Roller Cone Drilling Bit 12 Inch TCI Tri-cone Drill Bit IADC 437
1 . Descriptions:
TCI (Tungsten Carbide Insert) bits are utilized for drilling in
medium to hard rock formations. These bits feature a range of
carbide inserts, such as spherical inserts for extremely hard rock
or conical inserts for softer rock. The number of insert rows is
determined by the specific application and hole size requirements.
Additionally, there are options for open or sealed bearings, as
well as three types of shirttail protection. TCI stands for
Tungsten Carbide Insert.
2. Specification:
| BIT SPECIFICATIONS |
| Diameter: | 12”(304.8m) |
| Body Type : | Steel Body |
| Tooth Type: | TCI Tooth |
| Bearing : | Sealed Rearing |
| API Thread API Connection: | 6-5/8 API REG |
| IADC CODE : | 437 |
| OPERATION PARAMETERS |
| Weight (Kg): | 98 KGS |
| Flow Rate (LPS): | 80-220 |
| RPM Range (rotary): | 130-40 |
| Weight on Bit(kN): | 152-300kN |
| Make Up Torque ( KN): | 52 - 57KN |
3 . Bit profile
4 . Bearing Types
There are primarily three types of bearing designs used in tricone
drilling bits:
• STANDARD OPEN BEARING ROLLER BIT:
On these bits the cones will spin freely. This type of bit has a
front row of ball bearings and a back row of roller bearings.
• SEALED BEARING ROLLERS BITS
These bits have an O-Ring seal with a grease reservoir for bearing
cooling. The seals acts as a barrier against mud and cuttings to
protect the bearings
• JOURNAL BEARING ROLLER BITS
These bits are strictly oil/grease cooled with nose bearings,
O-Ring seal and a race for maximum performance.
5. Question :
What we should be pay attention on choosing the tricone drill bit ?
- IADC code passport
- TCI & Steel tooth options
- Additional tungsten carbide inserts on heel rows
- Tungsten carbide coating on cone bodies
- Diamond coated tungsten carbide inserts on the gauge of the cones
- Tungsten carbide inserts on the shirttail of the legs
- Additional central nozzle for cleaning cones
The tricone feature is that they come with their own passport as
below :
- The specification of the cones
- The quality stamp signed by the person who made and checked the bit
- The recommended drilling parameters to get the best performance out
of the bit:
- Bit weight
- Rotation speed
- Flushing volume
Which type of tricone you should choose ?
It depends on the geology you are drilling in and the diameters of
the borehole you are drilling. The International Association of
Drilling Contractors (IADC) have developed an easy use step system
to choose the right tricone for your geology with additional
features such as bit protection for longer production life.
