Oil Country Tubular Goods （OCTG）

Part 2 Oil Country Tubular Goods （OCTG）

1. General Introduction

Based on the introduced advanced equipments and technologies from Japan, Germany, Italy and US, China has developed its own technologies and equipments for the manufacture of casing, tubing, drill pipe, heavy weight drill pipe, drill collar and kelly covering steel making, pipe making, heat treatment, upset processing, threading and NDT (Nondestructive Testing).

CPTDC can provide all kinds of oil country tubular goods and internal coating services for casing, tubing and drill pipe, and hardbanding for drill pipe and heavy weight drill pipe.

Casing, tubing, drill pipe, heavy weight drill pipe, drill collar and kelly made in China have been not only widely used in domestic oil and gas development, but also served in and highly desired by other countries such as Venezuela, Cuba, Pakistan, India, Indonesia, Burma, Russia, Kazakhstan, Turkmenistan, Uzbekistan, Azerbaijan, Sudan and Algeria.

Up to now, China has established an annual production capability of 3, 880, 000 tons (4, 268, 000 US tons) of casing and tubing, 500, 000 tons (550, 000 US tons) of drill pipe and 50, 000 pieces of kelly, heavy weight drill pipe, drill collar, and non-magnetic drill collar.

2. Casing, Tubing and Associated Products

Casing and Tubing

In recent years, the Chinese manufactures have cooperated with universities and research centers in the research on casing and tubing and have gained many good results. The product quality has been greatly improved. Many types of special casings and tubings including anticorrosion casing and tubing, high collopse casing, high temperature casing, premium connection casing and tubing have been successively developed some of which have reached the level of world class.

● Application

● Casing for oil and gas well drilling

● Tubing for oil and gas extraction

● Product Type

● Seamless casing and coupling

● ERW casing

● Seamless tubing and coupling

● Anticorrosion casing and tubing

● High collapse casing

● High temperature casing

● Premium thread connection casing and tubing

● Pup-joint of casing and tubing

● Crossover of casing and tubing

● Features

● High precision in size and shape

● Good corrosion resistance

● High collapse strength

● Excellent comprehensive mechanical properties

● High connection strength and sealability

● Constant mechanical properties at high temperature

● Specifications

● API Spec 5CT Specification for Casing and Tubing

● API Spec 5B Specification for Threading, Gauging, and thread Inspection of Casing, Tubing, and Line Pipe Thread

● Other manufactures’ specifications higher than API Spec

● Production Capacity

Products	Pipe type	Steel grade	Outside diameter mm (in)	Wall thickness mm (in)	Thread type	Production capacity t/y (US ton/y)
Casing and Coupling	Seamless Pipe	J55, K55, M65, L80, N80, C90, C95, Pl10	114.3-508.0 (4-1/2-20)	5.2-16.13 (0.22-0.635)	PSLBE^②	2, 250, 000 (2, 475, 000)
	Seamless Pipe	TP65H, TP80S, TP80SS, TP80T, TP80TS, TP80CQJ, TP90S, TP90SS, TP90, TP90H, TP95S, TP95SS, TP95T, TP95TS, TP95TT, TP100, TP100H, TP110T, TP110TT, TP110CQJ, TP125TT^①	114.3-339.7 (4-1/2-13-3/8)	5.2-15.88 (0.22-0.625)	PSLB TP-CQ^③	200, 000 (220, 000)
	ERW Pipe	J55, K55	139.7-508.0 (5-1/2-20)	5.87-13.84 (0.23-0.545)	PSLB	500, 000 (550, 000)
Tubing and Coupling	Seamless Pipe	J55, L80, N80, C90, Pll0, BG-80SS^④	48.26-114.3 (1.90-4-1/2)	3.68-9.52 (0.145-0.375)	PNU^⑤ BGT BGT-1^⑥	930, 000 (1, 023, 000)

Notes:①H=high temperature casing, S=sour service casing, SS=special sour service casing, T=high collapse casing, TS=sour service & high collapse casing, TT=special high collapse casing,CQJ=high ................ fatigue strength casing, TP=a code name of non API series;

②P=plain end, S=short round thread, L=long round thread, B=buttress thread, E=extreme-line;

③TP-CQ=premium thread connection of TP series;

④BG-80SS=special sour service tubing of BG series, BG= a code name of non API series;

⑤P=plain end, N=non-upset thread and coupled, U=external upset thread and coupled;

⑥BGT, BGT-1= premium thread connection of BG series.

