中俄东线天然气管道运行保障关键技术

在中俄东线天然气管道投产后的运行阶段,因其高钢级、大口径、高压力、大输量的特点,且沿线途经高寒冻土区,故管道运行的不确定性因素多、风险高、维护与安全保障难度大。系统分析了中俄东线天然气管道在运行工艺方面面临的管网优化运行、冬季调峰、冰堵防治及放空回收等问题;在完整性管理方面面临的大口径管道内检测、高钢级管道安全状态评估等问题;在线路风险防控方面面临的天然气管道泄漏与安全状态监测、腐蚀、冻涨融沉防治等问题;在维抢修方面面临的管径1 422 mm管道的切割、退磁、修复等系列技术难题。归纳总结了国内外相关技术现状,提出解决问题的技术思路,总结了中俄东线天然气管道工程目前已取得的部分技术成果,以期为未来油气管道的建设与运营提供参考。(参52)

Key technologies for operation guarantee of China-Russia Eastern Gas Pipeline

China-Russia Eastern Gas Pipeline has been in the operation stage after commissioning,however,the high steel grade,large diameter,high pressure and large transportation capacity,as well as the cold frozen zone along the pipeline,all pose great challenges to the operation of the pipeline,such as enormous uncertainty,high risks,difficulty in maintenance and security,etc.The problems that may exist in the pipeline technology were elaborated,including optimal operation of the pipeline network,peak shaving in winter,prevention and control of ice blockage,venting and recovery,etc.In the aspect of integrity management,the pipeline was facing problems like in-line inspection of large-diameter pipeline and evaluation of safety status of high-grade steel pipeline.In terms of line risk control,there would be problems such as gas pipeline leakage and safety status monitoring,corrosion,prevention and control of frost heaving and thawing settlement,etc.As for maintenance and repair,a series of technical problems represented by cutting,demagnetization and repair of D 1 422 mm pipeline needed to be solved.The status of related technologies in China and abroad were summarized and technical solutions for the problems were proposed.In addition,some of the technological achievements that have been made in China-Russia Eastern Gas Pipeline were summarized to provide reference for the construction and operation of oil and gas pipeline in the future.