方钻杆旋塞阀故障树的建立和分析

Establishment and analysis of failure tree for kelly cock

结合油田井控手册编写工作和在油田现场的调研与工作的实际经验,结合旋塞阀的故障模式分析,建立了方钻杆旋塞阀的失效故障树。对旋塞阀失效故障树进行定性和定量分析,求出了故障树的最小割集和结构重要度,确定了旋塞阀的主要失效因素:材料的性能、密封问题、操作问题、检验和维护保养等,提出规范操作、优化旋塞阀结构、提高各零部件的配合精度、增强旋塞阀关键零部件的强度及耐腐蚀性、制定统一的检验维护标准和研制自平衡旋塞阀等改进措施,对预防和减少方钻杆旋塞阀使用中存在的问题,优化旋塞阀结构有重要的参考价值。

Based on the knowledge of well control handbook composed,the experience of Tarim Oil Filed oil-field working for half a year and the collection of information home and abroad,the Fault Tree of Kelly Cock was established. Qualitative analysis was performed,the minimal cut sets and importance degree were worked out,the failure facts were revealed,which were material capability,seal ability,operation problem,examination and maintenance ,etc. Innovative approach were proposed,which were standardization operation,structure optimization,decreasing the allowance of each components ,improving strength and inoxidizability, making examination and maintenance criterion, developing self-balancing cock. These offered the references to prevention the Kelly cock problem and the optimal design of the Kelly cock structure.