AST type	cd	xc	xt	xw	tt
FEATURES:
High DLS capacity	x
Extra spring capacity	x	x	x	x	x
Pressure balanced		x	x	x
200C/392F capacity	x	x		x	x
220C/425F capacity	x		x
Option for wired pipe				x
APPLICATIONS
Exploration		x	x	x
Deviated		x		x
Lateral	x	x		x
Coring/Milling	x	x		x
Intervention					x

	Anti Stick-Slip Technology	Shock-tool (Axial)	Shock-tool (Lateral)	Bumper Sub	Drillstring vibrator	Surface toque controllers	MWD sensor- subs
Product Examples	AST	Cougar ST5	HI-Tool™	Bumper-Sub	Agitator ™, XPS™	Soft-Torque™	Co-Pilot™ DrillDoc™ Black-box™ (memory only)
Main scope/function	Prevents cutter induced stick-slip	Absorbs axial shocks	Flexes sideways	Keeps bit on bottom	Breaks friction by continuous axial vibration	Breaks up self- exited torsional harmonics	Provides data for parameter optimization
Vibration mitigation axis	Axial and rotation	Axial	Lateral	Axial	Rotation	Rotation	N/A
Active or passive interaction	Active	Passive	Passive	Passive	Active	Active	N/A
APPLICATIONS
PDC	x	x	x	x	x	x	x
Roller Cone	x	x	x	x	x	x	x
Under-Reamer	x			x			x
Rig Heave	x			x
Performance	x		x			x	x
Intervention	x	x			x		x