摘要
国内CO_(2)管道输送,特别是超临界/密相CO_(2)管道输送存在工程应用上的空白,也无关于管材选择和断裂控制方面的标准规范。通过对国外CO_(2)管道输送管材选择和断裂控制的标准规范、工程案例进行归纳和研究,超临界/密相CO_(2)管道材料选择与断裂控制有关,断裂控制主要考虑抗起裂优化、限制韧性断裂扩展的长度和预防脆性断裂扩展等要素。其与石油天然气管道相比,存在长的减压波平台,导致裂纹尖端压力无法释放,裂纹容易长程扩展;同时,目前没有有效的模型可以准确计算超临界/密相CO_(2)管道止裂韧性。通过减压波特性计算分析,管材在选择合适管型、壁厚的前提下,可通过自身韧性进行止裂;通过管材延性起裂、止裂、断裂的计算分析和综合评价,可得出管材在自身韧性止裂的条件下,应满足的最小起裂、止裂韧性指标;当管材满足韧性止裂指标时,可通过自身韧性进行止裂,且不会发生长距离的裂纹扩展。
In view of the gaps in the engineering application of CO_(2) pipeline transportation in China,especially supercritical/dense phase CO_(2) pipeline transportation,there is no standard specification on pipe selection and fracture control.Through the induction and study of foreign standard specifications and engineering cases of CO_(2) pipeline pipe selection and fracture control,supercritical/dense phase CO_(2) pipeline material selection is related to fracture control,which mainly considers the optimization of crack resistance,limitation of the length of ductile fracture expansion,and prevention of brittle fracture expansion.Compared with oil and natural gas pipelines,there is a long decompression wave platform,which leads to the failure to release pressure at the crack tip,and the crack is easy to extend in long range.At the same time,there is no effective model to accurately calculate the crack arrest toughness of supercritical/dense phase CO_(2) pipelines.Through the calculation and analysis of the decompression wave property,under the premise of selecting the appropriate pipe type and wall thickness,the pipe can be prevented from cracking by its own toughness.Through the calculation analysis and comprehensive evaluation of ductility cracking initiation,cracking arrest and fracture of pipes,the minimum cracking initiation and cracking arrest toughness indexes that pipes should meet under the condition of self-toughness cracking arrest can be obtained.When the pipe meets the toughness crack arrest index,it can be stopped by its own toughness,and no long-distance crack propagation will occur.
作者
蒋风松
汪璐
曹毅渊
JIANG Fengsong;WANG Lu;CAO Yiyuan(Daqing Oilfield Design Institute Co.,Ltd.)
出处
《油气田地面工程》
2023年第10期82-88,共7页
Oil-Gas Field Surface Engineering
关键词
CCUS
管材选择
断裂控制
止裂韧性
裂纹扩展
CCUS
pipe selection
fracture control
crack arresting toughness
crack propagation
