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API Spec 7/API RP 7G AISI 4145H Drill Collar

  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
  • API Spec 7/API RP 7G AISI 4145H Drill Collar
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Product Description

 

According to API Spec.7 and SY/T5144, drill collar is made of AISI 4145 modified chromium- molybdenum alloy steel. All threads are phosphated, copperized or cold rolled , and they are machined with CNC Lathes –Double –shoulderd, including some special threads. The maximum outer diameter of drill collars can amount to 14 inch.

Standard size, inner diameter and threads for drill collar

No.

Outer diameter

Inner diameter

Length mm

DF       mm

Bending intensity ratio

mm

in

mm

in

NC23-31

79.4

3 1/8

31.8

1 1/4

9150

76.2

2.57:1

NC26-35

88.9

3 1/2

38.1

1 1/2

9150

82.9

2.42:1

NC31-41

104.8

4 1/8

50.8

2

9150 or 9450

100.4

2.43:1

NC35-47

120.7

4 3/4

50.8

2

9150 or 9450

114.7

2.58:1

NC38-50

127.0

5

57.2

2 1/4

9150 or 9450

121.0

2.38:1

NC44-60

152.4

6

57.2

2 1/4

9150 or 9450

144.5

2.49:1

NC44-60

152.4

6

71.4

2 13/16

9150 or 9450

144.5

2.84:1

NC44-62

158.8

6 1/4

57.2

2 1/4

9150 or 9450

149.2

2.91:1

NC46-62

158.8

6 1/4

71.4

2 13/16

9150 or 9450

150.0

2.63:1

NC46-65

165.1

6 1/2

57.2

2 1/4

9150 or 9450

154.8

2.76:1

NC46-65

165.1

6 1/2

71.4

2 13/16

9150 or 9450

154.8

3.05:1

NC46-67

171.4

6 3/4

57.2

2 1/4

9150 or 9450

159.5

3.18:1

NC50-67

171.4

6 3/4

71.4

2 13/16

9150 or 9450

159.5

2.37:1

NC50-70

177.8

7

57.2

2 1/4

9150 or 9450

164.7

2.54:1

NC50-70

177.8

7

71.4

2 13/16

9150 or 9450

164.7

2.73:1

NC50-72

184.2

7 1/4

71.4

2 13/16

9150 or 9450

169.5

3.12:1

NC56-77

196.8

7 3/4

71.4

2 13/16

9150 or 9450

185.3

2.70:1

NC56-80

203.2

8

71.4

2 13/16

9150 or 9450

190.1

3.02:1

6 5/8REG

209.6

8 1/4

71.4

2 13/16

9150 or 9450

195.7

2.93:1

NC61-90

228.6

9

71.4

2 13/16

9150 or 9450

212.7

3.17:1

7 5/8REG

241.3

9 1/2

76.2

3

9150 or 9450

223.8

2.81:1

NC70-97

247.6

9 3/4

76.2

3

9150 or 9450

232.6

2.57:1

NC70-100

254.0

10

76.2

3

9150 or 9450

237.3

2.81:1

8 5/8REG

279.4

11

76.2

3

9150 or 9450

266.7

2.84:1

Mechanical property for drill collar

Range for outer diameter

σ0.2

yield intensity

MPa

σb

tensile intensity

MPa

δ4

elongation

%

HB

Brinell

Hardness

Ak

Impact Value

J

mm

in

79.4~171.4

3 1/8~6 3/4

≥758

≥965

≥13

≥285

≥54

177.8~279.4

7~11

≥689

≥930

Tolerance for drill collar

O.D.

O.D. Tolerance

I.D.Tolerance

Length

DF

mm

in

≤88.9

≤3 1/2

+1.2

0

+1.6

0

±152.4

±0.4

>88.9~114.3

>3 1/2~4 1/2

+1.6

0

>114.3~139.7

>4 1/2~5 1/2

+2.0

0

>139.7~165.1

>5 1/2~6 1/2

+3.2

0

>165.1~215.9

>6 1/2~8 1/2

+4.0

0

>215.9~241.3

>8 1/2~9 1/2

+4.8

0

>241.3

>9 1/2

+6.4

0

 

Stress tress –relief slot for connection

Style

Lx

±1.59

mm

Dcb

+0.40

-0

mm

±20.83

mm/m

DRC

+0

-0.79

mm

LRG

+0

<, P class=MsoNormal style="TEXT-ALIGN: center;"urn:schemas-microsoft-com:office:smarttags" />335.25pt" align=center>-3.18

mm

NC35

82.6

82.15

166.67

82.15

85.73

NC38

88.9

88.11

166.67

89.10

92.08

NC40

101.6

92.87

166.67

95.81

104.78

NC44

101.6

101.60

166.67

106.36

104.78

NC46

101.6

106.76

166.67

109.93

104.78

NC50

101.6

117.48

166.67

120.45

104.78

NC56

114.3

121.84

250.00

134.04

117.48

NC61

127.0

132.95

Specifications︰The drill collar, mainly used for providing drill pressure, is manufactured in accordance with API Spec 7 and API RP 7G. The material of standard drill collar is AISI 41545H. Trace elements such as sulfur and phosphorus are reduced during the steel making process, thus making the material get high physical properties.
Nonmagnetic drill collar is made from chrome manganese, low carbon austenitic alloy obtained by combining a proprietary chemical analysis and a rotary hammer forging process. The material is resistant to stress corrosion cracking, with high mechanical properties, low magnetic permeability, excellent mechanical machining properties and no tendency to galling.
Product type
● Standard drill collar
● Special spiral collar
● Standard nonmagnetic drill collar
Notes: ①We can supply drill collar with other outside and inside diameters according to customers’ requirements;
 ② We can supply drill collar made from other standard material, e.g. AISI 4145HM or AISI 4145M;
 ③ The premium thread connection such as PAC is available.
● When ordering or inquiring, please specify:
 ● Outside and inside diameter
 ● Length and tolerance
 ● Size, type and location of connections
 ● Type of thread protectors
 ● Slip and elevator recess (up to API RP 7G)
 ● Spiral grooves
 ● Stress relief groove
 ● Other special requirements (magnets, special mark, etc)
● Other nonmagnetic products are also available including short drill collar, integral HWDP, sub and stabilizer.
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