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Drill Collars

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  • Drill collars are thick-walled tubulars that are used at the bottom of the drill string
  • Drill collars are thick-walled tubulars that are used at the bottom of the drill string
  • Drill collars are thick-walled tubulars that are used at the bottom of the drill string
  • Drill collars are thick-walled tubulars that are used at the bottom of the drill string

Short Description:


  • Product: Drill Collar, Spiral Drill Collar, OCTG Drill Collars, 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
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    Description

    Specifications

    Standards

    Process

    Packing

    Drill collar as one component of a drill string is extremely industrial tubulars used to drill into ground to provides weight on bit for drilling. It is used to conjunction with drill pipe. There are slick and spiral grooved types mainly. Our manufacturing process is certified to API spec 7-1. The drill collar is made of AISI 4145 H or 4145 H Modified alloy steel. Bores are trepanned from one direction with no mismatch. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe.

    Non-magnetic drill collars offer strength and hardness while preventing magnetic interference that may impair accuracy of magnetic surveys. It is manufactured from special steel material with low permeability, high mechanical properties and superior resistance to corrosion cracking.

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    • We supply slick drill collars, spiral drill collars and non-magnetic drill collars; their sizes are from 3-1/8 to 11 inches. Besides the drill collars in the table below, we can supply other drill collars at customers’ request.

    Item

    Name

    Spiral or Slick

    O.D

    I.D

    Tool joint

    Bevel diameter in

    Material

    Overall length

    in

    in

    Connection

    ft
    1 Drill collar Slick or Spiral 3.1/8 1.1/4 NC26 2.3/8″IF 3 4145H 30 or 31
    2 Drill collar Slick or Spiral 3.1/2 1.1/2 NC26 2.3/8″IF 4145H 30 or 31
    3 Drill collar Slick or Spiral 4.1/8 2 NC31-41 2.7/8″IF 3.61/64 4145H 30 or 31
    4 Drill collar Slick or Spiral 4.3/4 2 NC35-47 4.33/64 4145H 30 or 31
    5 Drill collar Slick or Spiral 5 2.1/4 NC38-50 3.1/2″IF 4.49/64 4145H 30 or 31
    6 Drill collar Slick or Spiral 6 2.1/4 NC44-60 5.11/16 4145H 30 or 31
    7 Drill collar Slick or Spiral 6 2.13/16 NC44-60 5.11/16 4145H 30 or 31
    8 Drill collar Slick or Spiral 6.1/4 2.1/4 NC44-62 5.7/8 4145H 30 or 31
    9 Drill collar Slick or Spiral 6.1/4 2.13/16 NC46-62 4″IF 5.29/32 4145H 30 or 31
    10 Drill collar Slick or Spiral 6.1/2 2.1/4 NC46-65 4″IF 6.3/32 4145H 30 or 31
    11 Drill collar Slick or Spiral 6.1/2 2.13/16 NC46-65 4″IF 6.3/32 4145H 30 or 31
    12 Drill collar Slick or Spiral 6.3/4 2.1/4 NC46-67 4″IF 6.9/32 4145H 30 or 31
    13 Drill collar Slick or Spiral 7 2.1/4 NC50-70 4.1/2″IF 6.31/64 4145H 30 or 31
    14 Drill collar Slick or Spiral 7 2.13/16 NC50-70 4.1/2″IF 6.31/64 4145H 30 or 31
    15 Drill collar Slick or Spiral 7.1/4 2.13/16 NC50-72 4.1/2″IF 6.43/64 4145H 30 or 31
    16 Drill collar Slick or Spiral 7.3/4 2.13/16 NC56-77 7.19/64 4145H 30 or 31
    17 Drill collar Slick or Spiral 8 2.13/16 NC56-80 7.31/64 4145H 30 or 31
    18 Drill collar Slick or Spiral 8.1/4 2.13/16 6.5/8″REG 7.45/64 4145H 30 or 31
    19 Drill collar Slick or Spiral 9 2.13/16 NC61-90 8.3/8 4145H 30 or 31
    20 Drill collar Slick or Spiral 9.1/2 3 7.5/8″REG 8.13/16 4145H 30 or 31
    21 Drill collar Slick or Spiral 9.3/4 3 NC70-97 9.5/32 4145H 30 or 31
    22 Drill collar Slick or Spiral 10 3 NC70-100 9.11/32 4145H 30 or 31
    23 Drill collar Slick or Spiral 11 3 8.5/8″REG 10.1/2 4145H 30 or 31
    Note: If the cliente has any special requerimente, for example compound,cold rolling,make and break,hard banding (ARNCO 100XT ARNCO 300XT etc), internal coating (TK34 TK34PTC2000, etc),Stress- Relief Pin, Bored  Back Box,Elevator Recess, slip Recess please feel free to contact us.

