The full-length paper analyzes bit stick/slip motion by coupling rock mecha
nics with field bottomhole data collected by use of an instrumented polycry
stalline-diamond-compact (PDC) bit, a new tool that measures acceleration,
weight on bit (WOB), and torque on bit (TOB) directly above the bit, Tests
were conducted in Montrose, Scotland at approximately 700 m in a consolidat
ed Devonian sandstone. The effect of stick/slip on rate of penetration (ROP
) was quantified, Generally, an increase in WOE makes the system move towar
d stick/slip mode.