To study the erosion⁻corrosion characteristics of TP140 casing steel and 13Cr tubing steel in oil fields, we performed gas⁻solid and liquid⁻solid jet flow experiments to control particle addition, jet angle, and flow velocity and measure erosion and corrosion components. Meanwhile, we used a standard three-electrode system to study the changes in electrochemical parameters on a metal surface in a two-phase flow containing 2 wt % NaCl. Results showed that erosion is mainly dominated by the flow velocities and impact angles of particles, and corrosion rate is mainly affected by liquid flow rate. The erosion rates of the two materials increase with flow velocity, and the critical angle of maximum erosion rate exists. Meanwhile, flow velocity growth increases the current density on the TP140 surface while reducing the corrosion potential of 13Cr, but the effect of the angle on the two parameters is relatively small. The uniform corrosion of TP140 increases the erosion rate in the range of 10⁻20%, and the pitting of 13Cr increases the erosion rate in the range of 30⁻90%, indicating that the interaction between the erosion and corrosion of stainless steel is obvious.
Keywords: Gas–solid flow; erosion–corrosion; liquid–solid flow; synergistic effect; three-electrode system.