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.
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。
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.
该工艺排液速度快，施工安全，可控制排液深度，尤其适用于含天然气井施工。
It has some advantages such as unloading very fast, operating safely, being able to control unloading depth and so on, and is especially applicable for operation in gas Wells.
因此，快速有效地排液复产，是保持气井产能、高效开发气田的关键。
Therefore, fast and effective solution to the row reproduction is to maintain gas production, and efficient development of a key gas field.
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。
Changes of liquid level are usually monitored with echometers and stable decompression is achieved by controlling the reducing rate of the liquid level.
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。
Changes of liquid level are usually monitored with echometers and stable decompression is achieved by controlling the reducing rate of the liquid level.
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