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滑水鞋
石油机械
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CHINA PETROLEUM MACHINERY2018年第46卷第3期
液氮散热器铁成军1燕云1张娟2赵海勇3
nand闪存(1.中石油长庆油田第八采油厂2.中石油长庆油田第六采油厂3.中石油长庆油田第十一采油厂）
摘要：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。
关键词：水泥环；密封性；光纤传感技术；电缆；微应变
中图分类号：TE925 文献标识码：A doi:10. 16082/jki.issn. 1001-4578.2018.03.005 Experimental Study of Fiber Optic Sensing Technology for
Monitoring Cement Sheath Sealing
Tie Chengjun1Yan Yun1Zhang Juan2Zhao Haiyong3
(1. No. 8 Oil Production Plant o f PetroChina Chongqing Oilfield Company；2. No. 6 Oil Production Plant o f PetroChina Chan-gqing Oilfield Company \3. No. 11 Oil Production Plant o f PetroChina Chongqing Oilfield Company)
Abstract：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 v
微拟球藻alues 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-destxuctive 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.鞋帮
Keywords：cement sheath；sealing；optical fiber sensing technology；cable；micro-strain
0引言
水泥环密封性受到诸多因素的影响，固井注水 泥作业过程中，如果水泥浆顶替泥浆流动不是全面 的平行推进，会导致水泥环中出现空隙、裂缝或通道[1]。固井作业过程中或结束后，温度和压力变 化可能导致水泥环中出现微环[2]。即使在水泥浆 凝固后，钻井、完井、增产和生产作业过程中复杂 的井下环境因素都有可能引起水泥环开裂。一旦这 些裂缝和空隙连接起来，就为不同层位的油气运移 和流通提供了通道。因此，评价水泥胶结质量和检
*基金项目：中石化前瞻项目“非油气领域科技成果的启示作用跟踪调研”（JP14023)的部分内容。
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