Tubing and Casing Coupling

Short Description:


  • Keywords: Casing and Tubing Coupling, Casing Coupling, Tubing Coupling
  • Type: API 5CT Tubing Couplings, API 5CT Casing Couplings
  • Size: Tubing Coupling : 1.9'' - 4-1/2'',Casing Couping : 4-1/2'' - 13-3/8''
  • Thread Type: NUE/EUE/STC/LTC/BTC
  • Grade: J55, L80, N80 & P110
  • Standard: API 5CT and 5B PSL1/PSL2 J55,K55,N80-1,N80-Q, API 5CT and 5B L80-1,C90, C95,T95, P110, Q125
  • Surface Treatment : phosphating treatment
  • Color Code: J55 Green,L80 Red with brown strips,N80 Red with green strips,P110 White
  • Description

    Specification

    Standards

    Process

    Packing

    Casing coupling is a short pipe applied in connecting two casing pipes which have threads. The pipe coupling has internal threads machined to match the external thread of the long joints of casing. The two joints of casing pipes are screwed into opposite ends of the casing coupling. Through their strength can be normally made of the same grade of steel as the casing. All casing couplings are manufactured in accordance with API 5CT specification of the latest edition.

    Properties of Casing Couplings:
    ♦ The material of casing couplings is H40, J55, K55, M65, N80-1, N80Q, L80, C95, T95 and P110 grade steel with high quality and good performance;
    ♦ The outer diameter ranges from 127mm to 365.12 mm;
    ♦ The casing couplings thread patterns include short round thread, long round thread and buttress thread.

    Tubing coupling is a kind of drilling tool available in oil field. Tubing couplings are mainly used in connecting oil pipes. This type of pipe coupling has handled the problem that the existing couplings tend to crack because of stress concentration. The oil pipe ends and the inner wall of the tubing coupling are connected by threads. And the oil pipes and the ends of the tubing coupling have the same type of threads. It is not easy to crack for this type of connection and the connection effect is good. The tubing coupling can avoid the oil well string dropout accident effectively.

    Properties of Tubing Coupling:
    ♦ The material of tubing couplings is H40, J55, N80-1, N80Q, L80, C90, T95 and P110 grade steel with high quality and good performance;
    ♦ It is mainly used to connect two oil pipes;
    ♦ The tubing coupling thread patterns include non-upset thread and upset thread;
    ♦ The outer diameter of tubing coupling ranges from 55.88 mm to 141.3 mm;

    API Tubing Coupling

    Specification
    Size (Pipe OD) (in) 1.900, 2-3/8, 2-7/8, 3-1/2, 4, 4-1/2
    Upset Non UpsetExternal Upset
    Grade J-55, C-75, L-80, N-80, C-95, P-110
    Option Electro-zinc platedPhosphorised

    API Casing Coupling

    Specification
    Size (Pipe OD) (in) 4-1/2, 5, 5-1/2, 6-5/8, 7, 7-5/8, 8-5/8, 9-5/8, 10-3/4, 11-3/4, 13-3/8, 16, 18-5/8, 20
    Threading Short Round-Thread Casing (STC)Long Round-Thread Casing (LC)

    Buttress Thread Casing (BC)

    Grade H-40, J-55, K-55, C-75, L-80, N-80, C-95, AS-95, P-110, L80-13CR

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  • API Tubing Coupling

    Descriptions and size Type of Thread O.D*L Weight
    (mm) (kg)
    Tubing Coupling 1.05 NUE 33.35*80.96 0.23
    1.05 EUE 42.16*82.55 0.38
    1.315 NUE 42.16*82.55 0.38
    1.315 EUE 48.26*88.90 0.57
    1.66 NUE 52.17*88.90 0.59
    1.66 EUE 58.88*95.25 0.68
    1.9 NUE 55.88*95.25 0.56
    1.9 EUE 63.50*98.42 0.84
    2-3/8″ NUE 73.02*107.95 1.28
    2-3/8″ EUE 77.80*132.82 1.55
    2-7/8″ NUE 88.90*130.18 2.34
    2-7/8″ EUE 93.17*133.35 2.4
    3-1/2″ NUE 107.95*142.88 3.71
    3-1/2″ EUE 114.30*146.05 4.1
    4″ NUE 120.65*146.05 4.35
    4″ EUE 127.00*152.40 4.82
    4-1/2″ NUE 132.08*155.58 4.89
    4-1/2″ EUE 141.30*158.75 6.05

     

    API Casing Coupling

    Descriptions and size

    Type of Thread

    O.D*L

    Weight

    (mm)

    (kg)

