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TRICONE DRILL BITS IADC CODES

HOW TO READ IADC CODES FOR TRICONE DRILL BITS

FIRST DIGIT FORMATION
1 STEEL TOOTH BITS for Soft Formation
2 STEEL TOOTH BITS for Medium Formation
3 STEEL TOOTH BITS for Hard Formation
TUNGSTON CARBIDE INSERT (TCI)
4 TCI BUTTON BIT fir Soft Formation
5 TCI BUTTON BIT for Soft/Medium Formation
6 TCI BUTTON BIT for Medium Formation
7 TCI BUTTON BIT for Medium/Hard Formation
8 TCI BUTTON BIT for Hard Formation
SECOND DIGIT FORMATION

PLEASE NOTE THE FIRST DIGIT DETERMINES FORMATION HARDNESS.  THE SECOND DIGIT IS ONLY A FURTHER BREAKDOWN WITHIN THE FIRST DIGITS FORMATION.  FOR EXAMPLE, IADC CODE OF 311, 321, 331 ARE ALL HARD FORMATION BITS.  

1 Soft Formation
2 Medium Formation
3 Medium/Hard Formation
..
THIRD DIGIT BEARING AND SEAL TYPE
1 Standard Open Bearing Bit
2 Standard Open Bearing Bit Air Cooled
3 Standard Open Bearing Bit with Gauge Protection
4 Sealed Roller Bearing Bit
5 Sealed Roller Bearing Bit with Gauge Protection
6 Journal Sealed Bearing Bit
7 Journal Sealed Bearing Bit with Gauge Protection
FOURTH DIGIT ADDITIONAL FEATURES
A Air Application
B Special Bearing
C Center Jetted
D Deviation Control
E Extended Jets
G Extra Gauge or Body protection
H Horizontal/Steering
J Jet Deflection
L Lug Pads
M Motor Application
S Standard Steel Tooth
T Two Cone
W Enhanced Cutting Structure
X Chisel Inserts

 

The first digit represents the hardness of rock formation the tricone drilling bit buttons or teeth are best suited for.

Every drill bit is designed for a certain type of rock formation, ranked according to hardness.
The bit is assigned a number between 1 and 8 indicating the type of rock the teeth or buttons of a drilling bit are designed for:

1, 2 and 3: Indicate a steel tooth. 1 is engineered for soft rock formations, 2 for medium formations, and 3 for hard formations.

4, 5, 6, 7, and 8: Indicates a tungsten carbide insert (TCI).
Within this category 4 is designated for the softer formations, with 8 representing the hardest formations

The second digit represents further rock formation information.

Regardless of tooth type, the second digit takes into account all factors of the bit and ranks the rock formations the drilling bit is best suited for on a scale from 1 to 4. 1 represents soft formations going up to 4 representing the hardest formations.

The third digit represents the bearing type of the Tricone Drilling Bit.

For Example, Tricone Drilling Bits use a different bearing depending on the type of material to be drilled.

1, 2 and 3: are for roller bearings. 1 is for standard roller bearings, 2 is for air cooled bearings, and 3 is for open bearing with gauge protection.

4 and 5: sealed roller bearings. 4 is for standard sealed roller bearings, and 5 is for a sealed roller bearing with gauge protection.

6 and 7: sealed journal bearings. 6 is for a standard sealed journal bearing, and 7 is for a sealed journal bearing with gauge protection.

The fourth digit is a letter indicating the special properties of the Tricone Drilling Bit.

In addition to the buttons, intended rock formations, and bearings used, tricone drill bits can have numerous other special properties:
A – Air Application
B – Special Bearing
C – Center Jetted
D – Deviation Control
E – Extended Jets
G – Extra Gauge or Body protection
H – Horizontal/Steering
J – Jet Deflection
L – Lug Pads
M – Motor Application
S – Standard Steel Tooth
T – Two Cone
W – Enhanced Cutting Structure
X – Chisel Inserts

For more information please contact International Association of Drilling Contractors (IADC)