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

Table 5

Actual drilling parameters.

The serial number of bits	Running depth of well/m	Trip-out depth/m	Average bit pressure/kN	Average drilling rate/r·min^-1
5	683	886	250	65	0.65
8A	1056	1254	240	55	0.75
9B	1403	1480	240	55	0.60