非均匀载荷下套管磁记忆内检测器变径能力
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关键词：套管内检测器；磁记忆检测；非均匀载荷；变径能力；有限元分析；力学模型中图分类号：TE931文献标识码：A DOI：10.12473/CPM.202503067
Diameter-Adaptability of Casing Magnetic Memory Inner Detector Under Nonuniform Loading
Sun Jing1.² Zhang Laibin1，²Fan Jianchun1.2*Wang Yanran34 Chen Qian1.²Zhang Zhitong1，2 （1.CollegeofSafetyandOceanEngineeing，China UniversityofPetroleum（Bejing）;2.KeyLaboratoryofOilndGasProductionSafetyandEmergency TechnologyEmergencyManagementDepartment;3.ZhejiangAcademyofSpecialEquipment Science; 4.Zhejiang Provincial Key Laboratory of Safety Inspection Technology for Special Equipment）
Abstract：Tooptimize the structural design ofthecasing magnetic memory innerdetectorand improve its adaptabilityunder complex working conditions，a casing magnetic memory inner detector applicable to horizontal wells was developed by integrating centralizer mechanisms with sensor modules.An equilibrium equation for diameteradjustment mechanism with spring damping was established，a mechanical modelof the inner detector was built，and the Comsol finite element analysis software was used to simulate its diameter variation processunder gravity and nonuniformloading，obtaining the keyparameters such as stress，strain distribution and diameter variation of the inner detector.Moreover，ful-scale four-point bending and shear tests were conducted to verify the passing ability and diameter-adaptabilityof the innerdetectorinbentcasing and locally plasticdeformed casing.The studyresults show thatunderitsown weight，the sensordisplacementof theinnerdetectoris about3.5mm.Springdamping can significantly suppress deformations；under nonuniform loading conditions，sensors experiencecompression on one side and relaxation onthe other，with the maximum lift-offdistance between front and rear sensors reaching 5mm，verifying the regulatory effect of spring damping on the diameter variation behavior.The established mechanical model can effectively predict the diameter variation behaviorof the inner detector under non-uniform loading conditions.The study results provide technical support for improving the reliability and safety of casing damage detection.
Keywords：casing inner detector；magnetic memory detection； nonuniform loading；diameter-adaptability; finite element analysis；mechanical model
0 引言
油气井套管的主要功能是加固井壁、隔离复杂地层、控制流体压力，是保障钻井安全和油气生产稳定的核心部件[1]。（剩余12789字）
