When selecting the appropriate Oil casing material, it is important to consider the specific grade and type that will best suit the needs of the project. N80, R95 and T95 are popular choices for oil casing due to their strength, Corrosion resistance and overall durability. In this blog, we will explore the various coupling materials, coupling blanks, and fitting materials commonly used in these grades and how they contribute to the overall success of an oil casing project.
For grades N80, R95 and T95, coupling materials must be selected that can withstand the harsh conditions of oil drilling and production. API 5ct R95 and T95 in particular are known for their High strength and ability to perform well in harsh environments. When selecting coupling materials for these grades, it is important to consider factors such as corrosion resistance, tensile strength and impact resistance. By selecting the correct connection materials, the overall integrity and performance of oil casing can be greatly improved.
In addition to coupling materials, coupling blanks are also an important part of N80, R95 and T95 grade oil casing. These blanks are used to create a permanent Seal between the two halves of the casing, and they must be able to withstand the high pressures and temperatures often encountered during oil extraction. It is important to select coupling blanks that are compatible with the specific grade and type of casing used and ensure that they meet the necessary API quality and performance standards. By using the correct coupling blank, the overall reliability and service life of your oil casing can be significantly improved.
Coupling Material, Coupling Blanks, and Accessory Material for Grades N80 all types, R95, and T95
| Charpy Impact Test Specimen Requirements for Couplings, Coupling Stock | |||||||
| Coupling Material, Coupling Blanks, and Accessory Material for Grades N80 all types, R95, and T95 | |||||||
| Label 1 | API Connection Type and CVN Specimen Orientation, Size, and Energy | ||||||
| special-clearance b | |||||||
| NU | EU | BC | LC | SC | |||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1.05 | a | L-5-22 | — | — | — | — | — |
| 1.315 | L-5-22 | L-7-32 | — | — | — | — | — |
| 1.66 | L-5-22 | L-5-22 | — | — | — | — | — |
| 1.9 | L-5-22 | L-7-32 | — | — | — | — | — |
| 2 3/8 | L-7-32 | L-7-32 | L-7-32 | — | — | — | — |
| 2 7/8 | L-10-40 | L-10-40 | L-10-40 | — | — | — | — |
| 3 1/2 | T-5-11 | T-5-11 | T-5-11 | — | — | — | — |
| 4 | T-7-16 | T-7-16 | — | — | — | — | — |
| 4 1/2 | T-7-16 | T-7-21 | — | L-7-32 | T-7-16 | T-7-16 | — |
| 5 | — | — | — | T-5-11 | T-10-20 | T-10-20 | — |
| 5 1/2 | — | — | — | T-5-11 | T-10-20 | T-10-20 | — |
| 6 5/8 | — | — | — | T-10-20 | T-10-20 | T-10-21 | — |
| 7 | — | — | — | T-7-16 | T-10-21 | T-10-21 | — |
| 7 5/8 | — | — | — | T-10-20 | T-10-22 | T-10-23 | — |
| 8 5/8 | — | — | — | T-10-20 | T-10-23 | T-10-24 | — |
| 9 5/8 | — | — | — | T-10-20 | T-10-23 | T-10-24 | — |
| 10 3/4 | — | — | — | T-10-20 | T-10-23 | — | T-10-24 |
| 11 3/4 | — | — | — | — | T-10-23 | — | T-10-24 |
| 13 3/8 | — | — | — | — | T-10-23 | — | T-10-24 |
| 16 | — | — | — | — | — | — | — |
| 18 5/8 | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — |
| NOTE In this table, the specimen orientation (T or L) is followed by the minimum specimen size (10, 7, or 5) which is followed by the minimum absorbed energy requirement (joules) according to the following code. The absorbed energy requirement is adjusted for the test specimen size indicated. Orientation and specimen size is calculated on coupling material/stock wall and not coupling critical thickness. | |||||||
| T is the transverse specimen orientation (see Figure D.11). L is the longitudinal specimen orientation (see Figure D.11). 10 = full-size (i.e. 10 mm * 10 mm) | |||||||
| 7 = 3/4-size (i.e. 10 mm *7.5 mm) | |||||||
| 5 = 1/2-size (i.e. 10 mm* 5 mm) | |||||||
| a Not thick enough to test. | |||||||
| b The above assumes that special clearance couplings are machined from regular coupling blanks. | |||||||
For N80, R95 and T95 grades of oil casing, fitting materials such as Thread protectors and jacking caps are also important considerations. These materials help protect the enclosure during transportation and installation and provide additional security during operation. When selecting fitting materials for these grades, it is important to ensure that they are compatible with the specific grade and type of casing used and meet the necessary quality and performance standards. By using the correct fitting materials, the overall efficiency and reliability of oil casing can be greatly improved.
