Exploring the Different Types of Casing Specifications and models
Casing is a critical component of any wellbore, providing structural integrity and preventing the influx of fluids. There are several types of casing specifications and models available, each with its own unique characteristics and applications.
API casing is the most common type of casing used in Oil and Gas wells. It is manufactured to meet the standards set by the American Petroleum Institute (API). API casing is available in a variety of sizes and grades, including H40, J55, K55, N80, l80, C90, T95, P110, and Q125.
Premium casing is a type of casing that is designed to provide superior performance in challenging wellbore conditions. It is typically made from high-grade Steel and is available in a variety of sizes and grades.
Expandable Casing is a type of casing that is designed to expand when it is run into the wellbore. This type of casing is often used in horizontal wells and can be used to reduce the amount of casing required.
Slimhole Casing is a type of casing that is designed to be used in slimhole wells. It is typically made from high-grade steel and is available in a variety of sizes and grades.
Casing Accessories are components that are used to secure the casing in the wellbore. These include Centralizers, float equipment, and Cementing tools.
Casing models are used to predict the behavior of the casing in the wellbore. These models are used to determine the optimal casing design and to ensure that the casing will perform as expected.
Understanding the Benefits of Using Casing Specifications and Models in Your Projects
Casing specifications and models are essential tools for any project. They provide a comprehensive overview of the project’s requirements and help ensure that the project is completed on time and within budget. Casing specifications and models provide a detailed description of the project’s scope, objectives, and timeline, as well as the Materials and processes needed to complete the project. They also provide a framework for communication between the project team and stakeholders, helping to ensure that everyone is on the same page. By using casing specifications and models, project teams can ensure that all aspects of the project are properly accounted for and that the project is completed in a timely and cost-effective manner.
| 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. | |||||||||
