Tubing
  Casing
  Premium Connection
 
Casing is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or wellbore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place. The following diagram illustrates different types of casing used in the extraction process:
Surface casing
-Protects the well from contamination in shallow water and gas layers.
-Supports the wellhead equipment and sustains the weight of the other layers of casing.
Intermediate casing
-Isolates different layers of pressure to facilitate normal circulation of drilling fluid and protect the production casing.
-Intermediate casing facilitates the installation of blow-out preventers, anti-leakage devices and tailpipes in the well.
Production casing (oil string)
-It is the conduit through which oil and gas pass from a below surface reservoir.
-It protects the well and separates fluids into various layers.
For the manufacture of tubing, green pipes undergo an "upsetting" process to thicken the walls of the pipes. Apart from this step, the manufacturing of tubing and casing are identical. First, green pipes are threaded on each end. The threading is then inspected and, if necessary, rethreaded to ensure that the thread accurately connects to the coupling. The tubing and casing are strengthened by surface treatment and are subject to various inspections, including drifting and hydrostatic tests before they are coated and packaged into tubing and casing.
Casing pipes are ordinarily produced with outside diameter sizes of 114.3 mm to 508.0 mm.
Parameters of casing pipes.

Size

Linear Mass
lb/ft


Outside diameter


Wall thichness

Type of end-finish

Grade

ln.

mm

ln.

mm

H-40

J-55
K-55

M-65

L-80
C-95

N-80 1¡¢Q

C-90
T-95

P-110

Q-125

4 1/2¡±

9.5

4.500

114.30

0.205

5.21

PS

PS

PS

--

--

--

--

--

10.50

4.500

114.30

0.224

5.69

¡ª

PSB

PSB

--

--

--

--

--

11.60

4.500

114.30

0.250

6.35

--

PSLB

PLB

PLB

PLB

PLB

PLB

--

13.50

4.500

114.30

0.290

7.37

--

--

PLB

PLB

PLB

PLB

PLB

--

15.10

4.500

114.30

0.337

8.56

--

--

--

--

--

--

PLB

PLB

5¡±

11.50

5.000

127.00

0.220

5.59

--

PS

PS

--

--

--

--

--

13.00

5.000

127.00

0.253

6.43

--

PSLB

PSLB

--

--

--

--

--

15.00

5.000

127.00

0.296

7.52

--

PSLB

PLB

PLB

PLB

PLB

PLB

--

18.00

5.000

127.00

0.362

9.19

--

--

PLB

PLB

PLB

PLB

PLB

PLB

21.40

5.000

127.00

0.437

11.10

--

--

PLB

PLB

PLB

PLB

PLB

PLB

23.20

5.000

127.00

0.478

12.14

--

--

--

PLB

PLB

PLB

PLB

PLB

24.10

5.000

127.00

0.500

12.70

--

--

--

PLB

PLB

PLB

PLB

PLB

5 1/2¡±

14.00

5.500

139.70

0.244

6.20

PS

PS

PS

--

--

--

--

--

15.50

5.500

139.70

0.275

6.98

--

PSLB

PSLB

--

--

--

--

--

17.00

5.500

139.70

0.304

7.72

--

PSLB

PLB

PLB

PLB

PLB

PLB

--

20.00

5.500

139.70

0.361

9.17

--

--

PLB

PLB

PLB

PLB

PLB

--

23.00

5.500

139.70

0.415

10.54

--

--

PLB

PLB

PLB

PLB

PLB

PLB

26.80

5.500

139.70

0.500

12.70

--

--

--

--

--

P

--

--

29.70

5.500

139.70

0.562

14.27

--

--

--

--

--

P

--

--

32.60

5.500

139.70

0.625

15.87

--

--

--

--

--

P

--

--

35.30

5.500

139.70

0.687

17.45

--

--

--

--

--

P

--

--

38.00

5.500

139.70

0.750

19.05

--

--

--

--

--

P

--

--

40.50

5.500

139.70

0.812

20.62

--

--

--

--

--

P

--

--

43.10

5.500

139.70

0.875

22.23

--

--

--

--

--

P

--

--

6 5/8¡±

20.00

6.625

168.28

0.288

7.32

PS

PSLB

PSLB

--

--

--

--

--

?

