超深水钻井作业隔水管顶张力确定方法

Determination methods for the top tension of ultradeepwater drilling risers

对于深水和超深水钻井作业,确定钻井隔水管系统顶张力是钻前设计非常重要的工作。研究三种隔水管系统顶张力确定方法,分别是理论方法、基于隔水管系统底部残余张力方法和基于下放隔水管系统的最大钩载方法。算例计算与超深水钻井实践对比表明,在相同的隔水管系统配置下,三种方法计算结果都接近于实际钻井作业时的顶张力设定值。但研究认为,基于下放最大钩载的顶张力计算方法简单实用,推荐作为优选方法。

In deepwater and ultradeepwater drilling operation,the determination of top tension of drilling riser system for pre-spud design is the main consideration.Three determination methods of top tension of drilling riser system are proposed,which are theoritical method,method based on the residual tension at bottom of the drilling riser system,and method based on the maximal hook load during the running procedure of the drilling riser system respectively.An example is presented and its results by different methods are compared with the ultradeepwater drilling practice,which illustrates that all the values by different methods fit well with the pre-defined value of the top tension in the actual drilling operation in case of the identical drilling riser configuration.The research indicates that the method based on the maximal hook load during the running procedure of the drilling riser system is simple and applicable,which is recommended as the preferred method for determination of the top tension.