Steel grade
Manufacturing process
Steel tubes can be manufactured in a seamless or welded process to meet the size, weight and performance requirements of API 5CT.
Chemical composition
The chemical composition of each steel grade is specified to ensure that the material has the required mechanical properties and corrosion resistance.
Mechanical property
Including yield strength, tensile strength, elongation, etc., different steel grades have different requirements.
Size and weight
The outer diameter, wall thickness, weight and other dimensional parameters of casing and tubing are specified in detail.
Outer diameter (OD) : According to API 5CT specifications, oil casing outer diameters can range from 2.375 inches to 20 inches, with common OD diameters being 4.5 inches, 5 inches, 5.5 inches, 7 inches, etc. Wall Thickness: The wall thickness of oil casing varies according to the outer diameter and material, usually between 0.224 inches and 1.000 inches. Length: API 5CT specifications specify a range of casing lengths, typically R1 (18-22 ft), R2 (27-30 ft), and R3 (38-45 ft).
Thread and collar
Specifies thread types (such as API round thread, partial trapezoid thread) and collar requirements to ensure connection strength and tightness. The API 5CT specification also specifies the connection mode of the casing, including both external thread (EUE) and internal thread (NU). These connections can meet the different requirements of casing in well construction and oil and gas production.
Inspection and testing
Including non-destructive testing, hydraulic test, tensile test, hardness test, etc., to ensure the quality of steel pipe.
Tags and files
The steel pipe shall be marked according to the standard, and the manufacturer shall provide the certificate of conformity and other documents.
Supplementary requirement
Optional supplementary requirements such as impact testing, hardness testing, etc. are available to meet specific needs.
Quality control
Manufacturers need to establish a quality control system to ensure that products meet standards.
Apply
Casing and tubing for oil Wells to ensure reliability in high-pressure, high-temperature and corrosive environments.
The above are common knowledge points of oil casing in API 5CT specification, according to the specific use needs and geographical conditions, you can choose the appropriate casing size and steel grade. These dimensions ensure that casing quality and performance meet international standards and are suitable for different types of well construction and production.
Post time: Mar-04-2025
