METHOD OF PROTECTING A TOP DRIVE DRILLING ASSEMBLY AND A TOP DRIVE DRILLING ASSEMBLY MODIFIED IN ACCORDANCE WITH THIS METHOD

摘要

A method of protecting a top drive drilling assembly includes incorporating a shock absorbing sub incorporated in the top drive drilling assembly. The shock absorbing sub comprises a first body and a second body capable of relative axial movement, with a shock absorbing medium disposed between the first body and the second body to absorb any reactive axial force exerted upon the top drive drilling assembly.