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BC Series i-enter Bits
for sale in Russia/Caspian: Russia, Kazakhstan, Azerbaijan, Ukraine, Belarus, Uzbekistan, Tajikistan, and Turkmenistan

8-1/2 X 9-7/8" BC-5136

The BC-5136 is a 5-blade Bi-Center design employing a moderate nose profile and robust reamer section. The BC-5136 is designed for drilling shales, limestones and moderately abrasive sands. The BC-5136 uses 13mm PDC cutters for improved reliability and smoother torque response. High junk slot volume and blade standoff help reduce bit balling. The BC-5136 includes Encores Lo-Drag dome cutters as stability elements in the transition section of the BC-5136.
SPECIFICATIONS 8-1/2 X 9-7/8
Pilot Cutters24
Reamer Cutters32
Gage Length2
Nozzles6
Connection4-1/2 REG
Length (Overall, Make-Up)20-1/2, 16-1/4


Hydraulic energy is focused on the reaming side of this design to compensate for the increased cuttings volume and longer exit point. Smaller nozzles are recommended in the reaming section to preclude excessive hydraulic pressure damming while drilling softer formations. The BC-5136 is available with WO and SO type PDC cutters for specific applications types. Our Super Duty gage option can also be included in this design.
OPERATING PARAMETERS 8-1/2 X 9-7/8
Make-Up Torque (max)14-18K ft/lb
Flow Rate (GPM)550-700
RPM Range60-150
Bit Weight (LBS)5K 30K


"8-1/2" X 9-1/2" BC-5137

The BC-5137 is a 5-blade Bi-Center design employing a moderate nose profile and robust reamer section. The BC-5137 is designed for drilling shales, limestones and moderately abrasive sands. The BC-5137 uses 13mm PDC cutters for improved reliability and smoother torque response. High junk slot volume and blade standoff help reduce bit balling. The BC-5137 includes Encores Lo-Drag dome cutters as stability elements in the transition section of the BC-5137.
SPECIFICATIONS 8-1/2 X 9-1/2
Pilot Cutters29
Secondary Face Cutters22
Gage Length2
Nozzles7
Connection4-1/2 REG
Length (Overall, Make-Up)20-1/2, 16-1/4


Hydraulic energy is focused on the reaming side of this design to compensate for the increased cuttings volume and longer exit point. Smaller nozzles are recommended in the reaming section to preclude excessive hydraulic pressure damming while drilling softer formations. The BC-5137 is available with WO and SO type PDC cutters for specific applications types. Our Super Duty gage option can also be included in this design.
OPERATING PARAMETERS 8-1/2 X 9-1/2
Make-Up Torque (max)14-18K ft/lb
Flow Rate (GPM)550-700
RPM Range60-150
Bit Weight (LBS)5K 30K



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