Bit type | IADC Code | Applicable formation | Main characteristics of the bit | Recommended parameters | |
Cutting structure | Normal WOB KN/mm(bit dia.) | Rotary Speed(rpm) | |||
THAT116 | 116 | Very soft with low compressive strength and high drillability.such as soft shale.clay and salt bed,etc. | Hardfaced tooth surface and the gage,high compact exposure,and a row of trimmers is added between gage row and heel row. | 0.50-1.20 | 100-50 |
THAT117 | 117 | Hardfaced tooth surface and the gage,high compact exposure,with gage compacts,and a row of trimmers is added between gage and heel row. | 0.35-0.90 | 140-70 | |
THAT126 | 126 | Very soft with low compressive strength and high drillability.such as soft shale.clay and salt bed and soft limestone,etc. | Hardfaced tooth surface and the gage,high compact exposure,and a row of trimmers is added between gage row and heel row. | 0.35-1.00 | 140-60 |
THAT127 | 127 | Hardfaced tooth surface and the gage,high compact exposure,with gage compacts,and a row of trimmers is added between gage and heel row. | 0.35-1.05 | 120-50 | |
THAT136 | 136 | Soft to medium soft with low compressive strength or soft with harder stringers,such as hard gypsolyte,soft limestone and sandstone,etc | Hardfaced tooth surface and gage,and a row of trimmers is added between gage row and heel row | 0.35-1.05 | 120-60 |
THAT137 | 137 | Hardfaced tooth surface and gage,high compact exposure,with gage compacts,and a row trimmers is added between gage row and heel row | |||
THAT216 | 216 | Medium hard with relatively higher compressive strength and thard stringers,such as hard gypsolyte,soft limestone and.sandstone etc. | Hardfaced gage,and all tooth surfaces,and a row of trimmers is added between gage row and heel row | 0.50-1.20 | 100-50 |
THAT217 | 217 | Hardfaced gage,and all tooth surfaces the gage fitted with compacts for enhanced gage protection,,and a row of trimmers is added between gage row and heel row | 0.50-1.20 | 100-50 | |
