Research on improvement of drilling efficiency by estimating a dynamic stress utilizing actual drilling data

在科学钻探船“地球号”上建立了钻探数据采集系统，以连续采集实际钻探数据。利用钻井数据，对钻杆实际承受的动应力进行了评估，并与理论应力进行了比较。此外，还对升沉补偿器的性能进行了评估，升沉补偿器是用于减轻船舶升沉运动向钻杆传播的设备。这些知识和钻井数据有助于进行强度评估和为Chikyu的实际钻井计划制定钻井标准。

Drilling data acquisition system was established onboard the scientific drilling vessel Chikyu to acquire the actual drilling data continuously. Utilizing the drilling data, evaluation of dynamic stress actually exerted on the drill pipe was examined, and consideration was conducted by comparing with the theoretical stress. In addition, evaluation of the performance of the heave compensator, which is equipment to mitigate the propagation of vessel heave motion to the drill pipe, was conducted. The knowledge and drilling data contribute to the strength evaluation and the drilling criteria plan for actual drilling programs of the Chikyu.