Analysis of the Effect of Whirl on Drillstring Fatigue

Table 2

Parameters of drilling tool assembly.

Drill parameters	Drill tool assembly
	Example 1 (length: 7294 m)	Example 2 (length: 6461 m)
Drill pipe 1	127 mm DP × 3335 m	139.7 mm DP × 3119 m
Drill pipe 2	101.6 mm DP × 3500 m	127 mm DP × 3000 m
HWDP	127 mm HWDP × 135 m	127 mm HWDP × 135 m
Drill collar 1	139.7 mm DC × 324 m	177.8 mm DC × 153 m
Drill collar 2		203.2 mm DC × 54 m
Drill bit	190.5 mm	269.9 mm
WOB	60–160 kN	60–160 kN
RPM	40–150 rpm	40–150 rpm
Drilling fluid density	1.65 g/cm^3	1.35 g/cm^3