连续油管液压丢手工具断裂分析及预防  

Fracture Analysis and Prevention of Hydraulic Releasing Tool of Coiled Tubing

作　　者：乔凌云[1,2] 李鸿斌 黄晓江[1,2] 芦琳 周云[1,2] 张超 QIAO Lingyun;LI Hongbin;HUANG Xiaojiang;LU Lin;ZHOU Yun;ZHANG Chao(Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Chinese National Engineering ResearchCenter for Petroleum and Natural Gas Tubular Goods,Baoji 721008,Shaanxi,China;Shaanxi Province KeyLaboratory of High Performance Coiled Tubing,Baoji 721008,Shaanxi,China)

机构地区：[1]宝鸡石油钢管有限责任公司,陕西宝鸡721008 [2]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [3]陕西省高性能连续管重点实验室,陕西宝鸡721008

出　　处：《焊管》2021年第10期33-37,共5页Welded Pipe and Tube

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“煤炭地下气化关键技术研究与先导试验”(项目编号GF 2019E-25)。

摘　　要：针对连续油管井下作业工具液压丢手的断裂失效问题,通过理化检验、断口分析等检测手段对断裂原因进行了分析。结果表明,丢手工具断裂失效主要是由于H2S应力腐蚀导致,氢的浸入使得材料塑性、韧性急剧下降,由于材料硬度偏高,在含硫腐蚀环境中服役,同时在拉伸应力和应力集中的作用下,导致了丢手断裂失效。建议作业单位重视井下工具的选材、防护、检测及全寿命管理,避免油气开采过程中作业工具失效的问题。Aiming at the fracture failure of coiled tubing downhole operation hydraulic releasing tool,the fracture cause is analyzed by means of physical and chemical inspection and fracture analysis.The results show that the releasing fracture failure is mainly caused by hydrogen sulfide stress corrosion.The immersion of hydrogen makes the plasticity and toughness of the material drop sharply.Due to the high hardness of the material,working in sulfur-containing corrosive medium,and the existence of external tensile stress and stress concerntration,the hydraulic releasing fracture failure is caused by combination of the three.It is suggested that the selection,protection,detection and life-cycle management of downhole tools should be focused,and the faliture of operation tools in the process of oil and gas production should be avoided.

关 键 词：连续油管 液压丢手 失效分析 硫化氢应力腐蚀 应力集中 

分 类 号：TG172.9[金属学及工艺—金属表面处理]