11 5/8" DHA517GT

11 5/8" DHA517GT

• Product profile

1. With high-strength and high-wear-resistance carbide inserts which are advanced in strength and wear-resistance.
2. With new journal bearing structure which greatly prolongs the service life of the bearing, and has the ability to withstand high drilling pressure and adapt to high rotational speed.
3. Given the performance of the new type of fluorinated rubber sealing ring has been improved, it is more suitable for the working environment and operating parameters of tricone bits.
4. The new sealing structure makes the sealing performance match the bearing, thus greatly improving the service life of the bit.
5. T feature, a protection carbide inserts row is added between the outer rows and cone back rows  for the purpose of cone protection and well wall dressing.

• Cutting rows layout

4-4-3

• Applicable formation 

Designed for coalbed methane or water well, and HDD drilling, medium soft formations with low compressive strength, such as shale, soft limestone, interlayer dolomite, coal seam, etc.

• Lug protection

Both the shirttail and lug back are protected by welded wear-resisting carbide inserts and cemented carbide inserts.

• Product Specification

IADC code:              517

Bit type:                11 5/8” DHA537GT

Bearing type:            Journal bearing/Rubber sealing ring

Circulation type:         Mud

Cutting structure:

Inner rows:              Spoon

Outer rows:              Off-wedge

Bevel row:               Wedge

Protection row:           Flat

Pin connection:           6 5/8” REG

Bit diameter:             295 mm

Weight:                 88kg

• Operating suggestion

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

Weight on bit:  0.35~1.05 kN/mm

Rotation speed: 50~120 r/min