Effect of Particulate Impact on Oilfield Inhibitor

摘要

Erosion-corrosion can produce higher wall penetration rates than erosion or corrosion alone. Experiments were performed to define the effect of particulate impact on the performance of oil field inhibitors. The study deals with erosive effects on inhibition by a commercial inhibitor containing a quaternary ammonium salt and thiosulphate on clean surfaces in carbon dioxide (CO_2) saturated brine particle free solution and with particles (slurry) at different flow conditions using rotating cylinder electrode. The work reported here considers the effects of shear stress and particle loading on inhibitor performance at pH 5. Results showed that the inhibitor did not hinder erosion, the total weight loss measured was much higher in slurry than in solution. However, the electrochemical corrosion rate was much reduced in both solution and slurry. Furthermore, corrosion rate was measured to be higher in solution than in slurry under low shear stresses at uninhibited condition. Also, the inhibitor performance was reduced at high shear stresses compared to low shear stresses. RCE can be used to generate erosive conditions.