Advantages and disadvantages of PDC drill bits

 The PDC compact, commonly referred to as Polycrystalline Diamond Compact (PDC), stands as a prominent choice in geological and oil drilling operations due to its exceptional resistance to abrasion and impact.
In the realm of industrial application, the PDC composite sheet represents a novel class of materials synthesized under ultra-high-pressure and high-temperature conditions. It is formed by sintering diamond micropowder with a cemented carbide substrate, resulting in a composite super-hard material. Combining the high hardness, wear resistance, and thermal conductivity of diamond with the strength and impact toughness of cemented carbide, it emerges as a superior option for cutting and wear-resistant tools across various sectors such as metalworking, wood processing, and oil and gas drilling.
Particularly in geological, coal field, and oil and gas drilling, PDC composite piece drill bits have gained prominence for their commendable rock-cutting speed and prolonged operational lifespan.
Delving into the advantages of PDC drill bits:
1. Optimized Design: Incorporating a force balance design, these drill bits demonstrate superior guidance, especially suitable for downhole motor applications in directional drilling, with reduced radial vibration.
2. Enhanced Performance: Through a patented arrangement of PDC composite pieces with diverse structures across different sections of the bit, these drill bits exhibit heightened aggressiveness and resistance to abrasion.
3. Increased Drilling Speed: The design emphasizing strong aggressiveness facilitates high mechanical drilling speed.
4. Enhanced Efficiency: Compared to conventional alloy drill bits, PDC drill bits boast a drilling capacity in rock formations that is 10-30 times higher, significantly improving operational efficiency.
5. Extended Lifespan: The utilization of cast tungsten carbide and diamond composite pieces endows PDC drill bits with a longer operational lifespan and increased value.
However, despite their merits, PDC drill bits are not devoid of limitations:
1. Thermal Stress: The substantial difference in the coefficient of linear expansion between polycrystalline diamond and cemented carbide leads to poor thermodynamic compatibility, resulting in significant residual thermal stresses. This disparity often culminates in the delamination of diamond and cemented carbide.
2. Surface Characteristics: The predominantly flat surface of PDC drill bits necessitates polishing treatments to minimize chip adhesion and improve surface finish. However, such treatments incur high costs and yield marginal anti-adhesive effects.
3. Wear and Tear: As the working edge of PDC drill bits undergoes continuous wear, the surface tends to form a plane or arc, significantly increasing the contact area with the rock. Consequently, the pressure exerted on the rock decreases, leading to diminished rock-breaking speed and accelerated wear. Particularly in the context of deep or ultra-deep well drilling, frequent bit replacements escalate drilling cycle durations and associated costs.
The PDC composite pieces developed and manufactured by Somebetter exhibit superior pressure resistance, exceptional rock-breaking capabilities, and remarkable resistance to abrasion and impact. Leveraging cutting-edge synthetic technologies, these pieces offer an extended service life, heightened resistance to aggression, and enhanced resilience to high temperatures. Moreover, they maintain their original characteristics effectively in high-temperature environments, thus significantly enhancing operational efficiency for customers engaged in drilling operations.
Somebette PDC composites are developed to meet the needs of drilling in more complex formations, and are mainly suitable for oil and gas drilling under severe geological conditions.

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