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 drill bit performance usually presents perfect in terms of efficiency versus power availability and dynamic issues.
Great Drill Bits 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 Specification of Bi-center Bit
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Reaming Size
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12 1/4"
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Nozzle Qty
|
3NZ
|
|
Pass Thru Size
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10 1/2"
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Gauge Lenghth
|
2.5"
|
|
Blade
|
5
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Connection
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6 5/8" API REG
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|
Primary Cutter Size
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16mm
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Make up Torque(kN.m)
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51.7 ~ 56.9
|
|
Rotary Speed(rpm)
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60 ~ 260
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Weight on Bit(KN)
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30 ~ 260
|
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Max.WOB (CN)
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180
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Flow Rate(lps)
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35 ~ 70
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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.
