摘要
目的 复合连续管缆在渤海N油田B48蒸汽吞吐井首次开展入井试验约1个月即发生开裂,为弄清管缆开裂原因,优选出适用于海上蒸汽吞吐井井况的管缆材料。方法 对开裂的CT90材质管缆开展了腐蚀失效分析,并对2205材质管缆的母材及焊缝按照相关标准开展了氢致开裂(hydrogen-induced cracking, HIC)和硫化物应力开裂(sulfide stress cracking, SSC)评价试验。结果 CT90材质失效原因为管缆焊缝未正火处理,导致焊缝晶粒粗大,晶粒中大量铁素体针片形成的脆弱面,使金属的柔韧性下降,在H2S环境中发生SSC,2205材质管缆母材及焊缝通过HIC和SSC试验后均未出现开裂。2205材质的复合连续管缆在海上蒸汽吞吐井试验后也未发现开裂。结论 2205材质相对于CT90材质在蒸汽吞吐环境中适应性更好,能够满足海上蒸汽吞吐井的生产需求。
Objective The composite coiled tubing cable occurred cracking about one month after the first test in the B48 steam huff and puff well of N Oilfield in the Bohai Sea.It is necessary to determine the causes of the cable cracking and to optimize the most suitable cable material for offshore steam huff and puff well conditions.Method A corrosion failure analysis was conducted on the cracked CT90 material cable,and hydrogen-induced cracking(HIC)and sulfide stress cracking(SSC)tests were conducted on both the base material and welds of a 2205 material cable in accordance with relevant standards.Result The failure of the CT90 material was attributed to the absence of normalizing treatment on the cable welds.The untreated welds exhibited coarse grains,with numerous ferrite needles forming brittle planes within the grains,resulting in reduced ductility,leading to SSC in the H2S environment.The base material and welds of the 2205 material cable exhibited no cracking after undergoing HIC and SSC tests.Field testing also revealed no cracking in the 2205 material composite coiled tubing cable following its use in an offshore steam huff and puff well.Conclusion The 2205 material exhibits superior adaptability to steam injection environments compared to the CT90 material,thereby meeting the production requirements of offshore steam huff and puff wells.
作者
戚亚东
吴华晓
方涛
尚宝兵
张华
王通
QI Yadong;WU Huaxiao;FANG Tao;SHANG Baobing;ZHANG Hua;WANG Tong(Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin,China;Oilfield Production Department,China Oilfield Services Limited,Tianjin,China)
出处
《石油与天然气化工》
北大核心
2025年第6期109-115,共7页
Chemical engineering of oil & gas
基金
中国海洋石油有限公司“十四五”重大科技项目“海上稠油热采有效开发技术—渤海典型稠油油藏热采提高采收率及关键工艺技术研究”(KJGG2022-0602)。
