Casing & Tubing

Huaxi Special Steel Manufacturing Co., Ltd
Casing & Tubing

Products

Casing & Tubing

Casing & Tubing is a steel pipe column installed in the drilling wellbore, which is combined with the well wall through cementing to form a stable wellbore structure. It belongs to the "trunk pipeline" of the oil and gas well, extending from the wellhead to the target formation, and is used to maintain the integrity of the wellbore, isolate different formations (such as water layers, high-pressure layers, etc.), and provide a channel for subsequent production.
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Size Range

Outer diameter: 1.315"- 20"
Wall thickness: 0.133"-0.500"
Length: R1(group1), R2(group2), R3(group3)


Standard & Grade

API 5CT J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110

Types of Thread

API standard thread
STC (short round thread)
LTC (long round thread)
BTC (trapezoidal thread)

Special thread (Premium Connection)
Metal-to-metal seal (such as VAM, FOX, Hydril).
High pressure and bending resistance, suitable for high temperature and high pressure (HPHT) wells.

Representative brands:
VAM® (Vallourec)
TMK (Russian Steel Pipe Company)
Hydril Wedge (National Oilwell)

Classification

Conductor Casing

Conductor casing is the first boundary between the surface and the subsurface. It helps prevent well collapse, keeps away the groundwater, and most importantly provides structural support. Conductor casing is installed in the ground by either drilling it or hammering it down. It is available in sizes ranging from 18″ to 36″.

Surface Casing
The purpose of surface casing is primarily environmental and to ensure safety. It helps in separating the freshwater zones, offers protection from blowout, and supports the wellhead and blow out prevention (BOP) equipment. Therefore surface casing is required to maintain very high safety standards. It is responsible for supporting the next casing in line. It may vary in size depending on the purpose, but the most common size of surface casing is 13 3/8”.

Intermediate Casing
Intermediate casing is not always required in all types of oil and gas production. If used, it is placed between the surface and the production casing. It is available in sizes ranging from 13 3/8” to 16”.

Production Casing
Production casing helps provide structural integrity and pressure control of the hydrocarbon-bearing sections, mainly during the production of oil.

Production Liner

Production liners can be suspended from the production casing or one of the previous casings. They help in reducing the cost significantly as the liner is not required to run through the full depth of the well. Liners can be pre-perforated to help save time and cost.


Tubing
Tubing is inserted inside the wellbore through the oil well casing pipe, which helps the transportation of the hydrocarbons to the surface. It is pipe either used for transporting natural gas or crude oil to the facilities for further processing after the drilling is complete. Similar to the drill pipe and casing, tubing is subjected to high pressure during the extraction process, and needs to be thick, strong, and sturdy. Production tubing is available in various sizes ranging from ¾” to 4 ½”.