    Casing Coupling

    4-1/2″

    STC

    127.00*158.75

    5.23

    4-1/2″

    LTC

    127.00*177.80

    4.15

    4-1/2″

    BTC

    127.00*225.42

    4.55

    5″

    STC

    141.30*165.10

    4.66

    5″

    LTC

    141.30*196.85

    5.75

    5″

    BTC

    141.30*231.78

    5.85

    5-1/2″

    STC

    153.67*171.45

    5.23

    5-1/2″

    LTC

    153.67*203.20

    6.42

    5-1/2″

    BTC

    153.67*234.95

    6.36

    6-5/8″

    STC

    187.71*184.15

    9.12

    6-5/8″

    LTC

    187.71*222.25

    11.34

    6-5/8″

    BTC

    187.71*244.48

    11.01

    7″

    STC

    194.46*184.15

    8.39

    7″

    LTC

    194.46*228.60

    10.83

    7″

    BTC

    194.46*254.00

    10.54

    7-5/8″

    STC

    215.90*190.50

    12.3

    7-5/8″

    LTC

    215.90*234.95

    15.63

    7-5/8″

    BTC

    215.90*263.52

    15.82

    8-5/8″

    STC

    244.48*196.85

    16.23

    8-5/8″

    LTC

    244.48*254.00

    21.67

    8-5/8″

    BTC

    244.48*269.88

    20.86

    9-5/8″

    STC

    269.88*196.85

    18.03

    9-5/8″

    LTC

    269.88*266.70

    25.45

    9-5/8″

    BTC

    269.88*269.88

    23.16

    10-3/4″

    STC

    298.45*203.20

    20.78

    10-3/4″

    BTC

    298.45*269.88

    25.74

    11-3/4′

    STC

    323.85*203.20

    22.64

    11-3/4′

    BTC

    323.85*269.88

    28.03

    13-3/8″

    STC

    365.12*203.20

    25.66

    13-3/8″

    BTC

    365.12*269.88

    31.77

    16″

    STC

    431.80*228.6

    34.91

    16″

    BTC

    431.80*269.88

    40.28

    18-5/8″

    STC

    508.00*228.60

    51.01

    18-5/8″

    BTC

    508.00*269.88

    62.68

    20″

    STC

    533.40*228.6

    43.42

    20″

    LTC

    533.4*292.10

    57.04

    20″

    BTC

    533.40*269.88

    50.1

    Applicable standards:
    API 5CT material for body;
    API 5B for API threads;
    Premium thread per licensor specifications

    Main Technical parameters

     Couplings

    Size in

    Max. OD in(mm)

    Min length in(mm)

    Grade

    NU

    EU

    NU

    EU

    23/8

    2.875(73.03)

    3.063(77.80)

    41/4(107.95)

    47/8(123.83)

    J55

    N80
    L80

     

    27/8

    3.500(88.90)

    3.668(93.20)

    51/8(130.18)

    51/4(133.35)

     

    31/2

    4.250(108.00)

    4.500(114.30)

    55/8(142.88)

    53/4(146.05)

    Crossovers

    J55,N80,L80                All kinds of crossovers, connections and sub-couplings of grades J55, N80 and L80

    COUPLING PIPE GRADE IDENTIFICATION BY PAINT COLOR

    According to API 5CT standards, Oil casing and Tubing couplings should be painted one by one to distinguish different grades of steel. The color label of the oil casing and Tubing should be sprayed at any end 600mm, and the color should be painted on the whole outer surface, and then the color ring should be sprayed.

                                                   Coupling colour code
    Grade Grade Type Colour(s) for Coupling Number andcolour of bands

    for product

    Picture
    EntireCoupling Band(s)
    H40 None Same as for pipe None/black band at the manufacturer’s option image
    J55 Tubing Bright Green None One Bright Green image
    J55 Casing Bright Green One White One Bright Green image
    K55 Bright Green None Two Bright Green image
    M65 M65Pipe uses L80Type 1Couplings One Bright GreenOne Blue image
    N80 1 Red None One Red image
    N80 Q Red One Green One RedOne Bright Green  image
    R95 Brown None One Brown image
    L80 1 Red One Brown One RedOne Brown image
    L80 9Cr None Two Yellow One Red,One Brown,

    Two Yellow

      image
    L80 13Cr None One Yellow One Red,One Brown,

    One Yellow

    image
    C90 1 Purple None One Purple  image
    T95 1 Silver None One Silver image
    C110 White Two Brown One White,Two Brown image
    P110 White None One White image
    Q125 Orange None One Orange   image

    coupling process

    Package