钢质管道Hi-Lock过盈承插接头适用性研究

Study on the Applicability of Hi-Lock Interference Socket Joints for Steel Pipelines

利用内窥镜,无损检测仪,电火花检漏仪对现场服役后管段承插部位涂层完整性,厚度及附着力等进行检测,通过冲击试验,高温高压腐蚀模拟试验,水压爆破试验和有限元计算,对现场过盈承插钢质管道连接处涂层的耐蚀性,密封完整性及连接处结构力学性能进行评价。结果表明:Hi-Lock过盈承插接头连接处涂层的基本性能和力学性能良好;现场服役后的Hi-Lock接头连接处表面未发生腐蚀失效,具有良好的耐蚀性;对于存在4 MPa内压作用的过盈承插管道接头,根据力学建模结果计算,其轴向拉伸失效载荷约为275 kN,轴向压缩失效载荷约为337 kN,其端部集中弯矩失效载荷约为15.4 kN·m,管段具有较好的力学稳定性。Hi-Lock过盈承插接头满足油田现场相关标准和设计要求。

The integrity,thickness,and adhesion of the coating on the socket and socket parts of the pipe section after on-site service were tested using an endoscopy,non-destructive testing,and electric spark leak detector.The corrosion resistance,sealing integrity,and structural mechanical properties of the coating at the joint of the interference socket and socket steel pipeline were evaluated through impact tests,high-temperature and high-pressure corrosion simulation tests,hydraulic blasting tests,and finite element calculations.The results showed that the basic properties and mechanical properties of the coating at the joints of Hi-Lock interference socket joints were good.After on-site service,the surface of the Hi-Lock joint connection did not undergo corrosion failure and had good corrosion resistance.For interference socket pipe joints with an internal pressure of 4 MPa,calculation based on the mechanical modeling results showed that the axial tensile failure load was about 275 kN,the axial compression failure load was about 337 kN,and the concentrated bending moment failure load at the end was about 15.4 kN·m.The pipe section had good mechanical stability.The Hi-Lock interference socket joint met the relevant standards and design requirements of the oilfield site.