Dimensions and weight

Casing Pipe dimensions and weight

Labels

Outside diameter

Wall thickness

Calculated weight of plain-end pipe



Thread type

1

2

inches

mm

inches

mm

Ib/ft

kg/m




4 1/2

9.5





4.5





114.3

0.205

5.21

9.41

14.02

P, STC

10.5

0.224

5.69

10.24

15.24

P, STC, BTC

11.6

0.25

6.35

11.6

17.26

P, STC, LTC, BTC

13.5

0.29

7.37

13.5

20.09

P, LTC, BTC

15.1

0.337

8.56

15

22.32

P, LTC, BTC


5

15


5


127

0.296

7.52

14.88

22.16

P, STC, LTC, BTC

18

0.362

9.19

17.95

26.7

P, LTC, BTC


5 1/2

17



5.5



139.7

0.304

7.72

16.89

25.13

P, STC, LTC, BTC

20

0.361

9.17

19.83

29.52

P, LTC, BTC

23

0.415

10.54

22.56

33.57

P, LTC, BTC




6 5/8

20




6.625




168.28

0.288

7.32

19.51

29.06

P, STC, LTC, BTC

24

0.352

8.94

23.6

35.13

P, STC, LTC, BTC

28

0.417

10.59

27.67

41.18

P, LTC, BTC

32

0.475

12.06

31.23

46.46

P, LTC, BTC






7

23






7






177.8

0.317

8.05

22.65

33.7

P, STC, LTC, BTC

26

0.362

9.19

25.69

38.21

P, STC, LTC, BTC

29

0.408

10.36

28.75

42.78

P, LTC, BTC

32

0.453

11.51

31.7

47.2

P, LTC, BTC

35

0.498

12.65

34.61

51.52

P, LTC, BTC

38

0.54

13.72

37.29

55.52

P, LTC, BTC




7 5/8

24




7.625




193.68

0.3

8.33

25.59

38.08

P, STC, LTC, BTC

26.2

0.328

9.52

29.06

43.24

P, LTC, BTC

29.7

0.375

10.92

33.07

49.22

P, LTC, BTC

33.7

0.43

12.7

38.08

56.68

P, LTC, BTC






8 5/8

28






8.625






219.08

0.304

7.72

27.4

40.24

P, STC

32

0.325

8.94

31.13

46.33

P, STC, LTC, BTC

36

0.4

10.16

35.17

52.35

P, STC, LTC, BTC

40

0.45

11.43

39.33

58.53

P, LTC, BTC

44

0.5

12.7

43.43

64.64

P, LTC, BTC

49

0.557

14.15

48.04

71.51

P, LTC, BTC




9 5/8

36





9.625





244.48


0.352

8.94

34.89

51.93

P, STC, LTC, BTC

40

0.395

10.03

38.97

57.99

P, STC, LTC, BTC

43.5

0.435

11.05

42.73

63.61

P, LTC, BTC

47

0.472

11.99

46.18

68.75

P, LTC, BTC

53.5

0.545

13.84

52.9

78.72

P, LTC, BTC






10 3/4

40.5







10.75







273.05

0.35

8.89

38.91

57.91

P, STC, BTC

45.5

0.4

10.16

44.26

65.87

P, STC, BTC

51

0.45

11.43

49.55

73.75

P, STC, BTC

55.5

0.495

12.57

54.26

80.75

P, STC, BTC

60.7

0.545

13.84

59.45

88.47

P, STC, BTC

65.7

0.595

15.11

64.59

96.12

P, STC, BTC




11 3/4

47




11.75




298.45

0.375

9.53

45.6

69.94

P, STC, BTC

54

0.435

11.05

52.62

78.32

P, STC, BTC

60

0.489

12.42

58.87

87.61

P, STC, BTC

65

0.534

13.56

64.03

95.27

P, STC, BTC





13 3/8

48






13.375






339.73

0.33

8.38

46.02

68.48

P, STC, BTC

54.5

0.38

9.65

52.79

78.55

P, STC, BTC

61

0.43

10.92

59.5

88.55

P, STC, BTC

68

0.48

12.19

66.17

98.46

P, STC, BTC

72

0.514

13.06

70.67

105.21

P, STC, BTC

P - plain end
STC - short, round, threaded and coupled LTC - long, round, threaded and coupled BTC - buttres threaded and coupled


Tubing dimensions and weight


Label 1


Label 2*

Outside diameter

Wall thickness

Calculated pipe weight


Steel grade


Ends type

inch

mm

inch

mm

Ib/ft


1.9

2.4

1.9

48.26

0.145

3.68

2.72

4.05

H-40, J-55, N-80

P, NUE


2 3/8

4


2.375


60.32

0.167

4.24

3.94

5.84

H-40, J-55, N-80, L-80

P, NUE, EUE

4.6

0.19

4.83

4.44

6.61

H-40, J-55, N-80, L-80, P-110

P, NUE, EUE


2 7/8

6.4



2.875



73.02

0.217

5.51

6.17

9.17

H-40, J-55, N-80, L-80, P-110

P, NUE, EUE

7.8

0.276

7.01

7.67

11.41

N-80, L-80, P-110

P, NUE, EUE

8.6

0.308

7.82

8.45

12.58

N-80, L-80, P-110

P, NUE, EUE







3 1/2

7.7







3.5







88.9

0.216

5.49

7.58

11.29

H-40, J-55, N-80, L-80

P, NUE

9.2

0.254

6.45

8.81

13.12

H-40, J-55, N-80, L-80, P-110

P, NUE, EUE

10.2

0.289

7.34

9.92

14.76

H-40, J-55, N-80, L-80

P, NUE

12.7

0.375

9.52

12.7

18.9

N-80, L-80, P-110

P, NUE, EUE

14.3

0.43

10.92

14.3

21.28

L-80

P, NUE

15.5

0.476

12.09

15.5

23.07

L-80

P, NUE

17

0.53

13.46

17

25.3

L-80

P, NUE




4

9.5





4





101.6






0.226

5.74

9.12

13.57

H-40, J-55, N-80, L-80

P, NUE

10.7

0.262

6.65

10.47

15.57

H-40, J-55, N-80, L-80

P, NUE

13.2

0.33

8.38

13.2

19.64

L-80

P, NUE

16.1

0.412

10.54

16.1

23.96

L-80

P, NUE

18.9

0.5

12.7

18.9

28.13

L-80

P, NUE




4 1/2

12.6




4.5




114.3

0.271

6.88

12.6

18.75

H-40, J-55, N-80, L-80

P, NUE

15.2

0.337

8.56

15.2

22.62

L-80

P, NUE

18.9

0.43

10.92

18.9

28.3

L-80

P, NUE

21.5

0.5

12.7

21.5

32

L-80

P, NUE

* Lable 2 is for pipes with non upset ends P - plain ends (upset and non-upset)

NUE - non-upset threaded ends EUE - upset threaded ends


Tolerances

Casing


Outside diameter permissible deviations:

+1%

-0.50%


Wall thickness permissible deviations:

-12.50%

Positive deviations are limited by pipe weight

Weight deviation

+6.5%/-3.5%

Tubing

Outside diameter permissible deviations

± 0.031 inch (± 0.79 mm)


Wall thickness permissible deviations

- 12.5%.

Positive deviations are limited by pipe weight

Weight deviation

+6.5% / -3.5%



Mechanical properties

Casing


 

Grade

Tensile strength, psi/MPa

yield strength, psi/MPa

 

not less than

not less than

not more than

J-55

75000 (517)

55000 (379)

80000 (552)

K-55

95000 (655)

55000 (379)

80000 (552)

N-80

100000 (689)

80000 (552)

110000 (758)

L-80

95000 (655)

80000 (552)

95000 (655)

P-110

125000 (862)

110000 (758)

140000 (958)

Tubing


Grade

Tensile strength, psi/MPa

yield strength, psi/MPa

 

not less than

not less than

not more than

H-40

60000 (414)

40000 (276)

80000 (552)

J-55

75000 (517)

55000 (379)

80000 (552)

N-80

100000 (689)

80000 (552)

110000 (758)

P-110

125000 (862)

110000 (758)

140000 (965)

Huaxi Special Steel Manufacturing Co., Ltd

Huaxi Special Steel Manufacturing Co., Ltd

Address:1177 Huanhu Road, Yuelu District, Changsha, Hunan, China

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