API 8 1/2 IADC steel tooth drill bit/used water well drilling bits

1. Steel Tooth Tricone Bit for Soft Formation

TYPE: G13 (IADC----131)
APPLICABLE FORMATION: Soft Formations with low compressive strength: Clay rock, Gypsum, Shale, soft Limestone, Salt.
HARDNESS OF ROCK: f<2
WEIGHT RECOMMEND: 20-35kg/mm (Dia Bit) (1100-2000 lb/in)
ROTARY SPEED: 80-150rpm.


2. Steel Tooth Tricone Bit for Medium Formation

TYPE: G23 (IADC----241)
APPLICABLE FORMATION: Hard Sandstone, hard Shale, hard Gypsum, and soft Limestone with low compressive strength
HARDNESS OF ROCK: f<2
WEIGHT RECOMMEND: 20-63kg/mm (Dia Bit) (1100-3500 lb/in)
ROTARY SPEED: 70-80rpm.


3. Steel Tooth Bit for Hard Formation

TYPE: G33 (IADC----311)
APPLICABLE FORMATION: Hard sandstone, Granite, Quartzite, abrasive Shale with high compressive strength.
HARDNESS OF ROCK: f 5-8
WEIGHT RECOMMEND: 55-90kg/mm (Dia Bit) (3000-5000 lb/in)
ROTARY SPEED: 50-80rpm.


4. Steel Tooth Journal-sealed Bearings Bit for Hard Formation

TYPE: GHM33 (IADC-----311)
APPLICABLE FORMATION: Hard sandstone, Granite, Quartzite, abrasive Shale.
HARDNESS OF ROCK: f 3-6
WEIGHT RECOMMEND: 20-50kg/mm (Dia Bit) (1100-2800 lb/in)
ROTARY SPEED: 40-60rpm.  


Part 3.Payment

IADC	Recommended Parameter		Formation
	WOB KN/mm (bit dia.)	RPM(r/min)
114\115	0.3~0.75	180~50	Very soft with low compressive strength and high drillability,such as clay,mudstone,chalk,etc.
116\117	0.3~0.8	150~70	Very soft with low compressive strength and high drillability,such as clay,mudstone,chalk,etc.
124\125	0.3~0.85	180~60	Soft with low compressive strength and high drillability,such as clay,mudstone,salt,loose stands,soft limestone,etc.
126\127	0.3~0.9	150~60	Soft with low compressive strength and high drillability,such as clay,mudstone,salt,loose stands,soft limestone,etc.
134\135	0.35~0.95	150~50	Soft to medium with low compressive strength or soft with harder streaks,such as shale,mudstone,soft limestone,sands,etc.
136\137	0.35~1.0	120~60	Soft to medium with low compressive strength or soft with harder streaks,such as shale,mudstone,soft limestone,sands,etc.
214\215	0.4~0.95	150~60	Medium hard with hard streaks and high compressive strength,such as medium soft shale,anhydrite,medium soft limestone,medium soft sandstone as well as thick and hard streaks,etc.
216\217	0.4~1.0	100~60	Medium hard with hard streaks and low compressive strength,such as medium soft shale,limestone and sandstone as well as thick and hard streaks,etc.
244	0.35~0.95	150~40	Medium hard with hard streaks and high compressive strength such as hard shale,sands,limestone,etc.
246\247	0.4~1.0	80~50	Medium hard with hard streaks and high compressive strength such as hard shale,sands,limestone,etc.
324\325	0.4~1.0	120~50	Hard with high strength and abrasiveness such as hard limestone,hard sands,dolomite,hard shale,etc.

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