-

1

2

3

T u r b o d r i l l

4

1Drill collars

2Cutting

3 Rotary table

4Drill pipe

5

6

7

5

----

6Round trip

7

8

8Bit design

offset

offset

offset

9

10

9Jet bits

10Tricones

11

12Roller Cone Bits

--

13Rock Bits

1415

– 16

Drag

Bits

11

Drill string 12

Roller cutter bits 13

Milled tooth 14

Button bits 15

Tungsten carbide insert 16

Fixed cutter bits

17

18

19

20

21

.

.

Bourgoyne, A. T., Chenevert, M. E., Millheim, K. K., Young, F.

S‘’Applied Drilling Engineering’’ SPE Textbook Series 1986.

17

Fixed cutter bits 18

Steel cutterorFish tail 19

Natural diamond bits 20

Polycrystalline Diamond Compact bits(PDC) 21

Thermally Stable Polycrystalline bits(TSP)