Failure analysis of anticorrosion plastic alloy composite pipe
- 作者：LI Hou-buQI Dong-taoDING NanCAI Xue-huaWEI BinQI Guo-quan
- 会议时间：2014-05-01
- 关键词：cracks ; degree of cure ; oil-field ; failure analysis
- 作者单位：CNPC Tubular Goods Research Institute,Xi'an,China 710077
- 母体文献：2014油气井管柱与管材国际会议论文集
- 会议名称：2014油气井管柱与管材国际会议
- 会议地点：西安
- 主办单位：中国石油学会
- 语种：chi
摘要
Incident involving failures of anticorrosion plastic alloy composite pipe which was used for oilfield gathering and transportation had caused serious burst after several years of usage.Investigations were performed to identify the most probable causes of the pipe failures.The study was conducted by reviewing the background of the incident, visual physical inspection, FTIR spectra and TG-DSC curves of inner plastic alloy and resin in outer GRP layer.Results revealed that additives in damaged plastic alloy may not be stirred enough before extrusion or the content of additives may exceed their normal range.The lower degree of cure for resin of GRP layer leads to decrease of glass transition temperature as well as its thermal stability, which will make the outer GRP structural layer have a relatively lower mechanical property, thus giving rise to final failure of the composite pipe under the long time service conditions.