Monitoring of produced fluid of coal content in coalbed methane wells

Lots of slack coals are produced in the production of coalbed methane, and the slack coal concentration cannot be continuously metered. A laboratory test was conducted to assess the compensation of flow temperature/flow rate to slack coal concentration, and a method for computing the slack coal concentration in the fluid produced from the coalbed methane well was established according to the principle of mass conservation. Furthermore, a real-time monitoring device suitable for slack coal concentration in the fluid produced from the coalbed methane well was developed. This device can monitor the produced fluid density value through a differential pressure type density sensor, and transmit the value to data terminal in real time, so that the real-time slack coal concentration of produced fluid can be obtained through data conversion. Field application shows that the slack coal concentration monitoring device can realize real-time remote data monitoring, with the accuracy subject to the field requirement, which provide bases for the field control of slack coals and the arrangement of production system.