Exploring the Basics of octg: What is Oil country tubular goods (OCTG)?
Oil Country tubular goods (OCTG) are the backbone of the Oil and gas industry. They are the Pipes, tubes, and other components used to transport oil and gas from the Wellhead to the refinery. OCTG is essential for the safe and efficient production of oil and gas, and it is a critical part of the global energy infrastructure.
OCTG is made from a variety of materials, including steel, aluminum, and plastic. The most common type of OCTG is steel pipe, which is used for drilling, production, and transportation of oil and gas. Steel pipe is strong, durable, and corrosion-resistant, making it ideal for use in harsh environments.
| API 5ct L80 casing Tubing grade color Codes | ||||
| Grade | Grade Type | Number and Color of Bands for Product a with Length ³ 1.8 m | Color(s) for couplings | |
| Entire Coupling | Band(s) b, c | |||
| 1 | 2 | 3 | 4 | 5 |
| H40 | — | None or black band at the Manufacturer’s option | None | Same as for pipe |
| J55 tubing | — | One bright green | Bright green | None |
| J55 Casing | — | One bright green | Bright green | One white |
| K55 | — | Two bright green | Bright green | None |
| N80 | 1 | One red | Red | None |
| N80 | Q | One red, one bright green | Red | Green |
| R95 | — | One brown | Brown | None |
| L80 | 1 | One red, one brown | Red | One brown |
| L80 | 9Cr | One red, one brown, two yellow | None | Two yellow |
| L80 | 13Cr | One red, one brown, one yellow | None | One yellow |
| C90 | 1 | One purple | Purple | None |
| T95 | 1 | One silver | Silver | None |
| C110 | — | One white, two brown | White | Two brown |
| P110 | — | One white | White | None |
| Q125 | 1 | One orange | Orange | None |
| a In the case of coupling material, unless otherwise specified in the purchase agreement, the manufacturer’s internal requirements shall govern. | ||||
| b special clearance couplings shall also have a black band. | ||||
| c Seal-ring couplings shall also have a blue band. | ||||
OCTG is used in a variety of applications, from drilling and production to transportation and storage. It is used to build pipelines, tanks, and other infrastructure. OCTG is also used in the construction of offshore platforms, rigs, and other structures.
OCTG is an essential part of the oil and gas industry, and it is a fascinating field of engineering. It requires a deep understanding of materials, metallurgy, and engineering principles. OCTG engineers must be creative problem-solvers, able to design and build components that can withstand the extreme conditions of the oil and gas industry.
| Chemical composition, Mass Fraction (%) | ||||||||||||||
| Grade | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | |||||
| Type | min | max | min | max | min | max | min | max | max | max | max | max | max | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| H40 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| J55 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| K55 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| N80 | 1 | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| N80 | Q | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| R95 | — | — | 0.45 c | — | 1.9 | — | — | — | — | — | — | 0.03 | 0.03 | 0.45 |
| L80 | 1 | — | 0.43 a | — | 1.9 | — | — | — | — | 0.25 | 0.35 | 0.03 | 0.03 | 0.45 |
| L80 | 9Cr | — | 0.15 | 0.3 | 0.6 | 0.9 | 1.1 | 8 | 10 | 0.5 | 0.25 | 0.02 | 0.03 | 1 |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1 | — | — | 12 | 14 | 0.5 | 0.25 | 0.02 | 0.03 | 1 |
| C90 | 1 | — | 0.35 | — | 1.2 | 0.25 b | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| T95 | 1 | — | 0.35 | — | 1.2 | 0.25 b | 0.85 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| C110 | — | — | 0.35 | — | 1.2 | 0.25 | 1 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| P110 | e | — | — | — | — | — | — | — | — | — | — | 0.030 e | 0.030 e | — |
| Q125 | 1 | — | 0.35 | 1.35 | — | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| NOTE Elements shown shall be reported in product analysis. | ||||||||||||||
| a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched or polymer-quenched. | ||||||||||||||
| b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the Wall thickness is less than 17.78 mm. | ||||||||||||||
| c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched. | ||||||||||||||
| d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm. | ||||||||||||||
| e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum. | ||||||||||||||
OCTG is an exciting and rewarding field of engineering. It is a great way to make a difference in the world and to help ensure the safe and efficient production of oil and gas. If you are looking for a career that is both challenging and rewarding, consider a career in OCTG.
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