8-1-2-165-1mm-pdc-bit

Product Description: 8 1/2″ Diamond Drill Bit / PDC Well Drilling Bit

The 8 1/2″ Diamond Drill Bit / PDC Well Drilling Bit is a high-performance, steel-body drilling tool engineered for efficient operations in soft formations. Built with a 165.1 mm (8 1/2 inch) diameter, this bit features a five-blade design and precision-engineered polycrystalline diamond compact (PDC) cutters. It is ideal for applications in oil, gas, water, and geothermal well drilling, where formation characteristics require enhanced cleaning, smooth cutting, and durability.

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Basic Specifications

• Product Name: 8 1/2″ Diamond Drill Bit / PDC Well Drilling Bit

• Diameter: 165.1 mm

• Blade Number: 5

• Body Type: Steel Body

• Number of Nozzles: 5

• Primary Cutter Size: 1613 (16 mm diameter, 13 mm height)

• Connection Thread: 4 1/2″ API Reg Pin

The 165.1 mm diameter makes this bit a standard choice for intermediate drilling sections. The five-blade design offers an optimal balance between durability and penetration rate. The steel body provides excellent impact resistance and structural strength, which enhances the bit’s performance in variable downhole conditions. The inclusion of five hydraulic nozzles ensures efficient cleaning and cooling, reducing the risk of cuttings accumulation and bit balling.

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Cutter Design and Performance

The 1613 PDC cutters—with a 16 mm diameter and 13 mm height—are known for their superior hardness, thermal stability, and wear resistance. These characteristics make them ideal for cutting through soft and sticky formations while maintaining a consistent rate of penetration. The layout of the cutters across five blades maximizes coverage and cutting efficiency, allowing the bit to maintain smooth rotation and reduce vibrations during drilling.

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Operating Parameters

• Rotational Speed (RPM): 60–260 revolutions per minute

• Weight on Bit (WOB): 30–120 kN/mm

• Maximum WOB: 150 kN

• Flow Rate: 26–56 liters per second

These parameters give operators a wide range of flexibility depending on rig capabilities and formation conditions. A moderate RPM and careful weight management are key to maximizing the bit’s lifespan while ensuring consistent cutting. Exceeding the recommended WOB or RPM simultaneously can cause premature wear or cutter damage, so maintaining balance within the guidelines is critical.

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Recommended Formations

This drill bit is engineered for soft formations with sticky, low-compressive-strength layers, including:

• Clay – Highly plastic and sticky, requiring good hydraulic cleaning.

• Marl – A mix of clay and calcium carbonate, often laminated.

• Lignite – A soft, moisture-rich form of coal that can be abrasive and sticky.

• Shale – Especially soft and flaky types that benefit from sharp cutters.

• Sandstone – When soft or poorly consolidated, sandstone presents little resistance but may clog cutters.

The combination of sharp PDC cutters and efficient fluid flow ensures that these formations are cut smoothly and transported away from the bit quickly, minimizing operational disruptions.

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Key Advantages

1. Optimized Blade Design: The five-blade configuration supports effective cutter distribution, ensuring thorough contact with the formation and enhancing cutting speed.

2. Steel Body Strength: The robust body structure provides resistance to impact and torque, enhancing stability and enabling reuse under proper conditions.

3. Superior Hydraulics: With five strategically placed nozzles, this bit delivers excellent flow dynamics for cooling, cleaning, and cuttings evacuation.

4. Long Service Life: The durable 1613 PDC cutters extend operational life in soft and abrasive environments, reducing the need for frequent bit changes.

5. Versatile Application: Suitable for various soft formations encountered in onshore and offshore drilling projects.

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Conclusion

The 8 1/2″ Diamond Drill Bit / PDC Well Drilling Bit is an efficient, long-lasting solution for drilling through soft and sticky formations. Its five-blade, steel-body design and large PDC cutters deliver optimal performance while maintaining bit integrity and reducing drilling costs. With wide operational flexibility and excellent formation compatibility, this bit is a reliable choice for drilling professionals aiming for high performance and operational efficiency in soft geological conditions.