Casing Coupling

2 year ago

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Product details

Product description

API Coupling

As we know steel pipe coupling is a short pipe or tube that with threads on both ends, used to connect pipelines. So It is a kind of pipe fittings that with threaded connection, the advantage is easy for pipeline maintenance or to replace the broken pipe.

API Coupling refers to the steel couplings that used in connecting casing pipe and tubing. Also known by OCTG coupling, it is usually manufactured in seamless type, material grade same with the pipe body (API 5CT K55/J55, N80, L80, P110 etc), same PSL or providing higher grades than requested. Same heat treatment also applicable, except there is an special requirements.

Tubing coupling

Introduction

Normally tubing coupling OD maximum is 4 1/2”, as the tubing pipe is applied for the drilling activities (Inside the tubing is the sucker rod to drill/pump the oil), couplings type is more various and rigorous than casing, mostly used is thicken type upset coupling (Internal upset and external upset), for short is EUE coupling, it is the most favorable in tubing connections. Tubing with EU end (EUE) coupling connection also called UPTBG. Because of the end of the tubing is thickened (upset), the connecting stress is better than buttress coupling.Buttress coupling another type used for tubing connections, it has the same thickness of the pipe body, called NU end (NUE)tubing or TBG.

Features

The oil tubing coupling can solve the problem of fatigue fracture in the existing coupling due to stress concentration. Oil tubing end is connected to the inside wall of the coupling in a tapered thread. The coupling body end and oil tubing are connected with same thread pitch flat thread. The coupling is not easy to produce fatigue fracture, and has good connection effect. It can prevent the accident of oil well pipe string break effectively.

Tubing Pipe Outside Diameter（In）

Tubing Pipe Outside Diameter（mm）

Coupling Outside Diameter(mm)

Minimum Length(mm)

Diameter Of Recess(mm)

Width of Bearing

Face Regular (mm)

Max Bearing Face Diameter (mm)

Mass(Kg)

NUE

EUE

NUE

EUE

NUE

EUE

NUE

EUE

NUE

EUE

NUE

EUE

Regular

Special

Clearance

Regular with special bevel

Special

Clearance

Regular

Special

Clearance

1.9

48.26

55.88

63.50

95.25

98.42

49.86

54.76

1.59

3.18

52.07

58.34

0.56

0.84

2 3/8

60.32

73.02

77.80

73.91

107.95

123.82

61.93

67.46

4.76

3.97

66.68

71.83

69.90

1.28

1.55

1.07

2 7/8

73.02

88.90

93.17

87.88

130.18

133.35

74.63

80.16

4.76

5.56

80.98

85.88

83.24

2.34

2.40

1.55

3 1/2

88.90

107.95

114.30

106.17

142.88

146.05

90.50

96.85

4.76

6.35

98.42

104.78

100.71

3.71

4.10

2.38

101.60

120.65

127.00

146.05

152.40

103.20

109.55

4.76

6.35

111.12

117.48

4.35

4.82

4 1/2

114.30

132.08

141.30

155.58

158.75

115.90

122.25

4.76

6.35

123.19

130.96

4.89

6.05

Casing coupling

Casing coupling is for the dimensions more than 4 1/2 inch. Differently than tubing coupling is, casing coupling normally does not need to be thickened (Non-upset), which means no upset casing coupling, so it has following types:

Round thread • LTC/LC: Long round thread casing coupling
• STC/SC: Short round thread casing coupling
Buttress thread • BTC/BC: Buttress thread casing coupling
All three types has same thickness of the casing pipe body, just have different lengths.

The oil casing coupling is a necessary piece used to connect the two casing. The coupling manufacturing method is the same as seamless pipe. The steel pipe ends with internal thread to connect with the upper and lower casing. In order to ensure the joint tightness, the precision of screw thread is strictly required.

Casing Pipe Outside Diameter（In）

Casing Pipe Outside Diameter（mm）

Coupling Outside Diameter(mm)

Minimum Length(mm)

Diameter Of Recess(mm)

Width of Bearing

Face Regular (mm)

Mass(Kg)

Round

(LTC

/STC)

BTC

Round

BTC

Round

(LTC/

STC)

BTC

Round

(LTC/

STC)

