IADC Bit types and classification

IADC CLASSIFICATION OF DRILL BITS

Numerous types of drill bits are available, i.e. the

largest manufacturer makes 34 types and 33 sizes and

many more on request - Confusing.

Code: 5 2 2 R

1. Series

2. Type

3. Feature

4. Feature (2)

Classification of RCB

Sta

nd

ard

Ro

ller

Bea

rin

g

Ro

ller

Bea

rin

g

Air

Co

ole

d

Ro

ller

Bea

rin

g

Gau

ge

Pro

tect

ed

Sea

lled

Ro

ller

Bea

rin

g

Sea

lled

Ro

ller

Bea

rin

g

Gau

ge

Pro

tect

ion

Sea

led

Fri

ctio

n

Bea

rin

g

Sea

led

Fri

ctio

n B

eari

ng

Gau

ge

Pro

tect

ion

SE

RIE

S

FORMATIONS

TY

PE

S

1

Soft formations with low

compressive strenght and high

drillability

1

2

3

4

2Medium to med-hard formations

with high compressive strenght

1

2

3

4

3Hard semi-abrassive and abrassive

formations

1

2

3

4

4

Soft formations with low

compressive strenght and high

drillability

1

2

3

4

5Soft formations with low

compressive strenght

1

2

3

4

6Medium hard formations with high

compressive strenght

1

2

3

4

7Hard semi-abrasive and abrassive

formations

1

2

3

4

8Extremely hard and abrasive

formations

1

2

3

4

5 6M

ille

d-T

oo

th B

its

1 2

Dir

ecti

on

al

Oth

er

Inse

rt B

its

IADC BIT CLASSIFICATION FORM

FEATURES

7 8 93 4

CO DE FEATURE CO DE FEATURE

A Air application N

B O

C Center jet P

D Deviation control O

E Extended jets R Reinforced welds

F S Standard steel teeth

G Extra gauge/body protection T

H U

I V

J Jet deflection W

K X Chisel insert

L Y Conical insert

M Z Other insert

FEATURE (2)

Example

Code: 5 2 2 R

5 = code for "insert bits“

2 = code for "soft to medium formation“

2 = code for "roller bearing air cooled“

R = code for "reinforced welds"

Code: M 5 8 2

1. Cutter type and body material,

2. Cross-section profile,

3. Hydraulic design,

4. Cutter size and density

Classification of Drag Bits

First code designations are

D Natural diamond/matrix body

M Polycrystalline diamond cutters/matrix body

S Polycrystalline diamond cutters/steel body

T Thermally stable polycrystalline diamond cutters/matrix body

O Other

Second code designations are

1. long taper/deep cone

2. long taper/medium cone

3. long taper/shallow or no cone (parabolic)

4. medium taper/deep cone

5. medium taper/medium cone

6. medium taper/shallow or no cone(rounded)

7. short taper/deep cone (inverted)

8. short taper/medium cone

9. short taper/shallow or no cone (flat)

Third code designations are

1. bladed/changeable jets

2. bladed/fixed ports

3. bladed/open throat

4. ribbed/changeable jets

5. ribbed/fixed ports

6. ribbed/open throat

7. open face/changeable jets

8. open face/fixed ports

9. open face/open throat

10. alternative codes

1. radial flow

2. cross flow

3. other

Fourth code designations are

1. Cutter size: large, medium and small

2. Cutter density: light, medium and heavy

Example

Code: M 5 8 2

M code for “polycrystalline diamond cutters/matrix

body“

5 code for "medium taper/medium cone“

8 code for "fixed ports/open face“

2 code for "medium cutter size/light cutter

density”