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Drill collars(Type A,B andC)are manufactured according to API and SY/T standards .
Drill Collars (Type A and B) are made of 4145H chromium molybdenum alloy steel ,
chemical composition and residual elements are well controlled.

Drill collars Type c (non-magnetic)are made from low carbon austenitic alloy
abtained by combining a proprietary chemical anylysis and a rotary hammer forging
process with low magnetic permeability excellent machine ability.

Each drill collar is fully inspected by internal inspection dept.All data obtained are
recorded on the inspection certificate furnished with eath drill collar.

API monogram ,serial number , OD ,ID ,type and size of connections are stamped on
recessed mill flats.
Drill collars are available in lengths from 10 to 31 feet and outside diameter from

3 1/8" to 11"






钻铤的标准尺寸、内径和螺纹类型
Standard size, bores and connection for drill collars

外径D
OD

内径D
ID

长度L
length
mm

台肩倒角直径DF
Bevel diameter
mm

螺纹类型
Connection style
and size

参考的弯曲强度比
Bending strength
ratio

in
mm
in
mm

31/8
79.4

11/4

31.8

9150

76.2　

NC23

2.57:1

31/2

88.9

11/2
38.1

9150

82.9

NC26(23/8IF)

2.42:1

41/8

104.8

2
50.8
9150

100.4

NC31(27/8IF)
2.43:1

43/4
120.7

2
50.8

9150

114.7

NC35
2.58:1

5
127

21/4
57.2
9150
121.0

NC38(31/2IF)

2.38:1

6

152.4

21/4
57.2
9150或9450
144.5
NC44
2.49:1

6
152.4

213/16
71.4

9150或9450

144.5
NC44

2.84:1

61/4
158.8

21/4
57.2
9150或9450
149.2
NC44

2.91:1

61/4
158.8

213/16
71.4

9150或9450

150.0

NC46(4IF)

2.63:1

61/2
165.1

21/4
57.2

9150或9450

154.8

NC46(4IF)

2.76:1

61/2
165.1

213/16

71.4

9150或9450

154.8

NC46(4IF)
3.05:1

63/4
171.4

21/4

57.2

9150或9450

159.5

NC46(4IF)

3.18:1

63/4
171.4

213/16
71.4

9150或9450

159.5

NC50(41/2IF)
2.37:1

7
177.8

21/4
57.2
9150或9450

164.7

NC50(41/2IF)

2.54:1

7
177.8

213/16
71.4
9150或9450

164.7

NC50(41/2IF)
2.73:1

71/4
184.2

213/16
71.4
9150或9450

169.5

NC50(41/2IF)

3.12:1

73/4
196.8

213/16
71.4
9150或9450
185.3

NC56
2.70:1

8

203.2

213/16
71.4
9150或9450

190.1

NC56

3.02:1

81/4
209.6

213/16
71.4
9150或9450

195.7

65/8REG
2.93:1

9
228.6

213/16
71.4
9150或9450

212.7

NC61
3.17:1

91/2
241.3

3
76.2
9150或9450

223.8

75/8REG

2.81:1

93/4
247.6

3
76.2
9150或9450
232.6

NC70

2.57:1

10
254.0

3
76.2
9150或9450

237.3

NC70

2.81:1

11
279.4
3
76.2
9150或9450
266.7

85/8REG

2.84:1

钻铤的机械性能(A型、B型)
Mechanical properties of drill collar (Type A or B)

钻铤外径
抗拉强度 σ b
屈服强度 σ 0.20
延伸率δ 4
夏比冲击功 Akv
布氏硬度 HB
OD of drill collar
Tensile strength
Yield strength
Elongation
Charpy impact
Hardness
in
MPa
MPa
%
J
(Brinell)
3 1 / 8 --6 3 / 4
≥ 965
≥ 758
≥ 13
≥ 54
285--341
7--11
≥ 930
≥ 689
≥ 13
≥ 54
285--341

C型钻铤的磁性能  MAGNETIC PROPERTIES OF DRILL COLLAR TYPE C
磁场强度为1* 10³*10² /4πA/m时： When MPC=1* 10³*10²/4πA/m:
相对磁导率μr≤1.010   Relative magnetic permeability   μr ≤0.010
磁场梯度   Magnetic Field Gradient      △B≤0.05μT

C型钻铤的机械性能
MECHANICAL PROPERTIES OF DRILL COLLAR TYPE C

外径范围
屈服强度 σ 0.20
抗拉强度 σ b
伸长率δ 4
布氏硬度 HB
夏比冲击功 Akv
OD
Yield strength
Tensile  strength
Elongation
Hardness
Charpy impact value
mm
in
MPa
MPa
%
(Brinell)HB
J
79.4--171.4
3 1 / 8 --6 3 / 4
≥ 758
≥ 827
≥ 18
-
-
177.8--279.4
7--11
≥ 689
≥ 758
≥ 20
-
-

 

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