     

    Non-Magetic Drill Collar

    Grade

    Minimum Tensile Strength

    psi

    Mpa

    1

    90000

    621

    2

    9000

    621

    3

    115000

    793
    **Non-magetic drill collar can be customized as per customer’s design. The size please refer to the sizes of drill collar.

     

    Spiral Drill Collar

    OD (in)

    4 3/4

    6 1/4

    6 3/4

    7 1/4

    7 1/2

    8

    9 1/2

    10

    11

    Depth of Cut (in)

    7/32

    ±1/32

    9/32

    ±1/16

    5/16

    ±1/16

    11/32

    ±1/16

    11/32

    ±1/16

    3/8

    ±1/16

    13/32

    ±3/32

    7/16

    ±3/32

    15/32

    ±3/32

    Spiral Pitch (in)

    38

    ±1

    42

    ±1

    46

    ±1

    64

    ±1

    64

    ±1

    68

    ±1

    72

    ±1

    76

    ±1

    80

    ±1
    ** Drill collar can be customized as per customer’s design.

    Drill collars are an integral heavy duty joint that are constructed from a solid bar of AISI 4145H modified alloy steel.? Our standard drill collars are supplied with an “as rolled” surface finish condition.? All standard bars receive heat-treatment that provides them with the necessary mechanical properties.
    The bars are then trepanned and drifted.? All of our drill collars are manufactured in
    accordance with API spec 7, Q1 and recommended practice 7G, as applicable.

    Standard Sizes, Bores, and Connections

    Drill Collar
    Conn. Size & Type    		 Min.
    OD    		 Bore Length Bending Strength
    Ratio***    		 Drill Collar
    Wt.
    (in.) (in.) (ft.) (lb.)
    NC 26 (2-3/8 IF)

    3-1/2

    		 1-1/2 30 2.42:1 801
    NC 31 (2-7/8 IF) 4-1/8 2 30 2.43:1 1041
    NC 38 (3-1/2 IF) 4-3/4 2-1/4 31 1.85:1 1451
    NC 38 (3-1/2 IF) 5 2-1/4 31 2.38:1 1652
    NC 44 6 2-1/4 31 2.49:1 2561
    NC 44 6 2-13/16 31 2.84:1 2353
    NC 44 6-1/4 2-1/4 31 2.91:1 2806
    NC 46 (4 IF) 6-1/4 2-13/16 31 2.63:1 2598
    NC 46 (4 IF) 6-1/2 2-1/4 31 2.76:1 3085
    NC 46 (4 IF) 6-1/2 2-13/16 31 3.05:1 2877
    NC 46 (4 IF) 6-3/4 2-1/4 31 3.18:1 3364
    NC 50 (4-1/2 IF) 7 2-1/4 31 2.54:1 3643
    NC 50 (4-1/2 IF) 7 2-13/16 31 2.73:1 3434
    NC 50 (4-1/2 IF) 7-1/4 2-13/16 31 3.12:1 3714
    NC 56 8 2-13/16 31 3.02:1 4675
    6-5/8 REG. 8 2-13/16 31 2.60:1 4675
    6-5/8 REG. 8-1/4 2-13/16 31 2.93:1 5016
    7-5/8 REG. 9-1/2 3 31 2.81:1 6727
    7-5/8 REG.** 9-3/4 3 31 3.09:1 7130
    8-5/8 REG.** 11 3 30 2.78:1 8970
    ** Low torque face
    *** Ratio of box to pin section modulus – See API RP7G for details
    Note: Other sizes and connections are available as well as any other optional features listed

     

    Mechanical Property
    TTT

    Yield strength 0.2Mpa

    Tensile strength b Mpa

    Elongation 4%

    Hardness(Brinell)

    IMPACT VALUE(CHAPPY-V)
    mm

    in inch
    79.4-171.4

    3 1/8-6 3/4

    ≥ 758

    ≥ 965

    ≥ 13

    285-341

    ≥ 54
    177.8-279.4

    7-11

    ≥ 689

    DRILL COLLAR7

    process

    Hot-and-Cold-Finished-Tubes-Pipes-Package