Oil Tubing

Oil Tubing

Oil Tubing for Drilling The American Petroleum Institute (API) developed Specifications, Recommended Practices, and Bulletins for steel tubing that meet the major needs of the oil and gas industry.

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Oil Tubing


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The American Petroleum Institute (API) developed Specifications, Recommended Practices, and Bulletins for steel tubing that meet the major needs of the oil and gas industry. API documents are reviewed and updated every 5 years. This effort continues, and many of these documents (with modifications) have become International Organization for Standardization (ISO) documents. Currently, API and ISO are the international standards for products intended for worldwide use in the petroleum and natural gas industry. API tubing sizes range from ODs of 1.050 to 4.500 in. For high-rate wells, tubing larger than 4½ in. may be beneficial. API and ISO specifications contain provisions when casing is used as tubing.


In addition to API steel tubing, there are hostile well conditions that may be better served by other materials. There are proprietary steel grades that do not conform to all aspects of the API specifications but are used in the petroleum-producing industry for:


Resistance to weight-loss corrosion
Higher strengths
Less susceptibility to sulfide stress corrosion cracking (SSC)
Wear resistance


Corrosion-resistant alloy (CRA) is a special material that is sometimes used in hostile environments. These special materials are usually expensive but may prove worthwhile over the life of the well; however, CRA tubing does not always eliminate corrosion and may be incompatible with some completion fluids. See ISO 13680 for information on CRA seamless tubes.

Thermoplastic (fiberglass) tubing has been used successfully in corrosive wells. Most thermoplastic tubing has good tension properties and burst resistance, but has relatively small collapse-pressure resistance and poorer wear resistance properties than steel tubing. If temperatures exceed 150°F, a derating service factor may be required. Other metals and materials have been used as tubing but rarely are used in current oil and gas completions either because of their cost or because of limited applicability.


The tubing, are special pipes developed for oil (gas, water) wells and fields, is used to export and transmit the oil (gas, water) from such oil (gas, water) wells to the outside. Products comply with Specifications on Casing and Tubing (API Spec 5CT), Specifications on Processing, Measuring and Inspecting Casing, Tubing and Threads (API Spec 5B) and other related standards.

Technical Parameters

Tubing Size
    in

Weight

OD

Wall Thickness

Non upset

Ex-upset

in,

mm

in.

mm

T&C

T&C

2-3/8

4

--

2.375

60.33

0.167

4.24

4.6

4.7

0.19

4.83

5.8

5.95

0.254

6.45

6.6

--

0.295

7.49

7.35

7.45

0.336

8.53

2-7/8

6.4

6.5

2.875

73.03

0.217

5.51

7.8

7.9

0.276

7.01

8.6

8.7

0.308

7.82

9.35

9.45

0.34

8.64

10.5

---

0.392

9.96

11.5

0.44

11.18

3-1/2

7.7

---

3.5

88.9

0.216

5.49

9.2

9.3

0.254

6.45

10.2

---

0.289

7.34

12.7

12.95

0.375

9.52

14.3

---

0.43

10.92

15.5

0.476

12.09

17

0.53

13.46

4

9.5

---

4

101.6

0.226

5.74

---

11

0.262

6.65

13.2

---

0.33

8.38

16.1

0.415

10.54

18.9

0.5

12.7

22.2

0.61

15.49

4-1/2

12.6

12.75

4.5

114.3

0.271

6.88

15.2

---

0.337

8.56

17

0.38

9.65

18.9

0.43

10.92

21.5

0.5

12.7

23.7

0.56

14.22

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