... liquid-level gauge 液位计 liquid level indicator 液面指示器；液面仪，液位计，液位指示器 liquid level instrument 液位仪表 ...
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在煤层气井排采过程中，通常用回声仪来监测环空液面变化，通过控制液面下降速度来实现稳定、连续降压。
The echometer was used to monitor the change of the annular water level in the coal- bed methane(CBM)wells production, which could decrease pressure stably and continuously.
根据物质平衡方法设计的拟液面测试仪，可通过测试油井环空排气量来确定油井的真实液面。
Based on the principle of mass balance, the Pseudo-Level Depth Finder can attain the true level by testing annular gas rate.
起下钻之前，检查泥浆罐液面、流量计和记录仪，并调整确定所有的报警功能。
Before trips, examine Pit Level and Flow Rate Instruments and Recorders and ActuateAlarms to determine that all are functioning.
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