Drilling Parameter Optimization of Shale Gas Wells Based on Saw-Tooth Genetic Algorithm to Reduce Drilling Costs

Table 3

Optimal results of different bit wear.

Bit wear()	WOB/kN	Revolutions per minute/(r⋅min^-1)	/(yuan⋅m^-1)	Optimal numbers of convergence
0.75	305.00	85.0	79.8	75
0.80	305.00	85.0	79.0	65
0.90	310.68	95.0	77.8	70
1.00	313.47	102.3	77.0	72