ASTM A335/ASME SA335 steel pipe
December 15, 2017
API Spec 5CT Specification for Casing and Tubing, Chemical Requirements for casing pipe
December 30, 2017

Tubing and Casing line pipe and couplings

tubing and casing strings are the main parts of the well construction. All wells drilled for the purpose of oil or gas production (or injecting materials into underground formations) must be cased with material with sufficient strength and functionality.

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

Couplings are short lengths of pipe used to connect 2 joints of tubing or casing. They come with painted colour codes on their external surface to indicate their grades.

Borun offers a wide variety Couplings for Casing, Tubings and Line Pipes. The Tubing / Casing and Line Pipe Couplings are manufactured to meet the requirements of API 5CT and API 5L certifications respectively.

API 5CT Tubing and Casing Couplings in various sizes and grades from a 1.315”OD up to a 5.00” OD in J55/K55 and N80 and L80 grades.

API Spec 5CT casing– Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

API 5CT Tubing Coupling

Tubing SizeODCoupling Size ODLengthWeight per PiecePalletized CartonQuantityPalletized Carton Weight
InchesInchesIncheslbs
API EUE Tubing Couplings1.3151.663.250.8448804100
1.662.0543.51.2932404205
1.92.23.751.2332404010
API NUE Tubing Couplings2 3/83.0634.8753.4212484300
2 7/83.6685.255.298004260
3 1/24.55.759.024484409

Size and Specifications For Tubing and Casing Couplings:

Descriptions

and size

Type of TheradO.D*LWeightDescriptions

and size

Type of TheradO.D*LWeight
(mm)(kg)(mm)(kg)
Casing CouplingTubing Coupling
4-1/2″LTC127.00*177.804.151.05EUE42.16*82.550.38
4-1/2″BTC127.00*225.424.551.315NUE42.16*82.550.38
5″STC141.30*165.104.661.315EUE48.26*88.900.57
5″LTC141.30*196.855.751.66NUE52.17*88.900.59
5″BTC141.30*231.785.851.66EUE58.88*95.250.68
5-1/2″STC153.67*171.455.231.9NUE55.88*95.250.56
5-1/2″LTC153.67*203.206.421.9EUE63.50*98.420.84
5-1/2″BTC153.67*234.956.362-3/8″NUE73.02*107.951.28
6-5/8″STC187.71*184.159.122-3/8″EUE77.80*132.821.55
6-5/8″LTC187.71*222.2511.342-7/8″NUE88.90*130.182.34
6-5/8″BTC187.71*244.4811.012-7/8″EUE93.17*133.352.4
7″STC194.46*184.158.393-1/2″NUE107.95*142.883.71
7″LTC194.46*228.6010.833-1/2″EUE114.30*146.054.1
7″BTC194.46*254.0010.544″NUE120.65*146.054.35
7-5/8″STC215.90*190.5012.34″EUE127.00*152.404.82
7-5/8″LTC215.90*234.9515.634-1/2″NUE132.08*155.584.89
7-5/8″BTC215.90*263.5215.824-1/2″EUE141.30*158.756.05
8-5/8″STC244.48*196.8516.23
8-5/8″LTC244.48*254.0021.67
8-5/8″BTC244.48*269.8820.86
9-5/8″STC269.88*196.8518.03
9-5/8″LTC269.88*266.7025.45
9-5/8″BTC269.88*269.8823.16
10-3/4″STC298.45*203.2020.78
10-3/4″BTC298.45*269.8825.74
11-3/4′STC323.85*203.2022.64
11-3/4′BTC323.85*269.8828.03
13-3/8″STC365.12*203.2025.66
13-3/8″BTC365.12*269.8831.77
16″STC431.80*228.634.91
16″BTC431.80*269.8840.28
18-5/8″STC508.00*228.6051.01
18-5/8″BTC508.00*269.8862.68
20″STC533.40*228.643.42
20″LTC533.4*292.1057.04
20″BTC533.40*269.8850.1

 

Inspection and Tests Performed:

API SPEC 5L – Chemical composition, Mechanical properties, Hydrostatic test, Dimensional testing, Visual inspection, Nondestructive inspection

API SPEC 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

Surface Treatment:

5L – Uncoated(bare), Temporary coating, Special coating, Oil-dip, Shot Blasting, Varnish
Size: We supply various line pipes including seamless line pipes
(OD from 2-3/8″ to 24″, steel grade A, B, X42 – X80)

 

Tubing and casing are key portions of OCTG. Tubing is a distinct pipe, installed in production casing after well cementing to allow the oil and gases flow to the ground. Casings are those pipes supporting the wall of oil and gas well. It is mainly divided in 3 major categories- the surface, protection and production casing.

 

 

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