GB/T 20657-2022

This standard provides the formulae and calculation methods for determining the mechanical and physical properties of casing, tubing, drill pipe, and line pipe used as casing or tubing in the petroleum and natural gas industries. It is applied by engineers and procurement professionals for designing well strings, selecting appropriate pipe grades, and verifying performance under downhole conditions. The standard ensures consistent and accurate calculations for burst, collapse, and tensile strength across exploration, drilling, and production operations.