12 3/8 in H1411D+ V7RPD Q12(314.325 mm)

Design Specifications

Total Inserts66
Gauge Inserts(14) 22mm
Face Inserts(23) 22mm, (23) 19mm
PD Inserts(6) 19mm
Nozzles3 - 1.38" Fixed Port
Junk Slot Area (sq in)7.4
Gauge Length4"
Bit ConnectionQ12 / QL120
Fishing Neck (in)10.63 x 4.5
Shipping Weight (lbs)450

Operating Parameters

Rotary Speed (RPM)20-30 RPM
Weight-on-Bit4,000 To 8,000 (lbs)
1,818 To 3,636 (daN)
2 To 4 (Tonnes)
Flow Rate (CFM)3000 To 6000
The operating parameters listed here are general parameters, please contact your local Smith Bits representative for precise recommendations for your individual well.



(Patent 8,387,725) The Gauge Plus engineered hammer bit advantage is achieved by strategically positioning a staggered adjacent to gauge (ATG) row cutting structure to augment the work capabilities of the primary gauge inserts. This differs from a standard percussion bit that uses a non-staggered gauge row configuration to cut a specific but independent portion of the sidewall and hole bottom with no work overlap. The ATG row on a Gauge Plus bit assists in cutting a portion of the outer hole helping to reduce the load on the primary gauge row inserts. This innovative new design enhances drilling efficiency by enabling the two rows to work in unison on the hole bottom rather than acting independently

Gauge Plus is designed with a precise amount of bottom hole coverage overlap between the ATG and primary gauge rows. This overlapping of insert coverage greatly enhances fracture propagation and communication because the impact points are in close proximity. Combined, the innovative combination of ATG inserts precisely located in the cutting structure increases chip generation improving the rock failure mechanism. The unique bottom hole fracture pattern uses energy more efficiently and subjects the cutting structure to less stress. This increases gauge integrity compared to a conventional hammer bit. The reduced exposure to competent formation significantly improves overall bit durability while enhancing ROP potential.