Field Case Study: 98 Flat-Top Drill Bit

Average service life of around 880 m in f=3-11 mixed formations; over 1,800 m life in coal seam drilling

Used with ZDY1250 equipment in inclined-shaft drilling, the bit is designed for coal seams, gangue, limestone, and variable mixed strata requiring stable footage, cutter retention, and reliable wear resistance.

Before Us	After Field Us
Unused bit: complete flat-top cutting layout, PDC cutter arrangement, and flushing/cuttings channels.	After field use: the body and cutting structure remain stable; PDC cutters stay firmly bonded with controlled wear.

1. Working Conditions & Drilling Parameters

2. Performance After Field Use

•  Fast drilling in coal seams, with bit life generally above 1,800 m.
•  Average service life reaches around 880 m across complex mixed formations.
•  The flat-top matrix body maintains stable support under changing strata and fractured conditions.
•  PDC cutters remain firmly bonded to the bit body, with no obvious loosening or detachment.
• Controlled wear after use supports continuous drilling and predictable replacement planning.

3. Core Advantages

•  Wide formation adaptability: suitable for coal seams, gangue, limestone, and f=3-11 mixed strata.
•  High-strength matrix design improves wear resistance and impact resistance in variable rock layers.
•  Reliable PDC cutter bonding reduces cutter-loss risk and abnormal failure during drilling.
•  Flat-top structure supports stable cutting coverage and smoother cuttings discharge.
• Helps reduce bit replacement frequency and improve overall drilling continuity on site.

4. Summary

In f=3-11 mixed formations including coal seam, gangue, limestone, and hard nodules, the 98 flat-top matrix drill bit demonstrates strong formation adaptability, stable wear resistance, and reliable PDC cutter bonding. With a typical average life of around 880 m and coal seam drilling life generally above 1,800 m, it is a practical solution for improving drilling continuity and reducing unplanned bit changes in underground borehole operations.