● Process Flowchart of Casing and Tubing

● Technical Parameters of Seamless Casing

Outside diameter

Wall thickness

Nominal

weight

Type of end-finish

Kg/m

lb/ft

J55

K55

M65

L80

C95

N80

C90

T95

P110

Non api

series

114.30

4-1/2

5.21

0.205

14.14

9.50

–

5.69

0.224

15.63

10.50

PSB

–

PSB

6.35

0.250

17.26

11.60

PSLB

PLB

7.37

0.290

20.09

13.50

–

PLB

8.56

0.337

22.47

15.10

–

PLB

127.00

5.59

0.220

17.11

11.50

–

6.43

0.253

19.35

13.00

PSL

PSLB

–

PSLB

7.52

0.296

22.32

15.00

PSLB

PLB

PSLBE

PLBE

PSLBE

PSLB

9.19

0.362

26.79

18.00

–

PLB

PSLBE

PLBE

PSLBE

PSLB

11.10

0.437

31.85

21.40

–

PLB

12.14

0.478

34.53

23.20

–

PLB

12.70

0.500

35.86

24.10

–

PLB

139.70

5-1/2

6.20

0.244

20.83

14.00

–

PLB

6.98

0.275

23.07

15.50

PSLBE

PSLB

–

PLB

7.72

0.304

25.30

17.00

PSLBE

PLB

PSLBE

PLB

PSLBE

PSLB

9.17

0.361

29.76

20.00

–

PLB

PSLBE

PLB

PSLBE

PSLB

10.54

0.415

34.23

23.00

–

PLB

PSLBE

PLB

PSLBE

PSLB

168.28

6-5/8

7.32

0.288

29.76

20.00

PSLB

–

PSLB

8.94

0.352

35.72

24.00

PSLBE

PLB

PSLBE

PSLB

10.59

0.417

41.67

28.00

–

PLB

PSLBE

PSLB

12.06

0.475

47.62

32.00

–

PSLBE

PSLB

177.80

6.91

0.272

29.76

20.00

–

8.05

0.317

34.23

23.00

PSLBE

PLB

PSLBE

PLBE

–

PSLB

9.19

0.362

38.69

26.00

PSLB

PLB

PSLBE

PLBE

PSLBE

PSLB

10.36

0.408

43.16

29.00

–

PLB

PSLBE

PLBE

PSLBE

PSLB

11.51

0.453

47.62

32.00

–

PLB

PSLBE

PLBE

PSLBE

PSLB

12.65

0.498

52.13

35.00

–

PSLBE

PLBE

PSLBE

PSLB

13.72

0.540

56.60

38.00

–

PSLBE

PLBE

PSLBE

PSLB

193.68

7-5/8

8.33

0.328

39.29

26.40

PSLB

PLB

PLBE

–

PSLB

9.52

0.375

44.20

29.70

–

PLB

PLBE

PLB

10.92

0.430

50.15

33.70

–

PLB

PLBE

PLB

193.68

7-5/8

12.70

0.500

58.05

39.00

–

PLB

PLBE

PLB

14.27

0.562

63.69

42.80

–

PLB

15.11

0.595

67.41

45.30

–

PLB

15.88

0.625

70.09

47.10

–

PLB

219.08

8-5/8

6.71

0.264

35.75

24.00

–

7.72

0.304

41.67

28.00

–

8.94

0.352

47.66

32.00

PSLB

–

PSLB

10.16

0.400

53.62

36.00

PSLB

PLB

PLBE

–

PSLB

11.43

0.450

59.58

40.00

–

PLB

PLBE

PLB

12.70

0.500

65.54

44.00

–

PLB

PLBE

PLB

14.15

0.557

72.99

49.00

–

PLB

PLBE

PLB

244.48

9-5/8

8.94

0.352

53.57

36.00

PSLB

–

PLB

10.03

0.395

59.53

40.00

PSLB

PLB

11.05

0.435

64.73

43.50

–

PLB

11.99

0.472

69.94

47.00

–

PLB

13.84

0.545

79.62

53.50

–

PLB

15.11

0.595

86.91

58.40

–

PLB

273.05

10-3/4

8.89

0.350

60.32

40.50

PSB

PLB

10.16

0.400

67.78

45.50

PSB

–

PSB

11.43

0.450

75.96

51.00

PSB

12.57

0.495

72.67

55.50

–

PSB

13.84

0.545

90.41

60.70

–

