Due to the complication and variety in the hole especially the time that is needed to transmit pressure it is very inconvenient to use choke valve to control standpipe pressure.
但井下情况复杂多变，尤其是压力传递需要时间，给调节节流阀控制立压带来不便。
Drilling parameters typically include flow rate, pump pressure, standpipe pressure (SPP), pipe rotation (RPM), weight on bit (WOB), rate of penetration (ROP) and pit volume (PVT).
流量、泵压、钻压以及机械钻速等常用钻井参数还可用于监测井涌和泥浆漏失。
The negative pressure gradient and slip velocity in standpipe increase with the increase of circulating rate.
随着循环量的增大，立管内的负压差梯度及气固相对速度也随之增大；
Through this high pressure line, mud is pumped in to the standpipe and drill pipe.
通过这根高压管线，泥浆被泵入立管和钻忏杆。
The total pressure drop in hung-up regime is approximately equal to that in the standpipe.
并且证明悬料区的总压降可以近似等于立管的压降。
The total pressure drop in hung-up regime is approximately equal to that in the standpipe.
并且证明悬料区的总压降可以近似等于立管的压降。
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