Proppant back-production prediction software is also present in this paper, which can determine the critical gas flow rate and critical daily yield for proppant flowing back.

根据上述的基础理论研究，编制了压裂气井生产过程中支撑剂回流预测软件，该软件可预测支撑剂发生回流的临界气流速度和临界气井产量。

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When gas flow velocity in a wellbore is less than a critical gas flow velocity maintaining continuous flowing back in a gas well, a liquid carrying phenomenon occurs in the gas well.

当井筒内气流速度低于维持气井连续排液的临界气流速度时，气井出现携液现象。

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The critical rate of gas flow from bubble flow to slug flow is an important factor.

泡状流向段塞流转化的临界气体流量是一个非常重要的参数。

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Though a program displays panels showing all the critical processes of a real rig (fire and gas detectors, valve status, oil flow from the sea bed and so on), and then responds to the actions of the trainee by altering these displays appropriately, a human operator can intervene at any time if things seem to be going too smoothly.

ECONOMIST: Virtual reality