基于光纤光栅传感技术的井筒在线监测应用

Application of wellbore into on- line monitoring based on sensing technology of fiber bragg grating

20世纪80年代以来,有百余个立井井筒发生了不同程度的破坏,而井壁的破坏与井筒的受力密切相关.特别是淮南矿区井筒穿越深厚的表土层,井筒受力十分复杂,因此采用有效的手段对井筒的受力情况进行实时监测、预警十分必要.板集煤矿井筒破坏修复后根据井筒所处的地层情况在井筒套壁过程中分布埋入光纤光栅传感器,建立了可以实时监测井筒不同深度和部位受力情况的在线监测系统.通过井筒在解冻过程中各部位的应力应变监测情况应用分析,该系统可实时远程在线监测且效果良好.可见,该系统为分析井筒受力特征与相关因素,预测井筒受力发展趋势、井筒的破坏预测和及时维护具有重要意义.

Since the 1980 s,hundreds of vertical shafts have been damaged to some degrees,which has been closely related with the wellbore stress. Especially in Huainan coal mining area,shafts need to penetrate the deep pedosphere,bringing about very complicated wellbore stress. Thus,it is necessary to take effective means of shaft force to conduct real- time monitoring and early warning. After Banji coal mine＇s shaft repair,distributed fiber bragg grating sensors are embedded in the process of casing wall based on the formation conditions of the shaft,and the on- line monitoring system is established. Through the analysis of stress and strain of each part during the shaft thawing process,the system performs well in real time and on- line remote monitoring. Therefore,this system is of great significance in the analysis of stress characteristics and related factors,the prediction of the development trend of wellbore stress,the failure prediction and timely maintenance of the well bore.