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Name:drill collar
Type:drill collar
Model Number::API
Certification:API
Processing Type:Forging
Material:Carbon Steel

Product Description

The drill collar is attached to the lower end of the drill pipe. The shape of the drill collar is similar to that of the drill pipe, which is thicker than the drill pipe and heavier than the drill pipe.The drill collar is made of rolled or forged AISI 4145H chrome-molybdenum alloy steel for effective control of chemical and trace element content.

The drill collar is at the bottom of the drill string and is a major component of the lower drill assembly. Its main feature is the large wall thickness (generally 38~53mm, which is equivalent to 4~6 times of the wall thickness of the drill pipe), with greater gravity and stiffness.

Size

in

O.D

mm

I.D.

mm

Code

Thread

Length

mm

Weight

kg

3 1/8

79.4

31.81-1/4

NC23-31

NC23

9140

298

3 1/2

88.9

38.11-1/2

NC26-35

NC26

9140

364

4 1/8

104.8

50.82

NC31-41

NC31

9140/9450

474/490

4 3/4

120.6

50.82

NC35-47

NC35

9140/9450

674/697

5

127

57.22-1/4

NC38-50

NC38

9140/9450

725/749

6

152.4

57.22-1/4

NC44-60

NC44

9140/9450

1125/1163

6

152.4

71.42-13/16

NC44-60

NC44

9140/9450

1022/1056

6 1/4

158.8

57.22-1/4

NC44-62

NC44

9140/9450

1237/1279

6 1/4

158.8

71.42-13/16

NC46-62

NC44

9140/9450

1134/1172

6 1/2

165.1

57.22-1/4

NC46-65

NC46

9140/9450

1352/1398

6 1/2

165.1

71.42-13/16

NC46-65

NC50

9140/9450

1249/1291

6 3/4

171.4

57.22-1/4

NC46-67

NC46

9140/9450

1471/1521

7

177.8

57.22-1/4

NC50-70

NC50

9140/9450

1597/1651

7

177.8

71.42-13/16

NC50-70

NC50

9140/9450

1494/1545

7 1/4

184.2

71.42-13/16

NC50-72

NC50

9140/9450

1625/1680

7 3/4

196.8

71.42-13/16

NC56-77

NC56

9140/9450

1895/1960


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