Exploring the Different Types of casing Pipe and Their Uses
Casing pipe is a type of pipe used in the Oil and gas industry to protect and support the walls of a wellbore. It is typically made of steel and is used to line the borehole, preventing the collapse of the borehole walls and providing structural integrity to the well. Casing pipe is also used to isolate different zones of the wellbore, allowing for the production of multiple types of hydrocarbons from the same well.
| Tensile and Hardness Requirements | |||||||||
| grade | Yield Strength MPa | Tensile Strength | Hardness a,c | specified Wall thickness | Allowable Hardness Variation b | ||||
| Type | Total Elongation Under Load | min MPa | max | ||||||
| min | max | HRC | HBW | mm | HRC | ||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| H40 | — | 0.5 | 276 | 552 | 414 | — | — | — | — |
| J55 | — | 0.5 | 379 | 552 | 517 | — | — | — | — |
| K55 | — | 0.5 | 379 | 552 | 655 | — | — | — | — |
| N80 | 1 | 0.5 | 552 | 758 | 689 | — | — | — | — |
| N80 | Q | 0.5 | 552 | 758 | 689 | — | — | — | — |
| R95 | — | 0.5 | 655 | 758 | 724 | — | — | — | — |
| L80 L80 | 1 | 0.5 | 552 | 655 | 655 | 23 | 241 | — | — |
| L80 | 9Cr 13Cr | 0.5 | 552 | 655 | 655 | 23 | 241 | — | — |
| 0.5 | 552 | 655 | 655 | 23 | 241 | — | — | ||
| C90 | 1 | 0.5 | 621 | 724 | 689 | 25.4 | 255 | £12.70 | 3 |
| 12.71 to 19.04 | 4 | ||||||||
| 19.05 to 25.39 | 5 | ||||||||
| ³ 25.40 | 6 | ||||||||
| T95 | 1 | 0.5 | 655 | 758 | 724 | 25.4 | 255 | £12.70 | 3 |
| 12.71 to 19.04 | 4 | ||||||||
| 19.05 to 25.39 | 5 | ||||||||
| ³ 25.40 | 6 | ||||||||
| C110 | — | 0.7 | 758 | 828 | 793 | 30 | 286 | £12.70 | 3 |
| 12.71 to 19.04 | 4 | ||||||||
| 19.05 to 25.39 | 5 | ||||||||
| ³ 25.40 | 6 | ||||||||
| P110 | — | 0.6 | 758 | 965 | 862 | — | — | — | — |
| Q125 | 1 | 0.65 | 862 | 1034 | 931 | b | — | £12.70 | 3 |
| 12.71 to 19.04 19.05 | 4 | ||||||||
| 5 | |||||||||
| a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. | |||||||||
| b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9. | |||||||||
| c For through-wall hardness tests of grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number. | |||||||||
| 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. | ||||
There are several different types of casing pipe available, each with its own unique characteristics and uses. The most common type of casing pipe is api casing, which is manufactured to meet the standards set by the American petroleum Institute (API). API casing is available in a variety of sizes and grades, and is typically used in shallow wells and in areas with low pressure.
Another type of casing pipe is Premium casing, which is designed to withstand higher pressures and temperatures than API casing. Premium casing is typically used in deeper wells and in areas with higher pressure. It is also more expensive than API casing, but is more durable and can withstand more extreme conditions.
The third type of casing pipe is Production casing, which is used to isolate the production zone of the wellbore. Production casing is typically made of steel and is designed to withstand the pressure and temperature of the production zone. It is also used to isolate the production zone from the rest of the wellbore, allowing for the production of multiple types of hydrocarbons from the same well.
Finally, there is liner casing, which is used to line the borehole and provide structural integrity to the well. Liner casing is typically made of plastic or composite materials and is designed to be lightWeight and flexible. It is typically used in shallow wells and in areas with low pressure.
Casing pipe is an essential component of any oil and gas well, and the type of casing pipe used will depend on the specific requirements of the well. Each type of casing pipe has its own unique characteristics and uses, and it is important to choose the right type of casing pipe for the job.
Understanding the Benefits of Casing Pipe for Oil and Gas drilling Projects
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