Study on Fracture Failure Behavior of Super 13Cr Tubing Caused by Deposited Corrosion

Fracture failure of super 13Cr can occur in complex and harsh environments such as high temperature, pressure, corrosive gas wells, which damages the economic benefit oil development also poses a great threat to wellbore integrity. Therefore, it is urgent study corrosion mechanism tubing this performed an on-site experimental analysis on failed tubing, employing microarea electrochemical scanning Kelvin probe (SKP) method investigate causes material. In addition, thermodynamics by pits turn into cracks was examined light findings nucleation pitting corrosion. The reveal scale clear surface that CaCO3 well FeCO3 are scale’s primary constituents. According SKP scan results, has risk under galvanic cell with microcorrosion cause corrosion, shows potential difference between anode area cathode material gradually increases increase immersion time. Under autocatalytic effect occlusive applied load, propagate, eventually leading breaks failure.