PET纤维增强柔性复合管耐高温性能实验

1. 中国石油集团公司石油管工程技术研究院, 陕西西安 710077;
2. 中国石油股份公司塔里木油田分公司, 新疆库尔勒 841000

1. Tubular Goods Research Institute, CNPC, Xi'an, Shaanxi, 710077;
2. PetroChina Tarim Oilfield Company, Korla, Xinjiang, 841000

为了突破苛刻油气田环境下柔性复合管的应用局限, 采用内衬层为PE80、增强层为PET 纤维的柔性复合管, 利用高温高压釜, 差热扫描仪, 热变形、维卡软化温度测试仪, 红外光谱仪, 万能试验机和承压设备等对其内衬层、增强层及整管耐高温性能进行研究。结果表明:高温对柔性复合管内衬层PE80 的环境相容性、力学性能及结构组成影响不大, 但对增强层PET 纤维的拉伸性能、整管水压爆破强度值影响明显;柔性复合管在1 000 h 存活试验中失效, 因此, 不建议在95 ℃及以上温度使用。

Against the limitations of flexible composite pipe in harsh field conditions, the flexible composite pipe consisting of PE80 inner pipe and PET fiber reinforced pipe is adopted. The performances of inner pipe, reinforced pipe and the whole composite pipe under high temperature are analyzed by using HTHP pot, differential thermal scanner, thermal deformation and vicat softening temperature tester, infrared spectrometer, universal testing machine and pressure equipments. The results show that high temperature has little impact on environmental compatibility, mechanical properties and structural composition of PE80 inner pipe, but significant impact on tensile properties and the entire hydrostatic burst strength values of PET fiber reinforced pipe. The flexible composite pipe fails in 1 000 hr survival testing, therefore, it is not recommended at temperatures above 95 ℃.