BTC

Round

BTC

Regular

Special

Clearance

STC

LTC

STC

LTC

Regular

Special

Clearance

4 1/2

114.30

133.35

123.82

158.75

177.80

225.42

116.68

117.86

7.14

6.35

5.24

5.96

6.89

3.48

127.00

147.32

136.52

165.10

196.85

231.78

129.38

130.56

7.14

6.43

7.86

8.38

4.00

5 1/2

139.70

160.02

149.22

171.45

203.20

234.95

142.08

143.26

6.35

7.14

7.34

8.92

9.30

4.47

6 5/8

168.28

187.71

177.80

184.15

222.25

244.48

170.66

171.83

6.35

9.12

11.34

11.01

5.65

177.80

200.03

187.32

184.15

228.60

254.00

180.18

181.36

7.94

10.88

13.92

13.98

6.28

7 5/8

193.68

215.90

206.38

190.50

234.95

263.52

197.64

197.23

5.56

7.94

12.16

15.63

15.82

9.29

8 5/8

219.08

244.48

231.78

196.85

254.00

269.88

223.04

222.63

6.35

9.52

15.62

21.67

20.86

10.80

9 5/8

244.48

269.88

257.18

196.85

266.70

269.88

248.44

248.03

6.35

9.52

17.85

25.45

23.16

12.02

10 3/4

273.05

298.45

285.75

203.20

269.88

277.02

276.61

6.35

9.52

20.58

25.74

13.39

11 3/4

298.45

323.85

203.20

269.88

302.42

302.01

6.35

9.52

22.43

28.03

13 3/8

339.72

365.12

203.20

269.88

343.69

343.28

5.56

9.52

25.42

31.77

406.40

431.80

228.60

269.88

411.96

410.31

5.56

9.52

34.33

40.28

18 5/8

473.08

508.00

228.60

269.88

478.63

476.99

5.56

9.52

53.33

62.68

508.00

533.40

228.60

292.10

269.88

513.56

511.91

5.56

9.52

42.81

56.98

50.10

API Tubing and Casing Pup Joint

Tubing and Casing Pup Joints are machined according to the latest version of API Spec 5CT. It’s used to connect two pipes of same diameter with the same types of thread on the two ends.

The Steel Grade includes J55,K55,N80-1, N80Q, L80-1, P110 etc.

There are two types of thread widely used in Tubing pup joint:Non-upset Thread(NUE) and External-upset Thread(EUE)

There are three types of thread widely used in Casing pup joint: Long-Round Thread(LTC), Short-Round Thread(STC),Buttress Thread(BTC)

There are two types of End thread: Pin*Pin, Pin*Box(Pin*Pin with coupling)

OD	Standard	Length	Connection	Steel Grade
2 3/8”-4 1/2”	API 5CT	Customized	NUE/EUE	J55/K55/N80/L80/P110
4 1/2”-20”	API 5CT	Customized	LTC/STC/BTC	J55/K55/N80/L80/P110

Remark: We can also produce Special Pup Joint of API 5CT/5B Thread. Thanks for share the drawing.

API Crossover

Crossover is also kind of pup joint, used to connect two pipes of different diameter with the same or different types of thread on the two ends.

The OD, Length and thread type etc. are customized.

Company Profile

Henan Dongfanglong Machine Manufacture Co., Ltd

Henan Dongfanglong Machine Manufacture Co., Ltd. was founded in 1999, mainly engaged in oil pipes and pipe fittings, oil special drilling and production tools and oil automation equipments. The company is named as national integration and standard implementation enterprise, a national science and technology-based small and medium-sized enterprise. With honors of"Henan enterprise technology center", "Henan postdoctoral innovation practice base”, the company hold 35 senior engineers, engineers and technicians, and has successively obtained ISO9001 Quality system certificates, API 5CT certificate authorized by American Petroleum Institute and BV Quality supplier evaluation certificate issued by company of France. Owing more than 30 independent intellectual property rights, forming an industrial chain integrating design, development, manufacturing, testing and experiment of numerical control automation equipment for petroleum machinery products, which can meet customers' demand for products Full cycle service.

The company has established the “Dong Fang Yunlong E-commerce Trading Platform" with oil drilling and production equipment and tools as the radiation point, improved the ability of Internet cross-border e-commerce, and completed the transformation of enterprise from internal operation to building industry alliance. It has built an intelligent workshop, expanded the support of intelligent manufacturing for enterprise operation, created a new intelligent manufacturing mode with high efficiency and flexibility, and improved the core competitiveness of the enterprise. And successfully registered production and sales companies in the Netherlands, opening a new starting point for overseas investment and development.

In the future, Dongfanglong will closely focus on national policy orientation and innovation driven development strategy, formulate sustainable development transformation strategy, keep forging ahead, take creating world famous brand and winning honor for the nation as the goal, work together with people of insight from all walks of life for win-win cooperation, and build up the dream of oil equipment manufacturing.

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