API roller drilling bits/2 inch drill bit

Size

8 1/2”(215.9MM)

IADC

517

Bearing Type

Elastomer sealed journal bearing

Thread Connection

4 1/2 reg pin

WOB(KN/mm)

0.45~1.0

RPM(r/min)

120~50

Applicable Formations

 medium to hard hardness formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc

Circulation system

Mud pump

60mm,65mm,76mm,93mm,95mm,98mm(3 7/8”),101.6mm,114mm,118mm,120mm,127mm(5”)

130.1mm(5 1/8”),133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm(5 7/8”)

152.4mm(6”),155.5mm(6 1/8”),158.7mm(6 1/4”),161.9mm(6 3/8”),165.1mm(6 1/2”)

190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7/8”)

212.7mm(8 3/8”),215.9mm(8 1/2”),222.2mm8 3/4”)                                                                                                         

241.3(9 1/2”),244.4(9 5/8”),250.8(9 7/8”)

269.8(10 5/8”),295.3(11 5/8”)

311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3/4”)

374.6(14 3/4”)

381(15”),393.7(15 1/2”),406.4(16”)

444.5(17 1/2”),508(20”),558(22”),609.6(24”)

660.4(26”)

Steel tooth

(IADC)

111, 121,131

117,124,126,127,136,137                                                                                                                                 

211,311

216,217, 227

TCI

(IADC)

415,435, 417,437

515,525,535,545, 517,527,537,547

615,625,635,,617,627,637,737

512,522,532,612,622,632,732