深水采油树井口液压连接器的设计

Design of the Wellhead Hydraulic Connector for Deep-water X-tree

设计一种基于18-3/4"H4型面、69 MPa井口压力的液压驱动锁块式连接器,通过有限元方法分析锁紧型面过盈量对锁紧峰值压力、连接器预紧力的影响,预紧力与锁紧峰值压力之间的关系,以及VX钢圈在失效负载条件下的密封性能,并对相关分析结果进行测试验证。分析及测试验证表明,在过盈量可调范围内连接器预紧力与锁紧峰值压力为线性关系,可通过锁紧峰值压力的大小有效评估预紧力;有限元分析结果可为连接器的调试作参考;连续的环状接触压痕是钢圈密封的必要条件,密封面的材料及加工质量是建立密封的关键因素;连接器在69 MPa+1300 kN+11000 kN·m负载条件下功能、结构及密封性能良好。连接器搭载采油树在南海相关油气田得到成功的示范应用。

A hydraulic driven connector with locking segments based on 18-3/4"H4 profile,69 MPa wellhead pressure was designed.Using the FEA method,the influence of the locking profile interference on the locking hump pressure,the connector preload,the relationship between locking connector preload and hump pressure,and the VX gasket sealing performance under the failure load condition were analyzed,and the correlation analysis results were tested and verified.The analysis and test verification showed that the connector preload has a liner relationship with the locking hump pressure within the adjustable range of interference,and the preload can be effectively evaluated by the value of the locking hump pressure.The result of FEA can provide an effective reference for connector debugging;continuous annular contact indentation is a necessary condition for the sealing of the steel gasket.The material and processing quality of sealing surface are critical factors to establish the sealing.The connector has excellent function,structure and sealing performance under 69 MPa+1300 kN+11000 kN·m load conditions.The connector equipped with X-tree has been successfully demonstrated in the relevant oil/gas fields in the South China Sea.