7 7/8″ DHV537GKT

Specifications

Size: 7 7/8″ (200.03 mm)
IADC: 537
Bearing and Seal: Journal Bearing / Composite seal
No. of Rows: 4-4-3
Inner Row: Chisel / 63 pcs
Gauge Row: Wedge / 36 pcs
Trimming Row: Wedge / 29 pcs
Bevel Row: Flat / 46 pcs
Pin Connection: 4 1/2 REG
Bit Weight (KG): 34.0
Weight on Bit (KN/mm): 0.40 ~ 1.05
ROP (rpm): 40 ~ 110

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– Adopt high strength and high wear resistance carbide inserts.
– Adopting the Journal bearing structure, it has the ability to withstand medium WOB and adapt to higher ROP.
– Adopting a new type of flat sealed bearing structure, which increases the stability of the sealed structure and greatly prolongs the working life of the bearing.
– The oil storage system can balance the pressure difference inside and outside the bearing, and provide good lubrication guarantee for the bearing system.
– 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.
– K feature, the inner row adopts wide-topped spoon insert, whichincreases the cutting width of the insert and improves the drilling efficiency.