Formulae were derived to predict additional pressure drops due to mechanical skin and non-Darcy effect in the perforation radial flow and wellbore radial flow.
在射孔径向流和井筒径向流中，推导出了机械表皮因子和非达西流影响引起的附加压力降的表达式。
2
The perforation diameter, speed as well as the power supply required are closely related to physical and mechanical properties of soil stratum.
它的穿孔直径和穿孔速度所需动力都与土层的各种物理力学参数有密切关系。
3
To find the cause of perforation corrosion in a boiler tube, the chemical composition, mechanical properties, microstructure of tubes, the corrosion product and the water quality have been analyzed.