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Insert Type 9 7/8 Inch Tricone Bits

Insert Type 9 7/8 Inch Tricone Bits

The biggest feature of the three-cone bit is that it is particularly strong in abrasion, and the drill speed is particularly fast, especially wear the drill bit and the cone back cone and the claw tip, so that make the drill bit diameter grinding small and bearing exposed, The grinding strata of the product will make the teeth wear off too much, the drill footage less, slow down the speed of the machine fast and speed up the damage of the drill bit, then the three teeth cone bit is the best choice.


The tricone bit is the most widely used drill bit. When the tricone bit is working, the cutting teeth are in contact with the bottom of the hole, the rock breaking torque is small, the contact area between the cutting tooth and the bottom hole is small, the pressure is high, and it is easy to get into the formation. The total working length is large and the wear is relatively reduced. The tricone bit can accommodate a variety of strata from soft to hard..


According to the number of roller the tricone bits can be divided into single tricone bit, three tricone bit and assembly of multi-tricone bit. According to the cutting material it can be divided into steel teeth (milling) and insert tooth drill bit.


IADC CODE SELECTION

IADC   WOB RPM Application
(KN/mm) (r/min)
111/114/115 0.3-0.75 200-80 very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
116/117 0.35-0.8 150-80 very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk
121 0.3-0.85 200-80 soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
124/125 180-60
131 0.3-0.95 180-80 soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
136/137 0.35-1.0 120-60
211/241 0.3-0.95 180-80 medium formations with high compressive strength, like medium, soft shake, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbeds.
216/217 0.4-1.0 100-60
246/247 0.4-1.0 80-50 medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
321 0.4-1.0 150-70 medium abrasive formations, like abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble
324 0.4-1.0 120-50
437/447/435 0.35-0.9 240-70 very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk, gypsum, salt, soft limestone
517/527/515 0.35-1.0 220-60 soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone
537/547/535 0.45-1.0 220-50 soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds
617/615 0.45-1.1 200-50 medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite
637/635 0.5-1.1 180-40 hard formation with high compressive strength, like limestone, sandstone, dolomite, hard gypsum, marble
Note: Above limitts of WOB and RRPM should not be used simultaneously
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