SHINESTAR STEEL GROUP CO., LTD

盛仕达钢铁股份有限公司

Drill Collar

Short Description:


  • Keywords: Drill Collar, Spiral Drill Collar, Non-Magnetic Drill Collar, Steel Drill Collar
  • Standard: API SPEC 7-1
  • Steel Grade: AISI 4145H
  • Sizes: 3 1/8" -- 11"
  • Connected Type: NC, IF, REG
  • Length: 30 – 31 ft ± 6 ft.
  • Type of Design: (1)Plain;(2) With A Recess of the Elevator; (3) With A Recess of the Elevator and Power Slips; (4) Spiral and A Wide Range of Type Mixtures.
  • Product Detail

    Spcifications

    Standards

    Process

    Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit so as to produce sufficient force for the drill bit to break rock efficiently while drilling. They are made of AISI 4145H modified steel and are connected between drill pipes and drill bits.

     

    Drill collars come in 30 or 31 foot lengths and are furnished as slick (as-rolled surface finish) or spiraled. Spiraled drill collars have grooves on its external surface which maintains an even flow of drilling fluid around the collar to equalize pressure and reduce differential-sticking of the collar to the wall of the oilwell.

     

    Our drill collar connections comply with dimensional requirements specified in API Spec. 7/7-1 and guidelines presented in API RP7G. Drill collars also come with slip and elevator recesses for safe and efficient handling. Slip and elevator recesses can be used together or separately and are machined in compliance with API RP7G guidelines unless otherwise specified.

     

    NON-MAGNETIC DRILL COLLARS

    TECHNICAL SUMMARY

    As you drill in areas closer to the earth's magnetic poles, it is essential to use a non-magnetic drill collar. Our non-mag drill collars offer strength and hardness while neutralizing magnetic inference. Compatible with standard drill string tools and stabilizers, our non mag drill collars are manufactured to API Spec 7-1. Inventory includes:

    (1)Slick

    (2)Flex

    (3)Spiral

    (4)Pony

    We treat our non-mag material ID with a shot peening operation to compress the inside diameter which prevents stress corrosion while drilling in H2S environments.

    Resistant to stress corrosion in sour gas environments

    Compatible with standard drill string tools and stablizers

    Spiraling available on request

    Used to add weight to the bit and stiffness to bottom hole assembly, our Drill Collars are an invaluable downhole tool.

     

    STEEL DRILL COLLARS

    To keep you drilling in the right direction, run our Drill Collars in combination with our Stabilizers to resist bucking. Manufactured from an AISI 4145H modified heat treated alloy steel, our strict quality assurance guidelines assure metallurgical integrity of each and every bar.

    Our Drill Collar bars are batch or continuous line heat treated and have both cold-worked and Phosphate coated connections.


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  • NON-MAGNETIC DRILL COLLARS

    Common Connections

    OD (in)

    ID (in)

    Approx Weight (lbs)

    2 7/8 REG

    3 1/2 to 3 7/8

    1 1/4 to 1 3/4

    760-1114

    3 1/2 REG

    4 1/8 to 4 1/2

    1 1/4 to 2 1/4

    989-1490

    3 1/2 IF NC38

    4 3/4 to 5 1/2

    1 3/4 to 2 13/16

    1350-2250

    4 FH NC40

    5 to 6

    1 3/4 to 2 13/16

    1552-2726

    4 1/2 FH

    5 1/2 to 6 1/2

    2 to 3

    1759-3166

    4 1/2 XH NC46

    5 3/4 to 6 3/4

    2 1/4 to 3

    1992-3352

    4 1/2 IF NC50

    6 1/4 to 7 1/2

    2 1/4 to 3 1/4

    2359-4237

    5 1/2 FH NC56

    7 to 7 3/4

    2 1/4 to 3 1/4

    3182-4552

    6 5/8 REG

    7 1/4 to 8

    2 1/2 to 3 1/4

    3476-4780

    6 5/8 FH

    7 1/2 to 8 1/4

    2 1/2 to 3 1/4

    3782-5116

    7 5/8 REG

    8 1/2 to 9 1/2

    2 1/2 to 3 3/4

    4816-6953

    STEEL DRILL COLLARS

    O.D. (in)

    I.D. (in)

    Weight in Air (lbs)

    Unit Weight (lbs/ft)

