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Views: 1 Author: Site Editor Publish Time: 2020-10-23 Origin: Site

STEEL MILLING TOOTH BITS

IADC 1 SERIES DRILL BITS
These bits are used to drill low-compressive strength, soft formations. Long projection tooth lengths are used on high offset cones to provide the greatest penetration rates possible. Wear-resistant hardfacing is used to control tooth wear. On the softest bit types this hardfacing completely covers the bit teeth.

IADC 2 SERIES DRILL BITS
These bits are used to drill high-compressive strength, medium hard formations. Short projection teeth with reduced crest length are used in this series of bit designs. Durable hardfacing is applied to reduce tooth wear.

IADC 3 SERIES DRILL BITS
These bits are used to drill hard and abrasive formations. Very short, closely spaced teeth with minimum amounts of hardfacing are used for breakage resistance. These bits must withstand high loads and drill abrasive formations with a crushing, cutting action.

IADC	Rock formation	WOB (KN/mm)	PRM(r/min)
116/117	Low compressive strength, high drill-ability and extremely soft formation, like soft shale, clay, salt rock, etc.	0.35~0.90	180~80
126/127	Low compressive strength, high drill-ability and soft formation, like shale, clay, salt rock and soft limestone, etc.	0.35~1.00	180~80
136/137	Soft to medium soft with low compressive strength or soft with hard interlayer, like anhydrite, soft limestone, sandstone, etc.	0.35~1.05	130~60
216/217	Medium hard formation with relatively high compressive strength and hard interlayer, like hard shale, sandstone. limestone, etc.	0.5~1.20	100~50

Bit Diameter		API PIN
(inch)	(mm)	API PIN
3 7/8"~5 1/4"	98~134	2 3/8", 2 7/8"
5 5/8"~6 3/4"	143~171	3 1/2"
7 1/2"~9 1/2"	190.5~241	4 1/2"
9 5/8"~13 3/4"	245~350	6 5/8"
14 5/8"~26"	371~660.4	7 5/8"

tricone bits Drill Bit

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