Q: What section of an oil well does the 8-1/2 inch PDC bit drill?
A: The 8-1/2 inch (215.9mm) PDC bit drills the intermediate and production sections of oil and gas wells, typically from 800m to 3,500m depth. This diameter accommodates 7 inch (177.8mm) production casing with cement. The 8-1/2 inch size is the most widely used bit diameter globally in onshore oil and gas drilling.
Q: What does 3-wing with double-row cutters mean?
A: The bit body has three main blades, each carrying two rows of PDC cutters: an inner row (closer to bit center) and an outer row (on the shoulder and gauge). This double-row arrangement provides 28-32 total cutters, which is comparable to a four-blade single-row design but with wider junk slots between blades. The three-blade layout with double rows combines the hydraulics of a 3 blades PDC drill bit (wider flow channels) with the cutter density of a four-blade bit.
Q: What connection does this bit use?
A: The 4-1/2 inch API REG pin thread connects to standard drill collars and heavy-weight drill pipe used in intermediate-section drilling. The 4-1/2 REG provides a tensile rating of approximately 1,200,000 lbs and torque rating of 48,000 ft-lbs, matching the loads encountered at 8-1/2 inch diameter in 2,000-3,500m depth ranges.
Q: What nozzle configuration is standard?
A: Three nozzle ports of 14mm diameter provide total flow area of 1.07 square inches. At 400-500 GPM flow rate, this delivers jet velocity of 350-450 ft/s at the bottom hole, sufficient for efficient cuttings removal in water-based or oil-based mud systems. Nozzle size can be adjusted by the customer before deployment.
Q: What ROP and bit life can I expect?
A: In medium-soft shale and sandstone (4,000-8,000 psi): ROP 15-25 m/hr, bit life 800-1,200m. In medium-hard limestone (8,000-12,000 psi): ROP 8-15 m/hr, bit life 500-800m. The double-row cutter arrangement provides a natural progression: when outer row cutters wear, inner row cutters maintain partial cutting efficiency, extending usable life by 20-30% compared to single-row designs.
Q: How does this 8-1/2 inch 3-wing double-row compare to a 4-wing design?
A: The 3-wing double-row has wider junk slots (32mm vs 24mm for 4-wing), providing better hydraulic cleaning in high-solids mud systems. The 4-wing has more uniform cutter distribution across the hole bottom, giving 5-10% higher ROP in homogeneous formations. In formations with sticky clay or high cuttings volume, the 3-wing double-row avoids bit balling more effectively and is the preferred choice.
Why did you choose us?
Zhengzhou Sungood New Material Technology Co., Ltd. has 15 years of professional experience in the production of mining machinery mining tools and accessories. Its main products include PDC cutting tools, PDC drill bits, diamond drill bits, etc. Our products are sold to multiple countries and regions, and we have established stable cooperative relationships with more than 20 customers worldwide.
Factory 8 1/2 Inch 4 1/2 REG 3 Blades PDC Drill Bit Oil Well Drill Bits Double-row PDC Cutters
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