6 3/4" DHV537GT

6 3/4" DHV537GT

• Product profile

1. Journal bearing has the ability to withstand medium pull down and adapt high rotation speed.
2. The new flat seal bearing structure is adopted to increase the stability of the sealing structure and greatly prolongs the working life of the bearing.
3. Oil storage system can balance the pressure difference and provide a good lubrication guarantee for the bearing system.
4. Adopt high strength and wear resistance carbide insert, optimize the design of cutting rows, quantity, exposed height and shape of insert, improve the efficiency and service life of cutting structure.
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 water well and HDD drilling, low compressive strength, medium soft, hard abrasive interbedded formation, such as hard shale, anhydrite, soft limestone, sandstone, interbedded dolomite, etc.

• Lug protection

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

• Product Specification

IADC code:              537

Bit type:                6 3/4” DHV537GT

Bearing type:            Journal bearing/Rubber sealing ring

Circulation type:         Mud

Cutting structure:

Inner rows:              Spoon

Outer rows:              Off-wedge

Bevel row:               Flat

Protection row:           Wedge

Pin connection:           3 1/2” REG

Bit diameter:             171 mm

Bit weight:              21 Kg

Operating suggestion

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

Weight on bit: 0.4～1.05 kN/mm

Rotation speed: 40~110 r/min