Parameter Range Bit size, in 6.0-36.0 Total nozzle area of the bit, [in.sup.2] 0.331-3.142 Depth the bit was pulled, ft 61-15,235 Drilled interval length, ft 4.0-3379.9 Rate of penetration, ft/hr 1.1-286.1 Minimum WOB, 1000 lbs 1-55,000 Maximum WOB, 1000 lbs 1-85,000 Minimum RPM, rev/min 10-286 Maximum RPM, rev/min 23-343 Mud circulation rate, gal/min 102-3300 The
roller bit type (IADC code) 111-647 Table 2: Parameter range for ROP data set.