drop of production get reduced. For the case of pressure build up test, the pressure buildup more highly as the threshold pressure gradient and injection-production ratio gets higher. Therefore, it is necessary to consider these factors in well test analysis.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2003年第6期57-59,共3页
Oil Drilling & Production Technology
关键词
启动压力梯度
注采比
数学模型
低渗透油藏
压力曲线
threshold pressure gradient injection-production ratio mat hematical model pressure type curves
