流压----油井正常生产时测得的油层中部压力。
临界流压是地层的特征参数，不随地层压力发生变化。
The critical flow pressure is a characteristics parameter which does not change with reservoir pressure.
随着井底流压降至某一临界值， 岩石骨架开始出现屈服。
When the flowing bottom hole pressure decreases to a critical value, the matrix will begin to yield .
完全的圆形流道截面能够提供最大的流量和最小的流压损失。
The full round port area provides maximum flow capacity and minimum head loss.
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