检测水泥环密封性的光纤传感技术试验研究

Experimental Study of Fiber Optic Sensing Technology for Monitoring Cement Sheath Sealing

水泥环密封失效将导致地下流体窜槽和井口环空带压,影响油气井产能和生产作业安全,光纤传感系统能够通过检测水泥环中不必要的油气确认水泥环密封性是否失效。为了推动检测水泥环密封性的光纤传感技术的发展,介绍了DTSS数据采集装置的工作原理,设计了光纤校准试验装置,测试了电缆淹没在不同测试液中的应变值,分析了电缆对各种液体的敏感性。分析结果表明:光纤传感技术采用分布式温度和应变传感(DTSS)数据采集装置,以及最新设计的能够检测水泥环中油气的光纤传感电缆实现了水泥环密封性的实时、原位、连续和非破坏性监测,节约了成本,降低了风险。所得结果为光纤传感系统的进一步研究和现场应用奠定了基础。

Failure of cement sheath seal will lead to underground fluid channeling and annulus pressuring,which will affect the productivity of oil and gas wells and the safety of production operation. The optical fiber sensing system can identify whether the cement sheath seal fails by detecting unnecessary oil and gas in the cement sheath. To promote the development of optical fiber sensing technology for detecting the cement sheath seal,the working principle of DTSS data acquisition device was introduced. The optical fiber calibration test device was designed. The strain values of cable submerged in different test liquids were tested. The sensitivities of cable on different liquid were analyzed. The results show that,by means of the distributed temperature and strain sensing data acquisition device and the newly designed optical fiber sensing cable,the optical fiber sensing technology could achieve real-time,in-situ,continuous and non-destructive monitoring of cement sheath sealing,contributing to saving cost.The results obtained laid the foundation for further research and field application of optical fiber sensing system.