内外压检测对套管连接处密封性能的影响

Effect of Internal and External Pressure Detection on Sealing Performance of Casing Joint

内压检测装置在实际应用中存在操作不便和不适用于小管径套管等缺点,为此研究了外压检测方法。采用锥面-锥面的螺纹密封形式来建立密封模型,利用有限元软件分别仿真内压检测和外压检测2种方法检测套管与接箍密封过程。仿真结果表明:2种检测方式都会增大套管和接箍的Mises应力;内压检测最大Mises应力在主密封面处,而外压检测最大Mises应力在扭矩台肩处;外压检测方法相较于现阶段使用的内压检测方法,对套管接箍连接的密封影响较小且在接受的范围内。最后指出采用外压检测方法对于套管接箍连接的密封进行检测可行。

The internal pressure detection device showed disadvantages of inconvenient operation and not applicable to small diameter casing in practical application. To address the issue,the external pressure detection method has been studied. The sealing model was established by using the conical surface-conical surface thread sealing pattern. The finite element software was used to simulate the casing-joint seal detection process by internal pressure detection and external pressure detection method. The simulation results showed that: both detection methods will increase the Mises stress of casing and casing joint. The maximum Mises stress was showed at the main sealing surface by internal pressure detection,but at the torque shoulder by the external pressure detection. Compared with the internal pressure detection method used at the present,the external pressure detection method has little effect on the sealing of the casing joint and is within the accepted range. It is feasible to use the external pressure detection method to detect the casing joint sealing condition.