Size

*7 1/2”(**4.5mm)

IADC

**7G

Bearing Type

Elastomer sealed journal bearing

Thread Connection

7 5/8 reg pin

WOB(KN/mm)

0.3~0.*5

RPM(r/min)

**0~*0

Applicable Formations

Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, etc. 

Circulation system

Mud pump

*0mm,*5mm,*6mm,*3mm,*5mm,*8mm(3 7/8”),**1.6mm,**4mm,**8mm,**0mm,**7mm(5”)

**0.1mm(5 1/8”),**3.3mm(5 1/4”),**9.7mm(5 1/2”),**2.8mm(5 5/8”),**9.2mm(5 7/8”)

**2.4mm(6”),**5.5mm(6 1/8”),**8.7mm(6 1/4”),**1.9mm(6 3/8”),**5.1mm(6 1/2”)

**0.5mm(7 1/2”),**3.6mm(7 5/8”),**0.0mm(7 7/8”)

**2.7mm(8 3/8”),**5.9mm(8 1/2”),**2.2mm8 3/4”)                                                                                                         

**1.3(9 1/2”),**4.4(9 5/8”),**0.8(9 7/8”)

**9.8(*0 5/8”),**5.3(*1 5/8”)

**1.1(*2 1/4”),**6.0 (*3 5/8”),**9.2(*3 3/4”)

**4.6(*4 3/4”)

**1(*5”),**3.7(*5 1/2”),**6.4(*6”)

**4.5(*7 1/2”),**8(*0”),**8(*2”),**9.6(*4”)

**0.4(*6”)

Steel tooth

(IADC)

**1, **1,**1

**7,**4,**6,**7,**6,**7                                                                                                                                 

**1,**1

**6,**7, **7

TCI

(IADC)

**5,**5, **7,**7

**5,**5,**5,**5, **7,**7,**7,**7

**5,**5,**5,,**7,**7,**7,**7

**2,**2,**2,**2,**2,**2,**2