水龙头高压盘根密封失效分析与结构改进

盘根密封是水龙头的关键环节，其性能直接影响水龙头的寿命和钻井速度。通过对国民油井公司的一种高压水龙头与现有水龙头密封结构的对比，综合分析了密封的破坏原因。按其工作原理，利用ANSYS有限元工程分析软件分析了密封圈接触压力，指出了采用高压润滑油隔离泥浆的合理依据。针对目前国内水龙头在高压下密封寿命极短这一问题，提出了改进措施与方法，对于国内高压水龙头设计具有一定的参考价值。

The Failure Analysis and Improvement for High Pressure Seal Packing Swivel

Swivel packing seal assembly is the key of the swivel, whose function directly influ-ences its service life, further more, and affects the drilling speed. In contrast between the tradi-tional rotary swivel and National Oilwell high pressure swivel, the paper comprehensively analy-ses the seal destruction factors. According to operating pribramite,utilizing the engineering analy-sis finite element software ANSYS,in analyzes seal ring cabagin ressure, and points out the rea-sonable foundation of isolation system of high pressure lubricating oil holding back mud. Aiming at the short life of the domestic swivel under high pressure, it puts forward the improvement methods, which have certain reference value for the design of high pressure swivel.