煤层气井产出液煤粉含量监测

摘要

Lots of slack coals are produced in the production of coalbed methane, and the slack coal concentration cannot be con-tinuously metered. A laboratory test was conducted to assess the compensation of lfow temperature/lfow rate to slack coal concentration, and a method for computing the slack coal concentration in the lfuid produced from the coalbed methane well was established accord-ing to the principle of mass conservation. Furthermore, a real-time monitoring device suitable for slack coal concentration in the lfuid produced from the coalbed methane well was developed. This device can monitor the produced lfuid 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 pro-duced lfuid 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 ifeld requirement, which provide bases for the ifeld control of slack coals and the arrangement of production system.%针对目前煤层气井排采过程中出煤粉状况严重且无法实现连续煤粉含量计量的问题，通过开展流体温度、流量对煤粉含量的补偿室内评价实验，并基于质量守恒原理建立了煤层气井产出液煤粉含量的计算方法。同时开发出一套适用于煤层气井产出液煤粉含量的实时监测装置，该装置通过压差式密度传感器监测产出液密度值，并实时传输至数据终端，通过数据转换得到实时产出液煤粉含量值。现场应用表明，煤粉含量监测装置可实现实时远程数据监测，且监测精度满足现场技术需求，为现场防煤粉控制、排采工作制度的制定提供依据。