摘要
某储气库注采井投入生产后经历多周期注采,长期承受交变载荷变化影响,其油管与油套环空、油套与技套环空、技套与表套环空可能会出现起压现象;同时,各级环空长期承受高压,易破坏井筒密封完整性,造成注入天然气窜漏,影响井控安全和正常生产。造成各级环空起压的原因多达十几种,该储气库目前仅依靠注采井压力、温度,以及环空保护液液面监测数据无法准确判断泄漏点和具体泄漏途径。为了精准治理和有效管控环空起压情况,引入基于DTS与DAS技术的光纤测试方法。文章介绍了DTS与DAS光纤测试技术原理,以及该技术在几口典型井中的应用情况。应用结果显示,利用该技术可有效判断漏点位置,为下一步对症治理环空起压现象提供支持,对其他储气库环空起压井的治理也有一定的参考意义。
After the gas storage well was put into production,it has undergone multiple cycles of injection and production and has been subjected to long-term alternating load changes.Pressure buildupmay occur in the oil pipe and oil sleeve annulus,oil sleeve and technical sleeve annulus,and technical sleeve and gauge sleeve annulus;meanwhile,long-term exposure to high pressure in various levels of the annulus can easily damage the integrity of the wellbore seal,causing natural gas injection leakage.This may affect well control safety and normal production.There are over a dozen reasons that may cause pressure buildup in various levels of the annulus.Current monitoring data covering pressure,temperature in injection/production wells,and annulus protection fluid level alone cannot accurately identify leakage points or specific leakage pathways in this gas storage.To enable precise remediation and effective control of annulus pressure buildup,fiber-optic monitoring methods based on DTS(Distributed Temperature Sensing)and DAS(Distributed Acoustic Sensing)technologies have been introduced.This paper introduces the principles of DTS and DAS fiber-optic monitoring technologies,along with their application in several typical wells.The results demonstrate that these technologies can effectively pinpoint leakage locations,providing support for targeted remediation of annulus pressure buildup.This approach also serves as a valuable refe-rence for the treatment of annulus pressure buildup wells in other gas storage facilities.
作者
乔松涛
刘海波
胡建合
李筱靓
王世鹏
Qiao Songtao;Liu Haibo;Hu Jianhe;Li Xiao-liang;Wang Shipeng(SINOPEC Zhongyuan Oilfield Gas Storage Management Center,Pu-yang,Henan,457000;Zhongyuan Gas Storage of PipeChina Energy Storage Technology Company,Puyang,Henan,457000)
出处
《石油化工设备技术》
2025年第4期61-66,I0004,共7页
Petrochemical Equipment Technology
关键词
储气库
环空起压
光纤
漏点
DTS
DAS
gas storage
annulus pressure buildup
fiber optic
leakage point
DTS
DAS
