Study on corrosion mechanism of heavy oil production well string in H2S/CO2/O2 environment
In order to study the corrosion law of heavy oil production well string,the main factors affecting the corrosion of pipe string were evaluated by weight loss test in laboratory,including temperature,H2S partial pressure,CO2 partial pressure and O2 partial pressure,the corrosion mechanism is clarified by analyzing the corrosion products.The results show that the main corrosion products of P110 steel are FeCO3,FeS and Fe2O3.When the temperature is less than 70℃,the corrosion rate increases with the increase of temperature,and reaches the maximum at 70℃,then begins to decrease.With the increase of CO2 and O2 partial pressure,the corrosion rate and H2S partial pressure increased,and the corrosion rate first decreased and then increased.The results show that the effect of oxygen partial pressure and temperature on corrosion rate is higher than that of H2S and CO2.The corrosion law and mechanism are of great significance for ensuring the safety of production and increasing the service life of pipe string.
NETL
NSTL
万方数据
