油气田管道HDPE内衬技术的应用

随着国内外油气田的深度开发,介质工况愈发复杂苛刻,高密度聚乙烯(High Density Polyethylene,HDPE)内衬技术是控制油气田地面集输系统及注水系统腐蚀泄漏、延长管道服役寿命的重要措施之一。基于等径压缩HDPE管的内衬原理,结合国内外标准规范,从设计、施工、经济性3方面进行对比分析,提出了HDPE内衬管的材料性能要求、HDPE内衬技术的适用工况、内衬管与基管的结合形式、放空口设计原则,以及基于安装和存储最小壁厚、内衬层稳定性和抗塌陷强度三个方面确定的HDPE内衬管壁厚。对比了不同HDPE内衬管技术的接头形式,提出优先考虑法兰连接方式。介绍了HDPE内衬技术的施工安装工序和热煨弯头内衬的形式,并对施工质量控制关键点和要求进行总结。对比不同油气田管道选材方案的经济性,以期推动HDPE内衬管在油气田管道的应用,从而更好地解决管道腐蚀泄漏问题。

Application of HDPE lining technology for pipelines in oil and gas fields

With the deep development of domestic and international oil and gas fields,due to the complicated and harsh medium conditions,high density polyethylene(HDPE)lining technology becomes one of the important measures to control the corrosion leakage of the surface gathering&transportation system and water injection system in oil and gas fields and to extend the service life of pipelines.With the lining principle of isodiametric compression for HDPE liner and in accordance with the domestic and foreign standards and specifications,the material performance requirements of HDPE liner,the applicable conditions of HDPE lining technology,the fitness of liner with the base pipe and the design principles for vents were proposed from the 3 aspects of design,construction and economy.Moreover,the wall thickness of HDPE liner was determined based on the minimum thickness for installation&storage,the stability and the collapse resistance of liner,and through comparative analysis on the joint type of different HDPE liner technologies,it was proposed to consider the flange joint preferably.In addition,the construction&installation process of HDPE liner and the lining form of hot induction bend were introduced,the key points and requirements of construction quality control were summarized,and the economic efficiency of different material selection schemes for pipeline in oil and gas field was compared,so as to advance the application of HDPE liner technology in oil and gas fields and to solve the problem of pipeline corrosion leakage in the oil and gas fields.