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Cangzhou Great Drill Bits Co.,Ltd.
Bi-center Bit

Bi-center bit for Mining Machinery and abrasive formation

Overview of Bi-center Bit


This type of Bi-center bit mainly used for medium to medium-hard compressive and abrasive formation, it has medium and high-density parabolic crown and heavy cutters density for the bit has good impact resistance and anti-abrasive, high wear-resistant diamond gauge, the bit has a longer service life.


In directional applications, Bi-centre bit performance usually presents performance challenges in terms of efficiency versus power availability and dynamic issues.


GREAT designed the bi-center bit to enlarge the wellbore diameter, to replace under reaming, to help control rouble zones and for expandable tubular.


The Details of Bi-center  Bit


The details of Bi center bit 1


The details of Bi center bit 2


The Specification of Bi-center Bit


Reaming Size12 1/4"Nozzle Qty3NZ
Pass Thru Size10 1/2"Gauge Lenghth2.5"
Blade5Connection6 5/8" API REG
Primary Cutter Size16mmMake up Torque(kN.m)51.7~56.9
Rotary Speed(rpm)60~260Weight on Bit(KN)30~260
Max.WOB(KN)180Flow Rate(lps)35~70


The Advantage of Bi-center Bit


Our Bi-center bit is one piece body, you will never worry broken.


We can adjust the bi-center diameter according to your casing diameter. Generally speaking, the bigger pilot bit has smaller reaming size. The smaller pilot bit has a bigger reaming size.


GREAT's casing protection features cutting structure that provides a reliable way to drill, protecting both the cutting structure inside the casing and the casing itself.


During the design process, the pilot and reamer cutting structure are force balanced as a single unit. This provides increased drilling efficiencies in both vertical and deviated wells.


related products


product process


If you have any doubt on that ,just feel free contact with us ,we will have future explain and provided drawing.

We will contact you within 24 hours.
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