Open Bearing Steel Tooth Bit
Cutting Structure
The durability of premium tungsten carbide insert is improved with new formulas and new techniques and new techniques. The wear-resistance of teeth is enhanced with premium tungsten carbide hardfacing on the tooth surfaces.
Bearing Structure
Non-sealed roller bearing. Drilling fluid can enter the bearing directly for cooling; Balls lock the cone which reduces the probability of cone ropping to minimum.
Product Application
It is suitable for the shallow well, water well and geothermal well.
Recommended Drilling Parameter
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IADC
|
WOB
(KN/mm)
|
RPM
(r/min)
|
Applicable Formations
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|
|
111
|
0.3~0.75
|
200~80
|
Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, etc.
|
|
|
121
|
0.3~0.85
|
200~80
|
Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft limestone, etc.
|
|
|
131
|
0.3~0.95
|
180~80
|
Soft to medium formations with low compressive strength and high drillability, such as medium soft shale, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc.
|
|
|
211
|
0.35~0.95
|
180~80
|
Medium formations with high compress strength, such as medium soft shale, hard gypsum , medium soft limestone, medium soft sandstone, soft formation with harder interbed, etc.
|
|
|
241
|
0.35~0.95
|
180~70
|
Medium hard formations with high compressive strength, such as abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble,etc
|
|
|
321
|
0.4~1.0
|
150~70
|
Hard semi-abrasive formations, such as abrasive shale,limestone,sand stone,dolomite,hard gypsum,marble,etc.
|
|
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Note: The upper limits of WOB and RPM in above table should not be used simultaneously.
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