全金属可溶桥塞密封环密封性能研究

Study on sealing performance of sealing ring for all-metal soluble bridge plug

针对一种新型全金属可溶桥塞密封环密封不严、导致桥塞整体承压性能未达到设计指标的问题,开展了密封环密封性能仿真分析、尺寸优化及实验验证。利用有限元分析软件建立了锥体、密封环、辅助环和套管模型,对密封工况下密封环性能进行分析,得出桥塞承压未达到预期的直接原因是密封环与套管最大接触应力较低、密封效果差。为提高密封环密封效果及桥塞整体承压性能,对密封环结构尺寸进行优化,并以优化后密封环尺寸为基础,开展了桥塞样机承压室内实验,结果表明,桥塞承压在80MPa以下无渗漏,密封效果好,满足承压指标要求。该研究可为后续金属可溶桥塞密封环的结构设计及优化改进提供参考。

Due to some new types of sealing ring for all-metal soluble bridge plug are not tight,leading to the overall pressure bearing performance of the plug not qualified to meet the design requirement,the simulation analysis,size optimization and experimental verification of the sealing performance of the sealing ring have been carried out.The models of cone,sealing ring,auxiliary ring and casing were established by using the finite element analysis software to analyze the performance of sealing ring under the sealing condition.It was found that the direct reason for the failure of the bridge plug to meet the expected pressure was that the maximum contact stress between the sealing ring and the casing was low with poor sealing effect.In order to improve the sealing effect of the sealing ring and the overall pressure bearing capacity of the bridge plug,the structural dimension of the sealing ring was optimized,and the indoor pressure experiment of the bridge plug prototype was carried out based on the optimized size of sealing ring.The results showed that bridge plug had no leakage under 80 MPa with good sealing effect,and it cold meet the need of pressure bearing performance.The research can provide reference for the structural design and optimization of the sealing ring in the metal soluble bridge plug.