Henan Shenlong Petroleum Drilling Tools Co.,Ltd

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  product >> Non Magnetic Drill Collar

 

NON MAGNETIC DRILL COLLAR / FLEX COLLAR

Non magnetic drilling tools of Henan Shenlong Petroleum Drilling Tools include Non Magntic Drill Collar/Flex Collar, Stabilizer, MWD components etc.

The material is high purity austenitic stainless steel.

Strict control of chemical composition and special forging process guarantee the excellent mechanical properties of Shenlong's non magnetic drilling tools.

Corrosion resistance rerequirements:Shenlong's all non magnetic produsts can pass the corrosion test specified in ASTM A 262 Practice E.

Non Magnetic Properties:
Relative Permeability: Max 1.005
Hot Spot / Field Gradient:MAX ±0.05μT

Specail Treatment on ID: Roller Burnishing.
(After roller burnishing,a compressive layer come into being),
Advantages are as following:
Increase the corrosion resistance properties;
Increase the surface hardness of bore up to HB400;
Increase surface finish of bore to Ra≤3.2 μm

Test and Inspection carried out on each bar during production of NMDC, Stabilizer and MWD parts:
Chemical Composition;
Tensile Test;
Impact Test;
Hardness Test;
Metallographic Test (Grain Size);
Corrosion Test (According to ASTM A 262 Practice E);
Ultrasonic Test over the whole length of the bar (According to ASTM A 388);
Relative maganetic permeability Test;
Hot spot Test
Dimensional Inspection
Etc

 

Specification of non magnetic drill collars

Drill collar

number

and

connection

label

Outside

diameter

 

D

in

 

Bore

 

d

in

+1/16

0

 

Length

 

L

Ft

+6

0

Bevel

diameter

 

DF

in

±1/64 in

Reference

bending strength

ratio

 

BSR

NC23-31

3 1/8

1 1/4

30

3

2.57:1

NC26-35

3 1/2

1 1/2

30

3 17/64

2.42:1

NC31-41

4 1/8

2

30 or 31

3 61/64

2.43:1

NC35-47

4 3/4

2

30 or 31

4 33/64

2.58:1

NC38-50

5

2 1/4

30 or 31

4 49/64

2.38:1

NC44-60

6

2 1/4

30 or 31

5 11/16

2.49:1

NC44-60

6

2 13/16

30 or 31

5 11/16

2.84:1

NC44-62

6 1/4

2 1/4

30 or 31

5 7/8

2.91:1

NC46-62

6 1/4

2 13/16

30 or 31

5 29/32

2.63:1

NC46-65

6 1/2

2 1/4

30 or 31

6 3/32

2.76:1

NC46-65

6 1/2

2 13/16

30 or 31

6 3/32

3.05:1

NC46-67

6 3/4

2 1/4

30 or 31

6 9/32

3.18:1

NC50-70

7

2 1/4

30 or 31

6 31/64

2.54:1

NC50-70

7

2 13/16

30 or 31

6 31/64

2.73:1

NC50-72

7 1/4

2 13/16

30 or 31

6 43/64

3.12:1

NC56-77

7 3/4

2 13/16

30 or 31

7 19/64

2.70:1

NC56-80

8

2 13/16

30 or 31

7 31/64

3.02:1

6 5/8 REG

8 1/4

2 13/16

30 or 31

7 45/64

2.93:1

NC61-90

9

2 13/16

30 or 31

8 3/8

3.17:1

7 5/8 REG

9 1/2

3

30 or 31

8 13/16

2.81:1

NC70-97

9 3/4

3

30 or 31

9 5/32

2.57:1

NC70-100

10

3

30 or 31

9 11/32

2.81:1

8 5/8 REG

11

3

30 or 31

10 1/2

2.84:1

 

 

 

 Mechanical Properties

Steel

Grade

OD Range

in

Yield Strength

Rt

Tensile Strength

Rm

Elongation

A

(%)

Impact Value

Akv

Hardness Brinell

(HB)

Mpa

ksi

Mpa

ksi

SLW-1

3 1/8 through 6 7/8

≥758

≥110

≥827

≥120

≥25

≥150 longitudinal

285-360

7 through 11

≥689

≥100

SLW-2

3 1/8 through 6 7/8

≥827

≥120

≥896

≥130

≥25

≥150 longitudinal

285-360

7 through 11

≥758

≥110

SLW-3

3 1/8 through 6 7/8

≥965

≥140

≥1034

≥150

≥20

≥90 longitudinal

330-400

7 through 11

≥896

≥130

SLW-4

3 1/8 through 6 7/8

≥827

≥120

≥896

≥130

≥20

≥75 longitudinal

285-360

7 through 11

≥758

≥110

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Non-magnetic Drill collar      Drill collar

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