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适用于软硬交错地层，如软页岩、粘土、盐岩、石灰岩、硬石膏、砂岩、砾岩、白云岩、硬砂岩等
优点：热稳定性强，抗冲击能力较强。
TCI cone bit used in oil drilling, water well, coal field exploration and development of engineering applications，?apply to soft hard staggered formation, such as soft shale, clay, gypsum, limestone, gypsum, sandstone, conglomerate, dolomite, sandstone, etc?.
尺寸（size） 98mm-660.4mm (3 7/8 - 26 inch)
轴承（bearing） 橡胶和金属密封轴承
(rubber and metal sealed bearing type )
IADC code 117、127、137、217、247、417、437、517、537、617、637
适用地层（Application） 极软地层到硬地层，如粘土、泥岩、白垩、石膏、盐岩、页岩、石灰岩、砂岩、白云岩、大理石等有硬夹层的复杂地层.
Extremely soft ground to hard formations such as clay, mud?stone, chalk, gypsum, rock salt, shale, limestone, sandstone, dolomite, marble and other hard sandwich complex formation
Advantages: strong thermal stability, impact resistant ability is stronger.
Tricone drill bit Of Structural Features:
1,Cutting Structure:
The durability of premium tungsten carbide insert is improved with new formulas and new techniques for insert bit.
2,Gauge Structure:
IADC114-117
齿面、背锥硬面强化，齿出露高，背锥镶齿，低抗压强度、高可钻性的极软地层，如软页岩、粘土、盐岩等。
IADC126-127
齿面、背锥硬面强化，齿出露较高，背锥镶齿，低抗压强度、高可钻性的极软地层，如软页岩、粘土、盐岩、软石灰岩等。
IADC136-137
偏顶勺形内排齿，楔形外排齿，不等距布齿，低抗压强度、中软、有较硬研磨性夹层，如硬页岩、硬石膏、软石灰岩、沙岩、含夹层白云岩等。
IADC216-217
牙轮背锥面和牙全部表面进行硬面强化，且背锥用硬质合金齿加强保经，抗压强度较高的中等硬度，并有硬夹层、如硬页岩、砂岩、石灰岩