PSB

15.11

0.595

97.86

65.70

–

PSB

339.70

13-3/8

9.65

0.380

81.18

54.50

PSB

–

PSB

–

10.92

0.430

90.86

61.00

PSB

–

12.19

0.480

101.29

68.00

PSB

–

13.06

0.514

107.24

72.00

–

PSB

–

508.00

11.13

0.438

139.89

94.00

SLB

–

12.70

0.500

158.49

106.50

SLB

–

16.13

0.635

197.93

133.00

SLB

–

Notes:①We can also supply non-API casings and couplings according to customers’ requirements;

②We can supply premium thread connections according to customers’ requirement.

● Technical Parameters of ERW Casing

Outside diameter

Wall thickness

Nominal weight

Steel grade

Type of end-finish

kg/m

lb/ft

139.70

5-1/2

6.20

0.244

20.83

14.00

J55 / K55

6.98

0.275

23.07

15.50

J55 / K55

PSLB

7.72

0.304

25.30

17.00

J55 / K55

PSLB

168.28

6-5/8

8.94

0.352

35.72

24.00

J55 / K55

PSLB

177.80

6.91

0.272

29.76

20.00

J55 / K55

8.05

0.317

34.23

23.00

J55 / K55

PSLB

9.19

0.362

38.69

26.00

J55 / K55

PSLB

219.08

8-5/8

6.71

0.264

35.75

24.00

J55 / K55

7.72

0.304

41.67

28.00

J55 / K55

8.94

0.352

47.66

32.00

J55 / K55

PSLB

10.16

0.400

53.62

36.00

J55 / K55

PSLB

244.48

9-5/8

8.94

0.352

53.57

36.00

J55 / K55

PSLB

10.03

0.395

59.53

40.00

J55 / K55

PSLB

273.05

10-3/4

8.89

0.350

60.32

40.50

J55 / K55

PSB

10.16

0.400

67.78

45.50

J55 / K55

PSB

339.70

13-3/8

8.38

0.330

71.43

48.00

J55 / K55

PSB

9.65

0.380

81.18

54.50

J55 / K55

PSB

10.92

0.430

90.86

61.00

J55 / K55

PSB

12.19

0.480

101.29

68.00

J55 / K55

PSB

Note: We can also supply non-API ERW casings according to customers’ requirements.

● Technical Parameters of Tubing

Outside

diameter

Wall thickness

Weight

Type of end-finish

Non-upset

T&C

External upset T&C

kg/m

lb/ft

kg/m

lb/ft

J55

L80

N80

C90

Pll0

48.26

1.900

3.68

0.145

4.09

2.75

4.32

2.90

PNU

–

5.08

0.200

5.43

3.65

5.55

3.73

60.32

2-3/8

4.24

0.167

5.95

4.00

–

4.83

0.190

6.85

4.60

6.99

4.70

PNU

6.45

0.254

8.63

5.80

8.85

5.95

–

PNU

8.53

0.336

10.94

7.35

11.09

7.45

–

73.02

2-7/8

5.51

0.217

9.52

6.40

9.67

6.50

PNU

7.01

0.276

11.61

7.80

11.76

7.90

–

PNU

7.82

0.308

12.80

8.60

12.95

8.70

–

PNU

8.64

0.340

13.91

9.35

14.06

9.45

–

11.18

0.440

17.11

11.50

–

88.90

3-1/2

5.49

0.216

11.46

7.70

–

6.45

0.254

13.69

9.20

13.84

9.30

PNU

7.34

0.289

15.19

10.20

–

9.52

0.375

18.91

12.70

19.27

12.95

–

PNU

101.60

5.74

0.226

14.14

9.50

–

6.65

0.262

–

16.37

11.00

–

114.30

4-1/2

6.88

0.271

18.75

12.60

18.97

12.75

PNU

–

Note: We can also supply non-API tubings and couplings according to customers’ requirements.

