IADC537 8 3/4" TCI tricone drill bits

IADC

WOB(KN/mm)

RPM(r/min)

Applicable Formations

 417/427

 0.3-0.9

 150-70

very Soft formation with low compressive strength and high drillability,such as clay,soft mudstone,shale,salt,loose sands,etc.

 437/447

 0.35-0.9

150-70 

  very Soft formation with low compressive strength and high drillability,such as clay,soft mudstone,shale,salt,loose sands,etc.

 515/525

 0.35-0.9

180-60 

 very Soft formation with low compressive strength and high drillability,such as mudstone,salt,soft limestone, sands,etc.

517/527

0.35-1.0

140-50

Soft formation with low compressive strength and high drillability,such as  mudstone,salt,soft limestone,sands,etc

535/545

0.35-1.0

150-60

 medium soft with harder formation, more abrasive streaks,such as hard shale,mudstone,soft limestone,etc.

537/547

0.4-1.0

120-40

medium soft with harder formation, more abrasive streaks,such as hard shale,mudstone,soft limestone,etc.

617/627

 0.45-1.1

90-50 

 medium hard with higher compressive strength as well as thick and hard streaks,such as hard shale,sands,limestone,dolomite,etc.

637

0.5-1.2

80-40

 medium hard with higher compressive strength as well as thick and hard streaks,such as hard shale,sands,limestone,dolomite,etc.

 737

 0.7-1.2

70-40 

 Hard with high abrasiveness such as hard limestone,dolomite,firm sands,etc

827/837

 0.7-1.2

 70-40

 very hard with high abrasiveness,such as quartzite,quaruzite sand,chert,basalt,granite,etc.