Simulation on stress distribution of drill pipes surface initial crack
In drilling process,drill pipes out surface always have lots of pits and scratches due to the corrosive and erosion of mud or wear of well wall in work environment.Through establishing drill pipes working model and constitutive equations with Finite Element Analysis Software,the paper have simulated stress distribution on drill pipe body under two different condition that without mechanical damage and with initial crack.Analysis results show that the maximum stress increases with the increasing of initial crack depth,and the maximum stress position turns to crack circumferential root from the crack radial root with the increasing of initial cracks depth.The analysis result is completely consistent with the actual morphology of crack propagation,as a result,the simulation analysis provides a effective new methods and reference for remaining life assessment and failure analysis of drill pipe.
drill pipe initial crack stress analysis simulation
Liu yonggang Li fangpo Ye dingpeng Teng xueqing
CNPC Tubular Goods Research Institute Drilling Tools Center, Southwest Company, Sinopec Petrochina Tarmi Oilfield Company
国际会议
香港
英文
460-464
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）