12 1/4” DHA117GT

12 1/4" DHA117GT

• Product profile

1. New steel tooth bit design, tooth surface, back cone hard surface enhancement, high tooth exposure, back cone insert teeth, between the back cone tooth and the outer row tooth increased a row of trimming teeth.
2. New journal bearing structure greatly prolongs the working life of the bearing, and has the ability to withstand medium bit pressure and adapt to high speed.
3. Updated O-shaped rubber sealing ring is more suitable for the working environment and operation parameters of roller cone bit.
4. New sealing structure makes the sealing performance match with the bearing, thus greatly prolongs the service life of the drill bit.

• Cutting layout

3-3-2

• Applicable formation 

Designed for water well and HDD drilling, It is suitable for very soft formations with low compressive strength and high drillability, such as soft shale, clay and salt rock.

• Lug protection

The shirttail of lug is protected by cemented carbide insert, the lug back is protected by welded wear-resisting carbide and ogive inserts.

• Product Specification

IADC code:              117

Bit type:                12 1/4” DHA117GT

Bearing type:            Journal bearing/Rubber sealing ring

Circulation type:         Mud

Cutting structure:

Inner rows:              Wedge

Outer rows:              Wedge

Bevel row:               Flat

Protection row:           Wedge

Pin connection:           6 5/8” REG

Bit diameter:            311 mm

Bit weight:              98 kg

• Operating suggestion

During normal drilling, weight on bit and rotation speed cannot be used at the same time:

Weight on bit:  0.35~0.9 kN/mm

Rotation speed:  80~150 r/min