standpipe pressure

While with the increase of the circulating amount of the system, negative pressure gradient and slip velocity in the standpipe increase too.

而随着系统循环量的增加，立管内的负压差梯度以及滑移速度均增大；

In the throttle control box available, standpipe pressure is controlled by hand with lower accurate, by which underbalanced well drilling is hard to be performed.

现用节控箱采用手工控制立管压力（套管压力）的方法，精度较低，很难实现真正意义上的欠平衡钻井。

accurate computing method of standpipe pressure in conventional well killing process

常规压井过程中立管压力控制误差分析

The results showed that the pressure gradient in the riser and standpipe was gradually decreased with the superficial gas velocity, while it was increased with the circulating rate at the constant superficial gas velocity.

在提升管内表观气速一定的情况下随着循环量Gs的增加，提升管及立管内的压力分布也随之增大；

STUDY ON STANDPIPE-TRICKLING VALVE SYSTEM ⅰ. Gas-Solid Flow in Cyclone Dipleg under Negative Pressure Differential Gradient

立管-翼阀系统的研究Ⅰ.负压差下旋风分离器料腿内的气固流动