煤层气井两相流多参数探测技术

Multi-parameter detection of two-phase fluid in coal-bed methane wells

为充分认识煤层气排采过程中井筒气水两相流参数变化特征及流动规律,研制了煤层气井流体参数监测仪。该监测仪可对煤层气垂直井下油套环形空间气水两相流体压力、温度、液位、流速、密度分布以及气泡形态进行实时监测,为预测井下流体参数变化特征,研究气藏及井筒气水两相流动规律提供实测值。从监测仪的原理与结构出发,建立了井筒两相流关键参数(密度分布、气泡形态、流速)的探测方法。基于此,煤层气井流体参数监测仪在煤层气/页岩气排采,智能调控排采工况方面具有应用前景。

In order to find out the variation characteristics and flow laws of two-phase fluid in coalbed methane(CBM)wells,the fluid parameters detector was developed,which had the functions to not only monitor the fluid pressure,temperature,fluid level,velocity,density distribution and bubbles forms of two-phase fluid,but also provide actual data to forecast the variations characteristics or show flow laws of two-phase fluid in coalbed methane wells. Based on the working principles and structures of the detector parts,the detection methods of the key two-phase fluid parameters including density distribution,bubbles forms and flow were established. Therefore,the detector can be applied in CBM and shale gas drainage,as well as in intelligent gas drainage.