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Drill collar

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Drill collar use:
 
One of the most important components of the drill string is to provide drilling pressure to the drill bit and increase the rigidity of the drill string.
 
product description:
 
Manufactured using AISI4145H chromium-molybdenum steel, the content of trace elements is effectively controlled. According to the shape and material of the drill collar, it can be divided into three forms:
 
1. Type A (cylindrical): It is made of common alloy steel and has a circular cross-section inside and outside.
 
2. Type B (spiral type): It is made of ordinary alloy steel and has a spiral grooved drill collar on its outer surface.
 
3. Type C (non-magnetic type): It is made of stainless alloy steel with very low magnetic permeability. The cross-section of the pipe body is round and round inside and outside.

 

Drill thread

Outside diameterD

the inside diameter ofd

lengthL
mm
Chamfer
 
Shoulder
 
diameter

Df
mm

Reference bending strength ratio

mm

in

mm

in

NC31-41（27/8IF）

104.8

4 1/8

50.8

2

9150

100.4

2.43：1

NC35-47

120.7

4 3/4

50.8

2

9150

114.7

2.58：1

NC38-50（31/2IF）

127.0

5

57.2

2 1/4

9150

121.0

2.38：1

NC44-60

152.4

6

57.2

2 1/4

9150或9450

144.5

2.49：1

NC44-60

152.4

6

71.4

2 13/16

9150或9450

144.5

2.84：1

NC44-62

158.8

61/4

57.2

2 1/4

9150或9450

149.2

2.91：1

NC46-62（4IF）

158.8

61/4

71.4

2 13/16

9150或9450

150.0

2.63：1

NC46-65（4IF）

165.1

61/2

57.2

2 1/4

9150或9450

154.8

2.76：1

NC46-65（4IF）

165.1

61/2

71.4

2 13/16

9150或9450

154.8

3.05：1

NC46-67（4IF）

171.4

63/4

57.2

2 1/4

9150或9450

159.5

3.18：1

NC50-67（41/2IF）

171.4

63/4

71.4

2 13/16

9150或9450

159.5

2.37：1

NC50-70（41/2IF）

177.8

7

57.2

2 1/4

9150或9450

164.7

2.54：1

NC50-70（41/2IF）

177.8

7

71.4

2 13/16

9150或9450

164.7

2.73：1

NC50-72（41/2IF）

184.2

71/4

71.4

2 13/16

9150或9450

169.5

3.12：1

NC56-77

196.8

73/4

71.4

2 13/16

9150或9450

185.3

2.70：1

NC56-80

203.2

8

71.4

2 13/16

9150或9450

190.1

3.02：1

65/xREG

209.6

81/4

71.4

2 13/16

9150或9450

195.7

2.93：1

NC61-90

228.6

9

71.4

2 13/16

9150或9450

212.7

3.17：1

 

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Drill collar