API Spec 12-1/4 " Milled Tooth Tricone Drill Bit Of Oil Drilling Tool

1 . Descriptions:

Steel Tooth (or Mill Tooth) tricone bits exhibit a diverse array of characteristics that cater to a wide range of downhole conditions encountered in various geological formations.

The unique design of Mill Tooth tricone bits is specifically tailored for applications in soft rock formations. Their distinctive steel teeth are adept at efficiently navigating through softer materials, ensuring optimal performance in such environments. These tricone bits feature strategically placed teeth with ample spacing between them, which effectively prevents clogging and material buildup during the cutting process. This design not only enhances the cutting efficiency but also prolongs the lifespan of the bit by reducing the risk of blockages.

Moreover, the milled tooth structure of these tricone bits offers superior durability and resilience, enabling them to withstand the abrasive nature of softer formations while maintaining consistent performance levels. The robust construction of the steel teeth ensures high wear resistance, making them well-suited for extended drilling operations in challenging geological conditions.

2. Specification:

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.