煤层气田集输管道腐蚀分析及隐患治理  

Corrosion and Hidden Dangers Treatment of Gathering and Transporting Pipeline in Coalbed Methane Field

作　　者：赵森 杨华宇 白德豪 张良军 翟明 李振金 ZHAO Sen;YANG Huayu;BAI Dehao;ZHANG Liangjun;ZHAI Ming;LI Zhenjin(CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Xinzhou Company,PetroChina Coalbed Methane Company Limited,Xinzhou,Shanxi 036600,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,陕西西安710077 [2]中石油煤层气有限责任公司忻州采气管理区,山西忻州036600

出　　处：《石油管材与仪器》2024年第5期64-68,共5页Petroleum Tubular Goods & Instruments

摘　　要：对某煤层气区块以环氧煤沥青为外防腐涂层的20#钢集输管道腐蚀进行研究。模拟计算结果表明,管道运行20 a后,外防腐涂层失效,管道在含有铁氧化细菌(IOB)的土壤环境下腐蚀速率为0.075 mm/a。现场开挖验证显示,管道壁厚实际减薄2.1 mm,实际腐蚀速率为0.105 mm/a。经安全评价,该条管道运行存在安全风险,减薄处的缺陷不可接受。采取玻璃纤维结合高分子材料对壁厚减薄处进行修复补强可降低管道运行风险。Corrosion of the 20# steel gathering and transporting pipeline with epoxy coal asphalt as the external anti-corrosion coating in a coalbed methane block was studied.Simulation results show that after 20 years operation,the external anti-corrosion coating failed and the corrosion rate of pipeline was 0.075 mm/a in soil containing iron oxidizing bacteria(IOB).The field excavation verifies that the actual thickness of the pipeline reduces by 2.1 mm and the actual corrosion rate is 0.105 mm/a.The results of safety evaluation show that there is risk in the operation of the pipeline and the defects in the thinned section are not acceptable.Glass fiber and polymer material can be used to repair and reinforce the thinned wall to reduce the risk of pipeline operation.

关 键 词：外防腐涂层 腐蚀 安全评价 修复补强 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]