The causes are presented as follows: packer unloading pressure, formation damage, oil tool plugging, formation voidage, the worst formation physical properties and the effect from vicinage wells.

污染或工具堵塞;压;物性极差;邻井影响等。

A new multiflow model of a pressurized spout fluid bed with a draft tube has been developed to investigate the voidage and the velocities of particle and gas in spout and annular region.

采用双体模型对增压导向式化床内和环形气固运速度和空隙率进行数值模拟。