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Contact us:

Company name: TianJin Shiruida Machinery Import & Export Co., Ltd

Main products: Petroleum machinery and Petroleum mechanical fittings

Business nature: Joint stock company

Tel: 0086.22.24716021  24716013   24716017 

Fax: 0086.22.24716023

Address: East15#,Chengfa Industrial zone,Xuelian South Road,Hedong District,Tianjin,China

Zip code:300185

Website: http://www.shiruida.cn       http://www.shiruida.com         

E-mailinfo@shiruida.com     sales@shiruida.com      

admin@shiruida.com

 

 

   

 

Link:
http://www.adcbuae.com
               Normal Drill collars

 

Normal Drill Collars

Material Selected
The collars are made of AISI 4145H forging or finish rolling alloy structural steel.


Processing and thermal treatment of the pipe hole
The drill collar are trepanned and drifted to API Spec 7. Grinding crafts adopted finish boring technology eliminates regions of the weld stress concentration, making welding appearance more perfect, and increases their life. The full length thermal treatment ensure the mechanical performances fullfil even exceed API Spec 7 requirements. Its brinell hardness ranges from 285 to 341, moreover, charpy “v” notch minimum impact strength of 40 ft-lb at 70℃ are guaranteed one inch below the surface. 


Traceability
From receipt of mill’s certified raw material to the completion of all the processing, in each process of which complete traceablity mechanism workcraft. Serial numbers are die stamped on bar bodies.

Routine and strict inspection procedures
All our drill collars are inspected to comply with the API standards. These inspections include fluorescent magnetic-particle detection and inner ultrasonic flaw detection and hardness detection over the entire body of the drill collar as well as other mechanical performance detection.


Cold rolling process
The thread roots, as well as the elevator recess, shall be cold-rolled. Cold rolling creates such a compressive upper radius stress that increases fatigue resistance by minimizing crack initiation.


Phosphate-coated or copper plating
All connections shall undergo phosphate-coated or copper plating process to ensure corrosion resistance, so as to avoid galled thread.


Slip groove, elevator groove and size
Our company offers optional slip and elevate and accepts reprocesses orders,  improving the handling efficiency and guarantee safety. Unless special specification is required, slip and elevator are processed in compliance with API rp 7G guidelines.


Thread protectors
Steel, cast steel, and plastic steel thread protectors for the drill stem products are subject to your requirements.


Standard size for drill collars

Drill collar number

Outside dia.

Inside diameter

Length

Bevel dia.

Ref.bending strength ratio

mm

in

mm

in

NC23-31

79.4

31/8

31.8

11/4

9150

76.2

2.571

NC26-35    2 3/8

88.9

31/2

38.1

11/2

9150

82.9

2.421

NC31-41    2 7/8

104.8

41/8

50.8

2

9150

100.4

2.431

NC35-47

120.7

43/4

50.8

2

9150

114.7

2.581

NC38-50

127.0

5

57.2

21/4

9150

121.0

2.381

NC44-60

152.4

6

57.2

21/4

9150 or 9450

144.5

2.491

NC44-60

152.4

6

71.4

213/16

9150 or 9450

144.5

2.841

NC44-62

158.8

61/4

57.2

21/4

9150 or 9450

149.2

2.911

NC46-6241F

158.8

61/4

71.4

213/16

9150 or 9450

150.0

2.631

NC46-6541F

165.1

61/2

57.2

21/4

9150 or 9450

154.8

2.761

NC46-6541F

165.1

61/2

71.4

213/16

9150 or 9450

154.8

3.051

NC46-6741F

171.4

63/4

57.2

21/4

9150 or 9450

159.5

3.181

NC50-67

171.4

63/4

71.4

213/16

9150 or 9450

159.5

2.371

NC50-70

177.8

7

57.2

21/4

9150 or 9450

164.7

2.541

NC50-70

177.8

7

71.4

213/16

9150 or 9450

164.7

2.731

NC50-72

184.2

71/4

71.4

213/16

9150(or) 9450

169.5

3.121

NC56-77

196.8

73/4

71.4

213/16

9150 or 9450

185.3

2.701

NC50-80

203.2

8

71.4

213/16

9150(or) 9450

190.1

3.021

6 5/8REG

209.6

81/4

71.4

213/16

9150 or 9450

195.7

2.931

NC61-90

228.6

9

71.4

213/16

9150 or 9450

212.7

3.171

7 5/8 REG

241.3

91/2

76.2

3

9150 or 9450

223.8

2.811

NC70-97

247.6

93/4

76.2

3

9150 or 9450

232.6

2.571

NC70-100

254.0

10

76.2

3

9150 or 9450

237.3

2.811

8 5/8REG

279.4

11

76.2

3

9150 or 9450

266.7

2.841

 

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