基于ABAQUS的特殊螺纹接头优选

Optimization of Special Threaded Joint Based on ABAQUS

为解决油气井生产作业过程中油管螺纹接头发生断裂和密封失效等问题,通过数值模拟和新的气密封评价方法研究了两种螺纹接头在上扣、轴向拉伸、轴向压缩工况下的连接强度以及复合载荷工况下的密封性能。结果表明:接头上扣后,B型螺纹接头连接可靠性更高;在极限载荷1200 kN拉伸和压缩载荷下,两种螺纹接头应力分布差异较小,但部分螺纹接触面发生了明显的应力集中现象;两种螺纹接头的全螺纹长、半螺纹长以及密封面与台肩处的气体密封性能存在差异,二者全螺纹段都具有良好的密封性能,能满足密封要求,但密封面和台肩处存在泄漏风险,会影响油管接头的安全使用。B型螺纹接头连接强度和密封性能优于A型螺纹接头,在实际生产中更加安全可靠。

In order to solve the problems of fracture and seal failure of tubing threaded joints in the production and operation of oil and gas wells,the connection strength and sealing performance of two kinds of threaded joints under make-up,axial tension and axial compression conditions and composite load conditions were studied through numerical simulation and new gas seal evaluation method.The results show that the connection reliability of type B threaded joint is higher after the joint is screwed up.Under the ultimate load of 1200 kN tension and compression,the difference of stress distribution between the two kinds of threaded joints is small,but obvious stress concentration occurs on some thread contact surfaces.The full thread length,half thread length and gas sealing performance at the sealing surface and shoulder of the two threaded joints are different.Both full thread sections have good sealing performance and can meet the sealing requirements,but there is a risk of leakage at the sealing surface and shoulder,which will affect the safe use of tubing joints.It is concluded that the connection strength and sealing performance of type B threaded joint are better than that of type A threaded joint,which is more safe and reliable in actual production.