A Multifactor Coupling Prediction Model for Crack Growth of HP-13Cr Stainless Steel Under Extreme Oilfield Environments

A multifactor coupled model for stress corrosion crack growth rate in HP-13Cr stainless steel was developed using a direct current pressure drop method. Measurements were conducted to investigate the critical stress intensity factor in various well depth environments. The single-factor model for stress corrosion crack extension rate, considering temperature, CO2 pressure, and stress intensity factor, was established. Utilizing the factorial analysis, the impact of multifactor added to the model. Finally, combined with the crack initiation time model, the stress corrosion life of HP-13Cr stainless steel was predicted. A deviation of only 9.1% was discovered with the fracture time of oilfield pipelines.