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.
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。
Fracture operation is one of the important manners for exploitation of CBM and to obtain enough information is very critical for fracturing treatment in a coal bed methane formation.
压裂是煤层气开采的重要手段之一，而压裂前获取煤层相关地层参数，对压裂设计及压裂施工十分必要。
The development of Coal bed Methane (CBM) has made greater progress in recent years.
近年来，煤层气开发取得了较大进展。
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