Environmentally assisted cracking performance research on casing for sour gas wells

To investigate the environmentally assisted cracking performance of C110, a series of tests were conducted, including the basic mechanical property test, the electrochemical corrosion test, the Double Cantilever Beam test (DCB), and the four-point bending test. The results indicate that cold hardening increases the yield strength, reduces the impact toughness, and degrades sulfur-resistance which greatly increases the potential risk to the integrity of the wellbore.