模拟川东某气田气井封隔器失效后套管面临的腐蚀环境，利用自制高温高压釜进行VM110SS套管钢在总压18 M Pa、CO2分压0．54 M Pa、H2 S分压0．41 M Pa、温度30～150℃条件下的腐蚀实验，得出了该气井工况下温度对VM110SS套管钢腐蚀速率的影响。采用扫描电镜和电子能谱分析方法对试样表面腐蚀产物形貌及成分进行分析。结果表明，VM110SS钢的平均腐蚀速率随温度的升高呈现先增大后减小的规律，气液相腐蚀速率最大值出现在90℃。在90℃气相中腐蚀速率为0．838 m m/a、液相中腐蚀速率为1．130 m m/a ，发生极严重腐蚀。所有实验温度条件下，试样均发生均匀腐蚀，且腐蚀产物以硫铁化合物为主。本实验为酸性气田在不同井深及温度条件下套管的腐蚀状况评估提供了参考。
Variation and degradation of P-110 casing steel mechanical properties, due to sulfide stress cracking （SSC） in sour environments, was investigated using tensile and impact tests. These tests were carried out on specimens, which were pretreated under the following conditions for 168 hours： temperature, 60 ℃; pressure, 10 MPa; H2S partial pressure, 1 MPa and CO2 partial pressure, 1 MPa; preload stress, 80% of the yield strength （os）; medium, simulated formation water. The reduction in tensile and impact strengths for P-110 casing specimens in corrosive environments were 28% and 54%, respectively. The surface morphology analysis indicated that surface damage and uniform plastic deformation occurred as a result of strain aging. Impact toughness of the casing decreased significantly and intergranular cracking occurred when specimens were maintained at a high stress level of 85% %.