24.00

6.625

168.28

0.352

8.94

--

PSLB

PLB

PLB

PLB

PLB

PLB

--

28.00

6.625

168.28

0.417

10.59

--

--

PLB

PLB

PLB

PLB

PLB

--

32.00

6.625

168.28

0.475

12.06

--

--

--

PLB

PLB

PLB

PLB

PLB

7¡±

17.00

7.000

177.80

0.231

5.87

PS

--

--

--

--

--

--

--

20.00

7.000

177.80

0.272

6.91

PS

PS

PS

--

--

--

--

--

23.00

7.000

177.80

0.317

8.05

--

PSLB

PLB

PLB

PLB

PLB

--

--

26.00

7.000

177.80

0.362

9.19

--

PSLB

PLB

PLB

PLB

PLB

PLB

--

29.00

7.000

177.80

0.408

10.36

--

--

PLB

PLB

PLB

PLB

PLB

--

32.00

7.000

177.80

0.453

11.51

--

--

PLB

PLB

PLB

PLB

PLB

--

35.00

7.000

177.80

0.498

12.65

--

--

--

PLB

PLB

PLB

PLB

PLB

38.00

7.000

177.80

0.540

13.72

--

--

--

PLB

PLB

PLB

PLB

PLB

42.70

7.000

177.80

0.625

15.87

--

--

--

--

--

P

--

--

46.40

7.000

177.80

0.687

17.45

--

--

--

--

--

P

--

--

50.10

7.000

177.80

0.750

19.05

--

--

--

--

--

P

--

--

53.60

7.000

177.80

0.812

20.62

--

--

--

--

--

P

--

--

57.10

7.000

177.80

0.875

22.23

--

--

--

--

--

P

--

--

7 5/8¡¯¡¯

24.00

7.625

193.68

0.300

7.62

PS

-

-

-

-

-

-

-

26.40

7.625

193.68

0.328

8.33

-

PSLB

PSLB

PLB

PLB

PLB

PLB

-

29.70

7.625

193.68

0.375

9.53

-

-

PLB

PLB

PLB

PLB

PLB

-

33.70

7.625

193.68

0.430

10.92

-

-

PLB

PLB

PLB

PLB

PLB

-

39.00

7.625

193.68

0.500

12.70

-

-

-

PLB

PLB

PLB

PLB

PLB

42.80

7.625

193.68

0.562

14.27

-

-

-

PLB

PLB

PLB

PLB

PLB

45.30

7.625

193.68

0.595

15.11

-

-

-

PLB

PLB

PLB

PLB

PLB

47.10

7.625

193.68

0.625

15.88

-

-

-

PLB

PLB

PLB

PLB

PLB

51.20

7.625

193.68

0.687

17.45

-

-

-

-

-

P

-

-

55.30

7.750

193.68

0.750

19.05

-

--

-

?

-

P

-

-

7 3/4¡±

46.10

8.625

219.08

0.595

15.11

-

-

-

P

P

P

P

P

8 5/8¡±

24.00

8.625

219.08

0.264

6.71

-

PS

PS

-

-

-

-

-

28.00

8.625

219.08

0.304

7.72

PS

-

PS

-

-

-

-

-

32.00

8.625

219.08

0.352

8.94

PS

PSLB

PSLB

-

-

-

-

-

36.00

8.625

219.08

0.400

10.16

-

PSLB

PSLB

PLB

PLB

PLB

PSLB

-

?