● Part of Production Line of Casing and Tubing

Internal Coating for Casing & Tubing

Generally, the internal coating for casing and tubing is made of optimized epoxy phenolic resin. It has high impact and temperature resistance, perfect edge coverage, extremely high glossiness and flexibility, and excellent adhesion and abrasion resistance. The combination of epoxy and phenolic formulations provides the superior molecular interlinkage, and also the same bend resistance and torque resistance as metal. The internal coating for casing and tubing is suitable for extremely corrosive or high temperature environment, such as chemical treatment wells, high temperature and high pressure corrosive wells. What’s more, it can provide the capability of resistance to scale, pitch and paraffin so as to promote flow efficiency.

● Product Type

● Liquid modified epoxy phenolic resin

● Epoxy phenolic resin powder

● Features

● Smooth surface

● Excellent adhesion

● Excellent flexibility

● High acid & alkali proof

● Coating thickness: 125-250 μm

● Visual inspection: no run/pin holes/drops/bubbles

● High temperature resistance: up to 204 ℃ (400 ˚F)

● Application

● Casing and tubing of Injection water wells and wasted water wells

● Tubing and line pipe for acidizing

● Strengthened exploitation system and brine treatment system

● Process Flowchart of Internal Coating for Casing and tubing

3. Drill Pipe and Associated Products

Drill Pipe

CPTDC can provide the drill pipe manufactured in accordance with API Spec 5D, API Spec 7, and API RP 7G. The steel grades include E75, X95, G105 and S135. The chemical composition of the steel is properly designed and strictly controlled.

CPTDC can also supply special drill pipes such as sour service drill pipe, low temperature drill pipe and high torque resistance drill pipe with double-shoulder tool joints (DSTJ).

● Application

● Oil and gas well drilling

● Other downhole operations

● Product Type

● API drill pipe

● Sour service drill pipe

● Low temperature drill pipe

● API tool joints

● Double-shoulder tool joints (DSTJ)

● Premium thread tool joints

● Other non API drill pipe and tool joints

● Features

● High precision in size and shape

● Good low temperature toughness

● Excellent comprehensive mechanical properties

● High connection strength and sealability

● Large inside diameter of tool joint

● High torque resistance

● High fatigue strength and long fatigue life

● Specifications

● API Spec 5D Specification for Drill Pipe

● API Spec 7 Specification for Rotary Drill Stem Elements

● API RP 7G Recommended Practice for Drill Stem Design and Operating Limits

● Process Flowchart of Hot Rolled Seamless Pipe and Drill Pipe

● Part of Production Line of Drill Pipe

● Main Technical Parameters of Drill Pipe

Nominal

size

Weight destination

Drill pipe

Tool joint

Pipe body

Upset

type

Grade

Thread type

OD of

pin & box

ID of pin

Wall thickness

in (mm)

kg/m

lb/ft

2-3/8 (60.3)

9.90

6.65

7.11

0.280

E75

NC26

85.7

3-3/8

44.45

1-3/4

X95

NC26

85.7

3-3/8

44.45

1-3/4

G105

NC26

85.7

3-3/8

44.45

1-3/4

2-7/8 (73.0)

15.49

10.40

9.19

0.362

E75

NC31

104.8

4-1/8

53.98

2-1/8

X95

NC31

104.8

4-1/8

50.80

G105

NC31

104.8

4-1/8

50.80

S135

NC31

111.1

4-3/8

4l.28

1-5/8

3-1/2 (88.9)

14.15

9.50

6.45

0.254

E75

*NC38 3-1/2 IF**

120.7

4-3/4

68.26

2-11/16

19.81

13.30

9.35

0.368

E75

NC38

1, 207.7

4-3/4

68.26

2-11/16

X95

NC38

127.0

65.09

2-9/16

G105

NC38

127.0

61.91

2-7/16

S135

NC38

127.0

53.98

2-1/8

23.09

15.50

11.40

0.449

E75

NC38

127.0

68.26

2-9/16

X95

NC38

127.0

65.09

2-7/16

G105

NC38

127.0

61.91

2-1/8

S135

*NC40 4 FH**

139.7

5-1/2

57.15

2-1/4

4 (101.6)

