factory 8.5" closed bearing water well drilling tricone rock bit for underground

IADC 437  Soft Formation
      The 437 tci bits are used to drill   low compressive strength,very soft formations .TCI bits maximize the use of   bothconical and chisel tungsten carbide inserts of large diameters and high   projection.This cutting sstructure design,combined with maximum cone   offset,results in high bit penetration rates .The deep intermesh of cutter   rows prevents bit bailing in sticky formations.

IADC 517   Medium Formation

      The 517features aggressive chisel   tungsten carbide inserts on the heel rows and inner rows.This desing provides   a fast drilling rate and added cutting structure durability in medium-to   medium hard formations .The HSN rubber o-ring provides adequate sealing for   bearing durability.

IADC 617  Medium-Hard Formation

      The 617features robust chisel   tungsten carbide inserts on the heel row and conical on the inner rows.This   design provides a fast drilling rate and added sutti8ng structure durability   in medium to medium hard formations .The HSN rubber o-ring [rovodes adequate   sea;omg fpr bearomg dirability.

IADC 637  Hard Formation

      The 637bits can be used to drill   hard and abrasive formations .Wearresistant tungsten carbide inserts are used   in the outer rows to prevent loss of bit gauge.Maximum numbers of   bemisphericalshaped inserts are used in all rows to provide cutter durability   and long life.

IADC 114. 115.116.117  Soft formation

The 114-117 bits are used   to drill low-compressive strength,soft formations. Long projection tooth   lengths are used on high offset cones to provide the greatest penetration   rates possible. Wear-resistant hard facing is used to control tooth wear.On   the softest bi types this hard facing completely covers the bit teeth

IADC 124.125.126.127  Medium formation

Medium formation with   high-compressive strength and high drillability. Such as sandstone,   anhydrite, salt, shale, limestone.

IADC 134.135.136.137    Medium soft formation

   Formations with low compressive strength,   such as shale, anhydrite, sand and so on for soft formation

IADC216.217    Medium hard formation

The 216-217 bit are always   used to Soft to medium formations with

low-compressive strength, such as   shale, anhydrite, sand and so on for soft formation.