可溶球座密封环密封性能分析与结构优化

可溶球座压裂后无需钻除作业，可自行溶解而实现井眼全通径，已成为致密油气水平井分段体积压裂的关键工具。可溶球座密封环的密封性能决定着水平井压裂作业的成败，因此开展了密封环密封性能的仿真分析及其结构优化研究。分析了可溶球座密封环的工作原理，运用有限元仿真方法分析了其密封性能。结果表明，坐封完成后密封环所受最大应力达到182.26 MPa，存在局部破坏的风险。进行了密封环材料和结构的优化设计，分析了各结构参数对密封性能的影响。优化后可溶球座能在50 kN坐封力的作用下安全坐封，密封环与套管内壁和滑动体的最大接触应力均大于压裂液压力，且接触应力分布较为均匀，满足密封要求。密封环结构优化后，可溶球座的密封和安全性能得到了提高。研究结果可为可溶球座密封环结构的改进提供参考。

Sealing performance analysis and structure optimization of sealing ring of soluble ball seat

After fracturing, the soluble ball seat does not need drilling operation, and can dissolve itself to achieve full bore. Therefore, it has become a key tool for horizontal well piecewise volume fracturing. The sealing performance of sealing ring of soluble ball seat determines the success or failure of horizontal well fracturing operation. Therefore, the simulation analysis of sealing performance and structural optimization of sealing ring were carried out. The working principle of sealing ring of soluble ball seat was analyzed, and its sealing performance was analyzed by finite element simulation method. The results showed that the maximum stress of the sealing ring reached 182.26 MPa after setting, which made it at risk of local damage. The material and structure of sealing ring were optimized, and the effects of structural parameters on sealing performance were analyzed. After optimization, the soluble ball seat could be set safely under the action of 50 kN setting force. The maximum contact stress between the sealing ring and the inner wall of sleeve, sliding body was greater than the fracturing fluid pressure, and the contact stress distribution was relatively uniform, meeting the sealing requirements. After the optimization of the sealing ring structure, the sealing and safety performance of the soluble ball seat have been improved. The research results can provide reference for the improvement of the structure of sealing ring of soluble ball seat.