Stress Corrosion Cracking Sensitivity of Super 13Cr Tubing in Different Completion Fluid Environments

Slow strain rate test (SSRT) combined with energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM) observations were used to study the stress corrosion cracking (SCC) susceptibility of super 13Cr stainless steel tubing in three different phosphate well completion fluids commonly used in the field. The results show that the SCC sensitivity of the super 13Cr stainless steel tubing existed in all three phosphate completion fluid environments at 120℃. And the degrees of corrosion in the three phosphate completion fluids from weak to strong were as follows:No. 1 phosphate completion fluid < No. 2 phosphate completion fluid < No. 3 phosphate completion fluid. The increase in the SCC sensitivity of the material was due to the damage of corrosion and the decline of fracture toughness.