Oil casing
Oil casing is a steel pipe used to support the walls of oil and gas wells, ensuring the smooth progress of drilling operations and the normal operation of the well after completion.
I. Types and Applications
Based on their application, they can be classified into: guide casing, surface casing, technical casing, and production casing.
By thread type, they can be classified into: short-thread casing and its couplings, and long-thread casing and its couplings.
By steel strength, they can be classified into different steel grades, such as J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different steel grades are used depending on well conditions and depth.
II. Specifications and Appearance
The outer diameter of oil casing typically ranges from 114.3 mm to 508 mm.
Lengths are not fixed, ranging from 8 to 13 meters; however, API standards also specify three length categories: R-1 (4.88–7.62 meters), R-2 (7.62–10.36 meters), and R-3 (10.36 meters and longer).
Wall thickness varies with diameter; the API standard specifies a wall thickness range of 5.21 to 16.13 millimeters for various pipes. Generally, smaller-diameter casing has a thinner wall, while larger-diameter casing has a thicker wall.
III. Properties and Testing
Oil casing must possess sufficient strength and toughness to withstand complex downhole stress conditions.
IV. Production and Applications
Oil casing is typically manufactured from geological drilling steel through hot rolling or cold drawing.
Applications
Oil casing is widely used in the oil drilling industry and serves as the lifeline for maintaining well operations.
We also provide forging blanks and CNC precision machining services for our clients, covering industries such as energy, petrochemicals, steel, engineering machinery, plastics, prevention and control, hydraulics, healthcare, and food. Please feel free to send us drawings for inquiries.