20.85

14.00

8.38

0.330

E75

NC40

133.4

5-1/4

71.44

2-13/16

X95

NC40

133.4

5-1/4

68.26

2-11/16

G105

NC40

139.7

5-1/2

61.91

2-7/16

4 (101.6)

20.85

14.00

8.38

0.330

S135

NC40

139.7

5-1/2

50.80

4 (101.6)

20.85

14.00

8.38

0.330

E75

NC46

152.4

82.55

3-1/4

X95

NC46

152.4

82.55

3-1/4

G105

NC46

152.4

82.55

3-1/4

S135

NC46

152.4

76.20

4-1/2 (114.3)

20.48

13.75

6.88

0.271

E75

NC46 4IF

152.4

85.73

3-3/8

E75

*NC50 4-1/2 FH

168.28

6-5/8

95.25

3-3/4

24.73

16.60

8.56

0.337

IEU

E75

*NC46 4-1/2 XH

158.8

6-1/4

82.55

3-1/4

X95

*NC46 4-1/2 XH

158.8

6-1/4

76.20

G105

*NC46 4-1/2 XH

158.8

6-1/4

76.20

S135

*NC46 4-1/2 XH

158.8

6-1/4

69.85

2-3/4

E75

NC50

168.28

6-5/8

95.25

3-3/4

X95

NC50

168.28

6-5/8

95.25

3-3/4

G105

NC50

168.28

6-5/8

95.25

3-3/4

S135

NC50

168.28

6-5/8

95.25

3-3/4

29.79

20.00

10.92

0.430

IEU

E75

*NC46 4-1/2 XH

158.8

6-1/4

79.20

X95

*NC46 4-1/2 XH

158.8

6-1/4

69.85

2-3/4

G105

*NC46 4-1/2 XH

158.8

6-1/4

63.50

2-1/2

S135

*NC46 4-1/2 XH

158.8

6-1/4

57.15

2-1/4

E75

NC50

168.28

6-5/8

92.08

3-5/8

X95

NC50

168.28

6-5/8

88.90

3-1/2

G105

NC50

168.28

6-5/8

88.90

3-1/2

S135

NC50

168.28

6-5/8

76.20

5 (127.0)

29.05

19.50

9.19

0.362

IEU

E75

NC50

168.28

6-5/8

95.25

3-3/4

5-1/2 FH

177.8

88.90

3-1/2

X95

NC50

168.28

6-5/8

88.90

3-1/2

5-1/2 FH

177.8

95.25

3-3/4

G105

NC50

168.28

6-5/8

82.55

3-1/4

5-1/2 FH

177.8

95.25

3-3/4

S135

NC50

168.28

6-5/8

69.85

2-3/4

5-1/2 FH

184.15

7-1/4

88.90

3-1/2

5 (127.0)

38.13

25.60

12.70

0.500

IEU

E75

NC50

168.28

6-5/8

88.90

3-1/2

5-1/2 FH

177.8

88.90

3-1/2

X95

NC50

168.28

6-5/8

76.20

5-1/2 FH

177.8

88.90

3-1/2

G105

NC50

168.28

6-5/8

69.85

2-3/4

5-1/2 FH

184.15

7-1/4

88.90

3-1/2

S135

5-1/2 FH

184.15

7-1/4

82.55

3-1/4

5-1/2 (139.7)

32.62

21.90

9.17

0.361

IEU

E75

5-1/2 FH

177.8

101.60

X95

5-1/2 FH

177.8

95.25

3-3/4

G105

5-1/2 FH

184.15

7-1/4

88.90

3-1/2

S135

5-1/2 FH

184.15

7-1/2

76.20

36.79

24.70

10.54

0.415

IEU

E75

5-1/2 FH

177.8

101.60

X95

5-1/2 FH

184.15

7-1/4

88.90

3-1/2

G105

5-1/2 FH

184.15

7-1/4

88.90

3-1/2

S135

5-1/2 FH

190.50

7-1/2

76.20

6-5/8 (168.3)

37.54

25.20

8.38

0.330

IEU

E75

6-5/8 FH

203.20

127.00

X95

6-5/8 FH

203.20

127.00

G105

6-5/8 FH

209.55

8-1/4

120.65

4-3/4

S135

6-5/8 FH

215.90

8-1/2

107.95

4-1/4

41.29

27.70

9.19

0.362

IEU

E75

6-5/8 FH

203.20

127.00

X95

6-5/8 FH

209.55

8-1/4

120.65

4-3/4

G105

6-5/8 FH

209.55

8-1/4

120.65

4-3/4

S135

6-5/8 FH

215.90

8-1/2

107.95

4-1/4

*The former thread type is preferential;

