What Is Tricone Drill Bit?
Tricone Drill Bitis an ideal solution for soft, medium, or hard
rock formations, it is connected with the drill stem and rotates
along with it, and drive cones to pressed on the rock. Each cone
rotates round the axis of its leg and three cones simultaneously
revolve around the bit center. The tungsten carbide inserts on the
cone shell cause the formation to spall under the weight on bit and
the impact load of cone rotating, the debris will be discharged out
to hole by compression air. Tricone bits come in several different
varieties, and can deal with a wide range of different rock
formations. It is important to know the type of formation you are
drilling in when selecting a drill bit.
Application:
Medium to Medium-Hard Formation
For use in moderately abrasive consolidated formations with
compressive strength ranging between 140 – 485 Mpa such as hard
limestone, quartzite, granodiorite, and medium grade metamorphic
formations
Cutting structure: These bits are characterized by moderately
spaced conical inserts with medium projection. This configuration
promotes good penetration rates in medium hard and moderately
abrasive formations. Smaller carbide inserts are provided on the
gage and inner rows or hard metal is deposited in the nose area to
contain shell erosion and improve performance.
Weight on Bit (WOB):2,500 – 7,000 lbs/in of bit diameter
Compression Strength:20,000 – 70,000 psi
Drilling Speeds:60 – 100 rpm
Jet Circulation:All sizes
Cutting Structure
Gauge rows are ovoid type and inner rows are conical type:
Designed for medium hard and abrasive formation with high
compressive strengths such as limestone, sandstone, dolomite and
chert.
Application: 29,000-38,000 PSI(200-260MPa)
Shirttail
Two rows tungsten carbide on the shirttail;Wear resistant carbide
on the side of lug
Product Specification
IADC Code: 645/642
Bearing Type: Roller-Ball-Roller-Thrust Button/Sealed bearing/Open
bearing
Circulation Type: Jet Air
Cutting Structure:-Inner and Nose rows: Conical -Gauge rows: Ovoid
-Heel rows: round
Pin Connection: 6 5/8” API
Bit Diameter: 311mm (12 1/4“)
Product Weight: 100KG (216Lbs)
Operating Suggestions
Weight on Bit: 36750-73500 Lbs
Rotary Speed: 100-60 RPM
Air Back Pressure: 0.2-0.4 MPa
