石油与天然气化工2026，Vol.55Issue(3)：119-124,6.DOI:10.3969/j.issn.1007-3426.2026.03.013
页岩气井内涂层油管穿孔失效原因分析
Cause analysis of perforation failure of internally coated tube in a shale gas well
摘要
Abstract
Objective This study aims to clarify the causes of the perforation failure of internally coated tube in a shale gas well in Sichuan Province.Method Failure analysis was carried out in the failure internally coated tube by macroscopic morphology analysis,physical and chemical property testing,corrosion product analysis,and microscopic morphology analysis of the coating.Result Corrosion of the failed internally coated tube occurred from the outside inward,leading to perforation.The gas flow scoured the inner surface of the coating from the outside inward,resulting in coating detachment.The microstructure,chemical composition,yield strength,and tensile strength of the base material of the tubing met the standard requirements,while the elongation was slightly below the specified value.Corrosion product analysis indicated that the failure was caused by CO2 corrosion.Conclusion CO2 corrosion occurred on the outer wall of the internally coated tube,and Cl-promoted the development of localized corrosion pits.Additionally,gas lift scouring led to the detachment of the internal coating,resulting in failure.关键词
页岩气/内涂层油管/失效分析/CO2腐蚀Key words
shale gas/internally coated tube/failure analysis/CO2 corrosion引用本文复制引用
李虹杰,黄洪发,苗超,朱文旭,宋宇,黄红兵,唐楠,贺建峰..页岩气井内涂层油管穿孔失效原因分析[J].石油与天然气化工,2026,55(3):119-124,6.基金项目
中国石油西南油气田公司科技项目"柱塞气举用耐磨内涂层技术研究"(2024D103-02-09) （2024D103-02-09）