8.625

219.08

0.450

11.43

-

-

PLB

PLB

PLB

PLB

PLB

-

44.00

8.625

219.08

0.500

12.70

-

-

-

PLB

PLB

PLB

PLB

-

49.00

9.625

244.28

0.557

14.15

-

-

-

PLB

PLB

PLB

-

PLB

9 5/8¡±

32.30

9.625

244.48

0.312

7.92

PS

-

-

-

-

-

-

-

?

36.00

9.625

244.48

0.352

8.94

PS

PSLB

PSLB

-

-

-

-

-

40.00

9.625

244.48

0.395

10.03

-

PSLB

PSLB

PLB

PLB

PLB

PLB

-

43.50

9.625

244.48

0.435

11.05

-

-

PLB

PLB

PLB

PLB

PLB

-

47.00

9.625

244.48

0.472

11.99

-

-

PLB

PLB

PLB

PLB

PLB

PLB

53.50

9.625

244.48

0.545

13.84

-

-

-

PLB

PLB

PLB

PLB

PLB

58.40

9.625

244.48

0.595

15.11

-

-

-

PLB

PLB

PLB

-

PLB

59.40

??9.625

244.48

0.609

15.57

-

-

-

-

-

P

-

-

64.90

9.625

244.48

0.672

17.07

-

-

-

-

-

P

-

-

70.30

9.625

244.48

0.734

18.64

-

-

-

-

-

P

-

-

75.60

9.625

244.48

0.797

20.24

-

-

-

-

-

P

-

-

10 3/4¡±

32.75

10.75

273.05

0.279

7.09

PS

-

-

-

-

-

-

-

40.50

10.75

273.05

0.350

8.89

PS

PSB

PSB

-

-

-

-

-

45.50

1075

273.05

0.400

10.16

-

PSB

PSB

-

-

-

-

-

51.00

10.75

273.05

0.450

11.43

-

PSB

PSB

PSB

PSB

PSB

PSB

-

55.50

10.75

273.05

0.468

12.57

-

-

PSB

PSB

PSB

PSB

PSB

-

60.70

10.75

273.05

0.545

13.84

-

-

-

-

-

PSB

PSB

PSB

65.70

10.75

273.05

0.595

15.11

-

-

-

-

-

PSB

PSB

PSB

73.20

10.75

273.05

0.672

17.07

-

-

-

-

-

P

-

-

79.20

10.75

27305

0.734

18.64

-

-

-

-

-

P

-

-

85.30

10.75

273.05

0.797

20.24

-

-

-

-

-

P

-

-

11 3/4¡±

42.00

11.75

298.45

0.333

8.46

PS

-

-

-

-

-

-

-

47.00

11.75

298.45

0.375

9.53

-

PSB

PSB

-

-

-

-

-

54.00

11.75

298.45

0.435

11.05

-

PSB

PSB

-

-

-

-

-

65.00

11.75

298.45

0.534

13.56

-

-

-

P

P

P

P

P

71.00

11.75

298.45

0.582

14.78

-

-

-

P

P

P

P

P

13 3/8¡±

48.00

13.375

339.73

0.330

8.38

PS

-

-

-

-

-

-

-

54.50

13.375

339.73

0.380

9.65

-

PSB

PSB

-

-

-

-

-

61.00

13.375

339.73

0.430

10.92

-

PSB

PSB

-

-

-

-

-

68.00

13.375

339.73

0.480

12.19

-

PSB

PSB

PSB

PSB

PSB

PSB

-

72.00

13.375

339.73

0.514

13.06

-

-

-

PSB

PSB

PSB

PSB

PSB

16¡±

65.00

16.000

406.40

0.375

9.53

PS

-

-

-

-

-

-

-

75.00

16.000

406.40

0.438

11.13

-

PSB

PSB

-

-

-

-

-

84.00

16.000

406.40

0.495

12.75

-

PSB

PSB

-

-

-

-

-

109.00

16.000

406.40

0.656

16.66

-

P

-

P

P

-

P

P

18 5/8¡±

87.50

18.625

473.08

0.435

11.05

PS

PSB

PSB

-

-

-

-

-



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