新疆油田长输管道阴极保护效果评价  

Evaluation on Cathodic Protection Effect of Long-Distance Pipeline in Xinjiang Oil Field

作　　者：徐佩君 李洪福[1] 廖臻 刘乐乐 程猛猛 陶文金 李媛媛[1] 王晨 吕祥鸿[2] XU Pei-jun;LI Hong-fu;LIAO Zhen;LIU Le-le;CHENG Meng-meng;TAO Wen-jin;LI Yuan-yuan;WANG Chen;LV Xiang-hong(Oil-Gas Storage and Transportation Company,PetroChina Xinjiang Oilfield,Karamay 831100,China;School of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]中国石油天然气股份有限公司新疆油田油气储运分公司,新疆克拉玛依831100 [2]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《材料保护》2023年第2期147-156,共10页Materials Protection

基　　金：国家自然科学基金项目(51902254);陕西省自然科学基金青年项目(2018JQ5108)资助。

摘　　要：在调研管道运行工况和阴极保护系统运行环境的基础上,依据广泛性、代表性、针对性原则,选取典型管道和测试点,通过现场挂片法测得管道的腐蚀速率和阴极保护度,以评价管道的阴极保护效果。结果表明:依据GB/T 21448-2017规定的最小保护电位和阴极电位负向偏移准则,对管道施加阴极保护后,管道的腐蚀速率明显低于0.01 mm/a,保护度在85%以上,总体阴极保护效果良好;对土壤电阻率较大的管道,建议采用100 mV阴极电位负向偏移准则。在管道阴极保护的实际运行过程中,需要对管道所处土壤的微生物含量和种类、杂散电流和最大保护电位进行重点监测,以便及时调整管道的阴极保护电位,避免管道产生较为严重的均匀腐蚀和局部腐蚀、氢损伤以及造成不必要的资源浪费。On the basis of the investigation on the operating conditions of the pipeline and the operating environment of the cathodic protection system,the typical pipelines and test points were selected according to the principles of universality,representativeness and pertinence,and the corrosion rate and cathodic protection degree of the pipeline were measured by the on-site coupon hanging to evaluate the cathodic protection effect.Results showed that the corrosion rate of the pipeline was significantly lower than 0.01 mm/a and the protection degree was above 85%after applying cathodic protection in accordance with the minimum protection potential and cathode potential negative offset criteria specified in GB/T 21448-2017.The overall cathodic protection effect was good.For pipelines with high resistivity to soil,100 mV cathode potential negative offset criterion was recommended.In the actual operation process of pipeline cathodic protection,soil microorganism amount and types,stray current and the maximum protection potential needed to be heavily monitored for timely adjustment of the cathodic protection potential of the pipeline for the purpose of avoiding relatively serious uniform corrosion,local corrosion,hydrogen damage and unnecessary waste of resources.

关 键 词：长输管道 阴极保护 腐蚀速率 保护度 

分 类 号：TG172.2[金属学及工艺—金属表面处理]