Roller Cone Bit of Rock Drilling Bit 17-1/2 " TCI Tricone Bit Of
Well Drilling Equipment
1 . Descriptions:
Tungsten Carbide Insert (TCI) bits serve as indispensable tools for
drilling operations in middle to hard rock formations, presenting a
versatile range of carbide inserts meticulously designed to address
the varying hardness levels of rock encountered during drilling
endeavors. These inserts come in diverse shapes, including
spherically shaped inserts tailored for exceptionally hard rock
formations and conically shaped inserts optimized for softer rock
materials.
The selection of carbide inserts plays a pivotal role in
determining the efficiency and effectiveness of the drilling
process, as different rock formations demand specific insert
configurations to achieve optimal results. The number of rows of
inserts featured on TCI bits is directly correlated with the nature
of the application and the desired hole size, allowing for
customizable configurations that cater to specific drilling
requirements.
2. Specification:
| BIT SPECIFICATIONS |
| Diameter: | 17-1/2 ”(444.5mm) |
| Body Type : | Steel Body |
| Tooth Type: | TCI Tooth |
| Bearing : | Sealed Rearing |
| API Thread API Connection: | 7-5/8 API REG |
| IACD CODE : | 537 |
| OPERATION PARAMETERS |
| Weight (Kg): | 240 KGS |
| RPM Range (rotary): | 130-40 |
| Weight on Bit(kN): | 222- 467 kN |
| Make Up Torque ( KN): | 46- 54 KN |
3 . Tricone 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.
