China 8 1 2 Inch 517 Carbide Drill for Hard Drilling

8 1/2 inch 517 carbide drill for hard drilling
1>Soft formation TCI Tricone drill bit

The soft formation TCI tricone drill bit are used to drill low compressive strength,very soft formations.
This bit maximized to use both conical and chisel tungsten carbid insters of large diameters and high projection.
This cutting structure design combined with maximum cone offset ,result in high bit penetration rates ,The deep i
ntermesh of cutter rows prevents bit bailing in sticky formations.kingdream drill bit

2>Medium hard formation TCI trcone drill bit

The meduim formation TCI tricone drill bit features aggresive chisel tungsten carbid insters on the heel rows
and inner rows .This design provides a fast drilling rate and added cuttering structure durability in medium and
medium hard formations.The rubber O-ring provide adequate sealing for bearing durability.kingdream drill bit tricone rock drill bit
kingdream drill bit
3>Hard formation TCI tricone drill bit

The har formation TCI tricone drill bits can be used to drill hard and abbredive formations.Wear resistence
tungsten carbid insters are used in the outer rows to prevent loss bit gauge.Maximm numbers of hemispherical
shaped insterts are used in all rows to provide cutter durability and long life. tricone rock drill bit

TCI BITS for Soft - Medium Soft formations
Features large chisel-shaped tungsten carbide inserts to provide the highest penetration rates in the softest formations such as shales, clays, limestone and sands.
IADC CODES 437 - 517 - 527
TCI BITS for Medium Hard - Hard formations
Effective in a variety of formations with higher compressive strength such as hard limestone,
sandstone, dolomite and other formations with high abrasive quality, hard streaks and broken formations.
IADC CODES 617 - 627 - 637
TCI BITS for Hard and abrasive formations
With hemispherical tungsten carbide inserts. To optimize penetration rate in hard and abrasive
formations such as granites, basalts, quartzite and chert. Drilling weight of 3 ± 4 tons per inch of diameter should be applied.
IADC CODES 732 - 737 - 837