**FH=full hole tool joint, IF=internal flush tool joint.

Notes: ① All of the sizes above as specified in API Spec 7;

② Any kind of combination of drill pipe and tool joint of other models and sizes is available;

③ Any kind of combination of drill pipe and left hand connection is available;

④ We can provide E75 and X95 products in large batches only;

⑤ We can also provide sour service drill pipe and low temperature drill pipe;

⑥ We can provide high torque resistance drill pipe with double-shoulder tool joint (DSTJ) and other

premium thread connections.

Internal Coating for Drill Pipe

The production line of internal coating for drill pipe which is similar to that of line pipe and tubing has been improved based on the latest technologies. The internal coating for drill pipe has many good features including anticorrosion, flexibility, abrasion resistance, low flow resistance and son on, so that it can improve the flow efficiency of drilling fluid, prolong the life of drill pipe and reduce the cost of drilling.

● Product Type

● Multi-use internal coating

● Heat resistant and flexible internal coating

● High acid & alkali proof, abrasion resistance thick film internal coating

● Features

● High abrasion resistance and low friction factor

● Good adhesion and flexility

● High application temperature and pressure

● High hardness and impact resistance

● Good corrosion resistance

● Production Capacity

Description

Outside diameter mm (in)

Mills

Production line

Capacity m/line/day

Internal coating fro drill pipe

60.3-168.3 (2-3/8-6-5/8)

2, 000

Note: We can also supply the internal coating according to customers’ requirements.

Hardbanding for Drill Pipe Joint

Hardbanding is used for the external surface of tool joint to improve the abrasion resistance of drill pipe and casing, reduce the friction between the tool joint and casing. Hardbanding can effectively protect the drill pipe and casing, prolong the life of drill pipe and casing and increase the security of drilling operation.

● Product Type

● High antiwear type

● Good friction-reduction type

● Perfect combination type

● Features

● Good balance between antiwear and friction-reduction

● The wear rate is less than 6% of that of bare tool joint, which can prolong 3 times of the tool joint service life

● Good property of friction-reduction, which can reduce the casing wear to the least, and its wear to casing is less than 11% of that of bare tool joint

● Reduce the torque of drilling string

● Good weldablity with little splash and good rewelding preformance

● Friendly to environment

● Product Application

● Drill pipe

● Heavy weight drill pipe

● Drill collar

● Centralizer, absorber and other downhole tools

● Production Capacity

Description

Width

mm (in)

Mills

Production line

Capacity

mm/line/day

Hardbanding

50.8-101.6 (2-4)

500

4. Heavy Weight Drill Pipe

General

Heavy weight drill pipe is an intermediate-weight drill string element. It can effectively reduce the stress between drill pipe and drill collar and provide part of drill pressure.

The integral heavy weight drill pipe is made from AISI 4145H alloy steel and is fully heat treated. The tool joints of welded heavy weight drill pipe are made from AISI 4145H alloy steel too. All physical properties conform to API Spec 7. Every drill pipe is fully inspected by an ultrasonic unit (at full length and over full section). The standard hardbanding is on the pipe connections and center upset. On the pipe ends, it is 4-inch wide hard metal, while

on the center upset, it is 3-inch wide hard metal. The hardbanding is completely flush on either side of the connection. The thickness of the hardbanding is not more than 3.2 mm (l/8 in) compared to that of the adjacent pipe surface. The thickness may be specified by customers.

Product type

● Standard integral heavy weight drill pipe

● Standard welded heavy weight drill pipe

● Spiraled integral heavy weight drill pipe

Main Technical Parameters of Standard Integral/Welded HW Drill Pipe

Nominal

size

Total

length

Pipe body

Toot joint

Weight

Area

cm²

in²

Center

upset

Center

upset

length

Elevator

upset

Joint thread

type & size

Pin & box

length

kg/m

lb/ft

88.9

9.45

36.3

102

610

NC38

121

635/584

34.5

3-1/2

2-1/4

0.625

5.625