The effect of acidizing process on the stress corrosion cracking of HP-13Cr stainless steel in the ultra-depth well environment was studied by the slow strain rate test, the electrochemical measurement, the microstructure observation, and the finite element modeling. The results indicated that the acidizing process significantly increased the stress corrosion cracking susceptibility of HP-13Cr stainless steel and induced the fracture mode to the brittle characteristic in the high temperature and CO₂ pressure environment. The stress corrosion cracking susceptibility also increased with the increase of temperature and CO₂ pressure. There were dense defects including pits and cracks in the fracture section from the transverse view. After the acidizing process, under tensile stress condition, the increasing roughness will cause the stress concentration and promote the local anodic dissolution, which induces the initiation of stress corrosion cracking.

通过慢应变速率试验、电化学测量、显微组织观察和有限元建模，研究了酸化工艺对超深井环境下HP-13Cr不锈钢应力腐蚀开裂的影响。结果表明，酸化过程显着增加了HP-13Cr不锈钢的应力腐蚀开裂敏感性，并在高温和CO ₂压力环境下将断裂模式诱导为脆性特征。应力腐蚀开裂敏感性也随着温度和CO _{2 的}增加而增加压力。从横向看，断裂断面存在凹坑、裂纹等致密缺陷。酸化过程后，在拉应力条件下，粗糙度的增加会引起应力集中，促进局部阳极溶解，诱发应力腐蚀开裂。