    Standard End Connections

    3 1/2

    1 1/2

    826.8

    26.7

    NC-26 thru 35

    4 1/8

    2

    1076.2

    34

    NC-31 thru 41

    4 3/4

    2 1/4

    1447.0

    46.7

    NC-38 thru 47

    5

    2 1/4

    1648.5

    53.2

    NC-38 thru 50

    6

    2 1/4

    2558.0

    82.5

    NC-44 thru 60

    6

    2 13/16

    2322.3

    74.9

    NC-44 thru 60

    6 1/4

    2 1/4

    2811.2

    90.7

    NC-44 thru 62

    6 1/4

    2 13/16

    2575.6

    83.1

    NC-46 thru 65

    6 1/2

    2 1/4

    3074.8

    99.2

    NC-46 thru 65

    6 1/2

    2 13/16

    2839.1

    91.6

    NC-46 thru 65

    6 3/4

    2 1/4

    3348.7

    108.0

    NC-46 thru 67

    7

    2 1/4

    3632.9

    117.2

    NC-50 thru 70

    7

    2 13/16

    3397.2

    109.6

    NC-50 thru 70

    7 1/4

    2 13/16

    3691.8

    119.1

    NC-50 thru 72

    8

    2 13/16

    4637.5

    149.6

    6 5/8 Regular

    8 1/4

    2 13/16

    4973.4

    160.4

    6 5/8 Regular

    9 1/2*

    3

    6718.0

    216.7

    7 5/8 Regular

    9 3/4*

    3

    7116.0

    229.5

    7 5/8 Regular

    11*

    3

    9260.6

    298.7

    8 5/8 Regular

    RECOMMENDED SLIP AND ELEVATOR RECESS DIAMETERS FOR DRILL COLLARS

    Standard

    Number

    OD
    (in.)

    ID
    (in.)

    Length
    (ft)

    Weight
    (lb/ft)

    Typical Bending
    Strength Ratio

    SY5144-2007/API7-1

    NC 23-31

    3-1/8

    1-1/4

    30

    22

    2.57:1

    NC 26-35 (2-3/8 IF)

    3-1/2

    1-1/2

    30

    27

    2.42:1

    NC 31-41 (2-7/8 IF)

    4-1/8

    2

    30 or 31

    34

    2.43:1

    NC 35-47

    4-3 /4

    2

    30 or 31

    47

    2.58:1

    NC 38-50 (3-1/2 IF)

    5

    2-1/4

    30 or 31

    54

    2.38:1

    NC 44-60

    6

    2-1/4

    30 or 31

    83

    2.49:1

    NC 44-60

    6

    2-13 /16

    30 or 31

    76

    2.84:1

    NC 44-62

    6-1/4

    2-1/4

    30 or 31

    91

    2.91:1

    NC 46-62 (4 IF)

    6-1/4

    2-13 /16

    30 or 31

    84

    2.63:1

    NC 46-65 (4 IF)

    6-1/2

    2-1/4

    30 or 31

    100

    2.76:1

    NC 46-65 (4 IF)

    6-1/2

    2-13 /16

    30 or 31

    93

    3.05:1

    NC 46-67 (4 IF)

    6-3 /4

    2-1/4

    30 or 31

    109

    3.18:1

    NC 50-70 (4-1/2 IF)

    7

    2-1/4

    30 or 31

    118

    2.54:1

    NC 50-70 (4-1/2 IF)

    7

    2-13 /16

    30 or 31

    111

    2.73:1

    NC 50-72 (4-1/2 IF)

    7-1/4

    2-13 /16

    30 or 31

    120

    3.12:1

    NC 56-77

    7-3 /4

    2-13 /16

    30 or 31

    140

    2.70:1

    NC 56-80

    8

    2-13 /16

    30 or 31

    151

    3.02:1

    6-5/8 API Reg

    8-1/4

    2-13 /16

    30 or 31

    162

    2.93:1

    NC 61-90

    9

    2-13 /16

    30 or 31

    196

    3.17:1

    7-5/8 API Reg

    9-1/2

    3

    30 or 31

    217

    2.81:1

    NC 70-97

    9-3 /4

    3

    30 or 31

    230

    2.57:1

    NC 70-100

    10

    3

    30 or 31

    243

    2.81:1

    8-5/8 API Reg

    11

    3

    30 or 31

    300

    2.84:1

     

     

    NON-MAGNETIC DRILL COLLARS

    Room Temperature. ASTM A 370

    Drill Collar OD Range

    Min. Yield Strength

    Min. Tensile Strength

    Min. Elongation %

    Impact Test CHARPY V. notch

     
     

    MPa

    PSI

    MPa

    PSI

     

    J (min.)

    ft-lbs (min.)

     

    2 3/4″ thru 3 7/8″

    827

    120 000

    896

    130 000

    16

    81

    60

     

    4″ thru 6 7/8″

    758

    110 000

    827

    120 000

    18

     

    7″ thru 11″

    689

    100 000

    758

    110 000

    20

     

    STEEL DRILL COLLARS

    Room Temperature. ASTM 4145 H Modified

    Drill Collar OD Range

    Min. Yield Strength

    Min. Tensile Strength

    Min. Elongation %

    Impact Test CHARPY V. notch

    Hardness (Brinell)

     

    MPa

    PSI

    MPa

    PSI

     

    J (min.)

    ft-lbs (min.)

    HBN

    3 1/8″ thru 6 7/8″

    758

    110 000

    965

    140 000

    13

    54

    40

    285-341

    7″ thru 11″

    689

    100 000

    930

    135 000

    process of drill collar1

    process of drill collar manufacturing2

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