Bit type | IADC Code | Applicable formation | Main characteristics of the bit | Recommended parameters | |
Cutting structure | Normal WOB KN/mm(bit dia.) | Rotary Speed(rpm) | |||
THJS437 | 437 | Soft with low compressive strength and high drillability,such as shale,clay,sandstone,soft limestone,salt bed and gypsolyte,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,high compact exposure and inequable spaced compacts arrangement., And a row of trimmers is added between gage row and heel row. | 0.35-1.00 | 240-60 |
THJS447G | 447 | Soft with low compressive strength and high drillabilty ,such as shale ,clay ,sandstone and soft limestone,salt bed and gypsolyte,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.00 | 240-60 |
THJS517G | 517 | Soft with low compressive strength and high drillabilty ,such as shale ,clay ,sandstone and soft limestone,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 240-50 |
THJS527G | 527 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,hard gypsolyte,soft limestone,sandstone and dolomite with strngers,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 240-50 |
THJS537G | 537 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,mudstone,soft limestone and sandstone,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole.. | 0.35-1.05 | 220-40 |
THJS547G | 547 | Medium soft with low compressive strength and thick &hard stringers,such as limestone,hard shale,mudstone and sandstone,etc. | Large radius scoop compacts in inner row,wedge compacts in outer row,, ,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 220-40 |
Bit type | IADC Code | Applicable formation | Main characteristics of the bit | Recommended parameters | |
Cutting structure | Normal WOB KN/mm(bit dia.) | Rotary Speed(rpm) | |||
THJS437 | 437 | Soft with low compressive strength and high drillability,such as shale,clay,sandstone,soft limestone,salt bed and gypsolyte,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,high compact exposure and inequable spaced compacts arrangement., And a row of trimmers is added between gage row and heel row. | 0.35-1.00 | 240-60 |
THJS447G | 447 | Soft with low compressive strength and high drillabilty ,such as shale ,clay ,sandstone and soft limestone,salt bed and gypsolyte,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.00 | 240-60 |
THJS517G | 517 | Soft with low compressive strength and high drillabilty ,such as shale ,clay ,sandstone and soft limestone,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 240-50 |
THJS527G | 527 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,hard gypsolyte,soft limestone,sandstone and dolomite with strngers,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 240-50 |
THJS537G | 537 | Medium soft with low compressive strength and harder abrasive stringers,such as hard shale,mudstone,soft limestone and sandstone,etc. | Large radius offset crested scoop compacts in inner row,wedge compacts in outer row,,high compact exposure,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole.. | 0.35-1.05 | 220-40 |
THJS547G | 547 | Medium soft with low compressive strength and thick &hard stringers,such as limestone,hard shale,mudstone and sandstone,etc. | Large radius scoop compacts in inner row,wedge compacts in outer row,, ,inequable spaced compacts arrangement,and with the cutting structure of primary and secondary cutters with double bresking lines on bottom hole. | 0.35-1.05 | 220-40 |
