Field Case Study: φ113 Three-Wing Drag Bit

Stable structure after 400 m drilling in f=9 shale inclined-shaft conditions

Working Conditions

Mine type	Inclined shaft
Application	Underground drilling for gas drainage, water exploration, grouting and related boreholes
Bit model	φ113 three-wing drag bit
Equipment	ZDY3200
Cooling method	Water cooling

Formation and Drilling Parameters

Geological condition	Coal-seam application; shale; hardness f=9
Thrust force	12 kN
Rotation speed	80 r/min
Total drilling footage	400 m per bit
Product positioning	An efficient and economical bit for soft to medium-hard formations, including coal seams, mudstone and soft sandstone roadways

Performance After Field Use

After 400 m of accumuslated drilling, the bit maintained good overall structural integrity with no obvious structural failure.
The three-wing cutting profile remained clear, with wear mainly concentrated in the normal working contact area.
The flushing and chip-removal space remained identifiable, supporting fast slag discharge and reduced bit balling risk.
Under f=9 shale conditions, the bit demonstrated stable wear resistance, impact resistance and continuous drilling capability.
After field use, the PDC cutters remained firmly bonded to the bit body, with no obvious loosening or detachment, demonstrating stable and reliable bonding strength.

PDC Cutter Advantages

Firm bonding between the PDC cutters and the bit body helps reduce cutter-loss risk under high-load drilling.
Stable cutter arrangement helps maintain continuous cutting efficiency and drilling stability.
Controlled cutter-edge wear after field use reflects reliable material matching and bonding/welding process control.
Multiple PDC cutters work together to support efficient drilling in coal seams, mudstone, shale and soft sandstone formations.

Image Captions

Before Use	After Field Use

Unused φ113 three-wing drag bit, showing the original three-wing cutting structure, PDC cutter arrangement and central discharge space.	Our product after 400 m drilling in f=9 shale inclined-shaft conditions, showing stable structure, firm cutter bonding and controlled wear around the cutting area.

Key Advantages

High drilling efficiency: Suitable for common underground formations such as coal seams, mudstone, shale and soft sandstone.
Good slag discharge: The central structure supports chip removal and helps reduce bit balling.
Wear and impact resistance: Built for continuous drilling under demanding underground conditions.
Reliable PDC cutter bonding: No obvious loosening or detachment after field use; cutting units remained stable.
Lower overall operating cost: Helps reduce bit replacement frequency and improve on-site drilling continuity.

Summary

In f=9 shale inclined-shaft conditions, our φ113 three-wing drag bit achieved 400 m of accumulated drilling while maintaining good structural integrity, stable cutting performance and reliable PDC cutter bonding strength.

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