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Drill Collar

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Product Detail

    Vigor Drilling is one of pioneer Downhole Drilling Stabilizers manufacturers in Oil industry. Our Downhole Drilling Stabilizers Drill Collar/Slick Drill Collar/standard Drill collar/Spiral Drill Collar/Non magnetic Drill collar/Drill collar hollow bar, all Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit for drilling and keeps the drill sting in tension. Mill test certificate conformance to API Spec. 7-1, NS-1, DS-1 and Customer requirements. Our company is the high quality drill collars manufacturers.Slick Non magnetic Drill collar/ Non magnetic Spiral Drill collar/Flex Non magnetic Drill collar, they are function as housing for the MWD tools and provide weight for drilling string.

    China Vigor’s Drill Collar/Spiral Drill Collar, materials include AISI 4145H, AISI4145H modified steel and Non-magnetic. Drill collars type they are Spiral Drill collar,Slick,Flex and with Slip and /or Elevator Recess.

    Features and Benefits:
    1. API stress relief groove pin connection; API Bore back Box Connection.
    2. Cold Rolling Thread roots—to improve fatigue resistance of connection.
    3. Phosphate coated connections- to prevent corrosion and galling upon initial make-up.
    4. A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;

    Special Features:
    1.Spiral Grooving- to avoid differential pressures sticking in the hole.
    2.Stress Relief Groove & Bore back Box
    3.Hardbanding if required.
    4.Slip and Elevator Recess-to improve downhole handling efficiency and safety.

    OD

    ID

    Length mm

    Style of connection

    		Bevel diameter 
    mm    		Bending 
    strength ratio

    mm

    in

    mm

    in

    79.4

    3 1/8

    31.8

    1 1/4

    9150

    NC23-31

    76.2

    2.57:1

    88.9

    3 1/2

    38.1

    1 1/2

    9150

    NC26-35(23/8IF)

    82.9

    2.42:1

    104.8

    4 1/8

    50.8

    2

    9150

    NC31-41(27/8IF)

    100.4

    2.43:1

    120.7

    4 3/4

    50.8

    2

    9150

    NC35-47

    114.7

    2.58:1

    127.0

    5

    57.2

    2 1/4

    9150

    NC3850(31/2IF)

    121.0

    2.38:1

    152.4

    6

    57.2

    2 1/4

    9150or9450

    NC44-60

    144.5

    2.49:1

    158.8

    6 1/4

    57.2

    2 1/4

    9150or9450

    NC44-62

    149.2

    2.91:1

    158.8

    6 1/4

    71.4

    2 13/16

    9150or9450

    NC46-62(4IF)

    150.0

    2.63:1

    165.1

    6 1/2

    57.2

    2 1/4

    9150or9450

    NC46-65(4IF)

    154.8

    2.76:1

    165.1

    6 1/2

    71.4

    2 13/16

    9150or9450

    NC46-65(4IF)

    154.8

    3.05:1

    171.4

    6 3/4

    57.2

    2 1/4

    9150or9450

    NC46-67(4IF)

    159.5

    3.18:1

    171.4

    6 3/4

    71.4

    2 13/16

    9150or9450

    NC50-67(41/2IF)

    159.5

    2.37:1

    177.8

    7

    57.2

    2 1/4

    9150or9450

    NC50-70(41/2IF)

    164.7

    2.54:1

    177.8

    7

    71.4

    2 13/16

    9150or9450

    NC50-70(41/2IF)

    164.7

    2.73:1

    184.2

    7 1/4

    71.4

    2 13/16

    9150or9450

    NC50-72(41/2IF)

    169.5

    3.12:1

    196.8

    7 3/4

    71.4

    2 13/16

    9150or9450

    NC50-77

    185.3

    2.70:1

    203.2

    8

    71.4

    2 13/16

    9150or9450

    NC50-80

    190.1

    3.02:1

    209.6

    8 1/4

    71.4

    2 13/16

    9150or9450

    6 5/8REG

    195.7

    2.93:1

    228.6

    9

    71.4

    2 13/16

    9150or9450

    NC61-90

    212.7

    3.17:1

    241.3

    9 1/2

    76.2

    3

    9150or9450

    7 5/8REG

    223.8

    2.81:1

    247.6

    9 3/4

    76.2

    3

    9150or9450

    NC70-97

    232.6

    2.57:1

    254.0

    10

    76.2

    3

    9150or9450

    NC70-100

    237.3

    2.81:1

    279.4

    11

    76.2

    3

    9150or9450

    8 5/8REG

    266.7

    2.84:1

    Mechanical Property:
    Mechanical Property of Slick and Spiral Drill Collar made of AISI 4145 H

    OD Range

    Yield

    Strength(MPa) 

    Tensile 

    Strength(MPa) 

    Elongation 

    (%) 

    Hardness 

    (HB)

    		Impact           Test(J) 

    mm

    in

    79.4-171.4

    3 1/8-6 3/4

         =758

            =965

             =13

    285~341

           =54

    177.8-279.4

    7--11

         =689

            =930

             =13

    285~341

           =54

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China Vigor Drilling Oil Tools And Equipment Co.,Ltd

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