塔河油田某生产井油管压溃失效分析  

Failure Analysis of Oil Tube Collapse in A Production Well in Tahe Oilfield

作　　者：罗辉[1] 桂晶 王毛毛 李金许[3] LUO Hui;GUI Jing;WANG Maomao;LI Jinxu(Northwest Oilfield Branch,SINOPEC,Urumqi 830011,China;Safetech Research Institute,Beijing 102209,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国石油化工股份有限公司西北油田分公司,新疆乌鲁木齐830011 [2]安科工程技术研究院(北京)有限公司,北京102209 [3]北京科技大学,北京100083

出　　处：《化工管理》2024年第24期145-149,共5页Chemical Management

摘　　要：塔河油田某生产井在酸化压裂+连续油管气举增产过程中,第414根油管发生压溃失效。通过对压溃油管的宏观形貌观察、壁厚测试、腐蚀产物表征以及压溃模拟计算,可以明确第414根油管发生压溃的原因为:连续油管气举过程中注入的氮气中伴随的氧以及酸化压裂过程中的酸液对压溃油管内壁的腐蚀,首先导致油管内壁减薄严重,当其壁厚减薄导致临界挤毁压力小于环空保护液导致的静水压时,油管发生压溃。文章建议后续类似工况生产井进行增产时,可对连续油管气举的注气气源进行优化,选择纯度为99.9%的氮气,同时优化酸化压裂工艺,延长酸压时间。The 414th oil tube collapsed and failed in a production well in Tahe Oilfield in the process of acid fracturing and coiled oil tubing gas lift increase production.With the macroscopic morphology observation,wall thickness test,corrosion product characterization and collapse simulation calculation of the collapsed oil tube,the reason for the 414th oil tube collapsed was that the oxygen in the nitrogen injected during the coiled oil tubing gas lift process and the acid fluid in the acid fracturing process corrode the inner wall of the collapsed oil tube,which first lead to serious thinning of the inner wall of the oil tube,when the critical collapse pressure caused by its wall thickness reduction was less than the hydrostatic pressure which caused by the annulus protection fluid,the tube collapsed.It is suggested that the gas injection source of coiled oil tubing gas lift could be optimized when the production wells increase production under similar working conditions in the future,nitrogen with purity of 99.9%should be selected.And the acid fracturing process could be optimized to extend the acid fracturing time.

关 键 词：生产井 油管 压溃 气举 失效分析 

分 类 号：TE983[石油与天然气工程—石油机械设备]