几种因素对油套管钢CO_2腐蚀行为影响

DYNAMIC CORROSION BEHAVIORS OF N80,P105 AND SM110 STEEL

研究了流动条件下CO2分压、流速、原油含水率、溶液Cl-浓度及pH值对3种油套管常用材料N80、P105和SM110腐蚀行为的影响.90℃、1.5m/s时,随CO2分压升高,材料的腐蚀速率先升后降,在CO2分压为2.5MPa时,除N80钢外,其它材料的腐蚀速率达到最大值;90℃、CO2分压为2.5MPa时,随着流速的增加,腐蚀速率先升后降,在流速为1.5m/s时,材料的腐蚀速率达到最大值;原油含水率对材料的腐蚀速率影响较大;溶液的pH值及Cl-浓度对材料的腐蚀速率影响不明显.

The effect of CO2 partial pressure, flow velocity, water cut, Cl^- concentration and pH of solutions on the corrosion behaviors of N80, P105 and SM110 steel were studied. When the temperature was 90℃ and flow velocity was 1.5m/s, corrosion rate increased early and decreased lately with CO2 partial pressure increasing,when CO2 partial pressure was 2.5MPa, corrosion rates of materials investigated except N80 steel reached maximal value. When the temperature was 90℃ and CO2 partial pressure was 2.5MPa, corrosion rate increased early and decreased lately with flow rate increasing, being maximal at 1.5m/s flow velocity. Water cut sharply influenced the corrosion rate. The effect of pH and Cl^- concentration on the corrosion rate were unobvious.