Surface Torque/Tension Measurements Used To Detect and Calculate Stick/Slip

A surface-based torque and tension sub (TTS) was used to perform measurements while drilling several extended-reach horizontal wells. A filtered version of surface torque was used to calculate a stick/slip metric, which was compared with stick/slip measurements from a downhole tool. The results show that there is reasonable correlation between surface and downhole metrics. A comparison was also made between hookload measured with a deadline sensor and tension measurement from the surface sub.