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  1. Unionlever (Group) Petroleum Equipment Co.,Ltd.

    NON MAGNETIC DRILL COLLAR (NMDC)
       

     

    NON MAGNETIC DRILL COLLAR / FLEX COLLAR

    Non magnetic 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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