Main control factors and prediction model of flow-accelerated CO2/H2S synergistic corrosion for X65 steel

Insight into polymer concentration, temperature, CO2 content, and Cl− content on corrosion of N80 steel tubing in polymer flooding

“…To analyze the influence degree of polymer concentration, temperature, CO 2 content, and Cl − content on tubing corrosion, the influence rate of corrosion factors is calculated through the below equation. [ 13,49,50 ] $$${\varphi }_{i}=\frac{{v}_{i,\max }}{{v}_{P,\max }+{v}_{T,\max }+{v}_{C{l}^{ \mbox{-} },\max }+{v}_{C{O}_{2},\max }}\times 100 \% ,$$$where $${\varphi }_{i}$$ is the influence rate of corrosion factors (%); $${v}_{i,\max }$$ is the peak of corrosion rate of tubing under a certain influence factor (mm/a); $${v}_{P,\max }$$ is the peak corrosion rate of tubing under different polymer concentration (mm/a); $${v}_{T,\max }$$ is the peak corrosion rate of tubing under different temperature (mm/a); $${v}_{{\text{Cl}}^{ \mbox{-} },\max }$$ is the peak corrosion rate of tubing under Cl − ions (mm/a); $${v}_{{\text{CO}}_{2},\max }$$ is the peak corrosion rate of tubing under CO 2 content (mm/a).…”

“…To analyze the influence degree of polymer concentration, temperature, CO 2 content, and Cl − content on tubing corrosion, the influence rate of corrosion factors is calculated through the below equation. [13,49,50]…”

First-Principles Study on the Adsorption Characteristics of Corrosive Species on Passive Film TiO2 in a NaCl Solution Containing H2S and CO2

“…At the same time, Cl − itself has a corresponding influence on the formation of the corrosion product layer [51]. With the influence of H 2 CO 3 , Cl − further destroys the integrity of TiS 2 on the metal matrix and accelerates the dissolution of the matrix [52], resulting in an increase in the number and depth of corrosion pits. The above discussion is consistent with the experimental results in the relevant literature: compared with the CO 2 corrosion environment in formation water, the passive film on the surface of titanium alloy is more vulnerable to damage in the water solution containing the H 2 S corrosion medium [35].…”

Corrosion Evolution mechanism of N80 tubing steel under supercritical CO2 and H2S environment

“…In recent decades, many scholars have conducted extensive research on the corrosion behavior of carbon steel in CO2 and H2S environments. In CO2-dominant environments, the presence of H2S has a significant impact on the corrosion process, and its specific effects depend on the concentration of H2S [6][7][8] . H2S not only alters the corrosion rate but also causes changes in the corrosion morphology [7,9] .…”