28-iadc617-tricone-bit

28-iadc617-tricone-bit

28” IADC617 Tricone Bit 

The 28-inch (711.2mm) IADC617 Tricone Bit is a high-performance rotary drilling tool engineered for use in the oil and gas, mining, and geothermal industries. Designed to meet the demanding requirements of medium-soft to moderately hard rock formations, this bit features advanced engineering, rugged construction, and optimized cutting capabilities. With a robust structure and superior wear resistance, it ensures high drilling efficiency and extended service life even in the most abrasive downhole environments.

Type and Design Specification

This bit is classified under the IADC617 designation according to the International Association of Drilling Contractors (IADC) code system. This classification indicates a medium to medium-hard formation bit with tooth-type cutting structures, specifically designed for formations with interbedded soft and hard rock layers. The IADC617 bit is particularly suited for formations such as hard shale, hard gypsolyte, soft limestone, sandstone, and dolomite with stringers.

The IADC617 Tricone Bit incorporates tungsten carbide inserts (TCI), known for their exceptional durability and penetration capabilities in medium-hard to hard formations. These inserts are precision-placed to maximize rock fragmentation, reduce torque fluctuation, and maintain consistent performance during prolonged drilling operations.

Bearing Type

The bit features a rubber-sealed journal bearing system, which is a key component for operational longevity and smooth rotation. The rubber seal effectively isolates the internal lubrication system from external contaminants such as cuttings, debris, and drilling fluids. This bearing type offers superior resistance to wear, heat, and pressure, ensuring the tricone bit operates efficiently under high loads and varying downhole conditions.

Thread Connection

The thread type is a 7 5/8″ API Reg pin, a common standard in the drilling industry that ensures compatibility with a wide range of drill strings and bottom hole assemblies (BHAs). The robust thread design contributes to the bit’s structural integrity during high-torque operations, reducing the risk of thread failure and facilitating safe and secure tool connections.

Gauge Protection

The bit is equipped with comprehensive gauge protection, a critical feature for maintaining hole diameter and preventing under-gauge drilling. This protection typically includes gauge row inserts and hardfacing materials that shield the outer diameter of the bit from abrasive wear. Effective gauge protection not only preserves bit life but also ensures a smoother wellbore, reducing the risk of deviation and improving directional control.

Operational Parameters

The 28” IADC617 Tricone Bit is engineered to perform within specific weight-on-bit (WOB) and rotational speed parameters. The recommended WOB range is 0.35 to 1.05 KN/mm, and the optimal rotary speed (RPM) ranges from 110 to 40 r/min. These operational guidelines ensure efficient cutting action while minimizing the risk of bit damage or premature wear.

Application Formations

This tricone bit is optimized for medium soft formations with low compressive strength, interspersed with harder, more abrasive layers. It is ideal for drilling in complex lithologies that may include:

• Hard shale

• Hard gypsolyte

• Soft limestone

• Sandstone

• Dolomite with stringers

Its design allows for effective penetration of softer materials while resisting wear from harder, abrasive inclusions. The balanced cutting structure and rugged construction make it an excellent choice for operations requiring both efficiency and durability across varying geological conditions.

Weight and Compliance

Weighing in at approximately 800 kg, the bit is substantial enough to provide the necessary force and stability during drilling, contributing to a controlled and efficient borehole advancement. Additionally, this tricone bit conforms to SY/T5164, a recognized Chinese industrial standard for tricone bit manufacturing. Compliance with this standard ensures consistent quality, dimensional accuracy, and mechanical performance.

Conclusion

In summary, the 28” IADC617 Tricone Bit is a heavy-duty, field-proven drilling solution tailored for challenging formations. With its durable rubber-sealed bearings, high-quality TCI cutting structure, and robust gauge protection, it delivers reliable performance and extended bit life. Designed for use in medium-soft to hard interbedded formations, it meets industry expectations for durability, precision, and efficiency—making it a preferred choice for demanding drilling projects.