Patent ID: 7243735

Claim:
A method for a wellbore operation with a wellbore system, the method comprising acquiring with sensor systems data corresponding to a plurality of parameters, said data indicative of values for each parameter of said plurality of parameters, each parameter corresponding to part of the wellbore system, based on said data, calculating a mechanical specific energy value for each of a plurality of mechanical specific energies each related to a mechanical specific energy for a part of the wellbore system, monitoring the value of each of the mechanical specific energies, wherein the wellbore operation is an operation with a rotating bit and values for the mechanical specific energies are calculated according to the equation for Teale's definition of mechanical specific energy, ES, where Es = WOB A + 120 ⁢ ⁢ π ⁡ ( N ) ⁢ ( T ) A ⁡ ( ROP ) and wherein WOB is weight on bit, N is rpm's of a rig's rotary, T is torque at the bit, ROP is rate of penetration, and A is wellbore or bit cross-sectional area.